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From: Sui Jingfeng <15330273260@189.cn>
To: Maxime Ripard <mripard@kernel.org>,
 Thomas Zimmermann <tzimmermann@suse.de>,
 Roland Scheidegger <sroland@vmware.com>, Zack Rusin <zackr@vmware.com>,
 Christian Gmeiner <christian.gmeiner@gmail.com>,
 David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
 Rob Herring <robh+dt@kernel.org>,
 Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
 Dan Carpenter <dan.carpenter@oracle.com>,
 Krzysztof Kozlowski <krzk@kernel.org>,
 Andrey Zhizhikin <andrey.zhizhikin@leica-geosystems.com>,
 Sam Ravnborg <sam@ravnborg.org>, "David S . Miller" <davem@davemloft.net>,
 Jiaxun Yang <jiaxun.yang@flygoat.com>,
 Lucas Stach <l.stach@pengutronix.de>,
 Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
 Ilia Mirkin <imirkin@alum.mit.edu>, Qing Zhang <zhangqing@loongson.cn>,
 Li Yi <liyi@loongson.cn>, suijingfeng <suijingfeng@loongson.cn>
Subject: [PATCH v8 1/3] drm/lsdc: add drm driver for loongson display
 controller
Date: Thu, 17 Feb 2022 02:17:10 +0800
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Cc: devicetree@vger.kernel.org, kernel test robot <lkp@intel.com>,
 Randy Dunlap <rdunlap@infradead.org>, linux-mips@vger.kernel.org,
 dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org,
 Maxime Ripard <maxime@cerno.tech>
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From: suijingfeng <suijingfeng@loongson.cn>

There is a display controller in loongson's LS2K1000 SoC and LS7A1000
bridge chip, it is a PCI device in those chips. It has two display
pipes but with only one hardware cursor. Each way has a DVO interface
which provide RGB888 signals, vertical & horizontal synchronisations,
data enable and the pixel clock. Each CRTC is able to scanout from
1920x1080 resolution at 60Hz. The maxmium resolution is 2048x2048
according to the hardware spec. Loongson display controllers are simple
which require scanout buffers to be physically contiguous.

For LS7A1000/LS7A2000 bridge chip, the DC is equipped with a dedicated
video ram which is typically 64MB or more. In this case, VRAM helper
based driver is intend to be used. While LS2K1000 is a SoC, only system
memory is available. Therefore CMA helper based driver is intend to be
used. It is possible to use VRAM helper based solution by carving out
part of system memory as VRAM though.

For LS7A1000, there are 4 dedicated GPIOs whose control register is
located at the DC register space, They are used to emulate two way i2c.
One for DVO0, another for DVO1. LS2K1000 and LS2K0500 SoC don't have such
GPIO hardwared, they grab i2c adapter from other module, either general
purpose GPIO emulated i2c or hardware i2c adapter.

    +------+            +-----------------------------------+
    | DDR4 |            |  +-------------------+            |
    +------+            |  | PCIe Root complex |   LS7A1000 |
       || MC0           |  +--++---------++----+            |
  +----------+  HT 3.0  |     ||         ||                 |
  | LS3A4000 |<-------->| +---++---+  +--++--+    +---------+   +------+
  |   CPU    |<-------->| | GC1000 |  | LSDC |<-->| DDR3 MC |<->| VRAM |
  +----------+          | +--------+  +-+--+-+    +---------+   +------+
       || MC1           +---------------|--|----------------+
    +------+                            |  |
    | DDR4 |          +-------+   DVO0  |  |  DVO1   +------+
    +------+   VGA <--|ADV7125|<--------+  +-------->|TFP410|--> DVI/HDMI
                      +-------+                      +------+

The above picture give a simple usage of LS7A1000, note that the encoder
is not necessary adv7125 or tfp410, other candicate encoders can be
ch7034b, sil9022 and ite66121 lt8618 etc.

v2: fixup warnings reported by kernel test robot

v3: fix more grammar mistakes in Kconfig reported by Randy Dunlap and give
    more details about lsdc.

v4:
   1) Add dts required and explain why device tree is required.
   2) Give more description about lsdc and vram helper base driver.
   3) Fix warnings reported by kernel test robot.
   4) Introduce stride_alignment member into struct lsdc_chip_desc, the
      stride alignment is 256 bytes for ls7a1000, ls2k1000 and ls2k0500.
      But ls7a2000 improve it to 32 bytes, for extend the support for the
      device on coming.

v5:
   1) using writel and readl replace writeq and readq, to fix kernel test
      robot report build error on other archtecture
   2) set default fb format to XRGB8888 at crtc reset time.
   3) fix typos.

