[2/4] media: meson: add v4l2 m2m video decoder driver

Commit Message

Maxime Jourdan Aug. 31, 2018, 8:52 a.m. UTC

Amlogic SoCs feature a powerful video decoder unit able to
decode many formats, with a performance of usually up to 4k60.

This is a driver for this IP that is based around the v4l2 m2m framework.

It features decoding for:
- MPEG 1
- MPEG 2

Supported SoCs are: GXBB (S905), GXL (S905X/W/D), GXM (S912)

There is also a hardware bitstream parser (ESPARSER) that is handled here.

Signed-off-by: Maxime Jourdan <[e-mail]>
---
 drivers/media/platform/Kconfig                |  10 +
 drivers/media/platform/meson/Makefile         |   1 +
 drivers/media/platform/meson/vdec/Makefile    |   8 +
 .../media/platform/meson/vdec/codec_mpeg12.c  | 170 +++
 .../media/platform/meson/vdec/codec_mpeg12.h  |  14 +
 drivers/media/platform/meson/vdec/dos_regs.h  |  98 ++
 drivers/media/platform/meson/vdec/esparser.c  | 368 +++++++
 drivers/media/platform/meson/vdec/esparser.h  |  28 +
 drivers/media/platform/meson/vdec/vdec.c      | 988 ++++++++++++++++++
 drivers/media/platform/meson/vdec/vdec.h      | 234 +++++
 drivers/media/platform/meson/vdec/vdec_1.c    | 228 ++++
 drivers/media/platform/meson/vdec/vdec_1.h    |  14 +
 .../media/platform/meson/vdec/vdec_helpers.c  | 354 +++++++
 .../media/platform/meson/vdec/vdec_helpers.h  |  45 +
 .../media/platform/meson/vdec/vdec_platform.c | 101 ++
 .../media/platform/meson/vdec/vdec_platform.h |  30 +
 16 files changed, 2691 insertions(+)
 create mode 100644 drivers/media/platform/meson/vdec/Makefile
 create mode 100644 drivers/media/platform/meson/vdec/codec_mpeg12.c
 create mode 100644 drivers/media/platform/meson/vdec/codec_mpeg12.h
 create mode 100644 drivers/media/platform/meson/vdec/dos_regs.h
 create mode 100644 drivers/media/platform/meson/vdec/esparser.c
 create mode 100644 drivers/media/platform/meson/vdec/esparser.h
 create mode 100644 drivers/media/platform/meson/vdec/vdec.c
 create mode 100644 drivers/media/platform/meson/vdec/vdec.h
 create mode 100644 drivers/media/platform/meson/vdec/vdec_1.c
 create mode 100644 drivers/media/platform/meson/vdec/vdec_1.h
 create mode 100644 drivers/media/platform/meson/vdec/vdec_helpers.c
 create mode 100644 drivers/media/platform/meson/vdec/vdec_helpers.h
 create mode 100644 drivers/media/platform/meson/vdec/vdec_platform.c
 create mode 100644 drivers/media/platform/meson/vdec/vdec_platform.h

Comments

kernel test robot Aug. 31, 2018, 10:37 p.m. UTC | #1

Hi Maxime,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linuxtv-media/master]
[also build test ERROR on v4.19-rc1 next-20180831]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Maxime-Jourdan/Add-Amlogic-video-decoder-driver/20180901-033653
base:   git://linuxtv.org/media_tree.git master
config: i386-allmodconfig (attached as .config)
compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   In file included from drivers/media/platform/meson/vdec/esparser.h:10:0,
                    from drivers/media/platform/meson/vdec/esparser.c:21:
>> drivers/media/platform/meson/vdec/vdec.h:18:10: fatal error: linux/soc/amlogic/meson-canvas.h: No such file or directory
    #include <linux/soc/amlogic/meson-canvas.h>
             ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   compilation terminated.

vim +18 drivers/media/platform/meson/vdec/vdec.h

    12	
    13	#include <linux/regmap.h>
    14	#include <linux/list.h>
    15	#include <media/videobuf2-v4l2.h>
    16	#include <media/v4l2-ctrls.h>
    17	#include <media/v4l2-device.h>
  > 18	#include <linux/soc/amlogic/meson-canvas.h>
    19	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

Hans Verkuil Sept. 3, 2018, 11:18 a.m. UTC | #2

Hi Maxime,

Thank you for this patch series, nice to see amlogic becoming supported as well!

On 08/31/2018 10:52 AM, Maxime Jourdan wrote:
> Amlogic SoCs feature a powerful video decoder unit able to
> decode many formats, with a performance of usually up to 4k60.
> 
> This is a driver for this IP that is based around the v4l2 m2m framework.
> 
> It features decoding for:
> - MPEG 1
> - MPEG 2
> 
> Supported SoCs are: GXBB (S905), GXL (S905X/W/D), GXM (S912)
> 
> There is also a hardware bitstream parser (ESPARSER) that is handled here.
> 
> Signed-off-by: Maxime Jourdan <[e-mail]>
> ---
>  drivers/media/platform/Kconfig                |  10 +
>  drivers/media/platform/meson/Makefile         |   1 +
>  drivers/media/platform/meson/vdec/Makefile    |   8 +
>  .../media/platform/meson/vdec/codec_mpeg12.c  | 170 +++
>  .../media/platform/meson/vdec/codec_mpeg12.h  |  14 +
>  drivers/media/platform/meson/vdec/dos_regs.h  |  98 ++
>  drivers/media/platform/meson/vdec/esparser.c  | 368 +++++++
>  drivers/media/platform/meson/vdec/esparser.h  |  28 +
>  drivers/media/platform/meson/vdec/vdec.c      | 988 ++++++++++++++++++
>  drivers/media/platform/meson/vdec/vdec.h      | 234 +++++
>  drivers/media/platform/meson/vdec/vdec_1.c    | 228 ++++
>  drivers/media/platform/meson/vdec/vdec_1.h    |  14 +
>  .../media/platform/meson/vdec/vdec_helpers.c  | 354 +++++++
>  .../media/platform/meson/vdec/vdec_helpers.h  |  45 +
>  .../media/platform/meson/vdec/vdec_platform.c | 101 ++
>  .../media/platform/meson/vdec/vdec_platform.h |  30 +

Missing MAINTAINERS file update.

>  16 files changed, 2691 insertions(+)
>  create mode 100644 drivers/media/platform/meson/vdec/Makefile
>  create mode 100644 drivers/media/platform/meson/vdec/codec_mpeg12.c
>  create mode 100644 drivers/media/platform/meson/vdec/codec_mpeg12.h
>  create mode 100644 drivers/media/platform/meson/vdec/dos_regs.h
>  create mode 100644 drivers/media/platform/meson/vdec/esparser.c
>  create mode 100644 drivers/media/platform/meson/vdec/esparser.h
>  create mode 100644 drivers/media/platform/meson/vdec/vdec.c
>  create mode 100644 drivers/media/platform/meson/vdec/vdec.h
>  create mode 100644 drivers/media/platform/meson/vdec/vdec_1.c
>  create mode 100644 drivers/media/platform/meson/vdec/vdec_1.h
>  create mode 100644 drivers/media/platform/meson/vdec/vdec_helpers.c
>  create mode 100644 drivers/media/platform/meson/vdec/vdec_helpers.h
>  create mode 100644 drivers/media/platform/meson/vdec/vdec_platform.c
>  create mode 100644 drivers/media/platform/meson/vdec/vdec_platform.h
> 
> diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
> index 2728376b04b5..1c33d95dd92f 100644
> --- a/drivers/media/platform/Kconfig
> +++ b/drivers/media/platform/Kconfig
> @@ -482,6 +482,16 @@ config VIDEO_QCOM_VENUS
>  	  on various Qualcomm SoCs.
>  	  To compile this driver as a module choose m here.
>  
> +config VIDEO_MESON_VDEC
> +	tristate "Amlogic video decoder driver"
> +	depends on VIDEO_DEV && VIDEO_V4L2 && HAS_DMA
> +	depends on (ARCH_MESON) || COMPILE_TEST

Why is ARCH_MESON between parenthesis?

> +	select VIDEOBUF2_DMA_CONTIG
> +	select V4L2_MEM2MEM_DEV
> +	select MESON_CANVAS
> +	help
> +	Support for the video decoder found in gxbb/gxl/gxm chips.
> +
>  endif # V4L_MEM2MEM_DRIVERS
>  
>  # TI VIDEO PORT Helper Modules
> diff --git a/drivers/media/platform/meson/Makefile b/drivers/media/platform/meson/Makefile
> index 597beb8f34d1..f7c6e1031f25 100644
> --- a/drivers/media/platform/meson/Makefile
> +++ b/drivers/media/platform/meson/Makefile
> @@ -1 +1,2 @@
>  obj-$(CONFIG_VIDEO_MESON_AO_CEC)	+= ao-cec.o
> +obj-$(CONFIG_VIDEO_MESON_VDEC)	+= vdec/
> diff --git a/drivers/media/platform/meson/vdec/Makefile b/drivers/media/platform/meson/vdec/Makefile
> new file mode 100644
> index 000000000000..6bea129084b7
> --- /dev/null
> +++ b/drivers/media/platform/meson/vdec/Makefile
> @@ -0,0 +1,8 @@
> +# SPDX-License-Identifier: GPL-2.0
> +# Makefile for Amlogic meson video decoder driver
> +
> +meson-vdec-objs = esparser.o vdec.o vdec_helpers.o vdec_platform.o
> +meson-vdec-objs += vdec_1.o
> +meson-vdec-objs += codec_mpeg12.o
> +
> +obj-$(CONFIG_VIDEO_MESON_VDEC) += meson-vdec.o
> diff --git a/drivers/media/platform/meson/vdec/codec_mpeg12.c b/drivers/media/platform/meson/vdec/codec_mpeg12.c
> new file mode 100644
> index 000000000000..18709319cff7
> --- /dev/null
> +++ b/drivers/media/platform/meson/vdec/codec_mpeg12.c
> @@ -0,0 +1,170 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2018 BayLibre, SAS
> + * Author: Maxime Jourdan <[e-mail]>
> + */
> +
> +#include <media/v4l2-mem2mem.h>
> +#include <media/videobuf2-dma-contig.h>
> +
> +#include "vdec_helpers.h"
> +#include "dos_regs.h"
> +
> +#define SIZE_WORKSPACE		SZ_128K
> +/* Offset substracted by the firmware from the workspace paddr */
> +#define WORKSPACE_OFFSET	(5 * SZ_1K)
> +
> +/* map firmware registers to known MPEG1/2 functions */
> +#define MREG_SEQ_INFO		AV_SCRATCH_4
> +#define MREG_PIC_INFO		AV_SCRATCH_5
> +#define MREG_PIC_WIDTH		AV_SCRATCH_6
> +#define MREG_PIC_HEIGHT		AV_SCRATCH_7
> +#define MREG_BUFFERIN		AV_SCRATCH_8
> +#define MREG_BUFFEROUT		AV_SCRATCH_9
> +#define MREG_CMD		AV_SCRATCH_A
> +#define MREG_CO_MV_START	AV_SCRATCH_B
> +#define MREG_ERROR_COUNT	AV_SCRATCH_C
> +#define MREG_FRAME_OFFSET	AV_SCRATCH_D
> +#define MREG_WAIT_BUFFER	AV_SCRATCH_E
> +#define MREG_FATAL_ERROR	AV_SCRATCH_F
> +
> +#define PICINFO_PROG		0x00008000
> +#define PICINFO_TOP_FIRST	0x00002000
> +
> +struct codec_mpeg12 {
> +	/* Buffer for the MPEG1/2 Workspace */
> +	void	  *workspace_vaddr;
> +	dma_addr_t workspace_paddr;
> +};
> +
> +static int codec_mpeg12_can_recycle(struct amvdec_core *core)
> +{
> +	return !amvdec_read_dos(core, MREG_BUFFERIN);
> +}
> +
> +static void codec_mpeg12_recycle(struct amvdec_core *core, u32 buf_idx)
> +{
> +	amvdec_write_dos(core, MREG_BUFFERIN, buf_idx + 1);
> +}
> +
> +static int codec_mpeg12_start(struct amvdec_session *sess)
> +{
> +	struct amvdec_core *core = sess->core;
> +	struct codec_mpeg12 *mpeg12 = sess->priv;
> +	int ret;
> +
> +	mpeg12 = kzalloc(sizeof(*mpeg12), GFP_KERNEL);
> +	if (!mpeg12)
> +		return -ENOMEM;
> +
> +	/* Allocate some memory for the MPEG1/2 decoder's state */
> +	mpeg12->workspace_vaddr = dma_alloc_coherent(core->dev, SIZE_WORKSPACE,
> +						     &mpeg12->workspace_paddr,
> +						     GFP_KERNEL);
> +	if (!mpeg12->workspace_vaddr) {
> +		dev_err(core->dev, "Failed to request MPEG 1/2 Workspace\n");
> +		ret = -ENOMEM;
> +		goto free_mpeg12;
> +	}
> +
> +	ret = amvdec_set_canvases(sess, (u32[]){ AV_SCRATCH_0, 0 },
> +					(u32[]){ 8, 0 });
> +	if (ret)
> +		goto free_workspace;
> +
> +	amvdec_write_dos(core, POWER_CTL_VLD, BIT(4));
> +	amvdec_write_dos(core, MREG_CO_MV_START,
> +			 mpeg12->workspace_paddr + WORKSPACE_OFFSET);
> +
> +	amvdec_write_dos(core, MPEG1_2_REG, 0);
> +	amvdec_write_dos(core, PSCALE_CTRL, 0);
> +	amvdec_write_dos(core, PIC_HEAD_INFO, 0x380);
> +	amvdec_write_dos(core, M4_CONTROL_REG, 0);
> +	amvdec_write_dos(core, MREG_BUFFERIN, 0);
> +	amvdec_write_dos(core, MREG_BUFFEROUT, 0);
> +	amvdec_write_dos(core, MREG_CMD, (sess->width << 16) | sess->height);
> +	amvdec_write_dos(core, MREG_ERROR_COUNT, 0);
> +	amvdec_write_dos(core, MREG_FATAL_ERROR, 0);
> +	amvdec_write_dos(core, MREG_WAIT_BUFFER, 0);
> +
> +	sess->keyframe_found = 1;
> +	sess->priv = mpeg12;
> +
> +	return 0;
> +
> +free_workspace:
> +	dma_free_coherent(core->dev, SIZE_WORKSPACE, mpeg12->workspace_vaddr,
> +			  mpeg12->workspace_paddr);
> +free_mpeg12:
> +	kfree(mpeg12);
> +
> +	return ret;
> +}
> +
> +static int codec_mpeg12_stop(struct amvdec_session *sess)
> +{
> +	struct codec_mpeg12 *mpeg12 = sess->priv;
> +	struct amvdec_core *core = sess->core;
> +
> +	if (mpeg12->workspace_vaddr)
> +		dma_free_coherent(core->dev, SIZE_WORKSPACE,
> +				  mpeg12->workspace_vaddr,
> +				  mpeg12->workspace_paddr);
> +
> +	return 0;
> +}
> +
> +static irqreturn_t codec_mpeg12_threaded_isr(struct amvdec_session *sess)
> +{
> +	struct amvdec_core *core = sess->core;
> +	u32 reg;
> +	u32 pic_info;
> +	u32 is_progressive;
> +	u32 buffer_index;
> +	u32 field = V4L2_FIELD_NONE;
> +
> +	amvdec_write_dos(core, ASSIST_MBOX1_CLR_REG, 1);
> +	reg = amvdec_read_dos(core, MREG_FATAL_ERROR);
> +	if (reg == 1) {
> +		dev_err(core->dev, "MPEG1/2 fatal error\n");
> +		amvdec_abort(sess);
> +		return IRQ_HANDLED;
> +	}
> +
> +	reg = amvdec_read_dos(core, MREG_BUFFEROUT);
> +	if (!reg)
> +		return IRQ_HANDLED;
> +
> +	/* Unclear what this means */
> +	if ((reg & GENMASK(23, 17)) == GENMASK(23, 17))
> +		goto end;
> +
> +	pic_info = amvdec_read_dos(core, MREG_PIC_INFO);
> +	is_progressive = pic_info & PICINFO_PROG;
> +
> +	if (!is_progressive)
> +		field = (pic_info & PICINFO_TOP_FIRST) ?
> +			V4L2_FIELD_INTERLACED_TB :
> +			V4L2_FIELD_INTERLACED_BT;
> +
> +	buffer_index = ((reg & 0xf) - 1) & 7;
> +	amvdec_dst_buf_done_idx(sess, buffer_index, field);
> +
> +end:
> +	amvdec_write_dos(core, MREG_BUFFEROUT, 0);
> +	return IRQ_HANDLED;
> +}
> +
> +static irqreturn_t codec_mpeg12_isr(struct amvdec_session *sess)
> +{
> +	return IRQ_WAKE_THREAD;
> +}
> +
> +struct amvdec_codec_ops codec_mpeg12_ops = {
> +	.start = codec_mpeg12_start,
> +	.stop = codec_mpeg12_stop,
> +	.isr = codec_mpeg12_isr,
> +	.threaded_isr = codec_mpeg12_threaded_isr,
> +	.can_recycle = codec_mpeg12_can_recycle,
> +	.recycle = codec_mpeg12_recycle,
> +};
> diff --git a/drivers/media/platform/meson/vdec/codec_mpeg12.h b/drivers/media/platform/meson/vdec/codec_mpeg12.h
> new file mode 100644
> index 000000000000..43cab5f39ca0
> --- /dev/null
> +++ b/drivers/media/platform/meson/vdec/codec_mpeg12.h
> @@ -0,0 +1,14 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * Copyright (C) 2018 BayLibre, SAS
> + * Author: Maxime Jourdan <[e-mail]>
> + */
> +
> +#ifndef __MESON_VDEC_CODEC_MPEG12_H_
> +#define __MESON_VDEC_CODEC_MPEG12_H_
> +
> +#include "vdec.h"
> +
> +extern struct amvdec_codec_ops codec_mpeg12_ops;
> +
> +#endif
> diff --git a/drivers/media/platform/meson/vdec/dos_regs.h b/drivers/media/platform/meson/vdec/dos_regs.h
> new file mode 100644
> index 000000000000..abd810542dbb
> --- /dev/null
> +++ b/drivers/media/platform/meson/vdec/dos_regs.h
> @@ -0,0 +1,98 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * Copyright (C) 2018 BayLibre, SAS
> + * Author: Maxime Jourdan <[e-mail]>
> + */
> +
> +#ifndef __MESON_VDEC_DOS_REGS_H_
> +#define __MESON_VDEC_DOS_REGS_H_
> +
> +/* DOS registers */
> +#define VDEC_ASSIST_AMR1_INT8	0x00b4
> +
> +#define ASSIST_MBOX1_CLR_REG	0x01d4
> +#define ASSIST_MBOX1_MASK	0x01d8
> +
> +#define MPSR			0x0c04
> +#define MCPU_INTR_MSK		0x0c10
> +#define CPSR			0x0c84
> +
> +#define IMEM_DMA_CTRL		0x0d00
> +#define IMEM_DMA_ADR		0x0d04
> +#define IMEM_DMA_COUNT		0x0d08
> +#define LMEM_DMA_CTRL		0x0d40
> +
> +#define MC_STATUS0		0x2424
> +#define MC_CTRL1		0x242c
> +
> +#define PSCALE_RST		0x2440
> +#define PSCALE_CTRL		0x2444
> +#define PSCALE_BMEM_ADDR	0x247c
> +#define PSCALE_BMEM_DAT		0x2480
> +
> +#define DBLK_CTRL		0x2544
> +#define DBLK_STATUS		0x254c
> +
> +#define GCLK_EN			0x260c
> +#define MDEC_PIC_DC_CTRL	0x2638
> +#define MDEC_PIC_DC_STATUS	0x263c
> +#define ANC0_CANVAS_ADDR	0x2640
> +#define MDEC_PIC_DC_THRESH	0x26e0
> +
> +/* Firmware interface registers */
> +#define AV_SCRATCH_0		0x2700
> +#define AV_SCRATCH_1		0x2704
> +#define AV_SCRATCH_2		0x2708
> +#define AV_SCRATCH_3		0x270c
> +#define AV_SCRATCH_4		0x2710
> +#define AV_SCRATCH_5		0x2714
> +#define AV_SCRATCH_6		0x2718
> +#define AV_SCRATCH_7		0x271c
> +#define AV_SCRATCH_8		0x2720
> +#define AV_SCRATCH_9		0x2724
> +#define AV_SCRATCH_A		0x2728
> +#define AV_SCRATCH_B		0x272c
> +#define AV_SCRATCH_C		0x2730
> +#define AV_SCRATCH_D		0x2734
> +#define AV_SCRATCH_E		0x2738
> +#define AV_SCRATCH_F		0x273c
> +#define AV_SCRATCH_G		0x2740
> +#define AV_SCRATCH_H		0x2744
> +#define AV_SCRATCH_I		0x2748
> +#define AV_SCRATCH_J		0x274c
> +#define AV_SCRATCH_K		0x2750
> +#define AV_SCRATCH_L		0x2754
> +
> +#define MPEG1_2_REG		0x3004
> +#define PIC_HEAD_INFO		0x300c
> +#define POWER_CTL_VLD		0x3020
> +#define M4_CONTROL_REG		0x30a4
> +
> +/* Stream Buffer (stbuf) regs */
> +#define VLD_MEM_VIFIFO_START_PTR	0x3100
> +#define VLD_MEM_VIFIFO_CURR_PTR	0x3104
> +#define VLD_MEM_VIFIFO_END_PTR	0x3108
> +#define VLD_MEM_VIFIFO_CONTROL	0x3110
> +	#define MEM_FIFO_CNT_BIT	16
> +	#define MEM_FILL_ON_LEVEL	BIT(10)
> +	#define MEM_CTRL_EMPTY_EN	BIT(2)
> +	#define MEM_CTRL_FILL_EN	BIT(1)
> +#define VLD_MEM_VIFIFO_WP	0x3114
> +#define VLD_MEM_VIFIFO_RP	0x3118
> +#define VLD_MEM_VIFIFO_LEVEL	0x311c
> +#define VLD_MEM_VIFIFO_BUF_CNTL	0x3120
> +	#define MEM_BUFCTRL_MANUAL	BIT(1)
> +#define VLD_MEM_VIFIFO_WRAP_COUNT	0x3144
> +
> +#define DCAC_DMA_CTRL		0x3848
> +
> +#define DOS_SW_RESET0		0xfc00
> +#define DOS_GCLK_EN0		0xfc04
> +#define DOS_GEN_CTRL0		0xfc08
> +#define DOS_MEM_PD_VDEC		0xfcc0
> +#define DOS_MEM_PD_HEVC		0xfccc
> +#define DOS_SW_RESET3		0xfcd0
> +#define DOS_GCLK_EN3		0xfcd4
> +#define DOS_VDEC_MCRCC_STALL_CTRL	0xfd00
> +
> +#endif
> diff --git a/drivers/media/platform/meson/vdec/esparser.c b/drivers/media/platform/meson/vdec/esparser.c
> new file mode 100644
> index 000000000000..098c7d76ad3f
> --- /dev/null
> +++ b/drivers/media/platform/meson/vdec/esparser.c
> @@ -0,0 +1,368 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2018 BayLibre, SAS
> + * Author: Maxime Jourdan <[e-mail]>
> + *
> + * The Elementary Stream Parser is a HW bitstream parser.
> + * It reads bitstream buffers and feeds them to the VIFIFO
> + */
> +
> +#include <linux/init.h>
> +#include <linux/ioctl.h>
> +#include <linux/list.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +#include <linux/platform_device.h>
> +#include <linux/reset.h>
> +#include <media/videobuf2-dma-contig.h>
> +#include <media/v4l2-mem2mem.h>
> +
> +#include "dos_regs.h"
> +#include "esparser.h"
> +#include "vdec_helpers.h"
> +
> +/* PARSER REGS (CBUS) */
> +#define PARSER_CONTROL 0x00
> +	#define ES_PACK_SIZE_BIT	8
> +	#define ES_WRITE		BIT(5)
> +	#define ES_SEARCH		BIT(1)
> +	#define ES_PARSER_START		BIT(0)
> +#define PARSER_FETCH_ADDR	0x4
> +#define PARSER_FETCH_CMD	0x8
> +#define PARSER_CONFIG 0x14
> +	#define PS_CFG_MAX_FETCH_CYCLE_BIT	0
> +	#define PS_CFG_STARTCODE_WID_24_BIT	10
> +	#define PS_CFG_MAX_ES_WR_CYCLE_BIT	12
> +	#define PS_CFG_PFIFO_EMPTY_CNT_BIT	16
> +#define PFIFO_WR_PTR 0x18
> +#define PFIFO_RD_PTR 0x1c
> +#define PARSER_SEARCH_PATTERN 0x24
> +	#define ES_START_CODE_PATTERN 0x00000100
> +#define PARSER_SEARCH_MASK 0x28
> +	#define ES_START_CODE_MASK	0xffffff00
> +	#define FETCH_ENDIAN_BIT	27
> +#define PARSER_INT_ENABLE	0x2c
> +	#define PARSER_INT_HOST_EN_BIT	8
> +#define PARSER_INT_STATUS	0x30
> +	#define PARSER_INTSTAT_SC_FOUND	1
> +#define PARSER_ES_CONTROL	0x5c
> +#define PARSER_VIDEO_START_PTR	0x80
> +#define PARSER_VIDEO_END_PTR	0x84
> +#define PARSER_VIDEO_HOLE	0x90
> +
> +#define SEARCH_PATTERN_LEN	512
> +#define MIN_PACKET_SIZE		(4 * SZ_1K)
> +
> +/* Buffer to send to the ESPARSER to signal End Of Stream.
> + * Credits to Endless Mobile.
> + */
> +#define EOS_TAIL_BUF_SIZE 1024
> +static const u8 eos_tail_data[EOS_TAIL_BUF_SIZE] = {
> +	0x00, 0x00, 0x00, 0x01, 0x06, 0x05, 0xff, 0xe4, 0xdc, 0x45, 0xe9, 0xbd,
> +	0xe6, 0xd9, 0x48, 0xb7,	0x96, 0x2c, 0xd8, 0x20, 0xd9, 0x23, 0xee, 0xef,
> +	0x78, 0x32, 0x36, 0x34, 0x20, 0x2d, 0x20, 0x63,	0x6f, 0x72, 0x65, 0x20,
> +	0x36, 0x37, 0x20, 0x72, 0x31, 0x31, 0x33, 0x30, 0x20, 0x38, 0x34, 0x37,
> +	0x35, 0x39, 0x37, 0x37, 0x20, 0x2d, 0x20, 0x48, 0x2e, 0x32, 0x36, 0x34,
> +	0x2f, 0x4d, 0x50, 0x45,	0x47, 0x2d, 0x34, 0x20, 0x41, 0x56, 0x43, 0x20,
> +	0x63, 0x6f, 0x64, 0x65, 0x63, 0x20, 0x2d, 0x20,	0x43, 0x6f, 0x70, 0x79,
> +	0x6c, 0x65, 0x66, 0x74, 0x20, 0x32, 0x30, 0x30, 0x33, 0x2d, 0x32, 0x30,
> +	0x30, 0x39, 0x20, 0x2d, 0x20, 0x68, 0x74, 0x74, 0x70, 0x3a, 0x2f, 0x2f,
> +	0x77, 0x77, 0x77, 0x2e,	0x76, 0x69, 0x64, 0x65, 0x6f, 0x6c, 0x61, 0x6e,
> +	0x2e, 0x6f, 0x72, 0x67, 0x2f, 0x78, 0x32, 0x36,	0x34, 0x2e, 0x68, 0x74,
> +	0x6d, 0x6c, 0x20, 0x2d, 0x20, 0x6f, 0x70, 0x74, 0x69, 0x6f, 0x6e, 0x73,
> +	0x3a, 0x20, 0x63, 0x61, 0x62, 0x61, 0x63, 0x3d, 0x31, 0x20, 0x72, 0x65,
> +	0x66, 0x3d, 0x31, 0x20,	0x64, 0x65, 0x62, 0x6c, 0x6f, 0x63, 0x6b, 0x3d,
> +	0x31, 0x3a, 0x30, 0x3a, 0x30, 0x20, 0x61, 0x6e,	0x61, 0x6c, 0x79, 0x73,
> +	0x65, 0x3d, 0x30, 0x78, 0x31, 0x3a, 0x30, 0x78, 0x31, 0x31, 0x31, 0x20,
> +	0x6d, 0x65, 0x3d, 0x68, 0x65, 0x78, 0x20, 0x73, 0x75, 0x62, 0x6d, 0x65,
> +	0x3d, 0x36, 0x20, 0x70,	0x73, 0x79, 0x5f, 0x72, 0x64, 0x3d, 0x31, 0x2e,
> +	0x30, 0x3a, 0x30, 0x2e, 0x30, 0x20, 0x6d, 0x69,	0x78, 0x65, 0x64, 0x5f,
> +	0x72, 0x65, 0x66, 0x3d, 0x30, 0x20, 0x6d, 0x65, 0x5f, 0x72, 0x61, 0x6e,
> +	0x67, 0x65, 0x3d, 0x31, 0x36, 0x20, 0x63, 0x68, 0x72, 0x6f, 0x6d, 0x61,
> +	0x5f, 0x6d, 0x65, 0x3d,	0x31, 0x20, 0x74, 0x72, 0x65, 0x6c, 0x6c, 0x69,
> +	0x73, 0x3d, 0x30, 0x20, 0x38, 0x78, 0x38, 0x64,	0x63, 0x74, 0x3d, 0x30,
> +	0x20, 0x63, 0x71, 0x6d, 0x3d, 0x30, 0x20, 0x64, 0x65, 0x61, 0x64, 0x7a,
> +	0x6f, 0x6e, 0x65, 0x3d, 0x32, 0x31, 0x2c, 0x31, 0x31, 0x20, 0x63, 0x68,
> +	0x72, 0x6f, 0x6d, 0x61,	0x5f, 0x71, 0x70, 0x5f, 0x6f, 0x66, 0x66, 0x73,
> +	0x65, 0x74, 0x3d, 0x2d, 0x32, 0x20, 0x74, 0x68,	0x72, 0x65, 0x61, 0x64,
> +	0x73, 0x3d, 0x31, 0x20, 0x6e, 0x72, 0x3d, 0x30, 0x20, 0x64, 0x65, 0x63,
> +	0x69, 0x6d, 0x61, 0x74, 0x65, 0x3d, 0x31, 0x20, 0x6d, 0x62, 0x61, 0x66,
> +	0x66, 0x3d, 0x30, 0x20,	0x62, 0x66, 0x72, 0x61, 0x6d, 0x65, 0x73, 0x3d,
> +	0x30, 0x20, 0x6b, 0x65, 0x79, 0x69, 0x6e, 0x74,	0x3d, 0x32, 0x35, 0x30,
> +	0x20, 0x6b, 0x65, 0x79, 0x69, 0x6e, 0x74, 0x5f, 0x6d, 0x69, 0x6e, 0x3d,
> +	0x32, 0x35, 0x20, 0x73, 0x63, 0x65, 0x6e, 0x65, 0x63, 0x75, 0x74, 0x3d,
> +	0x34, 0x30, 0x20, 0x72,	0x63, 0x3d, 0x61, 0x62, 0x72, 0x20, 0x62, 0x69,
> +	0x74, 0x72, 0x61, 0x74, 0x65, 0x3d, 0x31, 0x30,	0x20, 0x72, 0x61, 0x74,
> +	0x65, 0x74, 0x6f, 0x6c, 0x3d, 0x31, 0x2e, 0x30, 0x20, 0x71, 0x63, 0x6f,
> +	0x6d, 0x70, 0x3d, 0x30, 0x2e, 0x36, 0x30, 0x20, 0x71, 0x70, 0x6d, 0x69,
> +	0x6e, 0x3d, 0x31, 0x30,	0x20, 0x71, 0x70, 0x6d, 0x61, 0x78, 0x3d, 0x35,
> +	0x31, 0x20, 0x71, 0x70, 0x73, 0x74, 0x65, 0x70,	0x3d, 0x34, 0x20, 0x69,
> +	0x70, 0x5f, 0x72, 0x61, 0x74, 0x69, 0x6f, 0x3d, 0x31, 0x2e, 0x34, 0x30,
> +	0x20, 0x61, 0x71, 0x3d, 0x31, 0x3a, 0x31, 0x2e, 0x30, 0x30, 0x00, 0x80,
> +	0x00, 0x00, 0x00, 0x01,	0x67, 0x4d, 0x40, 0x0a, 0x9a, 0x74, 0xf4, 0x20,
> +	0x00, 0x00, 0x03, 0x00, 0x20, 0x00, 0x00, 0x06,	0x51, 0xe2, 0x44, 0xd4,
> +	0x00, 0x00, 0x00, 0x01, 0x68, 0xee, 0x32, 0xc8, 0x00, 0x00, 0x00, 0x01,
> +	0x65, 0x88, 0x80, 0x20, 0x00, 0x08, 0x7f, 0xea, 0x6a, 0xe2, 0x99, 0xb6,
> +	0x57, 0xae, 0x49, 0x30,	0xf5, 0xfe, 0x5e, 0x46, 0x0b, 0x72, 0x44, 0xc4,
> +	0xe1, 0xfc, 0x62, 0xda, 0xf1, 0xfb, 0xa2, 0xdb,	0xd6, 0xbe, 0x5c, 0xd7,
> +	0x24, 0xa3, 0xf5, 0xb9, 0x2f, 0x57, 0x16, 0x49, 0x75, 0x47, 0x77, 0x09,
> +	0x5c, 0xa1, 0xb4, 0xc3, 0x4f, 0x60, 0x2b, 0xb0, 0x0c, 0xc8, 0xd6, 0x66,
> +	0xba, 0x9b, 0x82, 0x29,	0x33, 0x92, 0x26, 0x99, 0x31, 0x1c, 0x7f, 0x9b
> +};
> +
> +static DECLARE_WAIT_QUEUE_HEAD(wq);
> +static int search_done;
> +
> +static irqreturn_t esparser_isr(int irq, void *dev)
> +{
> +	int int_status;
> +	struct amvdec_core *core = dev;
> +
> +	int_status = amvdec_read_parser(core, PARSER_INT_STATUS);
> +	amvdec_write_parser(core, PARSER_INT_STATUS, int_status);
> +
> +	if (int_status & PARSER_INTSTAT_SC_FOUND) {
> +		amvdec_write_parser(core, PFIFO_RD_PTR, 0);
> +		amvdec_write_parser(core, PFIFO_WR_PTR, 0);
> +		search_done = 1;
> +		wake_up_interruptible(&wq);
> +	}
> +
> +	return IRQ_HANDLED;
> +}
> +
> +/* Pad the packet to at least 4KiB bytes otherwise the VDEC unit won't trigger
> + * ISRs.
> + * Also append a start code 000001ff at the end to trigger
> + * the ESPARSER interrupt.
> + */
> +static u32 esparser_pad_start_code(struct vb2_buffer *vb)
> +{
> +	u32 payload_size = vb2_get_plane_payload(vb, 0);
> +	u32 pad_size = 0;
> +	u8 *vaddr = vb2_plane_vaddr(vb, 0) + payload_size;
> +
> +	if (payload_size < MIN_PACKET_SIZE) {
> +		pad_size = MIN_PACKET_SIZE - payload_size;
> +		memset(vaddr, 0, pad_size);
> +	}
> +
> +	memset(vaddr + pad_size, 0, SEARCH_PATTERN_LEN);
> +	vaddr[pad_size]     = 0x00;
> +	vaddr[pad_size + 1] = 0x00;
> +	vaddr[pad_size + 2] = 0x01;
> +	vaddr[pad_size + 3] = 0xff;
> +
> +	return pad_size;
> +}
> +
> +static int
> +esparser_write_data(struct amvdec_core *core, dma_addr_t addr, u32 size)
> +{
> +	amvdec_write_parser(core, PFIFO_RD_PTR, 0);
> +	amvdec_write_parser(core, PFIFO_WR_PTR, 0);
> +	amvdec_write_parser(core, PARSER_CONTROL,
> +			    ES_WRITE |
> +			    ES_PARSER_START |
> +			    ES_SEARCH |
> +			    (size << ES_PACK_SIZE_BIT));
> +
> +	amvdec_write_parser(core, PARSER_FETCH_ADDR, addr);
> +	amvdec_write_parser(core, PARSER_FETCH_CMD,
> +			    (7 << FETCH_ENDIAN_BIT) |
> +			    (size + SEARCH_PATTERN_LEN));
> +
> +	search_done = 0;
> +	return wait_event_interruptible_timeout(wq, search_done, (HZ / 5));
> +}
> +
> +static u32 esparser_vififo_get_free_space(struct amvdec_session *sess)
> +{
> +	u32 vififo_usage;
> +	struct amvdec_ops *vdec_ops = sess->fmt_out->vdec_ops;
> +	struct amvdec_core *core = sess->core;
> +
> +	vififo_usage  = vdec_ops->vififo_level(sess);
> +	vififo_usage += amvdec_read_parser(core, PARSER_VIDEO_HOLE);
> +	vififo_usage += (6 * SZ_1K);
> +
> +	if (vififo_usage > sess->vififo_size) {
> +		dev_warn(sess->core->dev,
> +			 "VIFIFO usage (%u) > VIFIFO size (%u)\n",
> +			 vififo_usage, sess->vififo_size);
> +		return 0;
> +	}
> +
> +	return sess->vififo_size - vififo_usage;
> +}
> +
> +int esparser_queue_eos(struct amvdec_core *core)
> +{
> +	struct device *dev = core->dev;
> +	void *eos_vaddr;
> +	dma_addr_t eos_paddr;
> +	int ret;
> +
> +	eos_vaddr = dma_alloc_coherent(dev,
> +				       EOS_TAIL_BUF_SIZE + SEARCH_PATTERN_LEN,
> +				       &eos_paddr, GFP_KERNEL);
> +	if (!eos_vaddr)
> +		return -ENOMEM;
> +
> +	memset(eos_vaddr, 0, EOS_TAIL_BUF_SIZE + SEARCH_PATTERN_LEN);
> +	memcpy(eos_vaddr, eos_tail_data, sizeof(eos_tail_data));
> +	ret = esparser_write_data(core, eos_paddr, EOS_TAIL_BUF_SIZE);
> +	dma_free_coherent(dev, EOS_TAIL_BUF_SIZE + SEARCH_PATTERN_LEN,
> +			  eos_vaddr, eos_paddr);
> +
> +	return ret;
> +}
> +
> +static int
> +esparser_queue(struct amvdec_session *sess, struct vb2_v4l2_buffer *vbuf)
> +{
> +	int ret;
> +	struct vb2_buffer *vb = &vbuf->vb2_buf;
> +	struct amvdec_core *core = sess->core;
> +	struct amvdec_codec_ops *codec_ops = sess->fmt_out->codec_ops;
> +	u32 num_dst_bufs = 0;
> +	u32 payload_size = vb2_get_plane_payload(vb, 0);
> +	dma_addr_t phy = vb2_dma_contig_plane_dma_addr(vb, 0);
> +	u32 pad_size;
> +
> +	if (!payload_size) {
> +		esparser_queue_eos(core);
> +		return 0;
> +	}
> +
> +	if (codec_ops->num_pending_bufs)
> +		num_dst_bufs = codec_ops->num_pending_bufs(sess);
> +
> +	num_dst_bufs += v4l2_m2m_num_dst_bufs_ready(sess->m2m_ctx);
> +
> +	if (esparser_vififo_get_free_space(sess) < payload_size ||
> +	    atomic_read(&sess->esparser_queued_bufs) >= num_dst_bufs)
> +		return -EAGAIN;
> +
> +	v4l2_m2m_src_buf_remove_by_buf(sess->m2m_ctx, vbuf);
> +	amvdec_add_ts_reorder(sess, vb->timestamp);
> +	dev_dbg(core->dev, "esparser: Queuing ts = %llu ; pld_size = %u\n",
> +		vb->timestamp, payload_size);
> +
> +	pad_size = esparser_pad_start_code(vb);
> +	ret = esparser_write_data(core, phy, payload_size + pad_size);
> +
> +	if (ret > 0) {
> +		/* We need to wait until we parse/decode the first keyframe.
> +		 * All buffers prior to the first keyframe must be dropped.
> +		 */
> +		if (!sess->keyframe_found)
> +			usleep_range(1000, 2000);
> +
> +		if (sess->keyframe_found)
> +			atomic_inc(&sess->esparser_queued_bufs);
> +		else
> +			amvdec_remove_ts(sess, vb->timestamp);
> +
> +		vbuf->flags = 0;
> +		vbuf->field = V4L2_FIELD_NONE;
> +		v4l2_m2m_buf_done(vbuf, VB2_BUF_STATE_DONE);
> +		return 0;
> +	}
> +
> +	dev_warn(core->dev, "esparser: input parsing error\n");
> +	amvdec_remove_ts(sess, vb->timestamp);
> +	v4l2_m2m_buf_done(vbuf, VB2_BUF_STATE_ERROR);
> +	amvdec_write_parser(core, PARSER_FETCH_CMD, 0);
> +
> +	return 0;
> +}
> +
> +void esparser_queue_all_src(struct work_struct *work)
> +{
> +	struct v4l2_m2m_buffer *buf, *n;
> +	struct amvdec_session *sess =
> +		container_of(work, struct amvdec_session, esparser_queue_work);
> +
> +	mutex_lock(&sess->lock);
> +	v4l2_m2m_for_each_src_buf_safe(sess->m2m_ctx, buf, n) {
> +		if (esparser_queue(sess, &buf->vb) < 0)
> +			break;
> +
> +		/* Some codecs don't like having data queued in too fast */

