[12/13] drm: bridge/dw_hdmi-ahb-audio: add audio driver

Message ID	E1Yr1y8-0006lG-Mw@rmk-PC.arm.linux.org.uk (mailing list archive)
State	New, archived
Headers	show Return-Path: <linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org> In-Reply-To: <20150509102501.GO2067@n2100.arm.linux.org.uk> References: <20150509102501.GO2067@n2100.arm.linux.org.uk> From: Russell King <rmk+kernel@arm.linux.org.uk> To: alsa-devel@alsa-project.org, dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH 12/13] drm: bridge/dw_hdmi-ahb-audio: add audio driver MIME-Version: 1.0 Content-Disposition: inline Message-Id: <E1Yr1y8-0006lG-Mw@rmk-PC.arm.linux.org.uk> Date: Sat, 09 May 2015 11:26:52 +0100 Cc: Fabio Estevam <fabio.estevam@freescale.com>, David Airlie <airlied@linux.ie>, Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.de>, Mark Brown <broonie@kernel.org>, Philipp Zabel <p.zabel@pengutronix.de>, Yakir Yang <ykk@rock-chips.com> Precedence: list Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" <linux-arm-kernel-bounces@lists.infradead.org> Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org

diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig index acef3223772c..56ed35fe0734 100644 --- a/drivers/gpu/drm/bridge/Kconfig +++ b/drivers/gpu/drm/bridge/Kconfig @@ -3,6 +3,16 @@ config DRM_DW_HDMI depends on DRM select DRM_KMS_HELPER +config DRM_DW_HDMI_AHB_AUDIO + tristate "Synopsis Designware AHB Audio interface" + depends on DRM_DW_HDMI && SND + select SND_PCM + select SND_PCM_IEC958 + help + Support the AHB Audio interface which is part of the Synopsis + Designware HDMI block. This is used in conjunction with + the i.MX6 HDMI driver. + config DRM_PTN3460 tristate "PTN3460 DP/LVDS bridge" depends on DRM diff --git a/drivers/gpu/drm/bridge/Makefile b/drivers/gpu/drm/bridge/Makefile index 8dfebd984370..eb80dbbb8365 100644 --- a/drivers/gpu/drm/bridge/Makefile +++ b/drivers/gpu/drm/bridge/Makefile @@ -3,3 +3,4 @@ ccflags-y := -Iinclude/drm obj-$(CONFIG_DRM_PS8622) += ps8622.o obj-$(CONFIG_DRM_PTN3460) += ptn3460.o obj-$(CONFIG_DRM_DW_HDMI) += dw_hdmi.o +obj-$(CONFIG_DRM_DW_HDMI_AHB_AUDIO) += dw_hdmi-ahb-audio.o diff --git a/drivers/gpu/drm/bridge/dw_hdmi-ahb-audio.c b/drivers/gpu/drm/bridge/dw_hdmi-ahb-audio.c new file mode 100644 index 000000000000..e98c291268f4 --- /dev/null +++ b/drivers/gpu/drm/bridge/dw_hdmi-ahb-audio.c @@ -0,0 +1,560 @@ +/* + * DesignWare HDMI audio driver + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + * + * Written and tested against the Designware HDMI Tx found in iMX6. + */ +#include <linux/io.