v6:
   1) Explain why we are not switch to drm dridge subsystem on ls2k1000.
   2) Explain why tiny drm driver is not suitable for us.
   3) Give a short description of the trival dirty uppdate implement based
      on CMA helper.
   4) code clean up

v7:
   1) Remove select I2C_GPIO and I2C_LS2X in Kconfig, it is not ready now
   2) Licensing issues are fixed suggested by Krzysztof Kozlowski.
   3) lsdc_pixpll_print() is removed, part of it move to debugfs.
   4) Set prefer_shadow to true if vram based driver is in using.
   5) Replace double blank lines with single line in all files
   6) Verbose cmd line parameter is replaced with drm_dbg()
   7) All warnnings reported by ./scripts/checkpatch.pl --strict are fixed
   8) Get edid from dtb support is removed as suggested by Maxime Ripard
   9) Fix typos and various improvement

v8:
   1) Drop damage update implement and its command line.
   2) Drop DRM_LSDC_VRAM_DRIVER config option as suggested by Maxime.
   3) Deduce DC's identification from its compatible property.
   4) Drop the indroduction of board specific dts.
   5) Add documention about the display controller device node.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Reported-by: Krzysztof Kozlowski <krzk@kernel.org>
Reported-by: Maxime Ripard <maxime@cerno.tech>
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: suijingfeng <suijingfeng@loongson.cn>
Signed-off-by: Sui Jingfeng <15330273260@189.cn>
---
 drivers/gpu/drm/Kconfig               |   2 +
 drivers/gpu/drm/Makefile              |   1 +
 drivers/gpu/drm/lsdc/Kconfig          |  21 +
 drivers/gpu/drm/lsdc/Makefile         |  13 +
 drivers/gpu/drm/lsdc/lsdc_connector.c | 334 ++++++++++++
 drivers/gpu/drm/lsdc/lsdc_connector.h |  38 ++
 drivers/gpu/drm/lsdc/lsdc_crtc.c      | 341 +++++++++++++
 drivers/gpu/drm/lsdc/lsdc_drv.c       | 699 ++++++++++++++++++++++++++
 drivers/gpu/drm/lsdc/lsdc_drv.h       | 209 ++++++++
 drivers/gpu/drm/lsdc/lsdc_encoder.c   |  54 ++
 drivers/gpu/drm/lsdc/lsdc_i2c.c       | 198 ++++++++
 drivers/gpu/drm/lsdc/lsdc_i2c.h       |  40 ++
 drivers/gpu/drm/lsdc/lsdc_irq.c       |  60 +++
 drivers/gpu/drm/lsdc/lsdc_irq.h       |  20 +
 drivers/gpu/drm/lsdc/lsdc_plane.c     | 526 +++++++++++++++++++
 drivers/gpu/drm/lsdc/lsdc_pll.c       | 580 +++++++++++++++++++++
 drivers/gpu/drm/lsdc/lsdc_pll.h       |  90 ++++
 drivers/gpu/drm/lsdc/lsdc_regs.h      | 202 ++++++++
 18 files changed, 3428 insertions(+)
 create mode 100644 drivers/gpu/drm/lsdc/Kconfig
 create mode 100644 drivers/gpu/drm/lsdc/Makefile
 create mode 100644 drivers/gpu/drm/lsdc/lsdc_connector.c
 create mode 100644 drivers/gpu/drm/lsdc/lsdc_connector.h
 create mode 100644 drivers/gpu/drm/lsdc/lsdc_crtc.c
 create mode 100644 drivers/gpu/drm/lsdc/lsdc_drv.c
 create mode 100644 drivers/gpu/drm/lsdc/lsdc_drv.h
 create mode 100644 drivers/gpu/drm/lsdc/lsdc_encoder.c
 create mode 100644 drivers/gpu/drm/lsdc/lsdc_i2c.c
 create mode 100644 drivers/gpu/drm/lsdc/lsdc_i2c.h
 create mode 100644 drivers/gpu/drm/lsdc/lsdc_irq.c
 create mode 100644 drivers/gpu/drm/lsdc/lsdc_irq.h
 create mode 100644 drivers/gpu/drm/lsdc/lsdc_plane.c
 create mode 100644 drivers/gpu/drm/lsdc/lsdc_pll.c
 create mode 100644 drivers/gpu/drm/lsdc/lsdc_pll.h
 create mode 100644 drivers/gpu/drm/lsdc/lsdc_regs.h

diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig
index dfdd3ec5f793..18de1485e2ed 100644
--- a/drivers/gpu/drm/Kconfig
+++ b/drivers/gpu/drm/Kconfig
@@ -405,6 +405,8 @@ source "drivers/gpu/drm/gud/Kconfig"
 
 source "drivers/gpu/drm/sprd/Kconfig"
 