This needs some more extensive explanation. Which codecs? Why is this is
problem? Why is 1 ms delay sufficient?

It's weird and unexpected, so that needs better documentation.

> +		usleep_range(1000, 2000);
> +	}
> +	mutex_unlock(&sess->lock);
> +}
> +
> +int esparser_power_up(struct amvdec_session *sess)
> +{
> +	struct amvdec_core *core = sess->core;
> +	struct amvdec_ops *vdec_ops = sess->fmt_out->vdec_ops;
> +
> +	reset_control_reset(core->esparser_reset);
> +	amvdec_write_parser(core, PARSER_CONFIG,
> +			    (10 << PS_CFG_PFIFO_EMPTY_CNT_BIT) |
> +			    (1  << PS_CFG_MAX_ES_WR_CYCLE_BIT) |
> +			    (16 << PS_CFG_MAX_FETCH_CYCLE_BIT));
> +
> +	amvdec_write_parser(core, PFIFO_RD_PTR, 0);
> +	amvdec_write_parser(core, PFIFO_WR_PTR, 0);
> +
> +	amvdec_write_parser(core, PARSER_SEARCH_PATTERN,
> +			    ES_START_CODE_PATTERN);
> +	amvdec_write_parser(core, PARSER_SEARCH_MASK, ES_START_CODE_MASK);
> +
> +	amvdec_write_parser(core, PARSER_CONFIG,
> +			    (10 << PS_CFG_PFIFO_EMPTY_CNT_BIT) |
> +			    (1  << PS_CFG_MAX_ES_WR_CYCLE_BIT) |
> +			    (16 << PS_CFG_MAX_FETCH_CYCLE_BIT) |
> +			    (2  << PS_CFG_STARTCODE_WID_24_BIT));
> +
> +	amvdec_write_parser(core, PARSER_CONTROL,
> +			    (ES_SEARCH | ES_PARSER_START));
> +
> +	amvdec_write_parser(core, PARSER_VIDEO_START_PTR, sess->vififo_paddr);
> +	amvdec_write_parser(core, PARSER_VIDEO_END_PTR,
> +			    sess->vififo_paddr + sess->vififo_size - 8);
> +	amvdec_write_parser(core, PARSER_ES_CONTROL,
> +			    amvdec_read_parser(core, PARSER_ES_CONTROL) & ~1);
> +
> +	if (vdec_ops->conf_esparser)
> +		vdec_ops->conf_esparser(sess);
> +
> +	amvdec_write_parser(core, PARSER_INT_STATUS, 0xffff);
> +	amvdec_write_parser(core, PARSER_INT_ENABLE,
> +			    BIT(PARSER_INT_HOST_EN_BIT));
> +
> +	return 0;
> +}
> +
> +int esparser_init(struct platform_device *pdev, struct amvdec_core *core)
> +{
> +	struct device *dev = &pdev->dev;
> +	int ret;
> +	int irq;
> +
> +	irq = platform_get_irq(pdev, 1);
> +	if (irq < 0) {
> +		dev_err(dev, "Failed getting ESPARSER IRQ from dtb\n");
> +		return irq;
> +	}
> +
> +	ret = devm_request_irq(dev, irq, esparser_isr, IRQF_SHARED,
> +			       "esparserirq", core);
> +	if (ret) {
> +		dev_err(dev, "Failed requesting ESPARSER IRQ\n");
> +		return ret;
> +	}
> +
> +	core->esparser_reset =
> +		devm_reset_control_get_exclusive(dev, "esparser");
> +	if (IS_ERR(core->esparser_reset)) {
> +		dev_err(dev, "Failed to get esparser_reset\n");
> +		return PTR_ERR(core->esparser_reset);
> +	}
> +
> +	return 0;
> +}
> diff --git a/drivers/media/platform/meson/vdec/esparser.h b/drivers/media/platform/meson/vdec/esparser.h
> new file mode 100644
> index 000000000000..22c2ac5c6d35
> --- /dev/null
> +++ b/drivers/media/platform/meson/vdec/esparser.h
> @@ -0,0 +1,28 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * Copyright (C) 2018 BayLibre, SAS
> + * Author: Maxime Jourdan <[e-mail]>
> + */
> +
> +#ifndef __MESON_VDEC_ESPARSER_H_
> +#define __MESON_VDEC_ESPARSER_H_
> +
> +#include "vdec.h"
> +
> +int esparser_init(struct platform_device *pdev, struct amvdec_core *core);
> +int esparser_power_up(struct amvdec_session *sess);
> +
> +/**
> + * esparser_queue_eos() - write End Of Stream sequence to the ESPARSER
> + *
> + * @core vdec core struct
> + */
> +int esparser_queue_eos(struct amvdec_core *core);
> +
> +/**
> + * esparser_queue_all_src() - work handler that writes as many src buffers
> + * as possible to the ESPARSER
> + */
> +void esparser_queue_all_src(struct work_struct *work);
> +
> +#endif
> diff --git a/drivers/media/platform/meson/vdec/vdec.c b/drivers/media/platform/meson/vdec/vdec.c
> new file mode 100644
> index 000000000000..32e1e2228297
> --- /dev/null
> +++ b/drivers/media/platform/meson/vdec/vdec.c
> @@ -0,0 +1,988 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2018 BayLibre, SAS
> + * Author: Maxime Jourdan <[e-mail]>
> + */
> +
> +#include <linux/of_device.h>
> +#include <linux/clk.h>
> +#include <linux/io.h>
> +#include <linux/module.h>
> +#include <linux/platform_device.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/slab.h>
> +#include <media/v4l2-ioctl.h>
> +#include <media/v4l2-event.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-mem2mem.h>
> +#include <media/v4l2-dev.h>
> +#include <media/videobuf2-dma-contig.h>
> +
> +#include "vdec.h"
> +#include "esparser.h"
> +#include "vdec_helpers.h"
> +
> +struct dummy_buf {
> +	struct vb2_v4l2_buffer vb;
> +	struct list_head list;
> +};
> +
> +/* 16 MiB for parsed bitstream swap exchange */
> +#define SIZE_VIFIFO SZ_16M
> +
> +static u32 get_output_size(u32 width, u32 height)
> +{
> +	return ALIGN(width * height, SZ_64K);
> +}
> +
> +u32 amvdec_get_output_size(struct amvdec_session *sess)
> +{
> +	return get_output_size(sess->width, sess->height);
> +}
> +EXPORT_SYMBOL_GPL(amvdec_get_output_size);
> +
> +static int vdec_codec_needs_recycle(struct amvdec_session *sess)
> +{
> +	struct amvdec_codec_ops *codec_ops = sess->fmt_out->codec_ops;
> +
> +	return codec_ops->can_recycle && codec_ops->recycle;
> +}
> +
> +static int vdec_recycle_thread(void *data)
> +{
> +	struct amvdec_session *sess = data;
> +	struct amvdec_core *core = sess->core;
> +	struct amvdec_codec_ops *codec_ops = sess->fmt_out->codec_ops;
> +	struct amvdec_buffer *tmp, *n;
> +
> +	while (!kthread_should_stop()) {
> +		mutex_lock(&sess->bufs_recycle_lock);
> +		list_for_each_entry_safe(tmp, n, &sess->bufs_recycle, list) {
> +			if (!codec_ops->can_recycle(core))
> +				break;
> +
> +			codec_ops->recycle(core, tmp->vb->index);
> +			dev_dbg(core->dev, "Buffer %d recycled\n",
> +				tmp->vb->index);
> +			list_del(&tmp->list);
> +			kfree(tmp);
> +		}
> +		mutex_unlock(&sess->bufs_recycle_lock);
> +
> +		usleep_range(5000, 10000);
> +	}
> +
> +	return 0;
> +}
> +
> +static int vdec_poweron(struct amvdec_session *sess)
> +{
> +	int ret;
> +	struct amvdec_ops *vdec_ops = sess->fmt_out->vdec_ops;
> +
> +	ret = clk_prepare_enable(sess->core->dos_parser_clk);
> +	if (ret)
> +		return ret;
> +
> +	ret = clk_prepare_enable(sess->core->dos_clk);
> +	if (ret)
> +		goto disable_dos_parser;
> +
> +	ret = vdec_ops->start(sess);
> +	if (ret)
> +		goto disable_dos;
> +
> +	esparser_power_up(sess);
> +
> +	return 0;
> +
> +disable_dos:
> +	clk_disable_unprepare(sess->core->dos_clk);
> +disable_dos_parser:
> +	clk_disable_unprepare(sess->core->dos_parser_clk);
> +
> +	return ret;
> +}
> +
> +static void vdec_wait_inactive(struct amvdec_session *sess)
> +{
> +	/* We consider 50ms with no IRQ to be inactive. */
> +	while (time_is_after_jiffies64(sess->last_irq_jiffies +
> +				       msecs_to_jiffies(50)))
> +		msleep(25);
> +}
> +
> +static void vdec_poweroff(struct amvdec_session *sess)
> +{
> +	struct amvdec_ops *vdec_ops = sess->fmt_out->vdec_ops;
> +	struct amvdec_codec_ops *codec_ops = sess->fmt_out->codec_ops;
> +
> +	vdec_wait_inactive(sess);
> +	if (codec_ops->drain)
> +		codec_ops->drain(sess);
> +
> +	vdec_ops->stop(sess);
> +	clk_disable_unprepare(sess->core->dos_clk);
> +	clk_disable_unprepare(sess->core->dos_parser_clk);
> +}
> +
> +static void
> +vdec_queue_recycle(struct amvdec_session *sess, struct vb2_buffer *vb)
> +{
> +	struct amvdec_buffer *new_buf;
> +
> +	new_buf = kmalloc(sizeof(*new_buf), GFP_KERNEL);
> +	new_buf->vb = vb;
> +
> +	mutex_lock(&sess->bufs_recycle_lock);
> +	list_add_tail(&new_buf->list, &sess->bufs_recycle);
> +	mutex_unlock(&sess->bufs_recycle_lock);
> +}
> +
> +static void vdec_m2m_device_run(void *priv)
> +{
> +	struct amvdec_session *sess = priv;
> +
> +	schedule_work(&sess->esparser_queue_work);
> +}
> +
> +static void vdec_m2m_job_abort(void *priv)
> +{
> +	struct amvdec_session *sess = priv;
> +
> +	v4l2_m2m_job_finish(sess->m2m_dev, sess->m2m_ctx);
> +}
> +
> +static const struct v4l2_m2m_ops vdec_m2m_ops = {
> +	.device_run = vdec_m2m_device_run,
> +	.job_abort = vdec_m2m_job_abort,
> +};
> +
> +static int vdec_queue_setup(struct vb2_queue *q,
> +		unsigned int *num_buffers, unsigned int *num_planes,
> +		unsigned int sizes[], struct device *alloc_devs[])
> +{
> +	struct amvdec_session *sess = vb2_get_drv_priv(q);
> +	struct amvdec_core *core = sess->core;
> +	const struct amvdec_format *fmt_out = sess->fmt_out;
> +	u32 pixfmt_cap = sess->pixfmt_cap;
> +
> +	switch (q->type) {
> +	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
> +		sizes[0] = amvdec_get_output_size(sess);
> +		*num_planes = 1;
> +		break;
> +	case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
> +		if (pixfmt_cap == V4L2_PIX_FMT_NV12M) {
> +			sizes[0] = amvdec_get_output_size(sess);
> +			sizes[1] = amvdec_get_output_size(sess) / 2;
> +			*num_planes = 2;
> +		} else if (pixfmt_cap == V4L2_PIX_FMT_YUV420M) {
> +			sizes[0] = amvdec_get_output_size(sess);
> +			sizes[1] = amvdec_get_output_size(sess) / 4;
> +			sizes[2] = amvdec_get_output_size(sess) / 4;
> +			*num_planes = 3;
> +		}
> +		*num_buffers = min(max(*num_buffers, fmt_out->min_buffers),
> +				   fmt_out->max_buffers);
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	mutex_lock(&core->lock);
> +	if (core->cur_sess && core->cur_sess != sess) {
> +		mutex_unlock(&core->lock);
> +		return -EBUSY;
> +	}
> +
> +	core->cur_sess = sess;
> +	mutex_unlock(&core->lock);
> +
> +	return 0;
> +}
> +
> +static void vdec_vb2_buf_queue(struct vb2_buffer *vb)
> +{
> +	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
> +	struct amvdec_session *sess = vb2_get_drv_priv(vb->vb2_queue);
> +	struct v4l2_m2m_ctx *m2m_ctx = sess->m2m_ctx;
> +
> +	mutex_lock(&sess->lock);
> +	v4l2_m2m_buf_queue(m2m_ctx, vbuf);
> +
> +	if (!sess->streamon_out || !sess->streamon_cap)
> +		goto unlock;
> +
> +	if (vb->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE &&
> +	    vdec_codec_needs_recycle(sess))
> +		vdec_queue_recycle(sess, vb);
> +
> +	schedule_work(&sess->esparser_queue_work);
> +unlock:
> +	mutex_unlock(&sess->lock);
> +}
> +
> +static int vdec_start_streaming(struct vb2_queue *q, unsigned int count)
> +{
> +	struct amvdec_session *sess = vb2_get_drv_priv(q);
> +	struct vb2_v4l2_buffer *buf;
> +	int ret;
> +
> +	mutex_lock(&sess->lock);
> +
> +	if (q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
> +		sess->streamon_out = 1;
> +	else
> +		sess->streamon_cap = 1;
> +
> +	if (!sess->streamon_out || !sess->streamon_cap) {
> +		mutex_unlock(&sess->lock);
> +		return 0;
> +	}
> +
> +	sess->vififo_size = SIZE_VIFIFO;
> +	sess->vififo_vaddr =
> +		dma_alloc_coherent(sess->core->dev, sess->vififo_size,
> +				   &sess->vififo_paddr, GFP_KERNEL);
> +	if (!sess->vififo_vaddr) {
> +		dev_err(sess->core->dev, "Failed to request VIFIFO buffer\n");
> +		ret = -ENOMEM;
> +		goto bufs_done;
> +	}
> +
> +	sess->should_stop = 0;
> +	sess->keyframe_found = 0;
> +	atomic_set(&sess->esparser_queued_bufs, 0);
> +	ret = vdec_poweron(sess);
> +	if (ret)
> +		goto vififo_free;
> +
> +	sess->sequence_cap = 0;
> +	if (vdec_codec_needs_recycle(sess))
> +		sess->recycle_thread = kthread_run(vdec_recycle_thread, sess,
> +						   "vdec_recycle");
> +	mutex_unlock(&sess->lock);
> +
> +	return 0;
> +
> +vififo_free:
> +	dma_free_coherent(sess->core->dev, sess->vififo_size,
> +			  sess->vififo_vaddr, sess->vififo_paddr);
> +bufs_done:
> +	while ((buf = v4l2_m2m_src_buf_remove(sess->m2m_ctx)))
> +		v4l2_m2m_buf_done(buf, VB2_BUF_STATE_QUEUED);
> +	while ((buf = v4l2_m2m_dst_buf_remove(sess->m2m_ctx)))
> +		v4l2_m2m_buf_done(buf, VB2_BUF_STATE_QUEUED);
> +
> +	if (q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
> +		sess->streamon_out = 0;
> +	else
> +		sess->streamon_cap = 0;
> +	mutex_unlock(&sess->lock);
> +	return ret;
> +}
> +
> +static void vdec_free_canvas(struct amvdec_session *sess)
> +{
> +	int i;
> +
> +	for (i = 0; i < sess->canvas_num; ++i)
> +		meson_canvas_free(sess->core->canvas, sess->canvas_alloc[i]);
> +
> +	sess->canvas_num = 0;
> +}
> +
> +static void vdec_reset_timestamps(struct amvdec_session *sess)
> +{
> +	struct amvdec_timestamp *tmp, *n;
> +
> +	list_for_each_entry_safe(tmp, n, &sess->timestamps, list) {
> +		list_del(&tmp->list);
> +		kfree(tmp);
> +	}
> +}
> +
> +static void vdec_reset_bufs_recycle(struct amvdec_session *sess)
> +{
> +	struct amvdec_buffer *tmp, *n;
> +
> +	list_for_each_entry_safe(tmp, n, &sess->bufs_recycle, list) {
> +		list_del(&tmp->list);
> +		kfree(tmp);
> +	}
> +}
> +
> +static void vdec_stop_streaming(struct vb2_queue *q)
> +{
> +	struct amvdec_session *sess = vb2_get_drv_priv(q);
> +	struct vb2_v4l2_buffer *buf;
> +
> +	mutex_lock(&sess->lock);
> +
> +	if (sess->streamon_out && sess->streamon_cap) {
> +		if (vdec_codec_needs_recycle(sess))
> +			kthread_stop(sess->recycle_thread);
> +
> +		vdec_poweroff(sess);
> +		vdec_free_canvas(sess);
> +		dma_free_coherent(sess->core->dev, sess->vififo_size,
> +				  sess->vififo_vaddr, sess->vififo_paddr);
> +		vdec_reset_timestamps(sess);
> +		vdec_reset_bufs_recycle(sess);
> +		kfree(sess->priv);
> +		sess->priv = NULL;
> +	}
> +
> +	if (q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
> +		while ((buf = v4l2_m2m_src_buf_remove(sess->m2m_ctx)))
> +			v4l2_m2m_buf_done(buf, VB2_BUF_STATE_ERROR);
> +
> +		sess->streamon_out = 0;
> +	} else {
> +		while ((buf = v4l2_m2m_dst_buf_remove(sess->m2m_ctx)))
> +			v4l2_m2m_buf_done(buf, VB2_BUF_STATE_ERROR);
> +
> +		sess->streamon_cap = 0;
> +	}
> +
> +	mutex_unlock(&sess->lock);
> +}
> +
> +static const struct vb2_ops vdec_vb2_ops = {
> +	.queue_setup = vdec_queue_setup,
> +	.start_streaming = vdec_start_streaming,
> +	.stop_streaming = vdec_stop_streaming,
> +	.buf_queue = vdec_vb2_buf_queue,

You need to add:

        .wait_prepare    = vb2_ops_wait_prepare,
        .wait_finish     = vb2_ops_wait_finish,

and set the lock field for the vb2_queues.

Otherwise a DQBUF ioctl can block other ioctls issued from another thread
if DQBUF does a blocking wait.