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/platform_device.h> +#include <drm/bridge/dw_hdmi.h> + +#include <sound/asoundef.h> +#include <sound/core.h> +#include <sound/initval.h> +#include <sound/pcm.h> +#include <sound/pcm_iec958.h> + +#include "dw_hdmi-ahb-audio.h" + +#define DRIVER_NAME "dw-hdmi-ahb-audio" + +/* Provide some bits rather than bit offsets */ +enum { + HDMI_AHB_DMA_CONF0_SW_FIFO_RST = BIT(7), + HDMI_AHB_DMA_CONF0_EN_HLOCK = BIT(3), + HDMI_AHB_DMA_START_START = BIT(0), + HDMI_AHB_DMA_STOP_STOP = BIT(0), + HDMI_IH_MUTE_AHBDMAAUD_STAT0_ERROR = BIT(5), + HDMI_IH_MUTE_AHBDMAAUD_STAT0_LOST = BIT(4), + HDMI_IH_MUTE_AHBDMAAUD_STAT0_RETRY = BIT(3), + HDMI_IH_MUTE_AHBDMAAUD_STAT0_DONE = BIT(2), + HDMI_IH_MUTE_AHBDMAAUD_STAT0_BUFFFULL = BIT(1), + HDMI_IH_MUTE_AHBDMAAUD_STAT0_BUFFEMPTY = BIT(0), + HDMI_IH_MUTE_AHBDMAAUD_STAT0_ALL = + HDMI_IH_MUTE_AHBDMAAUD_STAT0_ERROR | + HDMI_IH_MUTE_AHBDMAAUD_STAT0_LOST | + HDMI_IH_MUTE_AHBDMAAUD_STAT0_RETRY | + HDMI_IH_MUTE_AHBDMAAUD_STAT0_DONE | + HDMI_IH_MUTE_AHBDMAAUD_STAT0_BUFFFULL | + HDMI_IH_MUTE_AHBDMAAUD_STAT0_BUFFEMPTY, + HDMI_IH_AHBDMAAUD_STAT0_ERROR = BIT(5), + HDMI_IH_AHBDMAAUD_STAT0_LOST = BIT(4), + HDMI_IH_AHBDMAAUD_STAT0_RETRY = BIT(3), + HDMI_IH_AHBDMAAUD_STAT0_DONE = BIT(2), + HDMI_IH_AHBDMAAUD_STAT0_BUFFFULL = BIT(1), + HDMI_IH_AHBDMAAUD_STAT0_BUFFEMPTY = BIT(0), + HDMI_IH_AHBDMAAUD_STAT0_ALL = + HDMI_IH_AHBDMAAUD_STAT0_ERROR | + HDMI_IH_AHBDMAAUD_STAT0_LOST | + HDMI_IH_AHBDMAAUD_STAT0_RETRY | + HDMI_IH_AHBDMAAUD_STAT0_DONE | + HDMI_IH_AHBDMAAUD_STAT0_BUFFFULL | + HDMI_IH_AHBDMAAUD_STAT0_BUFFEMPTY, + HDMI_AHB_DMA_CONF0_INCR16 = 2 << 1, + HDMI_AHB_DMA_CONF0_INCR8 = 1 << 1, + HDMI_AHB_DMA_CONF0_INCR4 = 0, + HDMI_AHB_DMA_CONF0_BURST_MODE = BIT(0), + HDMI_AHB_DMA_MASK_DONE = BIT(7), + HDMI_REVISION_ID = 0x0001, + HDMI_IH_AHBDMAAUD_STAT0 = 0x0109, + HDMI_IH_MUTE_AHBDMAAUD_STAT0 = 0x0189, + HDMI_AHB_DMA_CONF0 = 0x3600, + HDMI_AHB_DMA_START = 0x3601, + HDMI_AHB_DMA_STOP = 0x3602, + HDMI_AHB_DMA_THRSLD = 0x3603, + HDMI_AHB_DMA_STRADDR0 = 0x3604, + HDMI_AHB_DMA_STPADDR0 = 0x3608, + HDMI_AHB_DMA_MASK = 0x3614, + HDMI_AHB_DMA_POL = 0x3615, + HDMI_AHB_DMA_CONF1 = 0x3616, + HDMI_AHB_DMA_BUFFPOL = 0x361a, +}; + +struct snd_dw_hdmi { + struct snd_card *card; + struct snd_pcm *pcm; + struct dw_hdmi_audio_data data; + struct snd_pcm_substream *substream; + void (*reformat)(struct snd_dw_hdmi *, size_t, size_t); + void *buf_src; + void *buf_dst; + dma_addr_t buf_addr; + unsigned buf_offset; + unsigned buf_period; + unsigned buf_size; + unsigned channels; + u8 revision; + u8 iec_offset; + u8 cs[192][8]; +}; + +static void dw_hdmi_writel(unsigned long val, void __iomem *ptr) +{ + writeb_relaxed(val, ptr); + writeb_relaxed(val >> 8, ptr + 1); + writeb_relaxed(val >> 16, ptr + 2); + writeb_relaxed(val >> 24, ptr + 3); +} + +/* + * Convert to hardware format: The userspace buffer contains IEC958 samples, + * with the PCUV bits in bits 31..28 and audio samples in bits 27..4. We + * need these to be in bits 