+source "drivers/gpu/drm/lsdc/Kconfig"
+
 config DRM_HYPERV
 	tristate "DRM Support for Hyper-V synthetic video device"
 	depends on DRM && PCI && MMU && HYPERV
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 8675c2af7ae1..2c5a76ced323 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -133,3 +133,4 @@ obj-y			+= xlnx/
 obj-y			+= gud/
 obj-$(CONFIG_DRM_HYPERV) += hyperv/
 obj-$(CONFIG_DRM_SPRD) += sprd/
+obj-$(CONFIG_DRM_LSDC) += lsdc/
diff --git a/drivers/gpu/drm/lsdc/Kconfig b/drivers/gpu/drm/lsdc/Kconfig
new file mode 100644
index 000000000000..de0567d5aa9d
--- /dev/null
+++ b/drivers/gpu/drm/lsdc/Kconfig
@@ -0,0 +1,21 @@
+# SPDX-License-Identifier: GPL-2.0
+
+config DRM_LSDC
+	tristate "DRM Support for loongson's display controller"
+	depends on DRM && PCI
+	depends on MACH_LOONGSON64 || LOONGARCH || MIPS || COMPILE_TEST
+	select OF
+	select CMA if HAVE_DMA_CONTIGUOUS
+	select DMA_CMA if HAVE_DMA_CONTIGUOUS
+	select DRM_KMS_HELPER
+	select DRM_KMS_FB_HELPER
+	select DRM_GEM_CMA_HELPER
+	select DRM_VRAM_HELPER
+	select VIDEOMODE_HELPERS
+	default m
+	help
+	  This is a KMS driver for the display controller in the LS7A1000
+	  bridge chip and LS2K1000/LS2K0500 SoC.
+	  If "M" is selected, the module will be called lsdc.
+
+	  If in doubt, say "Y".
diff --git a/drivers/gpu/drm/lsdc/Makefile b/drivers/gpu/drm/lsdc/Makefile
new file mode 100644
index 000000000000..7472c4ed53ff
--- /dev/null
+++ b/drivers/gpu/drm/lsdc/Makefile
@@ -0,0 +1,13 @@
+# SPDX-License-Identifier: GPL-2.0
+
+lsdc-y := \
+	lsdc_drv.o \
+	lsdc_crtc.o \
+	lsdc_irq.o \
+	lsdc_plane.o \
+	lsdc_pll.o \
+	lsdc_i2c.o \
+	lsdc_encoder.o \
+	lsdc_connector.o
+
+obj-$(CONFIG_DRM_LSDC) += lsdc.o
diff --git a/drivers/gpu/drm/lsdc/lsdc_connector.c b/drivers/gpu/drm/lsdc/lsdc_connector.c
new file mode 100644
index 000000000000..00af6e270ebf
--- /dev/null
+++ b/drivers/gpu/drm/lsdc/lsdc_connector.c
@@ -0,0 +1,334 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * KMS driver for Loongson display controller
+ *
+ * Copyright (C) 2020-2022, Sui Jingfeng <15330273260@189.cn>
+ *
+ */
+
+/*
+ * Authors:
+ *      Sui Jingfeng <suijingfeng@loongson.cn>
+ */
+
+#include <drm/drm_edid.h>
+#include <drm/drm_probe_helper.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_crtc_helper.h>
+#include <drm/drm_connector.h>
+
+#include <video/videomode.h>
+#include <video/of_display_timing.h>
+
+#include "lsdc_drv.h"
+#include "lsdc_i2c.h"
+#include "lsdc_connector.h"
+
+static int lsdc_get_modes_from_timings(struct drm_connector *connector)
+{
+	struct drm_device *ddev = connector->dev;
+	struct lsdc_connector *lconn = to_lsdc_connector(connector);
+	struct display_timings *disp_tim = lconn->disp_tim;
+	unsigned int num = 0;
+	unsigned int i;
+
+	for (i = 0; i < disp_tim->num_timings; i++) {
+		const struct display_timing *dt = disp_tim->timings[i];
+		struct drm_display_mode *mode;
+		struct videomode vm;
+
+		videomode_from_timing(dt, &vm);
+		mode = drm_mode_create(ddev);
+		if (!mode) {
+			drm_err(ddev, "failed to add mode %ux%u\n",
+				dt->hactive.typ, dt->vactive.typ);
+			continue;
+		}
+
+		drm_display_mode_from_videomode(&vm, mode);
+
+		mode->type |= DRM_MODE_TYPE_DRIVER;
+
+		if (i == disp_tim->native_mode)
+			mode->type |= DRM_MODE_TYPE_PREFERRED;
+
+		drm_mode_probed_add(connector, mode);
+		num++;
+	}
+
+	drm_dbg_kms(ddev, "%d modes added\n", num);
+
+	return num;
+}
+
+static int lsdc_get_modes_from_ddc(struct drm_connector *connector,
+				   struct i2c_adapter *ddc)
+{
+	unsigned int num = 0;
+	struct edid *edid;
+
+	edid = drm_get_edid(connector, ddc);
+	if (edid) {
+		drm_connector_update_edid_property(connector, edid);
+		num = drm_add_edid_modes(connector, edid);
+		kfree(edid);
+	}
+
+	return num;
+}
+
+static int lsdc_get_modes(struct drm_connector *connector)