> +};
> +
> +static int
> +vdec_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
> +{
> +	strlcpy(cap->driver, "meson-vdec", sizeof(cap->driver));
> +	strlcpy(cap->card, "Amlogic Video Decoder", sizeof(cap->card));
> +	strlcpy(cap->bus_info, "platform:meson-vdec", sizeof(cap->bus_info));
> +
> +	return 0;
> +}
> +
> +static const struct amvdec_format *
> +find_format(const struct amvdec_format *fmts, u32 size, u32 pixfmt)
> +{
> +	unsigned int i;
> +
> +	for (i = 0; i < size; i++) {
> +		if (fmts[i].pixfmt == pixfmt)
> +			return &fmts[i];
> +	}
> +
> +	return NULL;
> +}
> +
> +static unsigned int
> +vdec_supports_pixfmt_cap(const struct amvdec_format *fmt_out, u32 pixfmt_cap)
> +{
> +	int i;
> +
> +	for (i = 0; fmt_out->pixfmts_cap[i]; i++)
> +		if (fmt_out->pixfmts_cap[i] == pixfmt_cap)
> +			return 1;
> +
> +	return 0;
> +}
> +
> +static const struct amvdec_format *
> +vdec_try_fmt_common(struct amvdec_session *sess, u32 size,
> +		    struct v4l2_format *f)
> +{
> +	struct v4l2_pix_format_mplane *pixmp = &f->fmt.pix_mp;
> +	struct v4l2_plane_pix_format *pfmt = pixmp->plane_fmt;
> +	const struct amvdec_format *fmts = sess->core->platform->formats;
> +	const struct amvdec_format *fmt_out;
> +
> +	memset(pfmt[0].reserved, 0, sizeof(pfmt[0].reserved));
> +	memset(pixmp->reserved, 0, sizeof(pixmp->reserved));
> +
> +	if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
> +		fmt_out = find_format(fmts, size, pixmp->pixelformat);
> +		if (!fmt_out) {
> +			pixmp->pixelformat = V4L2_PIX_FMT_MPEG2;
> +			fmt_out = find_format(fmts, size, pixmp->pixelformat);
> +			pixmp->width = 1280;
> +			pixmp->height = 720;

Why set the width and height here? You normally keep that as-is.

> +		}
> +
> +		pfmt[0].sizeimage =
> +			get_output_size(pixmp->width, pixmp->height);
> +		pfmt[0].bytesperline = 0;
> +		pixmp->num_planes = 1;
> +	} else if (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
> +		fmt_out = sess->fmt_out;
> +		if (!vdec_supports_pixfmt_cap(fmt_out, pixmp->pixelformat))
> +			pixmp->pixelformat = fmt_out->pixfmts_cap[0];
> +
> +		memset(pfmt[1].reserved, 0, sizeof(pfmt[1].reserved));
> +		if (pixmp->pixelformat == V4L2_PIX_FMT_NV12M) {
> +			pfmt[0].sizeimage =
> +				get_output_size(pixmp->width, pixmp->height);
> +			pfmt[0].bytesperline = ALIGN(pixmp->width, 64);
> +
> +			pfmt[1].sizeimage =
> +			      get_output_size(pixmp->width, pixmp->height) / 2;
> +			pfmt[1].bytesperline = ALIGN(pixmp->width, 64);
> +			pixmp->num_planes = 2;
> +		} else if (pixmp->pixelformat == V4L2_PIX_FMT_YUV420M) {
> +			pfmt[0].sizeimage =
> +				get_output_size(pixmp->width, pixmp->height);
> +			pfmt[0].bytesperline = ALIGN(pixmp->width, 64);
> +
> +			pfmt[1].sizeimage =
> +			      get_output_size(pixmp->width, pixmp->height) / 4;
> +			pfmt[1].bytesperline = ALIGN(pixmp->width, 64) / 2;
> +
> +			pfmt[2].sizeimage =
> +			      get_output_size(pixmp->width, pixmp->height) / 4;
> +			pfmt[2].bytesperline = ALIGN(pixmp->width, 64) / 2;
> +			pixmp->num_planes = 3;
> +		}
> +	} else {
> +		return NULL;
> +	}
> +
> +	pixmp->width  = clamp(pixmp->width,  (u32)256, fmt_out->max_width);
> +	pixmp->height = clamp(pixmp->height, (u32)144, fmt_out->max_height);
> +
> +	if (pixmp->field == V4L2_FIELD_ANY)
> +		pixmp->field = V4L2_FIELD_NONE;
> +
> +	pixmp->flags = 0;

Shouldn't be necessary, the core takes care of that if I remember correctly.

> +
> +	return fmt_out;
> +}
> +
> +static int vdec_try_fmt(struct file *file, void *fh, struct v4l2_format *f)
> +{
> +	struct amvdec_session *sess =
> +		container_of(file->private_data, struct amvdec_session, fh);
> +
> +	vdec_try_fmt_common(sess, sess->core->platform->num_formats, f);
> +
> +	return 0;
> +}
> +
> +static int vdec_g_fmt(struct file *file, void *fh, struct v4l2_format *f)
> +{
> +	struct amvdec_session *sess =
> +		container_of(file->private_data, struct amvdec_session, fh);
> +	struct v4l2_pix_format_mplane *pixmp = &f->fmt.pix_mp;
> +
> +	if (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
> +		pixmp->pixelformat = sess->pixfmt_cap;
> +	else if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
> +		pixmp->pixelformat = sess->fmt_out->pixfmt;
> +
> +	if (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
> +		pixmp->width = sess->width;
> +		pixmp->height = sess->height;
> +		pixmp->colorspace = sess->colorspace;
> +		pixmp->ycbcr_enc = sess->ycbcr_enc;
> +		pixmp->quantization = sess->quantization;
> +		pixmp->xfer_func = sess->xfer_func;
> +	} else if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
> +		pixmp->width = sess->width;
> +		pixmp->height = sess->height;
> +	}
> +
> +	vdec_try_fmt_common(sess, sess->core->platform->num_formats, f);
> +
> +	return 0;
> +}
> +
> +static int vdec_s_fmt(struct file *file, void *fh, struct v4l2_format *f)
> +{
> +	struct amvdec_session *sess =
> +		container_of(file->private_data, struct amvdec_session, fh);
> +	struct v4l2_pix_format_mplane *pixmp = &f->fmt.pix_mp;
> +	u32 num_formats = sess->core->platform->num_formats;
> +	const struct amvdec_format *fmt_out;
> +	struct v4l2_pix_format_mplane orig_pixmp;
> +	struct v4l2_format format;
> +	u32 pixfmt_out = 0, pixfmt_cap = 0;
> +
> +	orig_pixmp = *pixmp;
> +
> +	fmt_out = vdec_try_fmt_common(sess, num_formats, f);
> +
> +	if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
> +		pixfmt_out = pixmp->pixelformat;
> +		pixfmt_cap = sess->pixfmt_cap;
> +	} else if (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
> +		pixfmt_cap = pixmp->pixelformat;
> +		pixfmt_out = sess->fmt_out->pixfmt;
> +	}
> +
> +	memset(&format, 0, sizeof(format));
> +
> +	format.type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
> +	format.fmt.pix_mp.pixelformat = pixfmt_out;
> +	format.fmt.pix_mp.width = orig_pixmp.width;
> +	format.fmt.pix_mp.height = orig_pixmp.height;
> +	vdec_try_fmt_common(sess, num_formats, &format);
> +
> +	if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
> +		sess->width = format.fmt.pix_mp.width;
> +		sess->height = format.fmt.pix_mp.height;
> +		sess->colorspace = pixmp->colorspace;
> +		sess->ycbcr_enc = pixmp->ycbcr_enc;
> +		sess->quantization = pixmp->quantization;
> +		sess->xfer_func = pixmp->xfer_func;
> +	}
> +
> +	memset(&format, 0, sizeof(format));
> +
> +	format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
> +	format.fmt.pix_mp.pixelformat = pixfmt_cap;
> +	format.fmt.pix_mp.width = orig_pixmp.width;
> +	format.fmt.pix_mp.height = orig_pixmp.height;
> +	vdec_try_fmt_common(sess, num_formats, &format);
> +
> +	sess->width = format.fmt.pix_mp.width;
> +	sess->height = format.fmt.pix_mp.height;
> +
> +	if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
> +		sess->fmt_out = fmt_out;
> +	else if (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
> +		sess->pixfmt_cap = format.fmt.pix_mp.pixelformat;
> +
> +	return 0;
> +}
> +
> +static int vdec_enum_fmt(struct file *file, void *fh, struct v4l2_fmtdesc *f)
> +{
> +	struct amvdec_session *sess =
> +		container_of(file->private_data, struct amvdec_session, fh);
> +	const struct vdec_platform *platform = sess->core->platform;
> +	const struct amvdec_format *fmt_out;
> +
> +	memset(f->reserved, 0, sizeof(f->reserved));
> +
> +	if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
> +		if (f->index >= platform->num_formats)
> +			return -EINVAL;
> +
> +		fmt_out = &platform->formats[f->index];
> +		f->pixelformat = fmt_out->pixfmt;
> +	} else if (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
> +		fmt_out = sess->fmt_out;
> +		if (f->index >= 4 || !fmt_out->pixfmts_cap[f->index])
> +			return -EINVAL;
> +
> +		f->pixelformat = fmt_out->pixfmts_cap[f->index];
> +	} else {
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +static int vdec_enum_framesizes(struct file *file, void *fh,
> +				struct v4l2_frmsizeenum *fsize)
> +{
> +	struct amvdec_session *sess =
> +		container_of(file->private_data, struct amvdec_session, fh);
> +	const struct amvdec_format *formats = sess->core->platform->formats;
> +	const struct amvdec_format *fmt;
> +	u32 num_formats = sess->core->platform->num_formats;
> +
> +	fmt = find_format(formats, num_formats, fsize->pixel_format);
> +	if (!fmt || fsize->index)
> +		return -EINVAL;
> +
> +	fsize->type = V4L2_FRMSIZE_TYPE_STEPWISE;
> +
> +	fsize->stepwise.min_width = 256;
> +	fsize->stepwise.max_width = fmt->max_width;
> +	fsize->stepwise.step_width = 1;
> +	fsize->stepwise.min_height = 144;
> +	fsize->stepwise.max_height = fmt->max_height;
> +	fsize->stepwise.step_height = 1;
> +
> +	return 0;
> +}
> +
> +static int
> +vdec_try_decoder_cmd(struct file *file, void *fh, struct v4l2_decoder_cmd *cmd)
> +{
> +	switch (cmd->cmd) {
> +	case V4L2_DEC_CMD_STOP:
> +		if (cmd->flags & V4L2_DEC_CMD_STOP_TO_BLACK)
> +			return -EINVAL;
> +		break;
> +	default:
> +		return -EINVAL;
> +	}
> +
> +	return 0;
> +}
> +
> +static int
> +vdec_decoder_cmd(struct file *file, void *fh, struct v4l2_decoder_cmd *cmd)
> +{
> +	struct amvdec_session *sess =
> +		container_of(file->private_data, struct amvdec_session, fh);
> +	struct amvdec_codec_ops *codec_ops = sess->fmt_out->codec_ops;
> +	int ret;
> +
> +	ret = vdec_try_decoder_cmd(file, fh, cmd);
> +	if (ret)
> +		return ret;
> +
> +	if (!(sess->streamon_out & sess->streamon_cap))
> +		goto unlock;
> +
> +	dev_dbg(sess->core->dev, "Received V4L2_DEC_CMD_STOP\n");
> +	sess->should_stop = 1;
> +
> +	vdec_wait_inactive(sess);
> +
> +	mutex_lock(&sess->lock);
> +	if (codec_ops->drain)
> +		codec_ops->drain(sess);
> +	else
> +		esparser_queue_eos(sess->core);
> +
> +unlock:
> +	mutex_unlock(&sess->lock);
> +	return ret;
> +}
> +
> +static int vdec_subscribe_event(struct v4l2_fh *fh,
> +				const struct v4l2_event_subscription *sub)
> +{
> +	switch (sub->type) {
> +	case V4L2_EVENT_EOS:
> +		return v4l2_event_subscribe(fh, sub, 2, NULL);
> +	default:
> +		return -EINVAL;
> +	}
> +}
> +
> +static const struct v4l2_ioctl_ops vdec_ioctl_ops = {
> +	.vidioc_querycap = vdec_querycap,
> +	.vidioc_enum_fmt_vid_cap_mplane = vdec_enum_fmt,
> +	.vidioc_enum_fmt_vid_out_mplane = vdec_enum_fmt,
> +	.vidioc_s_fmt_vid_cap_mplane = vdec_s_fmt,
> +	.vidioc_s_fmt_vid_out_mplane = vdec_s_fmt,
> +	.vidioc_g_fmt_vid_cap_mplane = vdec_g_fmt,
> +	.vidioc_g_fmt_vid_out_mplane = vdec_g_fmt,
> +	.vidioc_try_fmt_vid_cap_mplane = vdec_try_fmt,
> +	.vidioc_try_fmt_vid_out_mplane = vdec_try_fmt,
> +	.vidioc_reqbufs = v4l2_m2m_ioctl_reqbufs,
> +	.vidioc_querybuf = v4l2_m2m_ioctl_querybuf,
> +	.vidioc_create_bufs = v4l2_m2m_ioctl_create_bufs,
> +	.vidioc_prepare_buf = v4l2_m2m_ioctl_prepare_buf,
> +	.vidioc_qbuf = v4l2_m2m_ioctl_qbuf,
> +	.vidioc_expbuf = v4l2_m2m_ioctl_expbuf,
> +	.vidioc_dqbuf = v4l2_m2m_ioctl_dqbuf,
> +	.vidioc_streamon = v4l2_m2m_ioctl_streamon,
> +	.vidioc_streamoff = v4l2_m2m_ioctl_streamoff,
> +	.vidioc_enum_framesizes = vdec_enum_framesizes,
> +	.vidioc_subscribe_event = vdec_subscribe_event,
> +	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
> +	.vidioc_try_decoder_cmd = vdec_try_decoder_cmd,
> +	.vidioc_decoder_cmd = vdec_decoder_cmd,
> +};
> +
> +static int m2m_queue_init(void *priv, struct vb2_queue *src_vq,
> +			  struct vb2_queue *dst_vq)
> +{
> +	struct amvdec_session *sess = priv;
> +	int ret;
> +
> +	src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
> +	src_vq->io_modes = VB2_MMAP | VB2_DMABUF;
> +	src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
> +	src_vq->ops = &vdec_vb2_ops;
> +	src_vq->mem_ops = &vb2_dma_contig_memops;
> +	src_vq->drv_priv = sess;
> +	src_vq->buf_struct_size = sizeof(struct dummy_buf);
> +	src_vq->allow_zero_bytesused = 1;

This shouldn't be used for new drivers.

> +	src_vq->min_buffers_needed = 1;
> +	src_vq->dev = sess->core->dev;
> +	ret = vb2_queue_init(src_vq);
> +	if (ret)
> +		return ret;
> +
> +	dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
> +	dst_vq->io_modes = VB2_MMAP | VB2_DMABUF;
> +	dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
> +	dst_vq->ops = &vdec_vb2_ops;
> +	dst_vq->mem_ops = &vb2_dma_contig_memops;
> +	dst_vq->drv_priv = sess;
> +	dst_vq->buf_struct_size = sizeof(struct dummy_buf);
> +	dst_vq->allow_zero_bytesused = 1;

And it definitely makes no sense for capture queues, since this
field applies to output queues only.

> +	dst_vq->min_buffers_needed = 1;
> +	dst_vq->dev = sess->core->dev;
> +	ret = vb2_queue_init(dst_vq);

Please fill in the lock field of both queues as well.

> +	if (ret) {
> +		vb2_queue_release(src_vq);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int vdec_open(struct file *file)
> +{
> +	struct amvdec_core *core = video_drvdata(file);
> +	struct device *dev = core->dev;
> +	const struct amvdec_format *formats = core->platform->formats;
> +	struct amvdec_session *sess;
> +	int ret;
> +
> +	sess = kzalloc(sizeof(*sess), GFP_KERNEL);
> +	if (!sess) {
> +		mutex_unlock(&core->lock);
> +		return -ENOMEM;
> +	}
> +
> +	sess->core = core;
> +
> +	sess->m2m_dev = v4l2_m2m_init(&vdec_m2m_ops);
> +	if (IS_ERR(sess->m2m_dev)) {
> +		dev_err(dev, "Fail to v4l2_m2m_init\n");
> +		ret = PTR_ERR(sess->m2m_dev);
> +		goto err_free_sess;
> +	}
> +
> +	sess->m2m_ctx = v4l2_m2m_ctx_init(sess->m2m_dev, sess, m2m_queue_init);
> +	if (IS_ERR(sess->m2m_ctx)) {
> +		dev_err(dev, "Fail to v4l2_m2m_ctx_init\n");
> +		ret = PTR_ERR(sess->m2m_ctx);
> +		goto err_m2m_release;
> +	}
> +
> +	sess->pixfmt_cap = formats[0].pixfmts_cap[0];
> +	sess->fmt_out = &formats[0];
> +	sess->width = 1280;
> +	sess->height = 720;
> +
> +	INIT_LIST_HEAD(&sess->timestamps);
> +	INIT_LIST_HEAD(&sess->bufs_recycle);
> +	INIT_WORK(&sess->esparser_queue_work, esparser_queue_all_src);
> +	mutex_init(&sess->lock);
> +	mutex_init(&sess->bufs_recycle_lock);
> +	spin_lock_init(&sess->ts_spinlock);
> +
> +	v4l2_fh_init(&sess->fh, core->vdev_dec);
> +	v4l2_fh_add(&sess->fh);
> +	sess->fh.m2m_ctx = sess->m2m_ctx;
> +	file->private_data = &sess->fh;
> +
> +	return 0;
> +
> +err_m2m_release:
> +	v4l2_m2m_release(sess->m2m_dev);
> +err_free_sess:
> +	kfree(sess);
> +	return ret;
> +}
> +
> +static int vdec_close(struct file *file)
> +{
> +	struct amvdec_session *sess =
> +		container_of(file->private_data, struct amvdec_session, fh);
> +	struct amvdec_core *core = sess->core;
> +
> +	v4l2_m2m_ctx_release(sess->m2m_ctx);
> +	v4l2_m2m_release(sess->m2m_dev);
> +	v4l2_fh_del(&sess->fh);
> +	v4l2_fh_exit(&sess->fh);
> +
> +	mutex_destroy(&sess->lock);
> +	mutex_destroy(&sess->bufs_recycle_lock);
> +
> +	kfree(sess);
> +
> +	if (core->cur_sess == sess)
> +		core->cur_sess = NULL;
> +
> +	return 0;
> +}
> +
> +static const struct v4l2_file_operations vdec_fops = {
> +	.owner = THIS_MODULE,
> +	.open = vdec_open,
> +	.release = vdec_close,
> +	.unlocked_ioctl = video_ioctl2,
> +	.poll = v4l2_m2m_fop_poll,
> +	.mmap = v4l2_m2m_fop_mmap,
> +#ifdef CONFIG_COMPAT
> +	.compat_ioctl32 = v4l2_compat_ioctl32,
> +#endif

Not needed. It's only needed if you have custom ioctls, and you don't.

> +};
> +
> +static irqreturn_t vdec_isr(int irq, void *data)
> +{
> +	struct amvdec_core *core = data;
> +	struct amvdec_session *sess = core->cur_sess;
> +
> +	sess->last_irq_jiffies = get_jiffies_64();
> +
> +	return sess->fmt_out->codec_ops->isr(sess);
> +}
> +
> +static irqreturn_t vdec_threaded_isr(int irq, void *data)
> +{
> +	struct amvdec_core *core = data;
> +	struct amvdec_session *sess = core->cur_sess;
> +
> +	return sess->fmt_out->codec_ops->threaded_isr(sess);
> +}
> +
> +static const struct of_device_id vdec_dt_match[] = {
> +	{ .compatible = "amlogic,gxbb-vdec",
> +	  .data = &vdec_platform_gxbb },
> +	{ .compatible = "amlogic,gxm-vdec",
> +	  .data = &vdec_platform_gxm },
> +	{ .compatible = "amlogic,gxl-vdec",
> +	  .data = &vdec_platform_gxl },
> +	{}
> +};
> +MODULE_DEVICE_TABLE(of, vdec_dt_match);
> +
> +static int vdec_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct video_device *vdev;
> +	struct amvdec_core *core;
> +	struct resource *r;
> +	const struct of_device_id *of_id;
> +	int irq;
> +	int ret;
> +
> +	core = devm_kzalloc(dev, sizeof(*core), GFP_KERNEL);
> +	if (!core)
> +		return -ENOMEM;
> +
> +	core->dev = dev;
> +	platform_set_drvdata(pdev, core);
> +
> +	r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dos");
> +	core->dos_base = devm_ioremap_resource(dev, r);
> +	if (IS_ERR(core->dos_base)) {
> +		dev_err(dev, "Couldn't remap DOS memory\n");
> +		return PTR_ERR(core->dos_base);
> +	}
> +
> +	r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "esparser");
> +	core->esparser_base = devm_ioremap_resource(dev, r);
> +	if (IS_ERR(core->esparser_base)) {
> +		dev_err(dev, "Couldn't remap ESPARSER memory\n");
> +		return PTR_ERR(core->esparser_base);
> +	}
> +
> +	core->regmap_ao = syscon_regmap_lookup_by_phandle(dev->of_node,
> +							 "amlogic,ao-sysctrl");
> +	if (IS_ERR(core->regmap_ao)) {
> +		dev_err(dev, "Couldn't regmap AO sysctrl\n");
> +		return PTR_ERR(core->regmap_ao);
> +	}
> +
> +	core->canvas = meson_canvas_get(dev);
> +	if (!core->canvas)
> +		return PTR_ERR(core->canvas);
> +
> +	core->dos_parser_clk = devm_clk_get(dev, "dos_parser");
> +	if (IS_ERR(core->dos_parser_clk))
> +		return -EPROBE_DEFER;
> +
> +	core->dos_clk = devm_clk_get(dev, "dos");
> +	if (IS_ERR(core->dos_clk))
> +		return -EPROBE_DEFER;
> +
> +	core->vdec_1_clk = devm_clk_get(dev, "vdec_1");
> +	if (IS_ERR(core->vdec_1_clk))
> +		return -EPROBE_DEFER;
> +
> +	core->vdec_hevc_clk = devm_clk_get(dev, "vdec_hevc");
> +	if (IS_ERR(core->vdec_hevc_clk))
> +		return -EPROBE_DEFER;
> +
> +	irq = platform_get_irq(pdev, 0);
> +	if (irq < 0)
> +		return irq;
> +
> +	ret = devm_request_threaded_irq(core->dev, irq, vdec_isr,
> +					vdec_threaded_isr, IRQF_ONESHOT,
> +					"vdec", core);
> +	if (ret)
> +		return ret;
> +
> +	ret = esparser_init(pdev, core);
> +	if (ret)
> +		return ret;
> +
> +	ret = v4l2_device_register(dev, &core->v4l2_dev);
> +	if (ret) {
> +		dev_err(dev, "Couldn't register v4l2 device\n");
> +		return -ENOMEM;
> +	}
> +
> +	vdev = video_device_alloc();
> +	if (!vdev) {
> +		ret = -ENOMEM;
> +		goto err_vdev_release;
> +	}
> +
> +	strlcpy(vdev->name, "meson-video-decoder", sizeof(vdev->name));
> +	vdev->release = video_device_release;
> +	vdev->fops = &vdec_fops;
> +	vdev->ioctl_ops = &vdec_ioctl_ops;
> +	vdev->vfl_dir = VFL_DIR_M2M;
> +	vdev->v4l2_dev = &core->v4l2_dev;

Please fill in vdev->lock, you probably want to set it to &core->lock
(not sure, though). Otherwise you would have to serialize all ioctls yourself.

> +	vdev->device_caps = V4L2_CAP_VIDEO_M2M_MPLANE | V4L2_CAP_STREAMING;
> +
> +	ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
> +	if (ret) {
> +		dev_err(dev, "Failed registering video device\n");
> +		goto err_vdev_release;
> +	}
> +
> +	of_id = of_match_node(vdec_dt_match, dev->of_node);
> +	core->platform = of_id->data;
> +	core->vdev_dec = vdev;
> +	core->dev_dec = dev;
> +	mutex_init(&core->lock);
> +
> +	video_set_drvdata(vdev, core);

I'd move all this to before the video_register_device() call. Otherwise the video device
can appear and used immediately without this initialization being done.