27..24, with the IEC B bit in bit 28, and audio + * samples in 23..0. + * + * Default preamble in bits 3..0: 8 = block start, 4 = even 2 = odd + * + * Ideally, we could do with having the data properly formatted in userspace. + */ +static void dw_hdmi_reformat_iec958(struct snd_dw_hdmi *dw, + size_t offset, size_t bytes) +{ + u32 *src = dw->buf_src + offset; + u32 *dst = dw->buf_dst + offset; + u32 *end = dw->buf_src + offset + bytes; + + do { + u32 b, sample = *src++; + + b = (sample & 8) << (28 - 3); + + sample >>= 4; + + *dst++ = sample | b; + } while (src < end); +} + +static u32 parity(u32 sample) +{ + sample ^= sample >> 16; + sample ^= sample >> 8; + sample ^= sample >> 4; + sample ^= sample >> 2; + sample ^= sample >> 1; + return (sample & 1) << 27; +} + +static void dw_hdmi_reformat_s24(struct snd_dw_hdmi *dw, + size_t offset, size_t bytes) +{ + u32 *src = dw->buf_src + offset; + u32 *dst = dw->buf_dst + offset; + u32 *end = dw->buf_src + offset + bytes; + + do { + unsigned i; + u8 *cs; + + cs = dw->cs[dw->iec_offset++]; + if (dw->iec_offset >= 192) + dw->iec_offset = 0; + + i = dw->channels; + do { + u32 sample = *src++; + + sample &= ~0xff000000; + sample |= *cs++ << 24; + sample |= parity(sample & ~0xf8000000); + + *dst++ = sample; + } while (--i); + } while (src < end); +} + +static void dw_hdmi_create_cs(struct snd_dw_hdmi *dw, + struct snd_pcm_runtime *runtime) +{ + u8 cs[4]; + unsigned ch, i, j; + + snd_pcm_create_iec958_consumer(runtime, cs, sizeof(cs)); + + memset(dw->cs, 0, sizeof(dw->cs)); + + for (ch = 0; ch < 8; ch++) { + cs[2] &= ~IEC958_AES2_CON_CHANNEL; + cs[2] |= (ch + 1) << 4; + + for (i = 0; i < ARRAY_SIZE(cs); i++) { + unsigned c = cs[i]; + + for (j = 0; j < 8; j++, c >>= 1) + dw->cs[i * 8 + j][ch] = (c & 1) << 2; + } + } + dw->cs[0][0] |= BIT(4); +} + +static void dw_hdmi_start_dma(struct snd_dw_hdmi *dw) +{ + void __iomem *base = dw->data.base; + unsigned offset = dw->buf_offset; + unsigned period = dw->buf_period; + u32 start, stop; + + dw->reformat(dw, offset, period); + + /* Clear all irqs before enabling irqs and starting DMA */ + writeb_relaxed(HDMI_IH_AHBDMAAUD_STAT0_ALL, + base + HDMI_IH_AHBDMAAUD_STAT0); + + start = dw->buf_addr + offset; + stop = start + period - 1; + + /* Setup the hardware start/stop addresses */ + dw_hdmi_writel(start, base + HDMI_AHB_DMA_STRADDR0); + dw_hdmi_writel(stop, base + HDMI_AHB_DMA_STPADDR0); + + writeb_relaxed((u8)~HDMI_AHB_DMA_MASK_DONE, base + HDMI_AHB_DMA_MASK); + writeb(HDMI_AHB_DMA_START_START, base + HDMI_AHB_DMA_START); + + offset += period; + if (offset >= dw->buf_size) + offset = 0; + dw->buf_offset = offset; +} + +static void dw_hdmi_stop_dma(struct snd_dw_hdmi *dw) +{ + dw->substream = NULL; + + /* Disable interrupts before disabling DMA */ + writeb_relaxed(~0, dw->data.base + HDMI_AHB_DMA_MASK); + writeb_relaxed(HDMI_AHB_DMA_STOP_STOP, dw->data.base + HDMI_AHB_DMA_STOP); +} + +static irqreturn_t snd_dw_hdmi_irq(int irq, void *data) +{ + struct snd_dw_hdmi *dw = data; + struct snd_pcm_substream *substream; + unsigned stat; + + stat = readb_relaxed(dw->data.base + HDMI_IH_AHBDMAAUD_STAT0); + if (!stat) + return IRQ_NONE; + + writeb_relaxed(stat, dw->data.base + HDMI_IH_AHBDMAAUD_STAT0); + + substream = dw->substream; + if (stat & HDMI_IH_AHBDMAAUD_STAT0_DONE && substream) { + snd_pcm_period_elapsed(substream); + if (dw->substream) + dw_hdmi_start_dma(dw); + } + + return IRQ_HANDLED; +} + +static struct snd_pcm_hardware dw_hdmi_hw = { + .info = SNDRV_PCM_INFO_INTERLEAVED | + SNDRV_PCM_INFO_BLOCK_TRANSFER | + SNDRV_PCM_INFO_MMAP | + SNDRV_PCM_INFO_MMAP_VALID, + .formats = SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE | + SNDRV_PCM_FMTBIT_S24_LE, + .rates = SNDRV_PCM_RATE_32000 | + SNDRV_PCM_RATE_44100 | + SNDRV_PCM_RATE_48000 | + SNDRV_PCM_RATE_88200 | + SNDRV_PCM_RATE_96000 | + SNDRV_PCM_RATE_176400 | + SNDRV_PCM_RATE_192000, + .channels_min = 2, + .channels_max = 8, + .buffer_bytes_max = 64 * 1024, + .period_bytes_min = 256, + .period_bytes_max = 8192, /* ERR004323: must limit to 8k */ + .periods_min = 2, + .periods_max = 16, + .fifo_size = 0, +}; + +static int dw_hdmi_open(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct snd_dw_hdmi *dw = substream->private_data; + void __iomem *base = dw->data.base; + int ret; + + runtime->hw = dw_hdmi_hw; + + ret = snd_pcm_limit_hw_rates(runtime); + if (ret < 0) + return ret; + + ret = snd_pcm_hw_constraint_integer(runtime, SNDRV_PCM_HW_PARAM_PERIODS); + if (ret < 0) + return ret; + + /* Clear FIFO */ + writeb_relaxed(HDMI_AHB_DMA_CONF0_SW_FIFO_RST, + base + HDMI_AHB_DMA_CONF0); + + /* Configure interrupt polarities */ + writeb_relaxed(~0, base + HDMI_AHB_DMA_POL); + writeb_relaxed(~0, base + HDMI_AHB_DMA_BUFFPOL); + + /* Keep interrupts masked, and clear any pending */ + writeb_relaxed(~0, base + HDMI_AHB_DMA_MASK); + writeb_relaxed(~0, base + HDMI_IH_AHBDMAAUD_STAT0); + + ret = request_irq(dw->data.irq, snd_dw_hdmi_irq, IRQF_SHARED, + "dw-hdmi-audio", dw); + if (ret) + return ret; + + /* Un-mute done interrupt */ + writeb_relaxed(HDMI_IH_MUTE_AHBDMAAUD_STAT0_ALL & + ~HDMI_IH_MUTE_AHBDMAAUD_STAT0_DONE, + base + HDMI_IH_MUTE_AHBDMAAUD_STAT0); + + return 0; +} + +static int dw_hdmi_close(struct snd_pcm_substream *substream) +{ + struct snd_dw_hdmi *dw = substream->private_data; + + /* Mute all interrupts */ + writeb_relaxed(HDMI_IH_MUTE_AHBDMAAUD_STAT0_ALL, + dw->data.base + HDMI_IH_MUTE_AHBDMAAUD_STAT0); + + free_irq(dw->data.irq, dw); + + return 0; +} + +static int dw_hdmi_hw_free(struct snd_pcm_substream *substream) +{ + return