+{
+	struct lsdc_connector *lconn = to_lsdc_connector(connector);
+	unsigned int num = 0;
+
+	if (lconn->has_disp_tim)
+		return lsdc_get_modes_from_timings(connector);
+
+	if (IS_ERR_OR_NULL(lconn->ddc) == false)
+		return lsdc_get_modes_from_ddc(connector, lconn->ddc);
+
+	if (connector->connector_type == DRM_MODE_CONNECTOR_VIRTUAL) {
+		num = drm_add_modes_noedid(connector,
+					   connector->dev->mode_config.max_width,
+					   connector->dev->mode_config.max_height);
+
+		drm_set_preferred_mode(connector, 1024, 768);
+
+		return num;
+	}
+
+	/*
+	 * In case we cannot retrieve the EDIDs (broken or missing i2c
+	 * bus), fallback on the XGA standards.
+	 */
+	num = drm_add_modes_noedid(connector, 1920, 1200);
+
+	/* And prefer a mode pretty much anyone can handle */
+	drm_set_preferred_mode(connector, 1024, 768);
+
+	return num;
+}
+
+static enum drm_connector_status
+lsdc_connector_detect(struct drm_connector *connector, bool force)
+{
+	struct lsdc_connector *lconn = to_lsdc_connector(connector);
+
+	if (lconn->has_disp_tim)
+		return connector_status_connected;
+
+	if (lconn->ddc && drm_probe_ddc(lconn->ddc))
+		return connector_status_connected;
+
+	if (connector->connector_type == DRM_MODE_CONNECTOR_VIRTUAL)
+		return connector_status_connected;
+
+	if (connector->connector_type == DRM_MODE_CONNECTOR_DVIA ||
+	    connector->connector_type == DRM_MODE_CONNECTOR_DVID ||
+	    connector->connector_type == DRM_MODE_CONNECTOR_DVII)
+		return connector_status_disconnected;
+
+	if (connector->connector_type == DRM_MODE_CONNECTOR_HDMIA ||
+	    connector->connector_type == DRM_MODE_CONNECTOR_HDMIB)
+		return connector_status_disconnected;
+
+	return connector_status_unknown;
+}
+
+static void lsdc_connector_destroy(struct drm_connector *connector)
+{
+	struct drm_device *ddev = connector->dev;
+	struct lsdc_connector *lconn = to_lsdc_connector(connector);
+
+	if (lconn) {
+		if (lconn->ddc)
+			lsdc_destroy_i2c(connector->dev, lconn->ddc);
+
+		drm_info(ddev, "destroying connector%u\n", lconn->index);
+
+		devm_kfree(ddev->dev, lconn);
+	}
+
+	drm_connector_cleanup(connector);
+}
+
+static const struct drm_connector_helper_funcs lsdc_connector_helpers = {
+	.get_modes = lsdc_get_modes,
+};
+
+static const struct drm_connector_funcs lsdc_connector_funcs = {
+	.dpms = drm_helper_connector_dpms,
+	.detect = lsdc_connector_detect,
+	.fill_modes = drm_helper_probe_single_connector_modes,
+	.destroy = lsdc_connector_destroy,
+	.reset = drm_atomic_helper_connector_reset,
+	.atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
+};
+
+/* lsdc_get_display_timings_from_dtb - Get display timings from the device tree
+ *
+ * @np: point to the device node contain the display timings
+ * @pptim: point to where the pointer of struct display_timings is store to
+ */
+static void lsdc_get_display_timings_from_dtb(struct device_node *np,
+					      struct display_timings **pptim)
+{
+	struct display_timings *timings;
+
+	if (!np)
+		return;
+
+	timings = of_get_display_timings(np);
+	if (timings)
+		*pptim = timings;
+}
+
+static int lsdc_get_connector_type(struct drm_device *ddev,
+				   struct device_node *output,
+				   unsigned int index)
+{
+	const char *name;
+	int ret;
+
+	ret = of_property_read_string(output, "connector", &name);
+	if (ret < 0)
+		return DRM_MODE_CONNECTOR_Unknown;
+
+	if (strncmp(name, "vga-connector", 13) == 0) {
+		ret = DRM_MODE_CONNECTOR_VGA;
+		drm_info(ddev, "connector%d is VGA\n", index);
+	} else if (strncmp(name, "dvi-connector", 13) == 0) {
+		bool analog, digital;
+
+		analog = of_property_read_bool(output, "analog");
+		digital = of_property_read_bool(output, "digital");
+
+		if (analog && !digital)
+			ret = DRM_MODE_CONNECTOR_DVIA;
+		else if (analog && digital)
+			ret = DRM_MODE_CONNECTOR_DVII;