> +
> +	return 0;
> +
> +err_vdev_release:
> +	video_device_release(vdev);
> +	return ret;
> +}
> +
> +static int vdec_remove(struct platform_device *pdev)
> +{
> +	struct amvdec_core *core = platform_get_drvdata(pdev);
> +
> +	video_unregister_device(core->vdev_dec);
> +
> +	return 0;
> +}
> +
> +static struct platform_driver meson_vdec_driver = {
> +	.probe = vdec_probe,
> +	.remove = vdec_remove,
> +	.driver = {
> +		.name = "meson-vdec",
> +		.of_match_table = vdec_dt_match,
> +	},
> +};
> +module_platform_driver(meson_vdec_driver);
> +
> +MODULE_DESCRIPTION("Meson video decoder driver for GXBB/GXL/GXM");
> +MODULE_AUTHOR("Maxime Jourdan <[e-mail]>");
> +MODULE_LICENSE("GPL");
> diff --git a/drivers/media/platform/meson/vdec/vdec.h b/drivers/media/platform/meson/vdec/vdec.h
> new file mode 100644
> index 000000000000..8250fb82dfab
> --- /dev/null
> +++ b/drivers/media/platform/meson/vdec/vdec.h
> @@ -0,0 +1,234 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * Copyright (C) 2018 BayLibre, SAS
> + * Author: Maxime Jourdan <[e-mail]>
> + */
> +
> +#ifndef __MESON_VDEC_CORE_H_
> +#define __MESON_VDEC_CORE_H_
> +
> +/* 32 buffers in 3-plane YUV420 */
> +#define MAX_CANVAS (32 * 3)
> +
> +#include <linux/regmap.h>
> +#include <linux/list.h>
> +#include <media/videobuf2-v4l2.h>
> +#include <media/v4l2-ctrls.h>
> +#include <media/v4l2-device.h>
> +#include <linux/soc/amlogic/meson-canvas.h>
> +
> +#include "vdec_platform.h"
> +
> +struct amvdec_buffer {
> +	struct list_head list;
> +	struct vb2_buffer *vb;
> +};
> +
> +struct amvdec_timestamp {
> +	struct list_head list;
> +	u64 ts;
> +};
> +
> +struct amvdec_session;
> +
> +/**
> + * struct amvdec_core - device parameters, singleton
> + *
> + * @dos_base: DOS memory base address
> + * @esparser_base: PARSER memory base address
> + * @regmap_ao: regmap for the AO bus
> + * @dev: core device
> + * @dev_dec: decoder device
> + * @platform: platform-specific data
> + * @canvas: canvas provider reference
> + * @dos_parser_clk: DOS_PARSER clock
> + * @dos_clk: DOS clock
> + * @vdec_1_clk: VDEC_1 clock
> + * @vdec_hevc_clk: VDEC_HEVC clock
> + * @esparser_reset: RESET for the PARSER
> + * @vdec_dec: video device for the decoder
> + * @v4l2_dev: v4l2 device
> + * @cur_sess: current decoding session
> + * @lock: lock for this structure
> + */
> +struct amvdec_core {
> +	void __iomem *dos_base;
> +	void __iomem *esparser_base;
> +	struct regmap *regmap_ao;
> +
> +	struct device *dev;
> +	struct device *dev_dec;
> +	const struct vdec_platform *platform;
> +
> +	struct meson_canvas *canvas;
> +
> +	struct clk *dos_parser_clk;
> +	struct clk *dos_clk;
> +	struct clk *vdec_1_clk;
> +	struct clk *vdec_hevc_clk;
> +
> +	struct reset_control *esparser_reset;
> +
> +	struct video_device *vdev_dec;
> +	struct v4l2_device v4l2_dev;
> +
> +	struct amvdec_session *cur_sess;
> +	struct mutex lock;
> +};
> +
> +/**
> + * struct amvdec_ops - vdec operations
> + *
> + * @start: mandatory call when the vdec needs to initialize
> + * @stop: mandatory call when the vdec needs to stop
> + * @conf_esparser: mandatory call to let the vdec configure the ESPARSER
> + * @vififo_level: mandatory call to get the current amount of data
> + *		  in the VIFIFO
> + */
> +struct amvdec_ops {
> +	int (*start)(struct amvdec_session *sess);
> +	int (*stop)(struct amvdec_session *sess);
> +	void (*conf_esparser)(struct amvdec_session *sess);
> +	u32 (*vififo_level)(struct amvdec_session *sess);
> +};
> +
> +/**
> + * struct amvdec_codec_ops - codec operations
> + *
> + * @start: mandatory call when the codec needs to initialize
> + * @stop: mandatory call when the codec needs to stop
> + * @load_extended_firmware: optional call to load additional firmware bits
> + * @num_pending_bufs: optional call to get the number of dst buffers on hold
> + * @can_recycle: optional call to know if the codec is ready to recycle
> + *		 a dst buffer
> + * @recycle: optional call to tell the codec to recycle a dst buffer. Must go
> + *	     in pair with can_recycle
> + * @drain: optional call if the codec has a custom way of draining
> + * @isr: mandatory call when the ISR triggers
> + * @threaded_isr: mandatory call for the threaded ISR
> + */
> +struct amvdec_codec_ops {
> +	int (*start)(struct amvdec_session *sess);
> +	int (*stop)(struct amvdec_session *sess);
> +	int (*load_extended_firmware)(struct amvdec_session *sess,
> +				      const u8 *data, u32 len);
> +	u32 (*num_pending_bufs)(struct amvdec_session *sess);
> +	int (*can_recycle)(struct amvdec_core *core);
> +	void (*recycle)(struct amvdec_core *core, u32 buf_idx);
> +	void (*drain)(struct amvdec_session *sess);
> +	irqreturn_t (*isr)(struct amvdec_session *sess);
> +	irqreturn_t (*threaded_isr)(struct amvdec_session *sess);
> +};
> +
> +/**
> + * struct amvdec_format - describes one of the OUTPUT (src) format supported
> + *
> + * @pixfmt: V4L2 pixel format
> + * @min_buffers: minimum amount of CAPTURE (dst) buffers
> + * @max_buffers: maximum amount of CAPTURE (dst) buffers
> + * @max_width: maximum picture width supported
> + * @max_height: maximum picture height supported
> + * @vdec_ops: the VDEC operations that support this format
> + * @codec_ops: the codec operations that support this format
> + * @firmware_path: Path to the firmware that supports this format
> + * @pixfmts_cap: list of CAPTURE pixel formats available with pixfmt
> + */
> +struct amvdec_format {
> +	u32 pixfmt;
> +	u32 min_buffers;
> +	u32 max_buffers;
> +	u32 max_width;
> +	u32 max_height;
> +
> +	struct amvdec_ops *vdec_ops;
> +	struct amvdec_codec_ops *codec_ops;
> +
> +	char *firmware_path;
> +	u32 pixfmts_cap[4];
> +};
> +
> +/**
> + * struct amvdec_session - decoding session parameters
> + *
> + * @core: reference to the vdec core struct
> + * @fh: v4l2 file handle
> + * @m2m_dev: v4l2 m2m device
> + * @m2m_ctx: v4l2 m2m context
> + * @lock: session lock
> + * @fmt_out: vdec pixel format for the OUTPUT queue
> + * @pixfmt_cap: V4L2 pixel format for the CAPTURE queue
> + * @width: current picture width
> + * @height: current picture height
> + * @colorspace: current colorspace
> + * @ycbcr_enc: current ycbcr_enc
> + * @quantization: current quantization
> + * @xfer_func: current transfer function
> + * @esparser_queued_bufs: number of buffers currently queued into ESPARSER
> + * @esparser_queue_work: work struct for the ESPARSER to process src buffers
> + * @streamon_cap: stream on flag for capture queue
> + * @streamon_out: stream on flag for output queue
> + * @sequence_cap: capture sequence counter
> + * @should_stop: flag set is userspacec signaled EOS via command
> + *		 or empty buffer
> + * @keyframe_found: flag set once a keyframe has been parsed
> + * @canvas_alloc: array of all the canvas IDs allocated
> + * @canvas_num: number of canvas IDs allocated
> + * @vififo_vaddr: virtual address for the VIFIFO
> + * @vififo_paddr: physical address for the VIFIFO
> + * @vififo_size: size of the VIFIFO dma alloc
> + * @bufs_recycle: list of buffers that need to be recycled
> + * @bufs_recycle_lock: lock for the bufs_recycle list
> + * @recycle_thread: task struct for the recycling thread
> + * @timestamps: chronological list of src timestamps
> + * @ts_spinlock: spinlock for the timestamps list
> + * @last_irq_jiffies: tracks last time the vdec triggered an IRQ
> + * @priv: codec private data
> + */
> +struct amvdec_session {
> +	struct amvdec_core *core;
> +
> +	struct v4l2_fh fh;
> +	struct v4l2_m2m_dev *m2m_dev;
> +	struct v4l2_m2m_ctx *m2m_ctx;
> +	struct mutex lock;
> +
> +	const struct amvdec_format *fmt_out;
> +	u32 pixfmt_cap;
> +
> +	u32 width;
> +	u32 height;
> +	u32 colorspace;
> +	u8 ycbcr_enc;
> +	u8 quantization;
> +	u8 xfer_func;
> +
> +	atomic_t esparser_queued_bufs;
> +	struct work_struct esparser_queue_work;
> +
> +	unsigned int streamon_cap, streamon_out;
> +	unsigned int sequence_cap;
> +	unsigned int should_stop;
> +	unsigned int keyframe_found;
> +
> +	u8 canvas_alloc[MAX_CANVAS];
> +	u32 canvas_num;
> +
> +	void *vififo_vaddr;
> +	dma_addr_t vififo_paddr;
> +	u32 vififo_size;
> +
> +	struct list_head bufs_recycle;
> +	struct mutex bufs_recycle_lock;
> +	struct task_struct *recycle_thread;
> +
> +	struct list_head timestamps;
> +	spinlock_t ts_spinlock;
> +
> +	u64 last_irq_jiffies;
> +
> +	void *priv;
> +};
> +
> +u32 amvdec_get_output_size(struct amvdec_session *sess);
> +
> +#endif
> diff --git a/drivers/media/platform/meson/vdec/vdec_1.c b/drivers/media/platform/meson/vdec/vdec_1.c
> new file mode 100644
> index 000000000000..29f6305a6276
> --- /dev/null
> +++ b/drivers/media/platform/meson/vdec/vdec_1.c
> @@ -0,0 +1,228 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2018 BayLibre, SAS
> + * Author: Maxime Jourdan <[e-mail]>
> + *
> + * VDEC_1 is a video decoding block that allows decoding of
> + * MPEG 1/2/4, H.263, H.264, MJPEG, VC1
> + */
> +
> +#include <linux/firmware.h>
> +#include <linux/clk.h>
> +
> +#include "vdec_1.h"
> +#include "vdec_helpers.h"
> +#include "dos_regs.h"
> +
> +/* AO Registers */
> +#define AO_RTI_GEN_PWR_SLEEP0	0xe8
> +#define AO_RTI_GEN_PWR_ISO0	0xec
> +	#define GEN_PWR_VDEC_1 (BIT(3) | BIT(2))
> +
> +#define MC_SIZE			(4096 * 4)
> +
> +static int
> +vdec_1_load_firmware(struct amvdec_session *sess, const char *fwname)
> +{
> +	const struct firmware *fw;
> +	struct amvdec_core *core = sess->core;
> +	struct device *dev = core->dev_dec;
> +	struct amvdec_codec_ops *codec_ops = sess->fmt_out->codec_ops;
> +	static void *mc_addr;
> +	static dma_addr_t mc_addr_map;
> +	int ret;
> +	u32 i = 1000;
> +
> +	ret = request_firmware(&fw, fwname, dev);
> +	if (ret < 0)
> +		return -EINVAL;
> +
> +	if (fw->size < MC_SIZE) {
> +		dev_err(dev, "Firmware size %zu is too small. Expected %u.\n",
> +			fw->size, MC_SIZE);
> +		ret = -EINVAL;
> +		goto release_firmware;
> +	}
> +
> +	mc_addr = dma_alloc_coherent(core->dev, MC_SIZE,
> +				     &mc_addr_map, GFP_KERNEL);
> +	if (!mc_addr) {
> +		dev_err(dev,
> +			"Failed allocating memory for firmware loading\n");
> +		ret = -ENOMEM;
> +		goto release_firmware;
> +	}
> +
> +	memcpy(mc_addr, fw->data, MC_SIZE);
> +
> +	amvdec_write_dos(core, MPSR, 0);
> +	amvdec_write_dos(core, CPSR, 0);
> +
> +	amvdec_clear_dos_bits(core, MDEC_PIC_DC_CTRL, BIT(31));
> +
> +	amvdec_write_dos(core, IMEM_DMA_ADR, mc_addr_map);
> +	amvdec_write_dos(core, IMEM_DMA_COUNT, MC_SIZE / 4);
> +	amvdec_write_dos(core, IMEM_DMA_CTRL, (0x8000 | (7 << 16)));
> +
> +	while (--i && amvdec_read_dos(core, IMEM_DMA_CTRL) & 0x8000) { }
> +
> +	if (i == 0) {
> +		dev_err(dev, "Firmware load fail (DMA hang?)\n");
> +		ret = -EINVAL;
> +		goto free_mc;
> +	}
> +
> +	if (codec_ops->load_extended_firmware)
> +		codec_ops->load_extended_firmware(sess, fw->data + MC_SIZE,
> +						  fw->size - MC_SIZE);
> +
> +free_mc:
> +	dma_free_coherent(core->dev, MC_SIZE, mc_addr, mc_addr_map);
> +release_firmware:
> +	release_firmware(fw);
> +	return ret;
> +}
> +
> +int vdec_1_stbuf_power_up(struct amvdec_session *sess)
> +{
> +	struct amvdec_core *core = sess->core;
> +
> +	amvdec_write_dos(core, VLD_MEM_VIFIFO_CONTROL, 0);
> +	amvdec_write_dos(core, VLD_MEM_VIFIFO_WRAP_COUNT, 0);
> +	amvdec_write_dos(core, POWER_CTL_VLD, BIT(4));
> +
> +	amvdec_write_dos(core, VLD_MEM_VIFIFO_START_PTR, sess->vififo_paddr);
> +	amvdec_write_dos(core, VLD_MEM_VIFIFO_CURR_PTR, sess->vififo_paddr);
> +	amvdec_write_dos(core, VLD_MEM_VIFIFO_END_PTR,
> +			 sess->vififo_paddr + sess->vififo_size - 8);
> +
> +	amvdec_write_dos_bits(core, VLD_MEM_VIFIFO_CONTROL, 1);
> +	amvdec_clear_dos_bits(core, VLD_MEM_VIFIFO_CONTROL, 1);
> +
> +	amvdec_write_dos(core, VLD_MEM_VIFIFO_BUF_CNTL, MEM_BUFCTRL_MANUAL);
> +	amvdec_write_dos(core, VLD_MEM_VIFIFO_WP, sess->vififo_paddr);
> +
> +	amvdec_write_dos_bits(core, VLD_MEM_VIFIFO_BUF_CNTL, 1);
> +	amvdec_clear_dos_bits(core, VLD_MEM_VIFIFO_BUF_CNTL, 1);
> +
> +	amvdec_write_dos_bits(core, VLD_MEM_VIFIFO_CONTROL,
> +		(0x11 << MEM_FIFO_CNT_BIT) | MEM_FILL_ON_LEVEL |
> +		MEM_CTRL_FILL_EN | MEM_CTRL_EMPTY_EN);
> +
> +	return 0;
> +}
> +
> +static void vdec_1_conf_esparser(struct amvdec_session *sess)
> +{
> +	struct amvdec_core *core = sess->core;
> +
> +	/* VDEC_1 specific ESPARSER stuff */
> +	amvdec_write_dos(core, DOS_GEN_CTRL0, 0);
> +	amvdec_write_dos(core, VLD_MEM_VIFIFO_BUF_CNTL, 1);
> +	amvdec_clear_dos_bits(core, VLD_MEM_VIFIFO_BUF_CNTL, 1);
> +}
> +
> +static u32 vdec_1_vififo_level(struct amvdec_session *sess)
> +{
> +	struct amvdec_core *core = sess->core;
> +
> +	return amvdec_read_dos(core, VLD_MEM_VIFIFO_LEVEL);
> +}
> +
> +static int vdec_1_stop(struct amvdec_session *sess)
> +{
> +	struct amvdec_core *core = sess->core;
> +	struct amvdec_codec_ops *codec_ops = sess->fmt_out->codec_ops;
> +
> +	amvdec_write_dos(core, MPSR, 0);
> +	amvdec_write_dos(core, CPSR, 0);
> +	amvdec_write_dos(core, ASSIST_MBOX1_MASK, 0);
> +
> +	amvdec_write_dos(core, DOS_SW_RESET0, BIT(12) | BIT(11));
> +	amvdec_write_dos(core, DOS_SW_RESET0, 0);
> +	amvdec_read_dos(core, DOS_SW_RESET0);
> +
> +	/* enable vdec1 isolation */
> +	regmap_write(core->regmap_ao, AO_RTI_GEN_PWR_ISO0, 0xc0);
> +	/* power off vdec1 memories */
> +	amvdec_write_dos(core, DOS_MEM_PD_VDEC, 0xffffffff);
> +	/* power off vdec1 */
> +	regmap_update_bits(core->regmap_ao, AO_RTI_GEN_PWR_SLEEP0,
> +			   GEN_PWR_VDEC_1, GEN_PWR_VDEC_1);
> +
> +	clk_disable_unprepare(core->vdec_1_clk);
> +
> +	if (sess->priv)
> +		codec_ops->stop(sess);
> +
> +	return 0;
> +}
> +
> +static int vdec_1_start(struct amvdec_session *sess)
> +{
> +	int ret;
> +	struct amvdec_core *core = sess->core;
> +	struct amvdec_codec_ops *codec_ops = sess->fmt_out->codec_ops;
> +
> +	/* Configure the vdec clk to the maximum available */
> +	clk_set_rate(core->vdec_1_clk, 666666666);
> +	ret = clk_prepare_enable(core->vdec_1_clk);
> +	if (ret)
> +		return ret;
> +
> +	regmap_update_bits(core->regmap_ao, AO_RTI_GEN_PWR_SLEEP0,
> +			   GEN_PWR_VDEC_1, 0);
> +	udelay(10);
> +
> +	/* Reset VDEC1 */
> +	amvdec_write_dos(core, DOS_SW_RESET0, 0xfffffffc);
> +	amvdec_write_dos(core, DOS_SW_RESET0, 0x00000000);
> +
> +	amvdec_write_dos(core, DOS_GCLK_EN0, 0x3ff);
> +
> +	/* enable VDEC Memories */
> +	amvdec_write_dos(core, DOS_MEM_PD_VDEC, 0);
> +	/* Remove VDEC1 Isolation */
> +	regmap_write(core->regmap_ao, AO_RTI_GEN_PWR_ISO0, 0);
> +	/* Reset DOS top registers */
> +	amvdec_write_dos(core, DOS_VDEC_MCRCC_STALL_CTRL, 0);
> +
> +	amvdec_write_dos(core, GCLK_EN, 0x3ff);
> +	amvdec_clear_dos_bits(core, MDEC_PIC_DC_CTRL, BIT(31));
> +
> +	vdec_1_stbuf_power_up(sess);
> +
> +	ret = vdec_1_load_firmware(sess, sess->fmt_out->firmware_path);
> +	if (ret)
> +		goto stop;
> +
> +	ret = codec_ops->start(sess);
> +	if (ret)
> +		goto stop;
> +
> +	/* Enable IRQ */
> +	amvdec_write_dos(core, ASSIST_MBOX1_CLR_REG, 1);
> +	amvdec_write_dos(core, ASSIST_MBOX1_MASK, 1);
> +
> +	/* Enable 2-plane output */
> +	if (sess->pixfmt_cap == V4L2_PIX_FMT_NV12M)
> +		amvdec_write_dos_bits(core, MDEC_PIC_DC_CTRL, BIT(17));
> +
> +	/* Enable firmware processor */
> +	amvdec_write_dos(core, MPSR, 1);
> +	/* Let the firmware settle */
> +	udelay(10);
> +
> +	return 0;
> +
> +stop:
> +	vdec_1_stop(sess);
> +	return ret;
> +}
> +
> +struct amvdec_ops vdec_1_ops = {
> +	.start = vdec_1_start,
> +	.stop = vdec_1_stop,
> +	.conf_esparser = vdec_1_conf_esparser,
> +	.vififo_level = vdec_1_vififo_level,
> +};
> diff --git a/drivers/media/platform/meson/vdec/vdec_1.h b/drivers/media/platform/meson/vdec/vdec_1.h
> new file mode 100644
> index 000000000000..042d930c40d7
> --- /dev/null
> +++ b/drivers/media/platform/meson/vdec/vdec_1.h
> @@ -0,0 +1,14 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * Copyright (C) 2018 BayLibre, SAS
> + * Author: Maxime Jourdan <[e-mail]>
> + */
> +
> +#ifndef __MESON_VDEC_VDEC_1_H_
> +#define __MESON_VDEC_VDEC_1_H_
> +
> +#include "vdec.h"
> +
> +extern struct amvdec_ops vdec_1_ops;
> +
> +#endif
> diff --git a/drivers/media/platform/meson/vdec/vdec_helpers.c b/drivers/media/platform/meson/vdec/vdec_helpers.c
> new file mode 100644
> index 000000000000..615107629765
> --- /dev/null
> +++ b/drivers/media/platform/meson/vdec/vdec_helpers.c
> @@ -0,0 +1,354 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2018 BayLibre, SAS
> + * Author: Maxime Jourdan <[e-mail]>
> + */
> +
> +#include <media/v4l2-mem2mem.h>
> +#include <media/v4l2-event.h>
> +#include <media/videobuf2-dma-contig.h>
> +
> +#include "vdec_helpers.h"
> +
> +#define NUM_CANVAS_NV12 2
> +#define NUM_CANVAS_YUV420 3
> +
> +u32 amvdec_read_dos(struct amvdec_core *core, u32 reg)
> +{
> +	return readl_relaxed(core->dos_base + reg);
> +}
> +EXPORT_SYMBOL_GPL(amvdec_read_dos);
> +
> +void amvdec_write_dos(struct amvdec_core *core, u32 reg, u32 val)
> +{
> +	writel_relaxed(val, core->dos_base + reg);
> +}
> +EXPORT_SYMBOL_GPL(amvdec_write_dos);
> +
> +void amvdec_write_dos_bits(struct amvdec_core *core, u32 reg, u32 val)
> +{
> +	amvdec_write_dos(core, reg, amvdec_read_dos(core, reg) | val);
> +}
> +EXPORT_SYMBOL_GPL(amvdec_write_dos_bits);
> +
> +void amvdec_clear_dos_bits(struct amvdec_core *core, u32 reg, u32 val)
> +{
> +	amvdec_write_dos(core, reg, amvdec_read_dos(core, reg) & ~val);
> +}
> +EXPORT_SYMBOL_GPL(amvdec_clear_dos_bits);
> +
> +u32 amvdec_read_parser(struct amvdec_core *core, u32 reg)
> +{
> +	return readl_relaxed(core->esparser_base + reg);
> +}
> +EXPORT_SYMBOL_GPL(amvdec_read_parser);
> +
> +void amvdec_write_parser(struct amvdec_core *core, u32 reg, u32 val)
> +{
> +	writel_relaxed(val, core->esparser_base + reg);
> +}
> +EXPORT_SYMBOL_GPL(amvdec_write_parser);
> +
> +static int canvas_alloc(struct amvdec_session *sess, u8 *canvas_id)
> +{
> +	int ret;
> +
> +	if (sess->canvas_num >= MAX_CANVAS) {
> +		dev_err(sess->core->dev, "Reached max number of canvas\n");
> +		return -ENOMEM;
> +	}
> +
> +	ret = meson_canvas_alloc(sess->core->canvas, canvas_id);
> +	if (ret)
> +		return ret;
> +
> +	sess->canvas_alloc[sess->canvas_num++] = *canvas_id;
> +	return 0;
> +}
> +
> +static int set_canvas_yuv420m(struct amvdec_session *sess,
> +			      struct vb2_buffer *vb, u32 width,
> +			      u32 height, u32 reg)
> +{
> +	struct amvdec_core *core = sess->core;
> +	u8 canvas_id[NUM_CANVAS_YUV420]; /* Y U V */
> +	dma_addr_t buf_paddr[NUM_CANVAS_YUV420]; /* Y U V */
> +	int ret, i;
> +
> +	for (i = 0; i < NUM_CANVAS_YUV420; ++i) {
> +		ret = canvas_alloc(sess, &canvas_id[i]);
> +		if (ret)
> +			return ret;
> +
> +		buf_paddr[i] =
> +		    vb2_dma_contig_plane_dma_addr(vb, i);
> +	}
> +
> +	/* Y plane */
> +	meson_canvas_config(core->canvas, canvas_id[0], buf_paddr[0],
> +			    width, height, MESON_CANVAS_WRAP_NONE,
> +			    MESON_CANVAS_BLKMODE_LINEAR,
> +			    MESON_CANVAS_ENDIAN_SWAP64);
> +
> +	/* U plane */
> +	meson_canvas_config(core->canvas, canvas_id[1], buf_paddr[1],
> +			    width / 2, height / 2, MESON_CANVAS_WRAP_NONE,
> +			    MESON_CANVAS_BLKMODE_LINEAR,
> +			    MESON_CANVAS_ENDIAN_SWAP64);
> +
> +	/* V plane */
> +	meson_canvas_config(core->canvas, canvas_id[2], buf_paddr[2],
> +			    width / 2, height / 2, MESON_CANVAS_WRAP_NONE,
> +			    MESON_CANVAS_BLKMODE_LINEAR,
> +			    MESON_CANVAS_ENDIAN_SWAP64);
> +
> +	amvdec_write_dos(core, reg,
> +			 ((canvas_id[2]) << 16) |
> +			 ((canvas_id[1]) << 8)  |
> +			 (canvas_id[0]));
> +
> +	return 0;
> +}
> +
> +static int set_canvas_nv12m(struct amvdec_session *sess,
> +			    struct vb2_buffer *vb, u32 width,
> +			    u32 height, u32 reg)
> +{
> +	struct amvdec_core *core = sess->core;
> +	u8 canvas_id[NUM_CANVAS_NV12]; /* Y U/V */
> +	dma_addr_t buf_paddr[NUM_CANVAS_NV12]; /* Y U/V */
> +	int ret, i;
> +
> +	for (i = 0; i < NUM_CANVAS_NV12; ++i) {
> +		ret = canvas_alloc(sess, &canvas_id[i]);
> +		if (ret)
> +			return ret;
> +
> +		buf_paddr[i] =
> +		    vb2_dma_contig_plane_dma_addr(vb, i);
> +	}
> +
> +	/* Y plane */
> +	meson_canvas_config(core->canvas, canvas_id[0], buf_paddr[0],
> +			    width, height, MESON_CANVAS_WRAP_NONE,
> +			    MESON_CANVAS_BLKMODE_LINEAR,
> +			    MESON_CANVAS_ENDIAN_SWAP64);
> +
> +	/* U/V plane */
> +	meson_canvas_config(core->canvas, canvas_id[1], buf_paddr[1],
> +			    width, height / 2, MESON_CANVAS_WRAP_NONE,
> +			    MESON_CANVAS_BLKMODE_LINEAR,
> +			    MESON_CANVAS_ENDIAN_SWAP64);
> +
> +	amvdec_write_dos(core, reg,
> +			 ((canvas_id[1]) << 16) |
> +			 ((canvas_id[1]) << 8)  |
> +			 (canvas_id[0]));
> +
> +	return 0;
> +}
> +
> +int amvdec_set_canvases(struct amvdec_session *sess,
> +			u32 reg_base[], u32 reg_num[])
> +{
> +	struct v4l2_m2m_buffer *buf;
> +	u32 pixfmt = sess->pixfmt_cap;
> +	u32 width = ALIGN(sess->width, 64);
> +	u32 height = ALIGN(sess->height, 64);
> +	u32 reg_cur = reg_base[0];
> +	u32 reg_num_cur = 0;
> +	u32 reg_base_cur = 0;
> +	int ret;
> +
> +	v4l2_m2m_for_each_dst_buf(sess->m2m_ctx, buf) {
> +		if (!reg_base[reg_base_cur])
> +			return -EINVAL;
> +
> +		reg_cur = reg_base[reg_base_cur] + reg_num_cur * 4;
> +
> +		switch (pixfmt) {
> +		case V4L2_PIX_FMT_NV12M:
> +			ret = set_canvas_nv12m(sess, &buf->vb.vb2_buf, width,
> +					       height, reg_cur);
> +			if (ret)
> +				return ret;
> +			break;
> +		case V4L2_PIX_FMT_YUV420M:
> +			ret = set_canvas_yuv420m(sess, &buf->vb.vb2_buf, width,
> +						 height, reg_cur);
> +			if (ret)
> +				return ret;
> +			break;
> +		default:
> +			dev_err(sess->core->dev, "Unsupported pixfmt %08X\n",
> +				pixfmt);
> +			return -EINVAL;
> +		};
> +
> +		reg_num_cur++;
> +		if (reg_num_cur >= reg_num[reg_base_cur]) {
> +			reg_base_cur++;
> +			reg_num_cur = 0;
> +		}
> +	}
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL_GPL(amvdec_set_canvases);
> +
> +void amvdec_dst_buf_done(struct amvdec_session *sess,
> +			 struct vb2_v4l2_buffer *vbuf, u32 field)
> +{
> +	struct device *dev = sess->core->dev_dec;
> +	struct amvdec_timestamp *tmp;
> +	struct list_head *timestamps = &sess->timestamps;
> +	u32 output_size = amvdec_get_output_size(sess);
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&sess->ts_spinlock, flags);
> +	if (list_empty(timestamps)) {
> +		dev_err(dev, "Buffer %u done but list is empty\n",
> +			vbuf->vb2_buf.index);
> +
> +		v4l2_m2m_buf_done(vbuf, VB2_BUF_STATE_ERROR);
> +		amvdec_abort(sess);
> +		spin_unlock_irqrestore(&sess->ts_spinlock, flags);
> +		goto end;
> +	}
> +
> +	tmp = list_first_entry(timestamps, struct amvdec_timestamp, list);
> +
> +	switch (sess->pixfmt_cap) {
> +	case V4L2_PIX_FMT_NV12M:
> +		vbuf->vb2_buf.planes[0].bytesused = output_size;
> +		vbuf->vb2_buf.planes[1].bytesused = output_size / 2;
> +		break;
> +	case V4L2_PIX_FMT_YUV420M:
> +		vbuf->vb2_buf.planes[0].bytesused = output_size;
> +		vbuf->vb2_buf.planes[1].bytesused = output_size / 4;
> +		vbuf->vb2_buf.planes[2].bytesused = output_size / 4;
> +		break;
> +	}
> +	vbuf->vb2_buf.timestamp = tmp->ts;
> +	vbuf->sequence = sess->sequence_cap++;
> +
> +	list_del(&tmp->list);
> +	kfree(tmp);
> +	spin_unlock_irqrestore(&sess->ts_spinlock, flags);
> +
> +	atomic_dec(&sess->esparser_queued_bufs);
> +
> +	if (sess->should_stop && list_empty(timestamps)) {
> +		const struct v4l2_event ev = { .type = V4L2_EVENT_EOS };
> +
> +		dev_dbg(dev, "Signaling EOS\n");
> +		v4l2_event_queue_fh(&sess->fh, &ev);
> +		vbuf->flags |= V4L2_BUF_FLAG_LAST;
> +	} else if (sess->should_stop)
> +		dev_dbg(dev, "should_stop, %u bufs remain\n",
> +			atomic_read(&sess->esparser_queued_bufs));
> +
> +	vbuf->field = field;
> +	v4l2_m2m_buf_done(vbuf, VB2_BUF_STATE_DONE);
> +
> +end:
> +	/* Buffer done probably means the vififo got freed */
> +	schedule_work(&sess->esparser_queue_work);
> +}
> +EXPORT_SYMBOL_GPL(amvdec_dst_buf_done);
> +
> +void
> +amvdec_dst_buf_done_idx(struct amvdec_session *sess, u32 buf_idx, u32 field)
> +{
> +	struct vb2_v4l2_buffer *vbuf;
> +	struct device *dev = sess->core->dev_dec;
> +
> +	vbuf = v4l2_m2m_dst_buf_remove_by_idx(sess->m2m_ctx, buf_idx);
> +	if (!vbuf) {
> +		dev_err(dev,
> +			"Buffer %u done but it doesn't exist in m2m_ctx\n",
> +			buf_idx);
> +		amvdec_rm_first_ts(sess);
> +		return;
> +	}
> +
> +	amvdec_dst_buf_done(sess, vbuf, field);
> +}
> +EXPORT_SYMBOL_GPL(amvdec_dst_buf_done_idx);
> +
> +void amvdec_add_ts_reorder(struct amvdec_session *sess, u64 ts)
> +{
> +	struct amvdec_timestamp *new_ts, *tmp;
> +	unsigned long flags;
> +
> +	new_ts = kmalloc(sizeof(*new_ts), GFP_KERNEL);
> +	new_ts->ts = ts;
> +
> +	spin_lock_irqsave(&sess->ts_spinlock, flags);
> +
> +	if (list_empty(&sess->timestamps))
> +		goto add_tail;
> +
> +	list_for_each_entry(tmp, &sess->timestamps, list) {
> +		if (ts < tmp->ts) {
> +			list_add_tail(&new_ts->list, &tmp->list);
> +			goto unlock;
> +		}
> +	}
> +
> +add_tail:
> +	list_add_tail(&new_ts->list, &sess->timestamps);
> +unlock:
> +	spin_unlock_irqrestore(&sess->ts_spinlock, flags);
> +}
> +EXPORT_SYMBOL_GPL(amvdec_add_ts_reorder);
> +
> +void amvdec_remove_ts(struct amvdec_session *sess, u64 ts)
> +{
> +	struct amvdec_timestamp *tmp;
> +	unsigned long flags;
> +
> +	spin_lock_irqsave(&sess->ts_spinlock, flags);
> +	list_for_each_entry(tmp, &sess->timestamps, list) {
> +		if (tmp->ts == ts) {
> +			list_del(&tmp->list);
> +			kfree(tmp);
> +			goto unlock;
> +		}
> +	}
> +	dev_warn(sess->core->dev_dec,
> +		 "Couldn't remove buffer with timestamp %llu from list\n", ts);
> +
> +unlock:
> +	spin_unlock_irqrestore(&sess->ts_spinlock, flags);
> +}
> +EXPORT_SYMBOL_GPL(amvdec_remove_ts);
> +
> +void amvdec_rm_first_ts(struct amvdec_session *sess)
> +{
> +	unsigned long flags;
> +	struct amvdec_buffer *tmp;
> +	struct device *dev = sess->core->dev_dec;
> +
> +	spin_lock_irqsave(&sess->ts_spinlock, flags);
> +	if (list_empty(&sess->timestamps)) {
> +		dev_err(dev, "Can't rm first timestamp: list empty\n");
> +		goto unlock;
> +	}
> +
> +	tmp = list_first_entry(&sess->timestamps, struct amvdec_buffer, list);
> +	list_del(&tmp->list);
> +	kfree(tmp);
> +	atomic_dec(&sess->esparser_queued_bufs);
> +
> +unlock:
> +	spin_unlock_irqrestore(&sess->ts_spinlock, flags);
> +}
> +
> +void amvdec_abort(struct amvdec_session *sess)
> +{
> +	dev_info(sess->core->dev, "Aborting decoding session!\n");
> +	vb2_queue_error(&sess->m2m_ctx->cap_q_ctx.q);
> +	vb2_queue_error(&sess->m2m_ctx->out_q_ctx.q);
> +}
> +EXPORT_SYMBOL_GPL(amvdec_abort);
> diff --git a/drivers/media/platform/meson/vdec/vdec_helpers.h b/drivers/media/platform/meson/vdec/vdec_helpers.h
> new file mode 100644
> index 000000000000..352c6b4c4b84
> --- /dev/null
> +++ b/drivers/media/platform/meson/vdec/vdec_helpers.h
> @@ -0,0 +1,45 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * Copyright (C) 2018 BayLibre, SAS
> + * Author: Maxime Jourdan <[e-mail]>
> + */
> +
> +#ifndef __MESON_VDEC_HELPERS_H_
> +#define __MESON_VDEC_HELPERS_H_
> +
> +#include "vdec.h"
> +
> +/**
> + * amvdec_set_canvases() - Map VB2 buffers to canvases
> + *
> + * @sess: current session
> + * @reg_base: Registry bases of where to write the canvas indexes
> + * @reg_num: number of contiguous registers after each reg_base (including it)
> + */
> +int amvdec_set_canvases(struct amvdec_session *sess,
> +			u32 reg_base[], u32 reg_num[]);
> +
> +u32 amvdec_read_dos(struct amvdec_core *core, u32 reg);
> +void amvdec_write_dos(struct amvdec_core *core, u32 reg, u32 val);
> +void amvdec_write_dos_bits(struct amvdec_core *core, u32 reg, u32 val);
> +void amvdec_clear_dos_bits(struct amvdec_core *core, u32 reg, u32 val);
> +u32 amvdec_read_parser(struct amvdec_core *core, u32 reg);
> +void amvdec_write_parser(struct amvdec_core *core, u32 reg, u32 val);
> +
> +void amvdec_dst_buf_done_idx(struct amvdec_session *sess, u32 buf_idx,
> +			     u32 field);
> +void amvdec_dst_buf_done(struct amvdec_session *sess,
> +			 struct vb2_v4l2_buffer *vbuf, u32 field);
> +
> +/**
> + * amvdec_add_ts_reorder() - Add a timestamp to the list in chronological order
> + *
> + * @sess: current session
> + * @ts: timestamp to add
> + */
> +void amvdec_add_ts_reorder(struct amvdec_session *sess, u64 ts);
> +void amvdec_remove_ts(struct amvdec_session *sess, u64 ts);
> +void amvdec_rm_first_ts(struct amvdec_session *sess);
> +
> +void amvdec_abort(struct amvdec_session *sess);
> +#endif
> diff --git a/drivers/media/platform/meson/vdec/vdec_platform.c b/drivers/media/platform/meson/vdec/vdec_platform.c
> new file mode 100644
> index 000000000000..46eeb7426f54
> --- /dev/null
> +++ b/drivers/media/platform/meson/vdec/vdec_platform.c
> @@ -0,0 +1,101 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2018 BayLibre, SAS
> + * Author: Maxime Jourdan <[e-mail]>
> + */
> +
> +#include "vdec_platform.h"
> +#include "vdec.h"
> +
> +#include "vdec_1.h"
> +#include "codec_mpeg12.h"
> +
> +static const struct amvdec_format vdec_formats_gxbb[] = {
> +	{
> +		.pixfmt = V4L2_PIX_FMT_MPEG1,
> +		.min_buffers = 8,
> +		.max_buffers = 8,
> +		.max_width = 1920,
> +		.max_height = 1080,
> +		.vdec_ops = &vdec_1_ops,
> +		.codec_ops = &codec_mpeg12_ops,
> +		.firmware_path = "meson/gx/vmpeg12_mc",
> +		.pixfmts_cap = { V4L2_PIX_FMT_NV12M, V4L2_PIX_FMT_YUV420M, 0 },
> +	}, {
> +		.pixfmt = V4L2_PIX_FMT_MPEG2,
> +		.min_buffers = 8,
> +		.max_buffers = 8,
> +		.max_width = 1920,
> +		.max_height = 1080,
> +		.vdec_ops = &vdec_1_ops,
> +		.codec_ops = &codec_mpeg12_ops,
> +		.firmware_path = "meson/gx/vmpeg12_mc",
> +		.pixfmts_cap = { V4L2_PIX_FMT_NV12M, V4L2_PIX_FMT_YUV420M, 0 },
> +	},
> +};
> +
> +static const struct amvdec_format vdec_formats_gxl[] = {
> +	{
> +		.pixfmt = V4L2_PIX_FMT_MPEG1,
> +		.min_buffers = 8,
> +		.max_buffers = 8,
> +		.max_width = 1920,
> +		.max_height = 1080,
> +		.vdec_ops = &vdec_1_ops,
> +		.codec_ops = &codec_mpeg12_ops,
> +		.firmware_path = "meson/gx/vmpeg12_mc",
> +		.pixfmts_cap = { V4L2_PIX_FMT_NV12M, V4L2_PIX_FMT_YUV420M, 0 },
> +	}, {
> +		.pixfmt = V4L2_PIX_FMT_MPEG2,
> +		.min_buffers = 8,
> +		.max_buffers = 8,
> +		.max_width = 1920,
> +		.max_height = 1080,
> +		.vdec_ops = &vdec_1_ops,
> +		.codec_ops = &codec_mpeg12_ops,
> +		.firmware_path = "meson/gx/vmpeg12_mc",
> +		.pixfmts_cap = { V4L2_PIX_FMT_NV12M, V4L2_PIX_FMT_YUV420M, 0 },
> +	},
> +};
> +
> +static const struct amvdec_format vdec_formats_gxm[] = {
> +	{
> +		.pixfmt = V4L2_PIX_FMT_MPEG1,
> +		.min_buffers = 8,
> +		.max_buffers = 8,
> +		.max_width = 1920,
> +		.max_height = 1080,
> +		.vdec_ops = &vdec_1_ops,
> +		.codec_ops = &codec_mpeg12_ops,
> +		.firmware_path = "meson/gx/vmpeg12_mc",
> +		.pixfmts_cap = { V4L2_PIX_FMT_NV12M, V4L2_PIX_FMT_YUV420M, 0 },
> +	}, {
> +		.pixfmt = V4L2_PIX_FMT_MPEG2,
> +		.min_buffers = 8,
> +		.max_buffers = 8,
> +		.max_width = 1920,
> +		.max_height = 1080,
> +		.vdec_ops = &vdec_1_ops,
> +		.codec_ops = &codec_mpeg12_ops,
> +		.firmware_path = "meson/gx/vmpeg12_mc",
> +		.pixfmts_cap = { V4L2_PIX_FMT_NV12M, V4L2_PIX_FMT_YUV420M, 0 },
> +	},
> +};
> +
> +const struct vdec_platform vdec_platform_gxbb = {
> +	.formats = vdec_formats_gxbb,
> +	.num_formats = ARRAY_SIZE(vdec_formats_gxbb),
> +	.revision = VDEC_REVISION_GXBB,
> +};
> +
> +const struct vdec_platform vdec_platform_gxl = {
> +	.formats = vdec_formats_gxl,
> +	.num_formats = ARRAY_SIZE(vdec_formats_gxl),
> +	.revision = VDEC_REVISION_GXL,
> +};
> +
> +const struct vdec_platform vdec_platform_gxm = {
> +	.formats = vdec_formats_gxm,
> +	.num_formats = ARRAY_SIZE(vdec_formats_gxm),
> +	.revision = VDEC_REVISION_GXM,
> +};
> diff --git a/drivers/media/platform/meson/vdec/vdec_platform.h b/drivers/media/platform/meson/vdec/vdec_platform.h
> new file mode 100644
> index 000000000000..f6025326db1d
> --- /dev/null
> +++ b/drivers/media/platform/meson/vdec/vdec_platform.h
> @@ -0,0 +1,30 @@
> +/* SPDX-License-Identifier: GPL-2.0+ */
> +/*
> + * Copyright (C) 2018 BayLibre, SAS
> + * Author: Maxime Jourdan <[e-mail]>
> + */
> +
> +#ifndef __MESON_VDEC_PLATFORM_H_
> +#define __MESON_VDEC_PLATFORM_H_
> +
> +#include "vdec.h"
> +
> +struct amvdec_format;
> +
> +enum vdec_revision {
> +	VDEC_REVISION_GXBB,
> +	VDEC_REVISION_GXL,
> +	VDEC_REVISION_GXM,
> +};
> +
> +struct vdec_platform {
> +	const struct amvdec_format *formats;
> +	const u32 num_formats;
> +	enum vdec_revision revision;
> +};
> +
> +extern const struct vdec_platform vdec_platform_gxbb;
> +extern const struct vdec_platform vdec_platform_gxm;
> +extern const struct vdec_platform vdec_platform_gxl;
> +
> +#endif
> 