snd_pcm_lib_free_vmalloc_buffer(substream); +} + +static int dw_hdmi_hw_params(struct snd_pcm_substream *substream, + struct snd_pcm_hw_params *params) +{ + return snd_pcm_lib_alloc_vmalloc_buffer(substream, + params_buffer_bytes(params)); +} + +static int dw_hdmi_prepare(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct snd_dw_hdmi *dw = substream->private_data; + u8 threshold, conf0, conf1; + + /* Setup as per 3.0.5 FSL 4.1.0 BSP */ + switch (dw->revision) { + case 0x0a: + conf0 = HDMI_AHB_DMA_CONF0_BURST_MODE | + HDMI_AHB_DMA_CONF0_INCR4; + if (runtime->channels == 2) + threshold = 126; + else + threshold = 124; + break; + case 0x1a: + conf0 = HDMI_AHB_DMA_CONF0_BURST_MODE | + HDMI_AHB_DMA_CONF0_INCR8; + threshold = 128; + break; + default: + /* NOTREACHED */ + return -EINVAL; + } + + dw_hdmi_set_sample_rate(dw->data.hdmi, runtime->rate); + + /* Minimum number of bytes in the fifo. */ + runtime->hw.fifo_size = threshold * 32; + + conf0 |= HDMI_AHB_DMA_CONF0_EN_HLOCK; + conf1 = (1 << runtime->channels) - 1; + + writeb_relaxed(threshold, dw->data.base + HDMI_AHB_DMA_THRSLD); + writeb_relaxed(conf0, dw->data.base + HDMI_AHB_DMA_CONF0); + writeb_relaxed(conf1, dw->data.base + HDMI_AHB_DMA_CONF1); + + switch (runtime->format) { + case SNDRV_PCM_FORMAT_IEC958_SUBFRAME_LE: + dw->reformat = dw_hdmi_reformat_iec958; + break; + case SNDRV_PCM_FORMAT_S24_LE: + dw_hdmi_create_cs(dw, runtime); + dw->reformat = dw_hdmi_reformat_s24; + break; + } + dw->iec_offset = 0; + dw->channels = runtime->channels; + dw->buf_src = runtime->dma_area; + dw->buf_dst = substream->dma_buffer.area; + dw->buf_addr = substream->dma_buffer.addr; + dw->buf_period = snd_pcm_lib_period_bytes(substream); + dw->buf_size = snd_pcm_lib_buffer_bytes(substream); + + return 0; +} + +static int dw_hdmi_trigger(struct snd_pcm_substream *substream, int cmd) +{ + struct snd_dw_hdmi *dw = substream->private_data; + int ret = 0; + + switch (cmd) { + case SNDRV_PCM_TRIGGER_START: + dw->buf_offset = 0; + dw->substream = substream; + dw_hdmi_start_dma(dw); + dw_hdmi_audio_enable(dw->data.hdmi); + substream->runtime->delay = substream->runtime->period_size; + break; + + case SNDRV_PCM_TRIGGER_STOP: + dw_hdmi_stop_dma(dw); + dw_hdmi_audio_disable(dw->data.hdmi); + break; + + default: + ret = -EINVAL; + break; + } + + return ret; +} + +static snd_pcm_uframes_t dw_hdmi_pointer(struct snd_pcm_substream *substream) +{ + struct snd_pcm_runtime *runtime = substream->runtime; + struct snd_dw_hdmi *dw = substream->private_data; + + return bytes_to_frames(runtime, dw->buf_offset); +} + +static struct snd_pcm_ops snd_dw_hdmi_ops = { + .open = dw_hdmi_open, + .close = dw_hdmi_close, + .ioctl = snd_pcm_lib_ioctl, + .hw_params = dw_hdmi_hw_params, + .hw_free = dw_hdmi_hw_free, + .prepare = dw_hdmi_prepare, + .trigger = dw_hdmi_trigger, + .pointer = dw_hdmi_pointer, + .page = snd_pcm_lib_get_vmalloc_page, +}; + +static int snd_dw_hdmi_probe(struct platform_device *pdev) +{ + const struct dw_hdmi_audio_data *data = pdev->dev.platform_data; + struct device *dev = pdev->dev.parent; + struct snd_dw_hdmi *dw; + struct snd_card *card; + struct snd_pcm *pcm; + unsigned revision; + int ret; + + writeb_relaxed(HDMI_IH_MUTE_AHBDMAAUD_STAT0_ALL, + data->base + HDMI_IH_MUTE_AHBDMAAUD_STAT0); + revision = readb_relaxed(data->base + HDMI_REVISION_ID); + if (revision != 0x0a && revision != 0x1a) { + dev_err(dev, "dw-hdmi-audio: unknown revision 0x%02x\n", + revision); + return -ENXIO; + } + + ret = snd_card_new(dev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1, + THIS_MODULE, sizeof(struct snd_dw_hdmi), &card); + if (ret < 0) + return ret; + + strlcpy(card->driver, DRIVER_NAME, sizeof(card->driver)); + strlcpy(card->shortname, "DW-HDMI", sizeof(card->shortname)); + snprintf(card->longname, sizeof(card->longname), + "%s rev 0x%02x, irq %d", card->shortname, revision, + data->irq); + + dw = card->private_data; + dw->card = card; + dw->data = *data; + dw->revision = revision; + + ret = snd_pcm_new(card, "DW HDMI", 0, 1, 0, &pcm); + if (ret < 0) + goto err; + + dw->pcm = pcm; + pcm->private_data = dw; + strlcpy(pcm->name, DRIVER_NAME, sizeof(pcm->name)); + snd_pcm_set_ops(pcm, SNDRV_PCM_STREAM_PLAYBACK, &snd_dw_hdmi_ops); + + snd_pcm_lib_preallocate_pages_for_all(pcm, SNDRV_DMA_TYPE_DEV, + dev, 64 * 1024, 64 * 1024); + + ret = snd_card_register(card); + if (ret < 0) + goto err; + + platform_set_drvdata(pdev, dw); + + return 0; + +err: + snd_card_free(card); + return ret; +} + +static int snd_dw_hdmi_remove(struct platform_device *pdev) +{ + struct snd_dw_hdmi *dw = platform_get_drvdata(pdev); + + snd_card_free(dw->card); + + return 0; +} + +#ifdef CONFIG_PM_SLEEP +static int snd_dw_hdmi_suspend(struct device *dev) +{ + struct snd_dw_hdmi *dw = dev_get_drvdata(dev); + + snd_power_change_state(dw->card, SNDRV_CTL_POWER_D3cold); + snd_pcm_suspend_all(dw->pcm); + + return 0; +} + +static int snd_dw_hdmi_resume(struct device *dev) +{ + struct snd_dw_hdmi *dw = dev_get_drvdata(dev); + + snd_power_change_state(dw->card, SNDRV_CTL_POWER_D0); + + return 0; +} + +static SIMPLE_DEV_PM_OPS(snd_dw_hdmi_pm, snd_dw_hdmi_suspend, + snd_dw_hdmi_resume); +#define PM_OPS &snd_dw_hdmi_pm +#else +#define PM_OPS NULL +#endif + +static struct platform_driver snd_dw_hdmi_driver = { + .probe = snd_dw_hdmi_probe, + .remove = snd_dw_hdmi_remove, + .driver = { + .name = DRIVER_NAME, + .owner = THIS_MODULE, + .pm = PM_OPS, + }, +}; + +module_platform_driver(snd_dw_hdmi_driver); + +MODULE_AUTHOR("Russell King <rmk+kernel@arm.linux.org.uk>"); +MODULE_LICENSE("GPL"); +MODULE_ALIAS(PLATFORM_MODULE_PREFIX