+		else
+			ret = DRM_MODE_CONNECTOR_DVID;
+
+		drm_info(ddev, "connector%d is DVI\n", index);
+	} else if (strncmp(name, "virtual-connector", 17) == 0) {
+		ret = DRM_MODE_CONNECTOR_VIRTUAL;
+		drm_info(ddev, "connector%d is virtual\n", index);
+	} else if (strncmp(name, "dpi-connector", 13) == 0) {
+		ret = DRM_MODE_CONNECTOR_DPI;
+		drm_info(ddev, "connector%d is DPI\n", index);
+	} else if (strncmp(name, "hdmi-connector", 14) == 0) {
+		int res;
+		const char *hdmi_type;
+
+		ret = DRM_MODE_CONNECTOR_HDMIA;
+
+		res = of_property_read_string(output, "type", &hdmi_type);
+		if (res == 0 && !strcmp(hdmi_type, "b"))
+			ret = DRM_MODE_CONNECTOR_HDMIB;
+
+		drm_info(ddev, "connector%d is HDMI, type is %s\n", index, hdmi_type);
+	} else {
+		ret = DRM_MODE_CONNECTOR_Unknown;
+		drm_info(ddev, "The type of connector%d is unknown\n", index);
+	}
+
+	return ret;
+}
+
+struct lsdc_connector *lsdc_connector_init(struct lsdc_device *ldev, unsigned int index)
+{
+	struct drm_device *ddev = &ldev->drm;
+	struct device_node *np = ddev->dev->of_node;
+	struct device_node *output = NULL;
+	unsigned int connector_type = DRM_MODE_CONNECTOR_Unknown;
+	struct device_node *disp_tims_np;
+	struct lsdc_connector *lconn;
+	struct drm_connector *connector;
+	int ret;
+
+	lconn = devm_kzalloc(ddev->dev, sizeof(*lconn), GFP_KERNEL);
+	if (!lconn)
+		return ERR_PTR(-ENOMEM);
+
+	lconn->index = index;
+	lconn->has_disp_tim = false;
+	lconn->ddc = NULL;
+
+	output = of_parse_phandle(np, "output-ports", index);
+	if (!output) {
+		drm_warn(ddev, "no output-ports property, please update dtb\n");
+		/*
+		 * Providing a blindly support even though no output-ports
+		 * property is provided in the dtb.
+		 */
+		goto DT_SKIPED;
+	}
+
+	if (!of_device_is_available(output)) {
+		of_node_put(output);
+		drm_info(ddev, "connector%d is not available\n", index);
+		return NULL;
+	}
+
+	disp_tims_np = of_get_child_by_name(output, "display-timings");
+	if (disp_tims_np) {
+		lsdc_get_display_timings_from_dtb(output, &lconn->disp_tim);
+		lconn->has_disp_tim = true;
+		of_node_put(disp_tims_np);
+		drm_info(ddev, "Found display timings provided by connector%d\n", index);
+	}
+
+	connector_type = lsdc_get_connector_type(ddev, output, index);
+
+	if (output) {
+		of_node_put(output);
+		output = NULL;
+	}
+
+DT_SKIPED:
+
+	/* Only create the i2c channel if display timing is not provided */
+	if (!lconn->has_disp_tim) {
+		const struct lsdc_chip_desc * const desc = ldev->desc;
+
+		if (desc->have_builtin_i2c)
+			lconn->ddc = lsdc_create_i2c_chan(ddev, index);
+		else
+			lconn->ddc = lsdc_get_i2c_adapter(ddev, index);
+
+		if (IS_ERR(lconn->ddc)) {
+			lconn->ddc = NULL;
+
+			drm_err(ddev, "Get i2c adapter failed: %ld\n",
+				PTR_ERR(lconn->ddc));
+		} else if (lconn->ddc)
+			drm_info(ddev, "i2c%d for connector%d created\n",
+				 i2c_adapter_id(lconn->ddc), index);
+	}
+
+	connector = &lconn->base;
+	connector->polled = DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT;
+
+	ret = drm_connector_init_with_ddc(ddev,
+					  connector,
+					  &lsdc_connector_funcs,
+					  connector_type,
+					  lconn->ddc);
+	if (ret) {
+		drm_err(ddev, "init connector%d failed\n", index);
+		goto ERR_CONNECTOR_INIT;
+	}
+
+	drm_connector_helper_add(connector, &lsdc_connector_helpers);
+
+	return lconn;
+
+ERR_CONNECTOR_INIT:
+	if (!IS_ERR_OR_NULL(lconn->ddc))
+		lsdc_destroy_i2c(ddev, lconn->ddc);
+
+	return ERR_PTR(ret);
+}
diff --git a/drivers/gpu/drm/lsdc/lsdc_connector.h b/drivers/gpu/drm/lsdc/lsdc_connector.h
new file mode 100644
index 000000000000..0c9d38ef7219
--- /dev/null
+++ b/drivers/gpu/drm/lsdc/lsdc_connector.h
@@ -0,0 +1,38 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * KMS driver for Loongson display controller
+ *