Regards,

	Hans

Patch

diff --git a/drivers/media/platform/Kconfig b/drivers/media/platform/Kconfig
index 2728376b04b5..1c33d95dd92f 100644
--- a/drivers/media/platform/Kconfig
+++ b/drivers/media/platform/Kconfig
@@ -482,6 +482,16 @@  config VIDEO_QCOM_VENUS
 	  on various Qualcomm SoCs.
 	  To compile this driver as a module choose m here.
 
+config VIDEO_MESON_VDEC
+	tristate "Amlogic video decoder driver"
+	depends on VIDEO_DEV && VIDEO_V4L2 && HAS_DMA
+	depends on (ARCH_MESON) || COMPILE_TEST
+	select VIDEOBUF2_DMA_CONTIG
+	select V4L2_MEM2MEM_DEV
+	select MESON_CANVAS
+	help
+	Support for the video decoder found in gxbb/gxl/gxm chips.
+
 endif # V4L_MEM2MEM_DRIVERS
 
 # TI VIDEO PORT Helper Modules
diff --git a/drivers/media/platform/meson/Makefile b/drivers/media/platform/meson/Makefile
index 597beb8f34d1..f7c6e1031f25 100644
--- a/drivers/media/platform/meson/Makefile
+++ b/drivers/media/platform/meson/Makefile
@@ -1 +1,2 @@ 
 obj-$(CONFIG_VIDEO_MESON_AO_CEC)	+= ao-cec.o
+obj-$(CONFIG_VIDEO_MESON_VDEC)	+= vdec/
diff --git a/drivers/media/platform/meson/vdec/Makefile b/drivers/media/platform/meson/vdec/Makefile
new file mode 100644
index 000000000000..6bea129084b7
--- /dev/null
+++ b/drivers/media/platform/meson/vdec/Makefile
@@ -0,0 +1,8 @@ 
+# SPDX-License-Identifier: GPL-2.0
+# Makefile for Amlogic meson video decoder driver
+
+meson-vdec-objs = esparser.o vdec.o vdec_helpers.o vdec_platform.o
+meson-vdec-objs += vdec_1.o
+meson-vdec-objs += codec_mpeg12.o
+
+obj-$(CONFIG_VIDEO_MESON_VDEC) += meson-vdec.o
diff --git a/drivers/media/platform/meson/vdec/codec_mpeg12.c b/drivers/media/platform/meson/vdec/codec_mpeg12.c
new file mode 100644
index 000000000000..18709319cff7
--- /dev/null
+++ b/drivers/media/platform/meson/vdec/codec_mpeg12.c
@@ -0,0 +1,170 @@ 
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 BayLibre, SAS
+ * Author: Maxime Jourdan <[e-mail]>
+ */
+
+#include <media/v4l2-mem2mem.h>
+#include <media/videobuf2-dma-contig.h>
+
+#include "vdec_helpers.h"
+#include "dos_regs.h"
+
+#define SIZE_WORKSPACE		SZ_128K
+/* Offset substracted by the firmware from the workspace paddr */
+#define WORKSPACE_OFFSET	(5 * SZ_1K)
+
+/* map firmware registers to known MPEG1/2 functions */
+#define MREG_SEQ_INFO		AV_SCRATCH_4
+#define MREG_PIC_INFO		AV_SCRATCH_5
+#define MREG_PIC_WIDTH		AV_SCRATCH_6
+#define MREG_PIC_HEIGHT		AV_SCRATCH_7
+#define MREG_BUFFERIN		AV_SCRATCH_8
+#define MREG_BUFFEROUT		AV_SCRATCH_9
+#define MREG_CMD		AV_SCRATCH_A
+#define MREG_CO_MV_START	AV_SCRATCH_B
+#define MREG_ERROR_COUNT	AV_SCRATCH_C
+#define MREG_FRAME_OFFSET	AV_SCRATCH_D
+#define MREG_WAIT_BUFFER	AV_SCRATCH_E
+#define MREG_FATAL_ERROR	AV_SCRATCH_F
+
+#define PICINFO_PROG		0x00008000
+#define PICINFO_TOP_FIRST	0x00002000
+
+struct codec_mpeg12 {
+	/* Buffer for the MPEG1/2 Workspace */
+	void	  *workspace_vaddr;
+	dma_addr_t workspace_paddr;
+};
+
+static int codec_mpeg12_can_recycle(struct amvdec_core *core)
+{
+	return !amvdec_read_dos(core, MREG_BUFFERIN);
+}
+
+static void codec_mpeg12_recycle(struct amvdec_core *core, u32 buf_idx)
+{
+	amvdec_write_dos(core, MREG_BUFFERIN, buf_idx + 1);
+}
+
+static int codec_mpeg12_start(struct amvdec_session *sess)
+{
+	struct amvdec_core *core = sess->core;
+	struct codec_mpeg12 *mpeg12 = sess->priv;
+	int ret;
+
+	mpeg12 = kzalloc(sizeof(*mpeg12), GFP_KERNEL);
+	if (!mpeg12)
+		return -ENOMEM;
+
+	/* Allocate some memory for the MPEG1/2 decoder's state */
+	mpeg12->workspace_vaddr = dma_alloc_coherent(core->dev, SIZE_WORKSPACE,
+						     &mpeg12->workspace_paddr,
+						     GFP_KERNEL);
+	if (!mpeg12->workspace_vaddr) {
+		dev_err(core->dev, "Failed to request MPEG 1/2 Workspace\n");
+		ret = -ENOMEM;
+		goto free_mpeg12;
+	}
+
+	ret = amvdec_set_canvases(sess, (u32[]){ AV_SCRATCH_0, 0 },
+					(u32[]){ 8, 0 });
+	if (ret)
+		goto free_workspace;
+
+	amvdec_write_dos(core, POWER_CTL_VLD, BIT(4));
+	amvdec_write_dos(core, MREG_CO_MV_START,
+			 mpeg12->workspace_paddr + WORKSPACE_OFFSET);
+
+	amvdec_write_dos(core, MPEG1_2_REG, 0);
+	amvdec_write_dos(core, PSCALE_CTRL, 0);
+	amvdec_write_dos(core, PIC_HEAD_INFO, 0x380);
+	amvdec_write_dos(core, M4_CONTROL_REG, 0);
+	amvdec_write_dos(core, MREG_BUFFERIN, 0);
+	amvdec_write_dos(core, MREG_BUFFEROUT, 0);
+	amvdec_write_dos(core, MREG_CMD, (sess->width << 16) | sess->height);
+	amvdec_write_dos(core, MREG_ERROR_COUNT, 0);
+	amvdec_write_dos(core, MREG_FATAL_ERROR, 0);
+	amvdec_write_dos(core, MREG_WAIT_BUFFER, 0);
+
+	sess->keyframe_found = 1;
+	sess->priv = mpeg12;
+
+	return 0;
+
+free_workspace:
+	dma_free_coherent(core->dev, SIZE_WORKSPACE, mpeg12->workspace_vaddr,
+			  mpeg12->workspace_paddr);
+free_mpeg12:
+	kfree(mpeg12);
+
+	return ret;
+}
+
+static int codec_mpeg12_stop(struct amvdec_session *sess)
+{
+	struct codec_mpeg12 *mpeg12 = sess->priv;
+	struct amvdec_core *core = sess->core;
+
+	if (mpeg12->workspace_vaddr)
+		dma_free_coherent(core->dev, SIZE_WORKSPACE,
+				  mpeg12->workspace_vaddr,
+				  mpeg12->workspace_paddr);
+
+	return 0;
+}
+
+static irqreturn_t codec_mpeg12_threaded_isr(struct amvdec_session *sess)
+{
+	struct amvdec_core *core = sess->core;
+	u32 reg;
+	u32 pic_info;
+	u32 is_progressive;
+	u32 buffer_index;
+	u32 field = V4L2_FIELD_NONE;
+
+	amvdec_write_dos(core, ASSIST_MBOX1_CLR_REG, 1);
+	reg = amvdec_read_dos(core, MREG_FATAL_ERROR);
+	if (reg == 1) {
+		dev_err(core->dev, "MPEG1/2 fatal error\n");
+		amvdec_abort(sess);
+		return IRQ_HANDLED;
+	}
+
+	reg = amvdec_read_dos(core, MREG_BUFFEROUT);
+	if (!reg)
+		return IRQ_HANDLED;
+
+	/* Unclear what this means */
+	if ((reg & GENMASK(23, 17)) == GENMASK(23, 17))
+		goto end;
+
+	pic_info = amvdec_read_dos(core, MREG_PIC_INFO);
+	is_progressive = pic_info & PICINFO_PROG;
+
+	if (!is_progressive)
+		field = (pic_info & PICINFO_TOP_FIRST) ?
+			V4L2_FIELD_INTERLACED_TB :
+			V4L2_FIELD_INTERLACED_BT;
+
+	buffer_index = ((reg & 0xf) - 1) & 7;
+	amvdec_dst_buf_done_idx(sess, buffer_index, field);
+
+end:
+	amvdec_write_dos(core, MREG_BUFFEROUT, 0);
+	return IRQ_HANDLED;
+}
+
+static irqreturn_t codec_mpeg12_isr(struct amvdec_session *sess)
+{
+	return IRQ_WAKE_THREAD;
+}
+
+struct amvdec_codec_ops codec_mpeg12_ops = {
+	.start = codec_mpeg12_start,
+	.stop = codec_mpeg12_stop,
+	.isr = codec_mpeg12_isr,
+	.threaded_isr = codec_mpeg12_threaded_isr,
+	.can_recycle = codec_mpeg12_can_recycle,
+	.recycle = codec_mpeg12_recycle,
+};
diff --git a/drivers/media/platform/meson/vdec/codec_mpeg12.h b/drivers/media/platform/meson/vdec/codec_mpeg12.h
new file mode 100644
index 000000000000..43cab5f39ca0
--- /dev/null
+++ b/drivers/media/platform/meson/vdec/codec_mpeg12.h
@@ -0,0 +1,14 @@ 
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2018 BayLibre, SAS
+ * Author: Maxime Jourdan <[e-mail]>
+ */
+
+#ifndef __MESON_VDEC_CODEC_MPEG12_H_
+#define __MESON_VDEC_CODEC_MPEG12_H_
+
+#include "vdec.h"
+
+extern struct amvdec_codec_ops codec_mpeg12_ops;
+
+#endif
diff --git a/drivers/media/platform/meson/vdec/dos_regs.h b/drivers/media/platform/meson/vdec/dos_regs.h
new file mode 100644
index 000000000000..abd810542dbb
--- /dev/null
+++ b/drivers/media/platform/meson/vdec/dos_regs.h
@@ -0,0 +1,98 @@ 
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2018 BayLibre, SAS
+ * Author: Maxime Jourdan <[e-mail]>
+ */
+
+#ifndef __MESON_VDEC_DOS_REGS_H_
+#define __MESON_VDEC_DOS_REGS_H_
+
+/* DOS registers */
+#define VDEC_ASSIST_AMR1_INT8	0x00b4
+
+#define ASSIST_MBOX1_CLR_REG	0x01d4
+#define ASSIST_MBOX1_MASK	0x01d8
+
+#define MPSR			0x0c04
+#define MCPU_INTR_MSK		0x0c10
+#define CPSR			0x0c84
+
+#define IMEM_DMA_CTRL		0x0d00
+#define IMEM_DMA_ADR		0x0d04
+#define IMEM_DMA_COUNT		0x0d08
+#define LMEM_DMA_CTRL		0x0d40
+
+#define MC_STATUS0		0x2424
+#define MC_CTRL1		0x242c
+
+#define PSCALE_RST		0x2440
+#define PSCALE_CTRL		0x2444
+#define PSCALE_BMEM_ADDR	0x247c
+#define PSCALE_BMEM_DAT		0x2480
+
+#define DBLK_CTRL		0x2544
+#define DBLK_STATUS		0x254c
+
+#define GCLK_EN			0x260c
+#define MDEC_PIC_DC_CTRL	0x2638
+#define MDEC_PIC_DC_STATUS	0x263c
+#define ANC0_CANVAS_ADDR	0x2640
+#define MDEC_PIC_DC_THRESH	0x26e0
+
+/* Firmware interface registers */
+#define AV_SCRATCH_0		0x2700
+#define AV_SCRATCH_1		0x2704
+#define AV_SCRATCH_2		0x2708
+#define AV_SCRATCH_3		0x270c
+#define AV_SCRATCH_4		0x2710
+#define AV_SCRATCH_5		0x2714
+#define AV_SCRATCH_6		0x2718
+#define AV_SCRATCH_7		0x271c
+#define AV_SCRATCH_8		0x2720
+#define AV_SCRATCH_9		0x2724
+#define AV_SCRATCH_A		0x2728
+#define AV_SCRATCH_B		0x272c
+#define AV_SCRATCH_C		0x2730
+#define AV_SCRATCH_D		0x2734
+#define AV_SCRATCH_E		0x2738
+#define AV_SCRATCH_F		0x273c
+#define AV_SCRATCH_G		0x2740
+#define AV_SCRATCH_H		0x2744
+#define AV_SCRATCH_I		0x2748
+#define AV_SCRATCH_J		0x274c
+#define AV_SCRATCH_K		0x2750
+#define AV_SCRATCH_L		0x2754
+
+#define MPEG1_2_REG		0x3004
+#define PIC_HEAD_INFO		0x300c
+#define POWER_CTL_VLD		0x3020
+#define M4_CONTROL_REG		0x30a4
+
+/* Stream Buffer (stbuf) regs */
+#define VLD_MEM_VIFIFO_START_PTR	0x3100
+#define VLD_MEM_VIFIFO_CURR_PTR	0x3104
+#define VLD_MEM_VIFIFO_END_PTR	0x3108
+#define VLD_MEM_VIFIFO_CONTROL	0x3110
+	#define MEM_FIFO_CNT_BIT	16
+	#define MEM_FILL_ON_LEVEL	BIT(10)
+	#define MEM_CTRL_EMPTY_EN	BIT(2)
+	#define MEM_CTRL_FILL_EN	BIT(1)
+#define VLD_MEM_VIFIFO_WP	0x3114
+#define VLD_MEM_VIFIFO_RP	0x3118
+#define VLD_MEM_VIFIFO_LEVEL	0x311c
+#define VLD_MEM_VIFIFO_BUF_CNTL	0x3120
+	#define MEM_BUFCTRL_MANUAL	BIT(1)
+#define VLD_MEM_VIFIFO_WRAP_COUNT	0x3144
+
+#define DCAC_DMA_CTRL		0x3848
+
+#define DOS_SW_RESET0		0xfc00
+#define DOS_GCLK_EN0		0xfc04
+#define DOS_GEN_CTRL0		0xfc08
+#define DOS_MEM_PD_VDEC		0xfcc0
+#define DOS_MEM_PD_HEVC		0xfccc
+#define DOS_SW_RESET3		0xfcd0
+#define DOS_GCLK_EN3		0xfcd4
+#define DOS_VDEC_MCRCC_STALL_CTRL	0xfd00
+
+#endif
diff --git a/drivers/media/platform/meson/vdec/esparser.c b/drivers/media/platform/meson/vdec/esparser.c
new file mode 100644
index 000000000000..098c7d76ad3f
--- /dev/null
+++ b/drivers/media/platform/meson/vdec/esparser.c
@@ -0,0 +1,368 @@ 
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 BayLibre, SAS
+ * Author: Maxime Jourdan <[e-mail]>
+ *
+ * The Elementary Stream Parser is a HW bitstream parser.
+ * It reads bitstream buffers and feeds them to the VIFIFO
+ */
+
+#include <linux/init.h>
+#include <linux/ioctl.h>
+#include <linux/list.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/platform_device.h>
+#include <linux/reset.h>
+#include <media/videobuf2-dma-contig.h>
+#include <media/v4l2-mem2mem.h>
+
+#include "dos_regs.h"
+#include "esparser.h"
+#include "vdec_helpers.h"
+
+/* PARSER REGS (CBUS) */
+#define PARSER_CONTROL 0x00
+	#define ES_PACK_SIZE_BIT	8
+	#define ES_WRITE		BIT(5)
+	#define ES_SEARCH		BIT(1)
+	#define ES_PARSER_START		BIT(0)
+#define PARSER_FETCH_ADDR	0x4
+#define PARSER_FETCH_CMD	0x8
+#define PARSER_CONFIG 0x14
+	#define PS_CFG_MAX_FETCH_CYCLE_BIT	0
+	#define PS_CFG_STARTCODE_WID_24_BIT	10
+	#define PS_CFG_MAX_ES_WR_CYCLE_BIT	12
+	#define PS_CFG_PFIFO_EMPTY_CNT_BIT	16
+#define PFIFO_WR_PTR 0x18
+#define PFIFO_RD_PTR 0x1c
+#define PARSER_SEARCH_PATTERN 0x24
+	#define ES_START_CODE_PATTERN 0x00000100
+#define PARSER_SEARCH_MASK 0x28
+	#define ES_START_CODE_MASK	0xffffff00
+	#define FETCH_ENDIAN_BIT	27
+#define PARSER_INT_ENABLE	0x2c
+	#define PARSER_INT_HOST_EN_BIT	8
+#define PARSER_INT_STATUS	0x30
+	#define PARSER_INTSTAT_SC_FOUND	1
+#define PARSER_ES_CONTROL	0x5c
+#define PARSER_VIDEO_START_PTR	0x80
+#define PARSER_VIDEO_END_PTR	0x84
+#define PARSER_VIDEO_HOLE	0x90
+
+#define SEARCH_PATTERN_LEN	512
+#define MIN_PACKET_SIZE		(4 * SZ_1K)
+
+/* Buffer to send to the ESPARSER to signal End Of Stream.
+ * Credits to Endless Mobile.
+ */
+#define EOS_TAIL_BUF_SIZE 1024
+static const u8 eos_tail_data[EOS_TAIL_BUF_SIZE] = {
+	0x00, 0x00, 0x00, 0x01, 0x06, 0x05, 0xff, 0xe4, 0xdc, 0x45, 0xe9, 0xbd,
+	0xe6, 0xd9, 0x48, 0xb7,	0x96, 0x2c, 0xd8, 0x20, 0xd9, 0x23, 0xee, 0xef,
+	0x78, 0x32, 0x36, 0x34, 0x20, 0x2d, 0x20, 0x63,	0x6f, 0x72, 0x65, 0x20,
+	0x36, 0x37, 0x20, 0x72, 0x31, 0x31, 0x33, 0x30, 0x20, 0x38, 0x34, 0x37,
+	0x35, 0x39, 0x37, 0x37, 0x20, 0x2d, 0x20, 0x48, 0x2e, 0x32, 0x36, 0x34,
+	0x2f, 0x4d, 0x50, 0x45,	0x47, 0x2d, 0x34, 0x20, 0x41, 0x56, 0x43, 0x20,
+	0x63, 0x6f, 0x64, 0x65, 0x63, 0x20, 0x2d, 0x20,	0x43, 0x6f, 0x70, 0x79,
+	0x6c, 0x65, 0x66, 0x74, 0x20, 0x32, 0x30, 0x30, 0x33, 0x2d, 0x32, 0x30,
+	0x30, 0x39, 0x20, 0x2d, 0x20, 0x68, 0x74, 0x74, 0x70, 0x3a, 0x2f, 0x2f,
+	0x77, 0x77, 0x77, 0x2e,	0x76, 0x69, 0x64, 0x65, 0x6f, 0x6c, 0x61, 0x6e,
+	0x2e, 0x6f, 0x72, 0x67, 0x2f, 0x78, 0x32, 0x36,	0x34, 0x2e, 0x68, 0x74,
+	0x6d, 0x6c, 0x20, 0x2d, 0x20, 0x6f, 0x70, 0x74, 0x69, 0x6f, 0x6e, 0x73,
+	0x3a, 0x20, 0x63, 0x61, 0x62, 0x61, 0x63, 0x3d, 0x31, 0x20, 0x72, 0x65,
+	0x66, 0x3d, 0x31, 0x20,	0x64, 0x65, 0x62, 0x6c, 0x6f, 0x63, 0x6b, 0x3d,
+	0x31, 0x3a, 0x30, 0x3a, 0x30, 0x20, 0x61, 0x6e,	0x61, 0x6c, 0x79, 0x73,
+	0x65, 0x3d, 0x30, 0x78, 0x31, 0x3a, 0x30, 0x78, 0x31, 0x31, 0x31, 0x20,
+	0x6d, 0x65, 0x3d, 0x68, 0x65, 0x78, 0x20, 0x73, 0x75, 0x62, 0x6d, 0x65,
+	0x3d, 0x36, 0x20, 0x70,	0x73, 0x79, 0x5f, 0x72, 0x64, 0x3d, 0x31, 0x2e,
+	0x30, 0x3a, 0x30, 0x2e, 0x30, 0x20, 0x6d, 0x69,	0x78, 0x65, 0x64, 0x5f,
+	0x72, 0x65, 0x66, 0x3d, 0x30, 0x20, 0x6d, 0x65, 0x5f, 0x72, 0x61, 0x6e,
+	0x67, 0x65, 0x3d, 0x31, 0x36, 0x20, 0x63, 0x68, 0x72, 0x6f, 0x6d, 0x61,
+	0x5f, 0x6d, 0x65, 0x3d,	0x31, 0x20, 0x74, 0x72, 0x65, 0x6c, 0x6c, 0x69,
+	0x73, 0x3d, 0x30, 0x20, 0x38, 0x78, 0x38, 0x64,	0x63, 0x74, 0x3d, 0x30,
+	0x20, 0x63, 0x71, 0x6d, 0x3d, 0x30, 0x20, 0x64, 0x65, 0x61, 0x64, 0x7a,
+	0x6f, 0x6e, 0x65, 0x3d, 0x32, 0x31, 0x2c, 0x31, 0x31, 0x20, 0x63, 0x68,
+	0x72, 0x6f, 0x6d, 0x61,	0x5f, 0x71, 0x70, 0x5f, 0x6f, 0x66, 0x66, 0x73,
+	0x65, 0x74, 0x3d, 0x2d, 0x32, 0x20, 0x74, 0x68,	0x72, 0x65, 0x61, 0x64,
+	0x73, 0x3d, 0x31, 0x20, 0x6e, 0x72, 0x3d, 0x30, 0x20, 0x64, 0x65, 0x63,
+	0x69, 0x6d, 0x61, 0x74, 0x65, 0x3d, 0x31, 0x20, 0x6d, 0x62, 0x61, 0x66,
+	0x66, 0x3d, 0x30, 0x20,	0x62, 0x66, 0x72, 0x61, 0x6d, 0x65, 0x73, 0x3d,
+	0x30, 0x20, 0x6b, 0x65, 0x79, 0x69, 0x6e, 0x74,	0x3d, 0x32, 0x35, 0x30,
+	0x20, 0x6b, 0x65, 0x79, 0x69, 0x6e, 0x74, 0x5f, 0x6d, 0x69, 0x6e, 0x3d,
+	0x32, 0x35, 0x20, 0x73, 0x63, 0x65, 0x6e, 0x65, 0x63, 0x75, 0x74, 0x3d,
+	0x34, 0x30, 0x20, 0x72,	0x63, 0x3d, 0x61, 0x62, 0x72, 0x20, 0x62, 0x69,
+	0x74, 0x72, 0x61, 0x74, 0x65, 0x3d, 0x31, 0x30,	0x20, 0x72, 0x61, 0x74,
+	0x65, 0x74, 0x6f, 0x6c, 0x3d, 0x31, 0x2e, 0x30, 0x20, 0x71, 0x63, 0x6f,
+	0x6d, 0x70, 0x3d, 0x30, 0x2e, 0x36, 0x30, 0x20, 0x71, 0x70, 0x6d, 0x69,
+	0x6e, 0x3d, 0x31, 0x30,	0x20, 0x71, 0x70, 0x6d, 0x61, 0x78, 0x3d, 0x35,
+	0x31, 0x20, 0x71, 0x70, 0x73, 0x74, 0x65, 0x70,	0x3d, 0x34, 0x20, 0x69,
+	0x70, 0x5f, 0x72, 0x61, 0x74, 0x69, 0x6f, 0x3d, 0x31, 0x2e, 0x34, 0x30,
+	0x20, 0x61, 0x71, 0x3d, 0x31, 0x3a, 0x31, 0x2e, 0x30, 0x30, 0x00, 0x80,
+	0x00, 0x00, 0x00, 0x01,	0x67, 0x4d, 0x40, 0x0a, 0x9a, 0x74, 0xf4, 0x20,
+	0x00, 0x00, 0x03, 0x00, 0x20, 0x00, 0x00, 0x06,	0x51, 0xe2, 0x44, 0xd4,
+	0x00, 0x00, 0x00, 0x01, 0x68, 0xee, 0x32, 0xc8, 0x00, 0x00, 0x00, 0x01,
+	0x65, 0x88, 0x80, 0x20, 0x00, 0x08, 0x7f, 0xea, 0x6a, 0xe2, 0x99, 0xb6,
+	0x57, 0xae, 0x49, 0x30,	0xf5, 0xfe, 0x5e, 0x46, 0x0b, 0x72, 0x44, 0xc4,
+	0xe1, 0xfc, 0x62, 0xda, 0xf1, 0xfb, 0xa2, 0xdb,	0xd6, 0xbe, 0x5c, 0xd7,
+	0x24, 0xa3, 0xf5, 0xb9, 0x2f, 0x57, 0x16, 0x49, 0x75, 0x47, 0x77, 0x09,
+	0x5c, 0xa1, 0xb4, 0xc3, 0x4f, 0x60, 0x2b, 0xb0, 0x0c, 0xc8, 0xd6, 0x66,
+	0xba, 0x9b, 0x82, 0x29,	0x33, 0x92, 0x26, 0x99, 0x31, 0x1c, 0x7f, 0x9b
+};
+
+static DECLARE_WAIT_QUEUE_HEAD(wq);
+static int search_done;
+
+static irqreturn_t esparser_isr(int irq, void *dev)
+{
+	int int_status;
+	struct amvdec_core *core = dev;
+
+	int_status = amvdec_read_parser(core, PARSER_INT_STATUS);
+	amvdec_write_parser(core, PARSER_INT_STATUS, int_status);
+
+	if (int_status & PARSER_INTSTAT_SC_FOUND) {
+		amvdec_write_parser(core, PFIFO_RD_PTR, 0);
+		amvdec_write_parser(core, PFIFO_WR_PTR, 0);
+		search_done = 1;
+		wake_up_interruptible(&wq);
+	}
+
+	return IRQ_HANDLED;
+}
+
+/* Pad the packet to at least 4KiB bytes otherwise the VDEC unit won't trigger
+ * ISRs.
+ * Also append a start code 000001ff at the end to trigger
+ * the ESPARSER interrupt.
+ */
+static u32 esparser_pad_start_code(struct vb2_buffer *vb)
+{
+	u32 payload_size = vb2_get_plane_payload(vb, 0);
+	u32 pad_size = 0;
+	u8 *vaddr = vb2_plane_vaddr(vb, 0) + payload_size;
+
+	if (payload_size < MIN_PACKET_SIZE) {
+		pad_size = MIN_PACKET_SIZE - payload_size;
+		memset(vaddr, 0, pad_size);
+	}
+
+	memset(vaddr + pad_size, 0, SEARCH_PATTERN_LEN);
+	vaddr[pad_size]     = 0x00;
+	vaddr[pad_size + 1] = 0x00;
+	vaddr[pad_size + 2] = 0x01;
+	vaddr[pad_size + 3] = 0xff;
+
+	return pad_size;
+}
+
+static int
+esparser_write_data(struct amvdec_core *core, dma_addr_t addr, u32 size)
+{
+	amvdec_write_parser(core, PFIFO_RD_PTR, 0);
+	amvdec_write_parser(core, PFIFO_WR_PTR, 0);
+	amvdec_write_parser(core, PARSER_CONTROL,
+			    ES_WRITE |
+			    ES_PARSER_START |
+			    ES_SEARCH |
+			    (size << ES_PACK_SIZE_BIT));
+
+	amvdec_write_parser(core, PARSER_FETCH_ADDR, addr);
+	amvdec_write_parser(core, PARSER_FETCH_CMD,
+			    (7 << FETCH_ENDIAN_BIT) |
+			    (size + SEARCH_PATTERN_LEN));
+
+	search_done = 0;
+	return wait_event_interruptible_timeout(wq, search_done, (HZ / 5));
+}
+
+static u32 esparser_vififo_get_free_space(struct amvdec_session *sess)
+{
+	u32 vififo_usage;
+	struct amvdec_ops *vdec_ops = sess->fmt_out->vdec_ops;
+	struct amvdec_core *core = sess->core;
+
+	vififo_usage  = vdec_ops->vififo_level(sess);
+	vififo_usage += amvdec_read_parser(core, PARSER_VIDEO_HOLE);
+	vififo_usage += (6 * SZ_1K);
+
+	if (vififo_usage > sess->vififo_size) {
+		dev_warn(sess->core->dev,
+			 "VIFIFO usage (%u) > VIFIFO size (%u)\n",
+			 vififo_usage, sess->vififo_size);
+		return 0;
+	}
+
+	return sess->vififo_size - vififo_usage;
+}
+
+int esparser_queue_eos(struct amvdec_core *core)
+{
+	struct device *dev = core->dev;
+	void *eos_vaddr;
+	dma_addr_t eos_paddr;
+	int ret;
+
+	eos_vaddr = dma_alloc_coherent(dev,
+				       EOS_TAIL_BUF_SIZE + SEARCH_PATTERN_LEN,
+				       &eos_paddr, GFP_KERNEL);
+	if (!eos_vaddr)
+		return -ENOMEM;
+
+	memset(eos_vaddr, 0, EOS_TAIL_BUF_SIZE + SEARCH_PATTERN_LEN);
+	memcpy(eos_vaddr, eos_tail_data, sizeof(eos_tail_data));
+	ret = esparser_write_data(core, eos_paddr, EOS_TAIL_BUF_SIZE);
+	dma_free_coherent(dev, EOS_TAIL_BUF_SIZE + SEARCH_PATTERN_LEN,
+			  eos_vaddr, eos_paddr);
+
+	return ret;
+}
+
+static int
+esparser_queue(struct amvdec_session *sess, struct vb2_v4l2_buffer *vbuf)
+{
+	int ret;
+	struct vb2_buffer *vb = &vbuf->vb2_buf;
+	struct amvdec_core *core = sess->core;
+	struct amvdec_codec_ops *codec_ops = sess->fmt_out->codec_ops;
+	u32 num_dst_bufs = 0;
+	u32 payload_size = vb2_get_plane_payload(vb, 0);
+	dma_addr_t phy = vb2_dma_contig_plane_dma_addr(vb, 0);
+	u32 pad_size;
+
+	if (!payload_size) {
+		esparser_queue_eos(core);
+		return 0;
+	}
+
+	if (codec_ops->num_pending_bufs)
+		num_dst_bufs = codec_ops->num_pending_bufs(sess);
+
+	num_dst_bufs += v4l2_m2m_num_dst_bufs_ready(sess->m2m_ctx);
+
+	if (esparser_vififo_get_free_space(sess) < payload_size ||
+	    atomic_read(&sess->esparser_queued_bufs) >= num_dst_bufs)
+		return -EAGAIN;
+
+	v4l2_m2m_src_buf_remove_by_buf(sess->m2m_ctx, vbuf);
+	amvdec_add_ts_reorder(sess, vb->timestamp);
+	dev_dbg(core->dev, "esparser: Queuing ts = %llu ; pld_size = %u\n",
+		vb->timestamp, payload_size);
+
+	pad_size = esparser_pad_start_code(vb);
+	ret = esparser_write_data(core, phy, payload_size + pad_size);
+
+	if (ret > 0) {
+		/* We need to wait until we parse/decode the first keyframe.
+		 * All buffers prior to the first keyframe must be dropped.
+		 */
+		if (!sess->keyframe_found)
+			usleep_range(1000, 2000);
+
+		if (sess->keyframe_found)
+			atomic_inc(&sess->esparser_queued_bufs);
+		else
+			amvdec_remove_ts(sess, vb->timestamp);
+
+		vbuf->flags = 0;
+		vbuf->field = V4L2_FIELD_NONE;
+		v4l2_m2m_buf_done(vbuf, VB2_BUF_STATE_DONE);
+		return 0;
+	}
+
+	dev_warn(core->dev, "esparser: input parsing error\n");