DRIVER_NAME); diff --git a/drivers/gpu/drm/bridge/dw_hdmi-ahb-audio.h b/drivers/gpu/drm/bridge/dw_hdmi-ahb-audio.h new file mode 100644 index 000000000000..1e840118d90a --- /dev/null +++ b/drivers/gpu/drm/bridge/dw_hdmi-ahb-audio.h @@ -0,0 +1,13 @@ +#ifndef DW_HDMI_AUDIO_H +#define DW_HDMI_AUDIO_H + +struct dw_hdmi; + +struct dw_hdmi_audio_data { + phys_addr_t phys; + void __iomem *base; + int irq; + struct dw_hdmi *hdmi; +}; + +#endif diff --git a/drivers/gpu/drm/bridge/dw_hdmi.c b/drivers/gpu/drm/bridge/dw_hdmi.c index adda3a988f36..1cb427935ed2 100644 --- a/drivers/gpu/drm/bridge/dw_hdmi.c +++ b/drivers/gpu/drm/bridge/dw_hdmi.c @@ -28,6 +28,7 @@ #include <drm/bridge/dw_hdmi.h> #include "dw_hdmi.h" +#include "dw_hdmi-ahb-audio.h" #define HDMI_EDID_LEN 512 @@ -105,6 +106,7 @@ struct dw_hdmi { struct drm_encoder *encoder; struct drm_bridge *bridge; + struct platform_device *audio; enum dw_hdmi_devtype dev_type; struct device *dev; struct clk *isfr_clk; @@ -1592,7 +1594,9 @@ int dw_hdmi_bind(struct device *dev, struct device *master, { struct drm_device *drm = data; struct device_node *np = dev->of_node; + struct platform_device_info pdevinfo; struct device_node *ddc_node; + struct dw_hdmi_audio_data audio; struct dw_hdmi *hdmi; int ret; u32 val = 1; @@ -1712,6 +1716,23 @@ int dw_hdmi_bind(struct device *dev, struct device *master, /* Unmute interrupts */ hdmi_writeb(hdmi, ~HDMI_IH_PHY_STAT0_HPD, HDMI_IH_MUTE_PHY_STAT0); + memset(&pdevinfo, 0, sizeof(pdevinfo)); + pdevinfo.parent = dev; + pdevinfo.id = PLATFORM_DEVID_AUTO; + + if (hdmi_readb(hdmi, HDMI_CONFIG1_ID) & HDMI_CONFIG1_AHB) { + audio.phys = iores->start; + audio.base = hdmi->regs; + audio.irq = irq; + audio.hdmi = hdmi; + + pdevinfo.name = "dw-hdmi-ahb-audio"; + pdevinfo.data = &audio; + pdevinfo.size_data = sizeof(audio); + pdevinfo.dma_mask = DMA_BIT_MASK(32); + hdmi->audio = platform_device_register_full(&pdevinfo); + } + dev_set_drvdata(dev, hdmi); return 0; @@ -1729,6 +1750,9 @@ void dw_hdmi_unbind(struct device *dev, struct device *master, void *data) { struct dw_hdmi *hdmi = dev_get_drvdata(dev); + if (hdmi->audio && !IS_ERR(hdmi->audio)) + platform_device_unregister(hdmi->audio); + /* Disable all interrupts */ hdmi_writeb(hdmi, ~0, HDMI_IH_MUTE_PHY_STAT0); diff --git a/drivers/gpu/drm/bridge/dw_hdmi.h b/drivers/gpu/drm/bridge/dw_hdmi.h index 175dbc89a824..78e54e813212 100644 --- a/drivers/gpu/drm/bridge/dw_hdmi.h +++ b/drivers/gpu/drm/bridge/dw_hdmi.h @@ -545,6 +545,9 @@ #define HDMI_I2CM_FS_SCL_LCNT_0_ADDR 0x7E12 enum { +/* CONFIG1_ID field values */ + HDMI_CONFIG1_AHB = 0x01, + /* IH_FC_INT2 field values */ HDMI_IH_FC_INT2_OVERFLOW_MASK = 0x03, HDMI_IH_FC_INT2_LOW_PRIORITY_OVERFLOW = 0x02,

[12/13] drm: bridge/dw_hdmi-ahb-audio: add audio driver

Commit Message

Comments

Patch