+ * Copyright (C) 2020-2022, Sui Jingfeng <15330273260@189.cn>
+ *
+ */
+
+/*
+ * Authors:
+ *      Sui Jingfeng <suijingfeng@loongson.cn>
+ */
+
+#ifndef __LSDC_CONNECTOR_H__
+#define __LSDC_CONNECTOR_H__
+
+#include <drm/drm_device.h>
+#include <drm/drm_connector.h>
+
+struct lsdc_connector {
+	struct drm_connector base;
+
+	struct i2c_adapter *ddc;
+
+	/* Read display timmings from dtb support */
+	struct display_timings *disp_tim;
+	bool has_disp_tim;
+
+	int index;
+};
+
+#define to_lsdc_connector(x)        \
+		container_of(x, struct lsdc_connector, base)
+
+struct lsdc_connector *lsdc_connector_init(struct lsdc_device *ldev,
+					   unsigned int index);
+
+#endif
diff --git a/drivers/gpu/drm/lsdc/lsdc_crtc.c b/drivers/gpu/drm/lsdc/lsdc_crtc.c
new file mode 100644
index 000000000000..fdef0e0f4055
--- /dev/null
+++ b/drivers/gpu/drm/lsdc/lsdc_crtc.c
@@ -0,0 +1,341 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * KMS driver for Loongson display controller
+ *
+ * Copyright (C) 2020-2022, Sui Jingfeng <15330273260@189.cn>
+ *
+ */
+
+/*
+ * Authors:
+ *      Sui Jingfeng <suijingfeng@loongson.cn>
+ */
+#include <drm/drm_vblank.h>
+#include <drm/drm_atomic.h>
+#include <drm/drm_atomic_helper.h>
+
+#include "lsdc_drv.h"
+#include "lsdc_regs.h"
+#include "lsdc_pll.h"
+
+static int lsdc_crtc_enable_vblank(struct drm_crtc *crtc)
+{
+	struct lsdc_device *ldev = to_lsdc(crtc->dev);
+	unsigned int index = drm_crtc_index(crtc);
+	struct drm_crtc_state *state = crtc->state;
+	u32 val;
+
+	if (state->enable) {
+		val = lsdc_reg_read32(ldev, LSDC_INT_REG);
+
+		if (index == 0)
+			val |= INT_CRTC0_VS_EN;
+		else if (index == 1)
+			val |= INT_CRTC1_VS_EN;
+
+		lsdc_reg_write32(ldev, LSDC_INT_REG, val);
+	}
+
+	return 0;
+}
+
+static void lsdc_crtc_disable_vblank(struct drm_crtc *crtc)
+{
+	struct lsdc_device *ldev = to_lsdc(crtc->dev);
+	unsigned int index = drm_crtc_index(crtc);
+	u32 val;
+
+	val = lsdc_reg_read32(ldev, LSDC_INT_REG);
+
+	if (index == 0)
+		val &= ~INT_CRTC0_VS_EN;
+	else if (index == 1)
+		val &= ~INT_CRTC1_VS_EN;
+
+	lsdc_reg_write32(ldev, LSDC_INT_REG, val);
+}
+
+static void lsdc_crtc_reset(struct drm_crtc *crtc)
+{
+	struct drm_device *ddev = crtc->dev;
+	struct lsdc_device *ldev = to_lsdc(ddev);
+	unsigned int index = drm_crtc_index(crtc);
+	struct lsdc_crtc_state *priv_crtc_state;
+	u32 val;
+
+	/* The crtc get soft reset if bit 20 of CRTC*_CFG_REG
+	 * is write with falling edge.
+	 *
+	 * Doing this to switch from soft reset state to working state
+	 */
+	if (index == 0) {
+		val = CFG_RESET_BIT | CFG_OUTPUT_EN_BIT | LSDC_PF_XRGB8888;
+		lsdc_reg_write32(ldev, LSDC_CRTC0_CFG_REG, val);
+	} else if (index == 1) {
+		val = CFG_RESET_BIT | CFG_OUTPUT_EN_BIT | LSDC_PF_XRGB8888;
+		lsdc_reg_write32(ldev, LSDC_CRTC1_CFG_REG, val);
+	}
+
+	if (crtc->state) {
+		priv_crtc_state = to_lsdc_crtc_state(crtc->state);
+		__drm_atomic_helper_crtc_destroy_state(&priv_crtc_state->base);
+		kfree(priv_crtc_state);
+	}
+
+	priv_crtc_state = kzalloc(sizeof(*priv_crtc_state), GFP_KERNEL);
+	if (!priv_crtc_state)
+		return;
+
+	__drm_atomic_helper_crtc_reset(crtc, &priv_crtc_state->base);
+
+	drm_dbg(ddev, "crtc%u reset\n", index);
+}
+
+static void lsdc_crtc_atomic_destroy_state(struct drm_crtc *crtc, struct drm_crtc_state *state)
+{
+	struct lsdc_crtc_state *priv_crtc_state = to_lsdc_crtc_state(state);
+
+	__drm_atomic_helper_crtc_destroy_state(&priv_crtc_state->base);
+
+	kfree(priv_crtc_state);
+}
+
+static struct drm_crtc_state *lsdc_crtc_atomic_duplicate_state(struct drm_crtc *crtc)
+{
+	struct lsdc_crtc_state *new_priv_state;
+	struct lsdc_crtc_state *old_priv_state;
+	struct drm_device *ddev = crtc->dev;
+
+	if (drm_WARN_ON(ddev, !crtc->state))
+		return NULL;
+
+	new_priv_state = kmalloc(sizeof(*new_priv_state), GFP_KERNEL);
+	if (!new_priv_state)