+	amvdec_remove_ts(sess, vb->timestamp);
+	v4l2_m2m_buf_done(vbuf, VB2_BUF_STATE_ERROR);
+	amvdec_write_parser(core, PARSER_FETCH_CMD, 0);
+
+	return 0;
+}
+
+void esparser_queue_all_src(struct work_struct *work)
+{
+	struct v4l2_m2m_buffer *buf, *n;
+	struct amvdec_session *sess =
+		container_of(work, struct amvdec_session, esparser_queue_work);
+
+	mutex_lock(&sess->lock);
+	v4l2_m2m_for_each_src_buf_safe(sess->m2m_ctx, buf, n) {
+		if (esparser_queue(sess, &buf->vb) < 0)
+			break;
+
+		/* Some codecs don't like having data queued in too fast */
+		usleep_range(1000, 2000);
+	}
+	mutex_unlock(&sess->lock);
+}
+
+int esparser_power_up(struct amvdec_session *sess)
+{
+	struct amvdec_core *core = sess->core;
+	struct amvdec_ops *vdec_ops = sess->fmt_out->vdec_ops;
+
+	reset_control_reset(core->esparser_reset);
+	amvdec_write_parser(core, PARSER_CONFIG,
+			    (10 << PS_CFG_PFIFO_EMPTY_CNT_BIT) |
+			    (1  << PS_CFG_MAX_ES_WR_CYCLE_BIT) |
+			    (16 << PS_CFG_MAX_FETCH_CYCLE_BIT));
+
+	amvdec_write_parser(core, PFIFO_RD_PTR, 0);
+	amvdec_write_parser(core, PFIFO_WR_PTR, 0);
+
+	amvdec_write_parser(core, PARSER_SEARCH_PATTERN,
+			    ES_START_CODE_PATTERN);
+	amvdec_write_parser(core, PARSER_SEARCH_MASK, ES_START_CODE_MASK);
+
+	amvdec_write_parser(core, PARSER_CONFIG,
+			    (10 << PS_CFG_PFIFO_EMPTY_CNT_BIT) |
+			    (1  << PS_CFG_MAX_ES_WR_CYCLE_BIT) |
+			    (16 << PS_CFG_MAX_FETCH_CYCLE_BIT) |
+			    (2  << PS_CFG_STARTCODE_WID_24_BIT));
+
+	amvdec_write_parser(core, PARSER_CONTROL,
+			    (ES_SEARCH | ES_PARSER_START));
+
+	amvdec_write_parser(core, PARSER_VIDEO_START_PTR, sess->vififo_paddr);
+	amvdec_write_parser(core, PARSER_VIDEO_END_PTR,
+			    sess->vififo_paddr + sess->vififo_size - 8);
+	amvdec_write_parser(core, PARSER_ES_CONTROL,
+			    amvdec_read_parser(core, PARSER_ES_CONTROL) & ~1);
+
+	if (vdec_ops->conf_esparser)
+		vdec_ops->conf_esparser(sess);
+
+	amvdec_write_parser(core, PARSER_INT_STATUS, 0xffff);
+	amvdec_write_parser(core, PARSER_INT_ENABLE,
+			    BIT(PARSER_INT_HOST_EN_BIT));
+
+	return 0;
+}
+
+int esparser_init(struct platform_device *pdev, struct amvdec_core *core)
+{
+	struct device *dev = &pdev->dev;
+	int ret;
+	int irq;
+
+	irq = platform_get_irq(pdev, 1);
+	if (irq < 0) {
+		dev_err(dev, "Failed getting ESPARSER IRQ from dtb\n");
+		return irq;
+	}
+
+	ret = devm_request_irq(dev, irq, esparser_isr, IRQF_SHARED,
+			       "esparserirq", core);
+	if (ret) {
+		dev_err(dev, "Failed requesting ESPARSER IRQ\n");
+		return ret;
+	}
+
+	core->esparser_reset =
+		devm_reset_control_get_exclusive(dev, "esparser");
+	if (IS_ERR(core->esparser_reset)) {
+		dev_err(dev, "Failed to get esparser_reset\n");
+		return PTR_ERR(core->esparser_reset);
+	}
+
+	return 0;
+}
diff --git a/drivers/media/platform/meson/vdec/esparser.h b/drivers/media/platform/meson/vdec/esparser.h
new file mode 100644
index 000000000000..22c2ac5c6d35
--- /dev/null
+++ b/drivers/media/platform/meson/vdec/esparser.h
@@ -0,0 +1,28 @@ 
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2018 BayLibre, SAS
+ * Author: Maxime Jourdan <[e-mail]>
+ */
+
+#ifndef __MESON_VDEC_ESPARSER_H_
+#define __MESON_VDEC_ESPARSER_H_
+
+#include "vdec.h"
+
+int esparser_init(struct platform_device *pdev, struct amvdec_core *core);
+int esparser_power_up(struct amvdec_session *sess);
+
+/**
+ * esparser_queue_eos() - write End Of Stream sequence to the ESPARSER
+ *
+ * @core vdec core struct
+ */
+int esparser_queue_eos(struct amvdec_core *core);
+
+/**
+ * esparser_queue_all_src() - work handler that writes as many src buffers
+ * as possible to the ESPARSER
+ */
+void esparser_queue_all_src(struct work_struct *work);
+
+#endif
diff --git a/drivers/media/platform/meson/vdec/vdec.c b/drivers/media/platform/meson/vdec/vdec.c
new file mode 100644
index 000000000000..32e1e2228297
--- /dev/null
+++ b/drivers/media/platform/meson/vdec/vdec.c
@@ -0,0 +1,988 @@ 
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 BayLibre, SAS
+ * Author: Maxime Jourdan <[e-mail]>
+ */
+
+#include <linux/of_device.h>
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/mfd/syscon.h>
+#include <linux/slab.h>
+#include <media/v4l2-ioctl.h>
+#include <media/v4l2-event.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-mem2mem.h>
+#include <media/v4l2-dev.h>
+#include <media/videobuf2-dma-contig.h>
+
+#include "vdec.h"
+#include "esparser.h"
+#include "vdec_helpers.h"
+
+struct dummy_buf {
+	struct vb2_v4l2_buffer vb;
+	struct list_head list;
+};
+
+/* 16 MiB for parsed bitstream swap exchange */
+#define SIZE_VIFIFO SZ_16M
+
+static u32 get_output_size(u32 width, u32 height)
+{
+	return ALIGN(width * height, SZ_64K);
+}
+
+u32 amvdec_get_output_size(struct amvdec_session *sess)
+{
+	return get_output_size(sess->width, sess->height);
+}
+EXPORT_SYMBOL_GPL(amvdec_get_output_size);
+
+static int vdec_codec_needs_recycle(struct amvdec_session *sess)
+{
+	struct amvdec_codec_ops *codec_ops = sess->fmt_out->codec_ops;
+
+	return codec_ops->can_recycle && codec_ops->recycle;
+}
+
+static int vdec_recycle_thread(void *data)
+{
+	struct amvdec_session *sess = data;
+	struct amvdec_core *core = sess->core;
+	struct amvdec_codec_ops *codec_ops = sess->fmt_out->codec_ops;
+	struct amvdec_buffer *tmp, *n;
+
+	while (!kthread_should_stop()) {
+		mutex_lock(&sess->bufs_recycle_lock);
+		list_for_each_entry_safe(tmp, n, &sess->bufs_recycle, list) {
+			if (!codec_ops->can_recycle(core))
+				break;
+
+			codec_ops->recycle(core, tmp->vb->index);
+			dev_dbg(core->dev, "Buffer %d recycled\n",
+				tmp->vb->index);
+			list_del(&tmp->list);
+			kfree(tmp);
+		}
+		mutex_unlock(&sess->bufs_recycle_lock);
+
+		usleep_range(5000, 10000);
+	}
+
+	return 0;
+}
+
+static int vdec_poweron(struct amvdec_session *sess)
+{
+	int ret;
+	struct amvdec_ops *vdec_ops = sess->fmt_out->vdec_ops;
+
+	ret = clk_prepare_enable(sess->core->dos_parser_clk);
+	if (ret)
+		return ret;
+
+	ret = clk_prepare_enable(sess->core->dos_clk);
+	if (ret)
+		goto disable_dos_parser;
+
+	ret = vdec_ops->start(sess);
+	if (ret)
+		goto disable_dos;
+
+	esparser_power_up(sess);
+
+	return 0;
+
+disable_dos:
+	clk_disable_unprepare(sess->core->dos_clk);
+disable_dos_parser:
+	clk_disable_unprepare(sess->core->dos_parser_clk);
+
+	return ret;
+}
+
+static void vdec_wait_inactive(struct amvdec_session *sess)
+{
+	/* We consider 50ms with no IRQ to be inactive. */
+	while (time_is_after_jiffies64(sess->last_irq_jiffies +
+				       msecs_to_jiffies(50)))
+		msleep(25);
+}
+
+static void vdec_poweroff(struct amvdec_session *sess)
+{
+	struct amvdec_ops *vdec_ops = sess->fmt_out->vdec_ops;
+	struct amvdec_codec_ops *codec_ops = sess->fmt_out->codec_ops;
+
+	vdec_wait_inactive(sess);
+	if (codec_ops->drain)
+		codec_ops->drain(sess);
+
+	vdec_ops->stop(sess);
+	clk_disable_unprepare(sess->core->dos_clk);
+	clk_disable_unprepare(sess->core->dos_parser_clk);
+}
+
+static void
+vdec_queue_recycle(struct amvdec_session *sess, struct vb2_buffer *vb)
+{
+	struct amvdec_buffer *new_buf;
+
+	new_buf = kmalloc(sizeof(*new_buf), GFP_KERNEL);
+	new_buf->vb = vb;
+
+	mutex_lock(&sess->bufs_recycle_lock);
+	list_add_tail(&new_buf->list, &sess->bufs_recycle);
+	mutex_unlock(&sess->bufs_recycle_lock);
+}
+
+static void vdec_m2m_device_run(void *priv)
+{
+	struct amvdec_session *sess = priv;
+
+	schedule_work(&sess->esparser_queue_work);
+}
+
+static void vdec_m2m_job_abort(void *priv)
+{
+	struct amvdec_session *sess = priv;
+
+	v4l2_m2m_job_finish(sess->m2m_dev, sess->m2m_ctx);
+}
+
+static const struct v4l2_m2m_ops vdec_m2m_ops = {
+	.device_run = vdec_m2m_device_run,
+	.job_abort = vdec_m2m_job_abort,
+};
+
+static int vdec_queue_setup(struct vb2_queue *q,
+		unsigned int *num_buffers, unsigned int *num_planes,
+		unsigned int sizes[], struct device *alloc_devs[])
+{
+	struct amvdec_session *sess = vb2_get_drv_priv(q);
+	struct amvdec_core *core = sess->core;
+	const struct amvdec_format *fmt_out = sess->fmt_out;
+	u32 pixfmt_cap = sess->pixfmt_cap;
+
+	switch (q->type) {
+	case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
+		sizes[0] = amvdec_get_output_size(sess);
+		*num_planes = 1;
+		break;
+	case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
+		if (pixfmt_cap == V4L2_PIX_FMT_NV12M) {
+			sizes[0] = amvdec_get_output_size(sess);
+			sizes[1] = amvdec_get_output_size(sess) / 2;
+			*num_planes = 2;
+		} else if (pixfmt_cap == V4L2_PIX_FMT_YUV420M) {
+			sizes[0] = amvdec_get_output_size(sess);
+			sizes[1] = amvdec_get_output_size(sess) / 4;
+			sizes[2] = amvdec_get_output_size(sess) / 4;
+			*num_planes = 3;
+		}
+		*num_buffers = min(max(*num_buffers, fmt_out->min_buffers),
+				   fmt_out->max_buffers);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	mutex_lock(&core->lock);
+	if (core->cur_sess && core->cur_sess != sess) {
+		mutex_unlock(&core->lock);
+		return -EBUSY;
+	}
+
+	core->cur_sess = sess;
+	mutex_unlock(&core->lock);
+
+	return 0;
+}
+
+static void vdec_vb2_buf_queue(struct vb2_buffer *vb)
+{
+	struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
+	struct amvdec_session *sess = vb2_get_drv_priv(vb->vb2_queue);
+	struct v4l2_m2m_ctx *m2m_ctx = sess->m2m_ctx;
+
+	mutex_lock(&sess->lock);
+	v4l2_m2m_buf_queue(m2m_ctx, vbuf);
+
+	if (!sess->streamon_out || !sess->streamon_cap)
+		goto unlock;
+
+	if (vb->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE &&
+	    vdec_codec_needs_recycle(sess))
+		vdec_queue_recycle(sess, vb);
+
+	schedule_work(&sess->esparser_queue_work);
+unlock:
+	mutex_unlock(&sess->lock);
+}
+
+static int vdec_start_streaming(struct vb2_queue *q, unsigned int count)
+{
+	struct amvdec_session *sess = vb2_get_drv_priv(q);
+	struct vb2_v4l2_buffer *buf;
+	int ret;
+
+	mutex_lock(&sess->lock);
+
+	if (q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
+		sess->streamon_out = 1;
+	else
+		sess->streamon_cap = 1;
+
+	if (!sess->streamon_out || !sess->streamon_cap) {
+		mutex_unlock(&sess->lock);
+		return 0;
+	}
+
+	sess->vififo_size = SIZE_VIFIFO;
+	sess->vififo_vaddr =
+		dma_alloc_coherent(sess->core->dev, sess->vififo_size,
+				   &sess->vififo_paddr, GFP_KERNEL);
+	if (!sess->vififo_vaddr) {
+		dev_err(sess->core->dev, "Failed to request VIFIFO buffer\n");
+		ret = -ENOMEM;
+		goto bufs_done;
+	}
+
+	sess->should_stop = 0;
+	sess->keyframe_found = 0;
+	atomic_set(&sess->esparser_queued_bufs, 0);
+	ret = vdec_poweron(sess);
+	if (ret)
+		goto vififo_free;
+
+	sess->sequence_cap = 0;
+	if (vdec_codec_needs_recycle(sess))
+		sess->recycle_thread = kthread_run(vdec_recycle_thread, sess,
+						   "vdec_recycle");
+	mutex_unlock(&sess->lock);
+
+	return 0;
+
+vififo_free:
+	dma_free_coherent(sess->core->dev, sess->vififo_size,
+			  sess->vififo_vaddr, sess->vififo_paddr);
+bufs_done:
+	while ((buf = v4l2_m2m_src_buf_remove(sess->m2m_ctx)))
+		v4l2_m2m_buf_done(buf, VB2_BUF_STATE_QUEUED);
+	while ((buf = v4l2_m2m_dst_buf_remove(sess->m2m_ctx)))
+		v4l2_m2m_buf_done(buf, VB2_BUF_STATE_QUEUED);
+
+	if (q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
+		sess->streamon_out = 0;
+	else
+		sess->streamon_cap = 0;
+	mutex_unlock(&sess->lock);
+	return ret;
+}
+
+static void vdec_free_canvas(struct amvdec_session *sess)
+{
+	int i;
+
+	for (i = 0; i < sess->canvas_num; ++i)
+		meson_canvas_free(sess->core->canvas, sess->canvas_alloc[i]);
+
+	sess->canvas_num = 0;
+}
+
+static void vdec_reset_timestamps(struct amvdec_session *sess)
+{
+	struct amvdec_timestamp *tmp, *n;
+
+	list_for_each_entry_safe(tmp, n, &sess->timestamps, list) {
+		list_del(&tmp->list);
+		kfree(tmp);
+	}
+}
+
+static void vdec_reset_bufs_recycle(struct amvdec_session *sess)
+{
+	struct amvdec_buffer *tmp, *n;
+
+	list_for_each_entry_safe(tmp, n, &sess->bufs_recycle, list) {
+		list_del(&tmp->list);
+		kfree(tmp);
+	}
+}
+
+static void vdec_stop_streaming(struct vb2_queue *q)
+{
+	struct amvdec_session *sess = vb2_get_drv_priv(q);
+	struct vb2_v4l2_buffer *buf;
+
+	mutex_lock(&sess->lock);
+
+	if (sess->streamon_out && sess->streamon_cap) {
+		if (vdec_codec_needs_recycle(sess))
+			kthread_stop(sess->recycle_thread);
+
+		vdec_poweroff(sess);
+		vdec_free_canvas(sess);
+		dma_free_coherent(sess->core->dev, sess->vififo_size,
+				  sess->vififo_vaddr, sess->vififo_paddr);
+		vdec_reset_timestamps(sess);
+		vdec_reset_bufs_recycle(sess);
+		kfree(sess->priv);
+		sess->priv = NULL;
+	}
+
+	if (q->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
+		while ((buf = v4l2_m2m_src_buf_remove(sess->m2m_ctx)))
+			v4l2_m2m_buf_done(buf, VB2_BUF_STATE_ERROR);
+
+		sess->streamon_out = 0;
+	} else {
+		while ((buf = v4l2_m2m_dst_buf_remove(sess->m2m_ctx)))
+			v4l2_m2m_buf_done(buf, VB2_BUF_STATE_ERROR);
+
+		sess->streamon_cap = 0;
+	}
+
+	mutex_unlock(&sess->lock);
+}
+
+static const struct vb2_ops vdec_vb2_ops = {
+	.queue_setup = vdec_queue_setup,
+	.start_streaming = vdec_start_streaming,
+	.stop_streaming = vdec_stop_streaming,
+	.buf_queue = vdec_vb2_buf_queue,
+};
+
+static int
+vdec_querycap(struct file *file, void *fh, struct v4l2_capability *cap)
+{
+	strlcpy(cap->driver, "meson-vdec", sizeof(cap->driver));
+	strlcpy(cap->card, "Amlogic Video Decoder", sizeof(cap->card));
+	strlcpy(cap->bus_info, "platform:meson-vdec", sizeof(cap->bus_info));
+
+	return 0;
+}
+
+static const struct amvdec_format *
+find_format(const struct amvdec_format *fmts, u32 size, u32 pixfmt)
+{
+	unsigned int i;
+
+	for (i = 0; i < size; i++) {
+		if (fmts[i].pixfmt == pixfmt)
+			return &fmts[i];
+	}
+
+	return NULL;
+}
+
+static unsigned int
+vdec_supports_pixfmt_cap(const struct amvdec_format *fmt_out, u32 pixfmt_cap)
+{
+	int i;
+
+	for (i = 0; fmt_out->pixfmts_cap[i]; i++)
+		if (fmt_out->pixfmts_cap[i] == pixfmt_cap)
+			return 1;
+
+	return 0;
+}
+
+static const struct amvdec_format *
+vdec_try_fmt_common(struct amvdec_session *sess, u32 size,
+		    struct v4l2_format *f)
+{
+	struct v4l2_pix_format_mplane *pixmp = &f->fmt.pix_mp;
+	struct v4l2_plane_pix_format *pfmt = pixmp->plane_fmt;
+	const struct amvdec_format *fmts = sess->core->platform->formats;
+	const struct amvdec_format *fmt_out;
+
+	memset(pfmt[0].reserved, 0, sizeof(pfmt[0].reserved));
+	memset(pixmp->reserved, 0, sizeof(pixmp->reserved));
+
+	if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
+		fmt_out = find_format(fmts, size, pixmp->pixelformat);
+		if (!fmt_out) {
+			pixmp->pixelformat = V4L2_PIX_FMT_MPEG2;
+			fmt_out = find_format(fmts, size, pixmp->pixelformat);
+			pixmp->width = 1280;
+			pixmp->height = 720;
+		}
+
+		pfmt[0].sizeimage =
+			get_output_size(pixmp->width, pixmp->height);
+		pfmt[0].bytesperline = 0;
+		pixmp->num_planes = 1;
+	} else if (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
+		fmt_out = sess->fmt_out;
+		if (!vdec_supports_pixfmt_cap(fmt_out, pixmp->pixelformat))
+			pixmp->pixelformat = fmt_out->pixfmts_cap[0];
+
+		memset(pfmt[1].reserved, 0, sizeof(pfmt[1].reserved));
+		if (pixmp->pixelformat == V4L2_PIX_FMT_NV12M) {
+			pfmt[0].sizeimage =
+				get_output_size(pixmp->width, pixmp->height);
+			pfmt[0].bytesperline = ALIGN(pixmp->width, 64);
+
+			pfmt[1].sizeimage =
+			      get_output_size(pixmp->width, pixmp->height) / 2;
+			pfmt[1].bytesperline = ALIGN(pixmp->width, 64);
+			pixmp->num_planes = 2;
+		} else if (pixmp->pixelformat == V4L2_PIX_FMT_YUV420M) {
+			pfmt[0].sizeimage =
+				get_output_size(pixmp->width, pixmp->height);
+			pfmt[0].bytesperline = ALIGN(pixmp->width, 64);
+
+			pfmt[1].sizeimage =
+			      get_output_size(pixmp->width, pixmp->height) / 4;
+			pfmt[1].bytesperline = ALIGN(pixmp->width, 64) / 2;
+
+			pfmt[2].sizeimage =
+			      get_output_size(pixmp->width, pixmp->height) / 4;
+			pfmt[2].bytesperline = ALIGN(pixmp->width, 64) / 2;
+			pixmp->num_planes = 3;
+		}
+	} else {
+		return NULL;
+	}
+
+	pixmp->width  = clamp(pixmp->width,  (u32)256, fmt_out->max_width);
+	pixmp->height = clamp(pixmp->height, (u32)144, fmt_out->max_height);
+
+	if (pixmp->field == V4L2_FIELD_ANY)
+		pixmp->field = V4L2_FIELD_NONE;
+
+	pixmp->flags = 0;
+
+	return fmt_out;
+}
+
+static int vdec_try_fmt(struct file *file, void *fh, struct v4l2_format *f)
+{
+	struct amvdec_session *sess =
+		container_of(file->private_data, struct amvdec_session, fh);
+
+	vdec_try_fmt_common(sess, sess->core->platform->num_formats, f);
+
+	return 0;
+}
+
+static int vdec_g_fmt(struct file *file, void *fh, struct v4l2_format *f)
+{
+	struct amvdec_session *sess =
+		container_of(file->private_data, struct amvdec_session, fh);
+	struct v4l2_pix_format_mplane *pixmp = &f->fmt.pix_mp;
+
+	if (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
+		pixmp->pixelformat = sess->pixfmt_cap;
+	else if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
+		pixmp->pixelformat = sess->fmt_out->pixfmt;
+
+	if (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
+		pixmp->width = sess->width;
+		pixmp->height = sess->height;
+		pixmp->colorspace = sess->colorspace;
+		pixmp->ycbcr_enc = sess->ycbcr_enc;
+		pixmp->quantization = sess->quantization;
+		pixmp->xfer_func = sess->xfer_func;
+	} else if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
+		pixmp->width = sess->width;
+		pixmp->height = sess->height;
+	}
+
+	vdec_try_fmt_common(sess, sess->core->platform->num_formats, f);
+
+	return 0;
+}
+
+static int vdec_s_fmt(struct file *file, void *fh, struct v4l2_format *f)
+{
+	struct amvdec_session *sess =
+		container_of(file->private_data, struct amvdec_session, fh);
+	struct v4l2_pix_format_mplane *pixmp = &f->fmt.pix_mp;
+	u32 num_formats = sess->core->platform->num_formats;
+	const struct amvdec_format *fmt_out;
+	struct v4l2_pix_format_mplane orig_pixmp;
+	struct v4l2_format format;
+	u32 pixfmt_out = 0, pixfmt_cap = 0;
+
+	orig_pixmp = *pixmp;
+
+	fmt_out = vdec_try_fmt_common(sess, num_formats, f);
+
+	if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
+		pixfmt_out = pixmp->pixelformat;
+		pixfmt_cap = sess->pixfmt_cap;
+	} else if (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
+		pixfmt_cap = pixmp->pixelformat;
+		pixfmt_out = sess->fmt_out->pixfmt;
+	}
+
+	memset(&format, 0, sizeof(format));
+
+	format.type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
+	format.fmt.pix_mp.pixelformat = pixfmt_out;
+	format.fmt.pix_mp.width = orig_pixmp.width;
+	format.fmt.pix_mp.height = orig_pixmp.height;
+	vdec_try_fmt_common(sess, num_formats, &format);
+
+	if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
+		sess->width = format.fmt.pix_mp.width;
+		sess->height = format.fmt.pix_mp.height;
+		sess->colorspace = pixmp->colorspace;
+		sess->ycbcr_enc = pixmp->ycbcr_enc;
+		sess->quantization = pixmp->quantization;
+		sess->xfer_func = pixmp->xfer_func;
+	}
+
+	memset(&format, 0, sizeof(format));
+
+	format.type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
+	format.fmt.pix_mp.pixelformat = pixfmt_cap;
+	format.fmt.pix_mp.width = orig_pixmp.width;
+	format.fmt.pix_mp.height = orig_pixmp.height;
+	vdec_try_fmt_common(sess, num_formats, &format);
+
+	sess->width = format.fmt.pix_mp.width;
+	sess->height = format.fmt.pix_mp.height;
+
+	if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
+		sess->fmt_out = fmt_out;
+	else if (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE)
+		sess->pixfmt_cap = format.fmt.pix_mp.pixelformat;
+
+	return 0;
+}
+
+static int vdec_enum_fmt(struct file *file, void *fh, struct v4l2_fmtdesc *f)
+{
+	struct amvdec_session *sess =
+		container_of(file->private_data, struct amvdec_session, fh);
+	const struct vdec_platform *platform = sess->core->platform;
+	const struct amvdec_format *fmt_out;
+
+	memset(f->reserved, 0, sizeof(f->reserved));
+
+	if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
+		if (f->index >= platform->num_formats)
+			return -EINVAL;
+
+		fmt_out = &platform->formats[f->index];
+		f->pixelformat = fmt_out->pixfmt;
+	} else if (f->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE) {
+		fmt_out = sess->fmt_out;
+		if (f->index >= 4 || !fmt_out->pixfmts_cap[f->index])
+			return -EINVAL;
+
+		f->pixelformat = fmt_out->pixfmts_cap[f->index];
+	} else {