+		return NULL;
+
+	__drm_atomic_helper_crtc_duplicate_state(crtc, &new_priv_state->base);
+
+	old_priv_state = to_lsdc_crtc_state(crtc->state);
+
+	memcpy(&new_priv_state->pparams, &old_priv_state->pparams, sizeof(new_priv_state->pparams));
+
+	return &new_priv_state->base;
+}
+
+static const struct drm_crtc_funcs lsdc_crtc_funcs = {
+	.reset = lsdc_crtc_reset,
+	.destroy = drm_crtc_cleanup,
+	.set_config = drm_atomic_helper_set_config,
+	.page_flip = drm_atomic_helper_page_flip,
+	.atomic_duplicate_state = lsdc_crtc_atomic_duplicate_state,
+	.atomic_destroy_state = lsdc_crtc_atomic_destroy_state,
+	.enable_vblank = lsdc_crtc_enable_vblank,
+	.disable_vblank = lsdc_crtc_disable_vblank,
+};
+
+static enum drm_mode_status
+lsdc_crtc_helper_mode_valid(struct drm_crtc *crtc,
+			    const struct drm_display_mode *mode)
+{
+	struct drm_device *ddev = crtc->dev;
+	struct lsdc_device *ldev = to_lsdc(ddev);
+	const struct lsdc_chip_desc *desc = ldev->desc;
+
+	if (mode->hdisplay > desc->max_width)
+		return MODE_BAD_HVALUE;
+	if (mode->vdisplay > desc->max_height)
+		return MODE_BAD_VVALUE;
+
+	if (mode->clock > desc->max_pixel_clk) {
+		drm_dbg_kms(ddev, "mode %dx%d, pixel clock=%d is too high\n",
+			    mode->hdisplay, mode->vdisplay, mode->clock);
+		return MODE_CLOCK_HIGH;
+	}
+
+	/* The CRTC hardware dma take 256 bytes once a time,
+	 * it is a limitation of the CRTC.
+	 * TODO: check RGB565 support
+	 */
+	if ((mode->hdisplay * 4) % desc->stride_alignment) {
+		drm_dbg_kms(ddev, "stride is not %u bytes aligned\n", desc->stride_alignment);
+		return MODE_BAD;
+	}
+
+	return MODE_OK;
+}
+
+static int lsdc_crtc_helper_atomic_check(struct drm_crtc *crtc,
+					 struct drm_atomic_state *state)
+{
+	struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
+
+	if (!crtc_state->enable)
+		return 0; /* no mode checks if CRTC is being disabled */
+
+	return 0;
+}
+
+static void lsdc_update_pixclk(struct drm_crtc *crtc, unsigned int pixclk)
+{
+	struct lsdc_display_pipe *dispipe = container_of(crtc, struct lsdc_display_pipe, crtc);
+	struct lsdc_pll *pixpll = &dispipe->pixpll;
+	const struct lsdc_pixpll_funcs *clkfun = pixpll->funcs;
+	struct lsdc_crtc_state *priv_state = to_lsdc_crtc_state(crtc->state);
+
+	clkfun->update(pixpll, &priv_state->pparams);
+}
+
+static void lsdc_crtc_helper_mode_set_nofb(struct drm_crtc *crtc)
+{
+	struct drm_device *ddev = crtc->dev;
+	struct lsdc_device *ldev = to_lsdc(ddev);
+	struct drm_display_mode *mode = &crtc->state->adjusted_mode;
+	unsigned int pixclock = mode->clock;
+	unsigned int index = drm_crtc_index(crtc);
+	u32 h_sync, v_sync, h_val, v_val;
+
+	/* 26:16 total pixels, 10:0 visiable pixels, in horizontal */
+	h_val = (mode->crtc_htotal << 16) | mode->crtc_hdisplay;
+	/* 26:16 total pixels, 10:0 visiable pixels, in vertical */
+	v_val = (mode->crtc_vtotal << 16) | mode->crtc_vdisplay;
+	/* 26:16 hsync end, 10:0 hsync start, bit 30 is hsync enable */
+	h_sync = (mode->crtc_hsync_end << 16) | mode->crtc_hsync_start | EN_HSYNC_BIT;
+	if (mode->flags & DRM_MODE_FLAG_NHSYNC)
+		h_sync |= INV_HSYNC_BIT;
+
+	/* 26:16 vsync end, 10:0 vsync start, bit 30 is vsync enable */
+	v_sync = (mode->crtc_vsync_end << 16) | mode->crtc_vsync_start | EN_VSYNC_BIT;
+	if (mode->flags & DRM_MODE_FLAG_NVSYNC)
+		v_sync |= INV_VSYNC_BIT;
+
+	if (index == 0) {
+		lsdc_reg_write32(ldev, LSDC_CRTC0_FB_ORIGIN_REG, 0);
+		lsdc_reg_write32(ldev, LSDC_CRTC0_HDISPLAY_REG, h_val);
+		lsdc_reg_write32(ldev, LSDC_CRTC0_VDISPLAY_REG, v_val);
+		lsdc_reg_write32(ldev, LSDC_CRTC0_HSYNC_REG, h_sync);
+		lsdc_reg_write32(ldev, LSDC_CRTC0_VSYNC_REG, v_sync);
+	} else if (index == 1) {
+		lsdc_reg_write32(ldev, LSDC_CRTC1_FB_ORIGIN_REG, 0);
+		lsdc_reg_write32(ldev, LSDC_CRTC1_HDISPLAY_REG, h_val);
+		lsdc_reg_write32(ldev, LSDC_CRTC1_VDISPLAY_REG, v_val);