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int vdec_enum_framesizes(struct file *file, void *fh,
+				struct v4l2_frmsizeenum *fsize)
+{
+	struct amvdec_session *sess =
+		container_of(file->private_data, struct amvdec_session, fh);
+	const struct amvdec_format *formats = sess->core->platform->formats;
+	const struct amvdec_format *fmt;
+	u32 num_formats = sess->core->platform->num_formats;
+
+	fmt = find_format(formats, num_formats, fsize->pixel_format);
+	if (!fmt || fsize->index)
+		return -EINVAL;
+
+	fsize->type = V4L2_FRMSIZE_TYPE_STEPWISE;
+
+	fsize->stepwise.min_width = 256;
+	fsize->stepwise.max_width = fmt->max_width;
+	fsize->stepwise.step_width = 1;
+	fsize->stepwise.min_height = 144;
+	fsize->stepwise.max_height = fmt->max_height;
+	fsize->stepwise.step_height = 1;
+
+	return 0;
+}
+
+static int
+vdec_try_decoder_cmd(struct file *file, void *fh, struct v4l2_decoder_cmd *cmd)
+{
+	switch (cmd->cmd) {
+	case V4L2_DEC_CMD_STOP:
+		if (cmd->flags & V4L2_DEC_CMD_STOP_TO_BLACK)
+			return -EINVAL;
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static int
+vdec_decoder_cmd(struct file *file, void *fh, struct v4l2_decoder_cmd *cmd)
+{
+	struct amvdec_session *sess =
+		container_of(file->private_data, struct amvdec_session, fh);
+	struct amvdec_codec_ops *codec_ops = sess->fmt_out->codec_ops;
+	int ret;
+
+	ret = vdec_try_decoder_cmd(file, fh, cmd);
+	if (ret)
+		return ret;
+
+	if (!(sess->streamon_out & sess->streamon_cap))
+		goto unlock;
+
+	dev_dbg(sess->core->dev, "Received V4L2_DEC_CMD_STOP\n");
+	sess->should_stop = 1;
+
+	vdec_wait_inactive(sess);
+
+	mutex_lock(&sess->lock);
+	if (codec_ops->drain)
+		codec_ops->drain(sess);
+	else
+		esparser_queue_eos(sess->core);
+
+unlock:
+	mutex_unlock(&sess->lock);
+	return ret;
+}
+
+static int vdec_subscribe_event(struct v4l2_fh *fh,
+				const struct v4l2_event_subscription *sub)
+{
+	switch (sub->type) {
+	case V4L2_EVENT_EOS:
+		return v4l2_event_subscribe(fh, sub, 2, NULL);
+	default:
+		return -EINVAL;
+	}
+}
+
+static const struct v4l2_ioctl_ops vdec_ioctl_ops = {
+	.vidioc_querycap = vdec_querycap,
+	.vidioc_enum_fmt_vid_cap_mplane = vdec_enum_fmt,
+	.vidioc_enum_fmt_vid_out_mplane = vdec_enum_fmt,
+	.vidioc_s_fmt_vid_cap_mplane = vdec_s_fmt,
+	.vidioc_s_fmt_vid_out_mplane = vdec_s_fmt,
+	.vidioc_g_fmt_vid_cap_mplane = vdec_g_fmt,
+	.vidioc_g_fmt_vid_out_mplane = vdec_g_fmt,
+	.vidioc_try_fmt_vid_cap_mplane = vdec_try_fmt,
+	.vidioc_try_fmt_vid_out_mplane = vdec_try_fmt,
+	.vidioc_reqbufs = v4l2_m2m_ioctl_reqbufs,
+	.vidioc_querybuf = v4l2_m2m_ioctl_querybuf,
+	.vidioc_create_bufs = v4l2_m2m_ioctl_create_bufs,
+	.vidioc_prepare_buf = v4l2_m2m_ioctl_prepare_buf,
+	.vidioc_qbuf = v4l2_m2m_ioctl_qbuf,
+	.vidioc_expbuf = v4l2_m2m_ioctl_expbuf,
+	.vidioc_dqbuf = v4l2_m2m_ioctl_dqbuf,
+	.vidioc_streamon = v4l2_m2m_ioctl_streamon,
+	.vidioc_streamoff = v4l2_m2m_ioctl_streamoff,
+	.vidioc_enum_framesizes = vdec_enum_framesizes,
+	.vidioc_subscribe_event = vdec_subscribe_event,
+	.vidioc_unsubscribe_event = v4l2_event_unsubscribe,
+	.vidioc_try_decoder_cmd = vdec_try_decoder_cmd,
+	.vidioc_decoder_cmd = vdec_decoder_cmd,
+};
+
+static int m2m_queue_init(void *priv, struct vb2_queue *src_vq,
+			  struct vb2_queue *dst_vq)
+{
+	struct amvdec_session *sess = priv;
+	int ret;
+
+	src_vq->type = V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE;
+	src_vq->io_modes = VB2_MMAP | VB2_DMABUF;
+	src_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
+	src_vq->ops = &vdec_vb2_ops;
+	src_vq->mem_ops = &vb2_dma_contig_memops;
+	src_vq->drv_priv = sess;
+	src_vq->buf_struct_size = sizeof(struct dummy_buf);
+	src_vq->allow_zero_bytesused = 1;
+	src_vq->min_buffers_needed = 1;
+	src_vq->dev = sess->core->dev;
+	ret = vb2_queue_init(src_vq);
+	if (ret)
+		return ret;
+
+	dst_vq->type = V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE;
+	dst_vq->io_modes = VB2_MMAP | VB2_DMABUF;
+	dst_vq->timestamp_flags = V4L2_BUF_FLAG_TIMESTAMP_COPY;
+	dst_vq->ops = &vdec_vb2_ops;
+	dst_vq->mem_ops = &vb2_dma_contig_memops;
+	dst_vq->drv_priv = sess;
+	dst_vq->buf_struct_size = sizeof(struct dummy_buf);
+	dst_vq->allow_zero_bytesused = 1;
+	dst_vq->min_buffers_needed = 1;
+	dst_vq->dev = sess->core->dev;
+	ret = vb2_queue_init(dst_vq);
+	if (ret) {
+		vb2_queue_release(src_vq);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int vdec_open(struct file *file)
+{
+	struct amvdec_core *core = video_drvdata(file);
+	struct device *dev = core->dev;
+	const struct amvdec_format *formats = core->platform->formats;
+	struct amvdec_session *sess;
+	int ret;
+
+	sess = kzalloc(sizeof(*sess), GFP_KERNEL);
+	if (!sess) {
+		mutex_unlock(&core->lock);
+		return -ENOMEM;
+	}
+
+	sess->core = core;
+
+	sess->m2m_dev = v4l2_m2m_init(&vdec_m2m_ops);
+	if (IS_ERR(sess->m2m_dev)) {
+		dev_err(dev, "Fail to v4l2_m2m_init\n");
+		ret = PTR_ERR(sess->m2m_dev);
+		goto err_free_sess;
+	}
+
+	sess->m2m_ctx = v4l2_m2m_ctx_init(sess->m2m_dev, sess, m2m_queue_init);
+	if (IS_ERR(sess->m2m_ctx)) {
+		dev_err(dev, "Fail to v4l2_m2m_ctx_init\n");
+		ret = PTR_ERR(sess->m2m_ctx);
+		goto err_m2m_release;
+	}
+
+	sess->pixfmt_cap = formats[0].pixfmts_cap[0];
+	sess->fmt_out = &formats[0];
+	sess->width = 1280;
+	sess->height = 720;
+
+	INIT_LIST_HEAD(&sess->timestamps);
+	INIT_LIST_HEAD(&sess->bufs_recycle);
+	INIT_WORK(&sess->esparser_queue_work, esparser_queue_all_src);
+	mutex_init(&sess->lock);
+	mutex_init(&sess->bufs_recycle_lock);
+	spin_lock_init(&sess->ts_spinlock);
+
+	v4l2_fh_init(&sess->fh, core->vdev_dec);
+	v4l2_fh_add(&sess->fh);
+	sess->fh.m2m_ctx = sess->m2m_ctx;
+	file->private_data = &sess->fh;
+
+	return 0;
+
+err_m2m_release:
+	v4l2_m2m_release(sess->m2m_dev);
+err_free_sess:
+	kfree(sess);
+	return ret;
+}
+
+static int vdec_close(struct file *file)
+{
+	struct amvdec_session *sess =
+		container_of(file->private_data, struct amvdec_session, fh);
+	struct amvdec_core *core = sess->core;
+
+	v4l2_m2m_ctx_release(sess->m2m_ctx);
+	v4l2_m2m_release(sess->m2m_dev);
+	v4l2_fh_del(&sess->fh);
+	v4l2_fh_exit(&sess->fh);
+
+	mutex_destroy(&sess->lock);
+	mutex_destroy(&sess->bufs_recycle_lock);
+
+	kfree(sess);
+
+	if (core->cur_sess == sess)
+		core->cur_sess = NULL;
+
+	return 0;
+}
+
+static const struct v4l2_file_operations vdec_fops = {
+	.owner = THIS_MODULE,
+	.open = vdec_open,
+	.release = vdec_close,
+	.unlocked_ioctl = video_ioctl2,
+	.poll = v4l2_m2m_fop_poll,
+	.mmap = v4l2_m2m_fop_mmap,
+#ifdef CONFIG_COMPAT
+	.compat_ioctl32 = v4l2_compat_ioctl32,
+#endif
+};
+
+static irqreturn_t vdec_isr(int irq, void *data)
+{
+	struct amvdec_core *core = data;
+	struct amvdec_session *sess = core->cur_sess;
+
+	sess->last_irq_jiffies = get_jiffies_64();
+
+	return sess->fmt_out->codec_ops->isr(sess);
+}
+
+static irqreturn_t vdec_threaded_isr(int irq, void *data)
+{
+	struct amvdec_core *core = data;
+	struct amvdec_session *sess = core->cur_sess;
+
+	return sess->fmt_out->codec_ops->threaded_isr(sess);
+}
+
+static const struct of_device_id vdec_dt_match[] = {
+	{ .compatible = "amlogic,gxbb-vdec",
+	  .data = &vdec_platform_gxbb },
+	{ .compatible = "amlogic,gxm-vdec",
+	  .data = &vdec_platform_gxm },
+	{ .compatible = "amlogic,gxl-vdec",
+	  .data = &vdec_platform_gxl },
+	{}
+};
+MODULE_DEVICE_TABLE(of, vdec_dt_match);
+
+static int vdec_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct video_device *vdev;
+	struct amvdec_core *core;
+	struct resource *r;
+	const struct of_device_id *of_id;
+	int irq;
+	int ret;
+
+	core = devm_kzalloc(dev, sizeof(*core), GFP_KERNEL);
+	if (!core)
+		return -ENOMEM;
+
+	core->dev = dev;
+	platform_set_drvdata(pdev, core);
+
+	r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dos");
+	core->dos_base = devm_ioremap_resource(dev, r);
+	if (IS_ERR(core->dos_base)) {
+		dev_err(dev, "Couldn't remap DOS memory\n");
+		return PTR_ERR(core->dos_base);
+	}
+
+	r = platform_get_resource_byname(pdev, IORESOURCE_MEM, "esparser");
+	core->esparser_base = devm_ioremap_resource(dev, r);
+	if (IS_ERR(core->esparser_base)) {
+		dev_err(dev, "Couldn't remap ESPARSER memory\n");
+		return PTR_ERR(core->esparser_base);
+	}
+
+	core->regmap_ao = syscon_regmap_lookup_by_phandle(dev->of_node,
+							 "amlogic,ao-sysctrl");
+	if (IS_ERR(core->regmap_ao)) {
+		dev_err(dev, "Couldn't regmap AO sysctrl\n");
+		return PTR_ERR(core->regmap_ao);
+	}
+
+	core->canvas = meson_canvas_get(dev);
+	if (!core->canvas)
+		return PTR_ERR(core->canvas);
+
+	core->dos_parser_clk = devm_clk_get(dev, "dos_parser");
+	if (IS_ERR(core->dos_parser_clk))
+		return -EPROBE_DEFER;
+
+	core->dos_clk = devm_clk_get(dev, "dos");
+	if (IS_ERR(core->dos_clk))
+		return -EPROBE_DEFER;
+
+	core->vdec_1_clk = devm_clk_get(dev, "vdec_1");
+	if (IS_ERR(core->vdec_1_clk))
+		return -EPROBE_DEFER;
+
+	core->vdec_hevc_clk = devm_clk_get(dev, "vdec_hevc");
+	if (IS_ERR(core->vdec_hevc_clk))
+		return -EPROBE_DEFER;
+
+	irq = platform_get_irq(pdev, 0);
+	if (irq < 0)
+		return irq;
+
+	ret = devm_request_threaded_irq(core->dev, irq, vdec_isr,
+					vdec_threaded_isr, IRQF_ONESHOT,
+					"vdec", core);
+	if (ret)
+		return ret;
+
+	ret = esparser_init(pdev, core);
+	if (ret)
+		return ret;
+
+	ret = v4l2_device_register(dev, &core->v4l2_dev);
+	if (ret) {
+		dev_err(dev, "Couldn't register v4l2 device\n");
+		return -ENOMEM;
+	}
+
+	vdev = video_device_alloc();
+	if (!vdev) {
+		ret = -ENOMEM;
+		goto err_vdev_release;
+	}
+
+	strlcpy(vdev->name, "meson-video-decoder", sizeof(vdev->name));
+	vdev->release = video_device_release;
+	vdev->fops = &vdec_fops;
+	vdev->ioctl_ops = &vdec_ioctl_ops;
+	vdev->vfl_dir = VFL_DIR_M2M;
+	vdev->v4l2_dev = &core->v4l2_dev;
+	vdev->device_caps = V4L2_CAP_VIDEO_M2M_MPLANE | V4L2_CAP_STREAMING;
+
+	ret = video_register_device(vdev, VFL_TYPE_GRABBER, -1);
+	if (ret) {
+		dev_err(dev, "Failed registering video device\n");
+		goto err_vdev_release;
+	}
+
+	of_id = of_match_node(vdec_dt_match, dev->of_node);
+	core->platform = of_id->data;
+	core->vdev_dec = vdev;
+	core->dev_dec = dev;
+	mutex_init(&core->lock);
+
+	video_set_drvdata(vdev, core);
+
+	return 0;
+
+err_vdev_release:
+	video_device_release(vdev);
+	return ret;
+}
+
+static int vdec_remove(struct platform_device *pdev)
+{
+	struct amvdec_core *core = platform_get_drvdata(pdev);
+
+	video_unregister_device(core->vdev_dec);
+
+	return 0;
+}
+
+static struct platform_driver meson_vdec_driver = {
+	.probe = vdec_probe,
+	.remove = vdec_remove,
+	.driver = {
+		.name = "meson-vdec",
+		.of_match_table = vdec_dt_match,
+	},
+};
+module_platform_driver(meson_vdec_driver);
+
+MODULE_DESCRIPTION("Meson video decoder driver for GXBB/GXL/GXM");
+MODULE_AUTHOR("Maxime Jourdan <[e-mail]>");
+MODULE_LICENSE("GPL");
diff --git a/drivers/media/platform/meson/vdec/vdec.h b/drivers/media/platform/meson/vdec/vdec.h
new file mode 100644
index 000000000000..8250fb82dfab
--- /dev/null
+++ b/drivers/media/platform/meson/vdec/vdec.h
@@ -0,0 +1,234 @@ 
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2018 BayLibre, SAS
+ * Author: Maxime Jourdan <[e-mail]>
+ */
+
+#ifndef __MESON_VDEC_CORE_H_
+#define __MESON_VDEC_CORE_H_
+
+/* 32 buffers in 3-plane YUV420 */
+#define MAX_CANVAS (32 * 3)
+
+#include <linux/regmap.h>
+#include <linux/list.h>
+#include <media/videobuf2-v4l2.h>
+#include <media/v4l2-ctrls.h>
+#include <media/v4l2-device.h>
+#include <linux/soc/amlogic/meson-canvas.h>
+
+#include "vdec_platform.h"
+
+struct amvdec_buffer {
+	struct list_head list;
+	struct vb2_buffer *vb;
+};
+
+struct amvdec_timestamp {
+	struct list_head list;
+	u64 ts;
+};
+
+struct amvdec_session;
+
+/**
+ * struct amvdec_core - device parameters, singleton
+ *
+ * @dos_base: DOS memory base address
+ * @esparser_base: PARSER memory base address
+ * @regmap_ao: regmap for the AO bus
+ * @dev: core device
+ * @dev_dec: decoder device
+ * @platform: platform-specific data
+ * @canvas: canvas provider reference
+ * @dos_parser_clk: DOS_PARSER clock
+ * @dos_clk: DOS clock
+ * @vdec_1_clk: VDEC_1 clock
+ * @vdec_hevc_clk: VDEC_HEVC clock
+ * @esparser_reset: RESET for the PARSER
+ * @vdec_dec: video device for the decoder
+ * @v4l2_dev: v4l2 device
+ * @cur_sess: current decoding session
+ * @lock: lock for this structure
+ */
+struct amvdec_core {
+	void __iomem *dos_base;
+	void __iomem *esparser_base;
+	struct regmap *regmap_ao;
+
+	struct device *dev;
+	struct device *dev_dec;
+	const struct vdec_platform *platform;
+
+	struct meson_canvas *canvas;
+
+	struct clk *dos_parser_clk;
+	struct clk *dos_clk;
+	struct clk *vdec_1_clk;
+	struct clk *vdec_hevc_clk;
+
+	struct reset_control *esparser_reset;
+
+	struct video_device *vdev_dec;
+	struct v4l2_device v4l2_dev;
+
+	struct amvdec_session *cur_sess;
+	struct mutex lock;
+};
+
+/**
+ * struct amvdec_ops - vdec operations
+ *
+ * @start: mandatory call when the vdec needs to initialize
+ * @stop: mandatory call when the vdec needs to stop
+ * @conf_esparser: mandatory call to let the vdec configure the ESPARSER
+ * @vififo_level: mandatory call to get the current amount of data
+ *		  in the VIFIFO
+ */
+struct amvdec_ops {
+	int (*start)(struct amvdec_session *sess);
+	int (*stop)(struct amvdec_session *sess);
+	void (*conf_esparser)(struct amvdec_session *sess);
+	u32 (*vififo_level)(struct amvdec_session *sess);
+};
+
+/**
+ * struct amvdec_codec_ops - codec operations
+ *
+ * @start: mandatory call when the codec needs to initialize
+ * @stop: mandatory call when the codec needs to stop
+ * @load_extended_firmware: optional call to load additional firmware bits
+ * @num_pending_bufs: optional call to get the number of dst buffers on hold
+ * @can_recycle: optional call to know if the codec is ready to recycle
+ *		 a dst buffer
+ * @recycle: optional call to tell the codec to recycle a dst buffer. Must go
+ *	     in pair with can_recycle
+ * @drain: optional call if the codec has a custom way of draining
+ * @isr: mandatory call when the ISR triggers
+ * @threaded_isr: mandatory call for the threaded ISR
+ */
+struct amvdec_codec_ops {
+	int (*start)(struct amvdec_session *sess);
+	int (*stop)(struct amvdec_session *sess);
+	int (*load_extended_firmware)(struct amvdec_session *sess,
+				      const u8 *data, u32 len);
+	u32 (*num_pending_bufs)(struct amvdec_session *sess);
+	int (*can_recycle)(struct amvdec_core *core);
+	void (*recycle)(struct amvdec_core *core, u32 buf_idx);
+	void (*drain)(struct amvdec_session *sess);
+	irqreturn_t (*isr)(struct amvdec_session *sess);
+	irqreturn_t (*threaded_isr)(struct amvdec_session *sess);
+};
+
+/**
+ * struct amvdec_format - describes one of the OUTPUT (src) format supported
+ *
+ * @pixfmt: V4L2 pixel format
+ * @min_buffers: minimum amount of CAPTURE (dst) buffers
+ * @max_buffers: maximum amount of CAPTURE (dst) buffers
+ * @max_width: maximum picture width supported
+ * @max_height: maximum picture height supported
+ * @vdec_ops: the VDEC operations that support this format
+ * @codec_ops: the codec operations that support this format
+ * @firmware_path: Path to the firmware that supports this format
+ * @pixfmts_cap: list of CAPTURE pixel formats available with pixfmt
+ */
+struct amvdec_format {
+	u32 pixfmt;
+	u32 min_buffers;
+	u32 max_buffers;
+	u32 max_width;
+	u32 max_height;
+
+	struct amvdec_ops *vdec_ops;
+	struct amvdec_codec_ops *codec_ops;
+
+	char *firmware_path;
+	u32 pixfmts_cap[4];
+};
+
+/**
+ * struct amvdec_session - decoding session parameters
+ *
+ * @core: reference to the vdec core struct
+ * @fh: v4l2 file handle
+ * @m2m_dev: v4l2 m2m device
+ * @m2m_ctx: v4l2 m2m context
+ * @lock: session lock
+ * @fmt_out: vdec pixel format for the OUTPUT queue
+ * @pixfmt_cap: V4L2 pixel format for the CAPTURE queue
+ * @width: current picture width
+ * @height: current picture height
+ * @colorspace: current colorspace
+ * @ycbcr_enc: current ycbcr_enc
+ * @quantization: current quantization
+ * @xfer_func: current transfer function
+ * @esparser_queued_bufs: number of buffers currently queued into ESPARSER
+ * @esparser_queue_work: work struct for the ESPARSER to process src buffers
+ * @streamon_cap: stream on flag for capture queue
+ * @streamon_out: stream on flag for output queue
+ * @sequence_cap: capture sequence counter
+ * @should_stop: flag set is userspacec signaled EOS via command
+ *		 or empty buffer
+ * @keyframe_found: flag set once a keyframe has been parsed
+ * @canvas_alloc: array of all the canvas IDs allocated
+ * @canvas_num: number of canvas IDs allocated
+ * @vififo_vaddr: virtual address for the VIFIFO
+ * @vififo_paddr: physical address for the VIFIFO
+ * @vififo_size: size of the VIFIFO dma alloc
+ * @bufs_recycle: list of buffers that need to be recycled
+ * @bufs_recycle_lock: lock for the bufs_recycle list
+ * @recycle_thread: task struct for the recycling thread
+ * @timestamps: chronological list of src timestamps
+ * @ts_spinlock: spinlock for the timestamps list
+ * @last_irq_jiffies: tracks last time the vdec triggered an IRQ
+ * @priv: codec private data
+ */
+struct amvdec_session {
+	struct amvdec_core *core;
+
+	struct v4l2_fh fh;
+	struct v4l2_m2m_dev *m2m_dev;
+	struct v4l2_m2m_ctx *m2m_ctx;
+	struct mutex lock;
+
+	const struct amvdec_format *fmt_out;
+	u32 pixfmt_cap;
+
+	u32 width;
+	u32 height;
+	u32 colorspace;
+	u8 ycbcr_enc;
+	u8 quantization;
+	u8 xfer_func;
+
+	atomic_t esparser_queued_bufs;
+	struct work_struct esparser_queue_work;
+
+	unsigned int streamon_cap, streamon_out;
+	unsigned int sequence_cap;
+	unsigned int should_stop;
+	unsigned int keyframe_found;
+
+	u8 canvas_alloc[MAX_CANVAS];
+	u32 canvas_num;
+
+	void *vififo_vaddr;
+	dma_addr_t vififo_paddr;
+	u32 vififo_size;
+
+	struct list_head bufs_recycle;
+	struct mutex bufs_recycle_lock;
+	struct task_struct *recycle_thread;
+
+	struct list_head timestamps;
+	spinlock_t ts_spinlock;
+
+	u64 last_irq_jiffies;
+
+	void *priv;
+};
+
+u32 amvdec_get_output_size(struct amvdec_session *sess);
+
+#endif
diff --git a/drivers/media/platform/meson/vdec/vdec_1.c b/drivers/media/platform/meson/vdec/vdec_1.c
new file mode 100644
index 000000000000..29f6305a6276
--- /dev/null
+++ b/drivers/media/platform/meson/vdec/vdec_1.c
@@ -0,0 +1,228 @@ 
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 BayLibre, SAS
+ * Author: Maxime Jourdan <[e-mail]>
+ *
+ * VDEC_1 is a video decoding block that allows decoding of
+ * MPEG 1/2/4, H.263, H.264, MJPEG, VC1
+ */
+
+#include <linux/firmware.h>
+#include <linux/clk.h>
+
+#include "vdec_1.h"
+#include "vdec_helpers.h"
+#include "dos_regs.h"
+
+/* AO Registers */
+#define AO_RTI_GEN_PWR_SLEEP0	0xe8
+#define AO_RTI_GEN_PWR_ISO0	0xec
+	#define GEN_PWR_VDEC_1 (BIT(3) | BIT(2))
+
+#define MC_SIZE			(4096 * 4)
+
+static int
+vdec_1_load_firmware(struct amvdec_session *sess, const char *fwname)
+{
+	const struct firmware *fw;
+	struct amvdec_core *core = sess->core;
+	struct device *dev = core->dev_dec;
+	struct amvdec_codec_ops *codec_ops = sess->fmt_out->codec_ops;
+	static void *mc_addr;
+	static dma_addr_t mc_addr_map;
+	int ret;
+	u32 i = 1000;
+
+	ret = request_firmware(&fw, fwname, dev);
+	if (ret < 0)
+		return -EINVAL;
+
+	if (fw->size < MC_SIZE) {
+		dev_err(dev, "Firmware size %zu is too small. Expected %u.\n",
+			fw->size, MC_SIZE);
+		ret = -EINVAL;
+		goto release_firmware;
+	}
+
+	mc_addr = dma_alloc_coherent(core->dev, MC_SIZE,
+				     &mc_addr_map, GFP_KERNEL);
+	if (!mc_addr) {
+		dev_err(dev,
+			"Failed allocating memory for firmware loading\n");
+		ret = -ENOMEM;
+		goto release_firmware;
+	}
+
+	memcpy(mc_addr, fw->data, MC_SIZE);
+
+	amvdec_write_dos(core, MPSR, 0);
+	amvdec_write_dos(core, CPSR, 0);
+
+	amvdec_clear_dos_bits(core, MDEC_PIC_DC_CTRL, BIT(31));
+
+	amvdec_write_dos(core, IMEM_DMA_ADR, mc_addr_map);
+	amvdec_write_dos(core, IMEM_DMA_COUNT, MC_SIZE / 4);
+	amvdec_write_dos(core, IMEM_DMA_CTRL, (0x8000 | (7 << 16)));
+
+	while (--i && amvdec_read_dos(core, IMEM_DMA_CTRL) & 0x8000) { }
+
+	if (i == 0) {
+		dev_err(dev, "Firmware load fail (DMA hang?)\n");
+		ret = -EINVAL;
+		goto free_mc;
+	}
+
+	if (codec_ops->load_extended_firmware)
+		codec_ops->load_extended_firmware(sess, fw->data + MC_SIZE,
+						  fw->size - MC_SIZE);
+
+free_mc:
+	dma_free_coherent(core->dev, MC_SIZE, mc_addr, mc_addr_map);
+release_firmware:
+	release_firmware(fw);
+	return ret;
+}
+
+int vdec_1_stbuf_power_up(struct amvdec_session *sess)
+{
+	struct amvdec_core *core = sess->core;
+
+	amvdec_write_dos(core, VLD_MEM_VIFIFO_CONTROL, 0);
+	amvdec_write_dos(core, VLD_MEM_VIFIFO_WRAP_COUNT, 0);
+	amvdec_write_dos(core, POWER_CTL_VLD, BIT(4));
+
+	amvdec_write_dos(core, VLD_MEM_VIFIFO_START_PTR, sess->vififo_paddr);
+	amvdec_write_dos(core, VLD_MEM_VIFIFO_CURR_PTR, sess->vififo_paddr);
+	amvdec_write_dos(core, VLD_MEM_VIFIFO_END_PTR,
+			 sess->vififo_paddr + sess->vififo_size - 8);
+
+	amvdec_write_dos_bits(core, VLD_MEM_VIFIFO_CONTROL, 1);
+	amvdec_clear_dos_bits(core, VLD_MEM_VIFIFO_CONTROL, 1);
+
+	amvdec_write_dos(core, VLD_MEM_VIFIFO_BUF_CNTL, MEM_BUFCTRL_MANUAL);
+	amvdec_write_dos(core, VLD_MEM_VIFIFO_WP, sess->vififo_paddr);
+
+	amvdec_write_dos_bits(core, VLD_MEM_VIFIFO_BUF_CNTL, 1);
+	amvdec_clear_dos_bits(core, VLD_MEM_VIFIFO_BUF_CNTL, 1);
+
+	amvdec_write_dos_bits(core, VLD_MEM_VIFIFO_CONTROL,
+		(0x11 << MEM_FIFO_CNT_BIT) | MEM_FILL_ON_LEVEL |
+		MEM_CTRL_FILL_EN | MEM_CTRL_EMPTY_EN);
+
+	return 0;
+}
+
+static void vdec_1_conf_esparser(struct amvdec_session *sess)
+{
+	struct amvdec_core *core = sess->core;
+
+	/* VDEC_1 specific ESPARSER stuff */
+	amvdec_write_dos(core, DOS_GEN_CTRL0, 0);
+	amvdec_write_dos(core, VLD_MEM_VIFIFO_BUF_CNTL, 1);
+	amvdec_clear_dos_bits(core, VLD_MEM_VIFIFO_BUF_CNTL, 1);
+}
+
+static u32 vdec_1_vififo_level(struct amvdec_session *sess)
+{
+	struct amvdec_core *core = sess->core;
+
+	return amvdec_read_dos(core, VLD_MEM_VIFIFO_LEVEL);
+}
+
+static int vdec_1_stop(struct amvdec_session *sess)
+{
+	struct amvdec_core *core = sess->core;
+	struct amvdec_codec_ops *codec_ops = sess->fmt_out->codec_ops;
+
+	amvdec_write_dos(core, MPSR, 0);
+	amvdec_write_dos(core, CPSR, 0);
+	amvdec_write_dos(core, ASSIST_MBOX1_MASK, 0);
+
+	amvdec_write_dos(core, DOS_SW_RESET0, BIT(12) | BIT(11));
+	amvdec_write_dos(core, DOS_SW_RESET0, 0);
+	amvdec_read_dos(core, DOS_SW_RESET0);
+
+	/* enable vdec1 isolation */
+	regmap_write(core->regmap_ao, AO_RTI_GEN_PWR_ISO0, 0xc0);
+	/* power off vdec1 memories */
+	amvdec_write_dos(core, DOS_MEM_PD_VDEC, 0xffffffff);
+	/* power off vdec1 */
+	regmap_update_bits(core->regmap_ao, AO_RTI_GEN_PWR_SLEEP0,
+			   GEN_PWR_VDEC_1, GEN_PWR_VDEC_1);
+
+	clk_disable_unprepare(core->vdec_1_clk);
+
+	if (sess->priv)
+		codec_ops->stop(sess);
+
+	return 0;
+}
+
+static int vdec_1_start(struct amvdec_session *sess)
+{
+	int ret;
+	struct amvdec_core *core = sess->core;
+	struct amvdec_codec_ops *codec_ops = sess->fmt_out->codec_ops;
+
+	/* Configure the vdec clk to the maximum available */
+	clk_set_rate(core->vdec_1_clk, 666666666);
+	ret = clk_prepare_enable(core->vdec_1_clk);
+	if (ret)
+		return ret;
+
+	regmap_update_bits(core->regmap_ao, AO_RTI_GEN_PWR_SLEEP0,
+			   GEN_PWR_VDEC_1, 0);
+	udelay(10);
+
+	/* Reset VDEC1 */
+	amvdec_write_dos(core, DOS_SW_RESET0, 0xfffffffc);
+	amvdec_write_dos(core, DOS_SW_RESET0, 0x00000000);
+
+	amvdec_write_dos(core, DOS_GCLK_EN0, 0x3ff);
+
+	/* enable VDEC Memories */
+	amvdec_write_dos(core, DOS_MEM_PD_VDEC, 0);
+	/* Remove VDEC1 Isolation */
+	regmap_write(core->regmap_ao, AO_RTI_GEN_PWR_ISO0, 0);
+	/* Reset DOS top registers */
+	amvdec_write_dos(core, DOS_VDEC_MCRCC_STALL_CTRL, 0);
+
+	amvdec_write_dos(core, GCLK_EN, 0x3ff);
+	amvdec_clear_dos_bits(core, MDEC_PIC_DC_CTRL, BIT(31));
+
+	vdec_1_stbuf_power_up(sess);
+
+	ret = vdec_1_load_firmware(sess, sess->fmt_out->firmware_path);
+	if (ret)
+		goto stop;
+
+	ret = codec_ops->start(sess);
+	if (ret)
+		goto stop;
+
+	/* Enable IRQ */
+	amvdec_write_dos(core, ASSIST_MBOX1_CLR_REG, 1);
+	amvdec_write_dos(core, ASSIST_MBOX1_MASK, 1);
+
+	/* Enable 2-plane output */
+	if (sess->pixfmt_cap == V4L2_PIX_FMT_NV12M)
+		amvdec_write_dos_bits(core, MDEC_PIC_DC_CTRL, BIT(17));
+
+	/* Enable firmware processor */
+	amvdec_write_dos(core, MPSR, 1);
+	/* Let the firmware settle */
+	udelay(10);
+
+	return 0;
+
+stop:
+	vdec_1_stop(sess);
+	return ret;
+}
+
+struct amvdec_ops vdec_1_ops = {
+	.start = vdec_1_start,
+	.stop = vdec_1_stop,
+	.conf_esparser = vdec_1_conf_esparser,
+	.vififo_level = vdec_1_vififo_level,
+};
diff --git a/drivers/media/platform/meson/vdec/vdec_1.h b/drivers/media/platform/meson/vdec/vdec_1.h
new file mode 100644
index 000000000000..042d930c40d7
--- /dev/null
+++ b/drivers/media/platform/meson/vdec/vdec_1.h
@@ -0,0 +1,14 @@ 
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2018 BayLibre, SAS
+ * Author: Maxime Jourdan <[e-mail]>
+ */
+
+#ifndef __MESON_VDEC_VDEC_1_H_
+#define __MESON_VDEC_VDEC_1_H_
+
+#include "vdec.h"
+
+extern struct amvdec_ops vdec_1_ops;
+
+#endif
diff --git a/drivers/media/platform/meson/vdec/vdec_helpers.c b/drivers/media/platform/meson/vdec/vdec_helpers.c
new file mode 100644
index 000000000000..615107629765
--- /dev/null
+++ b/drivers/media/platform/meson/vdec/vdec_helpers.c
@@ -0,0 +1,354 @@ 
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 BayLibre, SAS
+ * Author: Maxime Jourdan <[e-mail]>
+ */
+
+#include <media/v4l2-mem2mem.h>
+#include <media/v4l2-event.h>
+#include <media/videobuf2-dma-contig.h>
+
+#include "vdec_helpers.h"
+
+#define NUM_CANVAS_NV12 2
+#define NUM_CANVAS_YUV420 3
+
+u32 amvdec_read_dos(struct amvdec_core *core, u32 reg)
+{
+	return readl_relaxed(core->dos_base + reg);
+}
+EXPORT_SYMBOL_GPL(amvdec_read_dos);
+
+void amvdec_write_dos(struct amvdec_core *core, u32 reg, u32 val)
+{
+	writel_relaxed(val, core->dos_base + reg);
+}
+EXPORT_SYMBOL_GPL(amvdec_write_dos);
+
+void amvdec_write_dos_bits(struct amvdec_core *core, u32 reg, u32 val)
+{
+	amvdec_write_dos(core, reg, amvdec_read_dos(core, reg) | val);
+}
+EXPORT_SYMBOL_GPL(amvdec_write_dos_bits);
+
+void amvdec_clear_dos_bits(struct amvdec_core *core, u32 reg, u32 val)
+{
+	amvdec_write_dos(core, reg, amvdec_read_dos(core, reg) & ~val);
+}
+EXPORT_SYMBOL_GPL(amvdec_clear_dos_bits);
+
+u32 amvdec_read_parser(struct amvdec_core *core, u32 reg)
+{
+	return readl_relaxed(core->esparser_base + reg);
+}
+EXPORT_SYMBOL_GPL(amvdec_read_parser);
+
+void amvdec_write_parser(struct amvdec_core *core, u32 reg, u32 val)
+{
+	writel_relaxed(val, core->esparser_base + reg);
+}
+EXPORT_SYMBOL_GPL(amvdec_write_parser);
+
+static int canvas_alloc(struct amvdec_session *sess, u8 *canvas_id)
+{
+	int ret;
+
+	if (sess->canvas_num >= MAX_CANVAS) {
+		dev_err(sess->core->dev, "Reached max number of canvas\n");
+		return -ENOMEM;
+	}
+
+	ret = meson_canvas_alloc(sess->core->canvas, canvas_id);
+	if (ret)
+		return ret;
+
+	sess->canvas_alloc[sess->canvas_num++] = *canvas_id;
+	return 0;
+}
+
+static int set_canvas_yuv420m(struct amvdec_session *sess,
+			      struct vb2_buffer *vb, u32 width,
+			      u32 height, u32 reg)
+{
+	struct amvdec_core *core = sess->core;
+	u8 canvas_id[NUM_CANVAS_YUV420]; /* Y U V */
+	dma_addr_t buf_paddr[NUM_CANVAS_YUV420]; /* Y U V */
+	int ret, i;
+
+	for (i = 0; i < NUM_CANVAS_YUV420; ++i) {
+		ret = canvas_alloc(sess, &canvas_id[i]);
+		if (ret)
+			return ret;
+
+		buf_paddr[i] =
+		    vb2_dma_contig_plane_dma_addr(vb, i);
+	}
+
+	/* Y plane */
+	meson_canvas_config(core->canvas, canvas_id[0], buf_paddr[0],
+			    width, height, MESON_CANVAS_WRAP_NONE,
+			    MESON_CANVAS_BLKMODE_LINEAR,
+			    MESON_CANVAS_ENDIAN_SWAP64);
+
+	/* U plane */
+	meson_canvas_config(core->canvas, canvas_id[1], buf_paddr[1],
+			    width / 2, height / 2, MESON_CANVAS_WRAP_NONE,
+			    MESON_CANVAS_BLKMODE_LINEAR,
+			    MESON_CANVAS_ENDIAN_SWAP64);
+
+	/* V plane */
+	meson_canvas_config(core->canvas, canvas_id[2], buf_paddr[2],
+			    width / 2, height / 2, MESON_CANVAS_WRAP_NONE,
+			    MESON_CANVAS_BLKMODE_LINEAR,
+			    MESON_CANVAS_ENDIAN_SWAP64);
+
+	amvdec_write_dos(core, reg,
+			 ((canvas_id[2]) << 16) |
+			 ((canvas_id[1]) << 8)  |
+			 (canvas_id[0]));
+
+	return 0;
+}
+
+static int set_canvas_nv12m(struct amvdec_session *sess,
+			    struct vb2_buffer *vb, u32 width,
+			    u32 height, u32 reg)
+{
+	struct amvdec_core *core = sess->core;
+	u8 canvas_id[NUM_CANVAS_NV12]; /* Y U/V */
+	dma_addr_t buf_paddr[NUM_CANVAS_NV12]; /* Y U/V */
+	int ret, i;
+
+	for (i = 0; i < NUM_CANVAS_NV12; ++i) {
+		ret = canvas_alloc(sess, &canvas_id[i]);
+		if (ret)
+			return ret;
+
+		buf_paddr[i] =
+		    vb2_dma_contig_plane_dma_addr(vb, i);
+	}
+
+	/* Y plane */
+	meson_canvas_config(core->canvas, canvas_id[0], buf_paddr[0],
+			    width, height, MESON_CANVAS_WRAP_NONE,
+			    MESON_CANVAS_BLKMODE_LINEAR,
+			    MESON_CANVAS_ENDIAN_SWAP64);
+
+	/* U/V plane */
+	meson_canvas_config(core->canvas, canvas_id[1], buf_paddr[1],
+			    width, height / 2, MESON_CANVAS_WRAP_NONE,
+			    MESON_CANVAS_BLKMODE_LINEAR,
+			    MESON_CANVAS_ENDIAN_SWAP64);
+
+	amvdec_write_dos(core, reg,
+			 ((canvas_id[1]) << 16) |
+			 ((canvas_id[1]) << 8)  |
+			 (canvas_id[0]));
+
+	return 0;
+}
+
+int amvdec_set_canvases(struct amvdec_session *sess,
+			u32 reg_base[], u32 reg_num[])
+{
+	struct v4l2_m2m_buffer *buf;
+	u32 pixfmt = sess->pixfmt_cap;
+	u32 width = ALIGN(sess->width, 64);
+	u32 height = ALIGN(sess->height, 64);
+	u32 reg_cur = reg_base[0];
+	u32 reg_num_cur = 0;
+	u32 reg_base_cur = 0;
+	int ret;
+
+	v4l2_m2m_for_each_dst_buf(sess->m2m_ctx, buf) {
+		if (!reg_base[reg_base_cur])
+			return -EINVAL;
+
+		reg_cur = reg_base[reg_base_cur] + reg_num_cur * 4;
+
+		switch (pixfmt) {
+		case V4L2_PIX_FMT_NV12M:
+			ret = set_canvas_nv12m(sess, &buf->vb.vb2_buf, width,
+					       height, reg_cur);
+			if (ret)
+				return ret;
+			break;
+		case V4L2_PIX_FMT_YUV420M:
+			ret = set_canvas_yuv420m(sess, &buf->vb.vb2_buf, width,
+						 height, reg_cur);
+			if (ret)
+				return ret;
+			break;
+		default:
+			dev_err(sess->core->dev, "Unsupported pixfmt %08X\n",
+				pixfmt);
+			return -EINVAL;
+		};
+
+		reg_num_cur++;
+		if (reg_num_cur >= reg_num[reg_base_cur]) {
+			reg_base_cur++;
+			reg_num_cur = 0;
+		}
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(amvdec_set_canvases);
+
+void amvdec_dst_buf_done(struct amvdec_session *sess,
+			 struct vb2_v4l2_buffer *vbuf, u32 field)
+{
+	struct device *dev = sess->core->dev_dec;
+	struct amvdec_timestamp *tmp;
+	struct list_head *timestamps = &sess->timestamps;
+	u32 output_size = amvdec_get_output_size(sess);
+	unsigned long flags;
+
+	spin_lock_irqsave(&sess->ts_spinlock, flags);
+	if (list_empty(timestamps)) {
+		dev_err(dev, "Buffer %u done but list is empty\n",
+			vbuf->vb2_buf.index);
+
+		v4l2_m2m_buf_done(vbuf, VB2_BUF_STATE_ERROR);
+		amvdec_abort(sess);
+		spin_unlock_irqrestore(&sess->ts_spinlock, flags);
+		goto end;
+	}
+
+	tmp = list_first_entry(timestamps, struct amvdec_timestamp, list);
+
+	switch (sess->pixfmt_cap) {
+	case V4L2_PIX_FMT_NV12M:
+		vbuf->vb2_buf.planes[0].bytesused = output_size;
+		vbuf->vb2_buf.planes[1].bytesused = output_size / 2;
+		break;
+	case V4L2_PIX_FMT_YUV420M:
+		vbuf->vb2_buf.planes[0].bytesused = output_size;
+		vbuf->vb2_buf.planes[1].bytesused = output_size / 4;
+		vbuf->vb2_buf.planes[2].bytesused = output_size / 4;
+		break;
+	}
+	vbuf->vb2_buf.timestamp = tmp->ts;
+	vbuf->sequence = sess->sequence_cap++;
+
+	list_del(&tmp->list);
+	kfree(tmp);
+	spin_unlock_irqrestore(&sess->ts_spinlock, flags);
+
+	atomic_dec(&sess->esparser_queued_bufs);
+
+	if (sess->should_stop && list_empty(timestamps)) {
+		const struct v4l2_event ev = { .type = V4L2_EVENT_EOS };
+
+		dev_dbg(dev, "Signaling EOS\n");
+		v4l2_event_queue_fh(&sess->fh, &ev);
+		vbuf->flags |= V4L2_BUF_FLAG_LAST;
+	} else if (sess->should_stop)
+		dev_dbg(dev, "should_stop, %u bufs remain\n",
+			atomic_read(&sess->esparser_queued_bufs));
+
+	vbuf->field = field;
+	v4l2_m2m_buf_done(vbuf, VB2_BUF_STATE_DONE);
+
+end:
+	/* Buffer done probably means the vififo got freed */
+	schedule_work(&sess->esparser_queue_work);
+}
+EXPORT_SYMBOL_GPL(amvdec_dst_buf_done);
+
+void
+amvdec_dst_buf_done_idx(struct amvdec_session *sess, u32 buf_idx, u32 field)
+{
+	struct vb2_v4l2_buffer *vbuf;
+	struct device *dev = sess->core->dev_dec;
+
+	vbuf = v4l2_m2m_dst_buf_remove_by_idx(sess->m2m_ctx, buf_idx);
+	if (!vbuf) {
+		dev_err(dev,
+			"Buffer %u done but it doesn't exist in m2m_ctx\n",
+			buf_idx);
+		amvdec_rm_first_ts(sess);
+		return;
+	}
+
+	amvdec_dst_buf_done(sess, vbuf, field);
+}
+EXPORT_SYMBOL_GPL(amvdec_dst_buf_done_idx);
+
+void amvdec_add_ts_reorder(struct amvdec_session *sess, u64 ts)
+{
+	struct amvdec_timestamp *new_ts, *tmp;
+	unsigned long flags;
+
+	new_ts = kmalloc(sizeof(*new_ts), GFP_KERNEL);
+	new_ts->ts = ts;
+
+	spin_lock_irqsave(&sess->ts_spinlock, flags);
+
+	if (list_empty(&sess->timestamps))
+		goto add_tail;
+
+	list_for_each_entry(tmp, &sess->timestamps, list) {
+		if (ts < tmp->ts) {
+			list_add_tail(&new_ts->list, &tmp->list);
+			goto unlock;
+		}
+	}
+
+add_tail:
+	list_add_tail(&new_ts->list, &sess->timestamps);
+unlock:
+	spin_unlock_irqrestore(&sess->ts_spinlock, flags);
+}
+EXPORT_SYMBOL_GPL(amvdec_add_ts_reorder);
+
+void amvdec_remove_ts(struct amvdec_session *sess, u64 ts)
+{
+	struct amvdec_timestamp *tmp;
+	unsigned long flags;
+
+	spin_lock_irqsave(&sess->ts_spinlock, flags);
+	list_for_each_entry(tmp, &sess->timestamps, list) {
+		if (tmp->ts == ts) {
+			list_del(&tmp->list);
+			kfree(tmp);
+			goto unlock;
+		}
+	}
+	dev_warn(sess->core->dev_dec,
+		 "Couldn't remove buffer with timestamp %llu from list\n", ts);
+
+unlock:
+	spin_unlock_irqrestore(&sess->ts_spinlock, flags);
+}
+EXPORT_SYMBOL_GPL(amvdec_remove_ts);
+
+void amvdec_rm_first_ts(struct amvdec_session *sess)
+{
+	unsigned long flags;
+	struct amvdec_buffer *tmp;
+	struct device *dev = sess->core->dev_dec;
+
+	spin_lock_irqsave(&sess->ts_spinlock, flags);
+	if (list_empty(&sess->timestamps)) {
+		dev_err(dev, "Can't rm first timestamp: list empty\n");
+		goto unlock;
+	}
+
+	tmp = list_first_entry(&sess->timestamps, struct amvdec_buffer, list);
+	list_del(&tmp->list);
+	kfree(tmp);
+	atomic_dec(&sess->esparser_queued_bufs);
+
+unlock:
+	spin_unlock_irqrestore(&sess->ts_spinlock, flags);
+}
+
+void amvdec_abort(struct amvdec_session *sess)
+{
+	dev_info(sess->core->dev, "Aborting decoding session!\n");
+	vb2_queue_error(&sess->m2m_ctx->cap_q_ctx.q);
+	vb2_queue_error(&sess->m2m_ctx->out_q_ctx.q);
+}
+EXPORT_SYMBOL_GPL(amvdec_abort);
diff --git a/drivers/media/platform/meson/vdec/vdec_helpers.h b/drivers/media/platform/meson/vdec/vdec_helpers.h
new file mode 100644
index 000000000000..352c6b4c4b84
--- /dev/null
+++ b/drivers/media/platform/meson/vdec/vdec_helpers.h
@@ -0,0 +1,45 @@ 
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2018 BayLibre, SAS
+ * Author: Maxime Jourdan <[e-mail]>
+ */
+
+#ifndef __MESON_VDEC_HELPERS_H_
+#define __MESON_VDEC_HELPERS_H_
+
+#include "vdec.h"
+
+/**
+ * amvdec_set_canvases() - Map VB2 buffers to canvases
+ *
+ * @sess: current session
+ * @reg_base: Registry bases of where to write the canvas indexes
+ * @reg_num: number of contiguous registers after each reg_base (including it)
+ */
+int amvdec_set_canvases(struct amvdec_session *sess,
+			u32 reg_base[], u32 reg_num[]);
+
+u32 amvdec_read_dos(struct amvdec_core *core, u32 reg);
+void amvdec_write_dos(struct amvdec_core *core, u32 reg, u32 val);
+void amvdec_write_dos_bits(struct amvdec_core *core, u32 reg, u32 val);
+void amvdec_clear_dos_bits(struct amvdec_core *core, u32 reg, u32 val);
+u32 amvdec_read_parser(struct amvdec_core *core, u32 reg);
+void amvdec_write_parser(struct amvdec_core *core, u32 reg, u32 val);
+
+void amvdec_dst_buf_done_idx(struct amvdec_session *sess, u32 buf_idx,
+			     u32 field);
+void amvdec_dst_buf_done(struct amvdec_session *sess,
+			 struct vb2_v4l2_buffer *vbuf, u32 field);
+
+/**
+ * amvdec_add_ts_reorder() - Add a timestamp to the list in chronological order
+ *
+ * @sess: current session
+ * @ts: timestamp to add
+ */
+void amvdec_add_ts_reorder(struct amvdec_session *sess, u64 ts);
+void amvdec_remove_ts(struct amvdec_session *sess, u64 ts);
+void amvdec_rm_first_ts(struct amvdec_session *sess);
+
+void amvdec_abort(struct amvdec_session *sess);
+#endif
diff --git a/drivers/media/platform/meson/vdec/vdec_platform.c b/drivers/media/platform/meson/vdec/vdec_platform.c
new file mode 100644
index 000000000000..46eeb7426f54
--- /dev/null
+++ b/drivers/media/platform/meson/vdec/vdec_platform.c
@@ -0,0 +1,101 @@ 
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 BayLibre, SAS
+ * Author: Maxime Jourdan <[e-mail]>
+ */
+
+#include "vdec_platform.h"
+#include "vdec.h"
+
+#include "vdec_1.h"
+#include "codec_mpeg12.h"
+
+static const struct amvdec_format vdec_formats_gxbb[] = {
+	{
+		.pixfmt = V4L2_PIX_FMT_MPEG1,
+		.min_buffers = 8,
+		.max_buffers = 8,
+		.max_width = 1920,
+		.max_height = 1080,
+		.vdec_ops = &vdec_1_ops,
+		.codec_ops = &codec_mpeg12_ops,
+		.firmware_path = "meson/gx/vmpeg12_mc",
+		.pixfmts_cap = { V4L2_PIX_FMT_NV12M, V4L2_PIX_FMT_YUV420M, 0 },
+	}, {
+		.pixfmt = V4L2_PIX_FMT_MPEG2,
+		.min_buffers = 8,
+		.max_buffers = 8,
+		.max_width = 1920,
+		.max_height = 1080,
+		.vdec_ops = &vdec_1_ops,
+		.codec_ops = &codec_mpeg12_ops,
+		.firmware_path = "meson/gx/vmpeg12_mc",
+		.pixfmts_cap = { V4L2_PIX_FMT_NV12M, V4L2_PIX_FMT_YUV420M, 0 },
+	},
+};
+
+static const struct amvdec_format vdec_formats_gxl[] = {
+	{
+		.pixfmt = V4L2_PIX_FMT_MPEG1,
+		.min_buffers = 8,
+		.max_buffers = 8,
+		.max_width = 1920,
+		.max_height = 1080,
+		.vdec_ops = &vdec_1_ops,
+		.codec_ops = &codec_mpeg12_ops,
+		.firmware_path = "meson/gx/vmpeg12_mc",
+		.pixfmts_cap = { V4L2_PIX_FMT_NV12M, V4L2_PIX_FMT_YUV420M, 0 },
+	}, {
+		.pixfmt = V4L2_PIX_FMT_MPEG2,
+		.min_buffers = 8,
+		.max_buffers = 8,
+		.max_width = 1920,
+		.max_height = 1080,
+		.vdec_ops = &vdec_1_ops,
+		.codec_ops = &codec_mpeg12_ops,
+		.firmware_path = "meson/gx/vmpeg12_mc",
+		.pixfmts_cap = { V4L2_PIX_FMT_NV12M, V4L2_PIX_FMT_YUV420M, 0 },
+	},
+};
+
+static const struct amvdec_format vdec_formats_gxm[] = {
+	{
+		.pixfmt = V4L2_PIX_FMT_MPEG1,
+		.min_buffers = 8,
+		.max_buffers = 8,
+		.max_width = 1920,
+		.max_height = 1080,
+		.vdec_ops = &vdec_1_ops,
+		.codec_ops = &codec_mpeg12_ops,
+		.firmware_path = "meson/gx/vmpeg12_mc",
+		.pixfmts_cap = { V4L2_PIX_FMT_NV12M, V4L2_PIX_FMT_YUV420M, 0 },
+	}, {
+		.pixfmt = V4L2_PIX_FMT_MPEG2,
+		.min_buffers = 8,
+		.max_buffers = 8,
+		.max_width = 1920,
+		.max_height = 1080,
+		.vdec_ops = &vdec_1_ops,
+		.codec_ops = &codec_mpeg12_ops,
+		.firmware_path = "meson/gx/vmpeg12_mc",
+		.pixfmts_cap = { V4L2_PIX_FMT_NV12M, V4L2_PIX_FMT_YUV420M, 0 },
+	},
+};
+
+const struct vdec_platform vdec_platform_gxbb = {
+	.formats = vdec_formats_gxbb,
+	.num_formats = ARRAY_SIZE(vdec_formats_gxbb),
+	.revision = VDEC_REVISION_GXBB,
+};
+
+const struct vdec_platform vdec_platform_gxl = {
+	.formats = vdec_formats_gxl,
+	.num_formats = ARRAY_SIZE(vdec_formats_gxl),
+	.revision = VDEC_REVISION_GXL,
+};
+
+const struct vdec_platform vdec_platform_gxm = {
+	.formats = vdec_formats_gxm,
+	.num_formats = ARRAY_SIZE(vdec_formats_gxm),
+	.revision = VDEC_REVISION_GXM,
+};
diff --git a/drivers/media/platform/meson/vdec/vdec_platform.h b/drivers/media/platform/meson/vdec/vdec_platform.h
new file mode 100644
index 000000000000..f6025326db1d
--- /dev/null
+++ b/drivers/media/platform/meson/vdec/vdec_platform.h
@@ -0,0 +1,30 @@ 
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright (C) 2018 BayLibre, SAS
+ * Author: Maxime Jourdan <[e-mail]>
+ */
+
+#ifndef __MESON_VDEC_PLATFORM_H_
+#define __MESON_VDEC_PLATFORM_H_
+
+#include "vdec.h"
+
+struct amvdec_format;
+
+enum vdec_revision {
+	VDEC_REVISION_GXBB,
+	VDEC_REVISION_GXL,
+	VDEC_REVISION_GXM,
+};
+
+struct vdec_platform {
+	const struct amvdec_format *formats;
+	const u32 num_formats;
+	enum vdec_revision revision;
+};
+
+extern const struct vdec_platform vdec_platform_gxbb;
+extern const struct vdec_platform vdec_platform_gxm;
+extern const struct vdec_platform vdec_platform_gxl;
+
+#endif