+		lsdc_reg_write32(ldev, LSDC_CRTC1_HSYNC_REG, h_sync);
+		lsdc_reg_write32(ldev, LSDC_CRTC1_VSYNC_REG, v_sync);
+	}
+
+	drm_dbg(ddev, "%s modeset: %ux%u\n", crtc->name, mode->hdisplay, mode->vdisplay);
+
+	lsdc_update_pixclk(crtc, pixclock);
+}
+
+static void lsdc_enable_display(struct lsdc_device *ldev, unsigned int index)
+{
+	u32 val;
+
+	if (index == 0) {
+		val = lsdc_reg_read32(ldev, LSDC_CRTC0_CFG_REG);
+		val |= CFG_OUTPUT_EN_BIT;
+		lsdc_reg_write32(ldev, LSDC_CRTC0_CFG_REG, val);
+	} else if (index == 1) {
+		val = lsdc_reg_read32(ldev, LSDC_CRTC1_CFG_REG);
+		val |= CFG_OUTPUT_EN_BIT;
+		lsdc_reg_write32(ldev, LSDC_CRTC1_CFG_REG, val);
+	}
+}
+
+static void lsdc_disable_display(struct lsdc_device *ldev, unsigned int index)
+{
+	u32 val;
+
+	if (index == 0) {
+		val = lsdc_reg_read32(ldev, LSDC_CRTC0_CFG_REG);
+		val &= ~CFG_OUTPUT_EN_BIT;
+		lsdc_reg_write32(ldev, LSDC_CRTC0_CFG_REG, val);
+	} else if (index == 1) {
+		val = lsdc_reg_read32(ldev, LSDC_CRTC1_CFG_REG);
+		val &= ~CFG_OUTPUT_EN_BIT;
+		lsdc_reg_write32(ldev, LSDC_CRTC1_CFG_REG, val);
+	}
+}
+
+static void lsdc_crtc_helper_atomic_enable(struct drm_crtc *crtc,
+					   struct drm_atomic_state *state)
+{
+	struct drm_device *ddev = crtc->dev;
+	struct lsdc_device *ldev = to_lsdc(ddev);
+
+	drm_crtc_vblank_on(crtc);
+
+	lsdc_enable_display(ldev, drm_crtc_index(crtc));
+
+	drm_dbg(ddev, "%s: enabled\n", crtc->name);
+}
+
+static void lsdc_crtc_helper_atomic_disable(struct drm_crtc *crtc,
+					    struct drm_atomic_state *state)
+{
+	struct drm_device *ddev = crtc->dev;
+	struct lsdc_device *ldev = to_lsdc(ddev);
+
+	drm_crtc_vblank_off(crtc);
+
+	lsdc_disable_display(ldev, drm_crtc_index(crtc));
+
+	drm_dbg(ddev, "%s: disabled\n", crtc->name);
+}
+
+static void lsdc_crtc_atomic_flush(struct drm_crtc *crtc,
+				   struct drm_atomic_state *state)
+{
+	struct drm_pending_vblank_event *event = crtc->state->event;
+
+	if (event) {
+		crtc->state->event = NULL;
+
+		spin_lock_irq(&crtc->dev->event_lock);
+		if (drm_crtc_vblank_get(crtc) == 0)
+			drm_crtc_arm_vblank_event(crtc, event);
+		else
+			drm_crtc_send_vblank_event(crtc, event);
+		spin_unlock_irq(&crtc->dev->event_lock);
+	}
+}
+
+static const struct drm_crtc_helper_funcs lsdc_crtc_helper_funcs = {
+	.mode_valid = lsdc_crtc_helper_mode_valid,
+	.mode_set_nofb = lsdc_crtc_helper_mode_set_nofb,
+	.atomic_enable = lsdc_crtc_helper_atomic_enable,
+	.atomic_disable = lsdc_crtc_helper_atomic_disable,
+	.atomic_check = lsdc_crtc_helper_atomic_check,
+	.atomic_flush = lsdc_crtc_atomic_flush,
+};
+
+/**
+ * lsdc_crtc_init
+ *
+ * @ddev: point to the drm_device structure
+ * @index: hardware crtc index
+ *
+ * Init CRTC
+ */
+int lsdc_crtc_init(struct drm_device *ddev,
+		   struct drm_crtc *crtc,
+		   unsigned int index,
+		   struct drm_plane *primary,
+		   struct drm_plane *cursor)
+{
+	int ret;
+
+	drm_crtc_helper_add(crtc, &lsdc_crtc_helper_funcs);
+
+	ret = drm_mode_crtc_set_gamma_size(crtc, 256);
+	if (ret)
+		drm_warn(ddev, "set the gamma table size failed\n");
+
+	return drm_crtc_init_with_planes(ddev,
+					 crtc,
+					 primary,
+					 cursor,
+					 &lsdc_crtc_funcs,
+					 "crtc%d",
+					 index);
+}
diff --git a/drivers/gpu/drm/lsdc/lsdc_drv.c b/drivers/gpu/drm/lsdc/lsdc_drv.c
new file mode 100644
index 000000000000..d5824e032fab
--- /dev/null
+++ b/drivers/gpu/drm/lsdc/lsdc_drv.c
@@ -0,0 +1,699 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * KMS driver for Loongson display controller
+ *
+ * Copyright (C) 2020-2022, Sui Jingfeng <15330273260@189.cn>
+ *
+ */
+
+/*
+ * Authors:
+ *      Sui Jingfeng <suijingfeng@loongson.cn>
+ */
+
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/of_reserved_mem.h>
+
+#include <drm/drm_aperture.h>
+#include <drm/drm_of.h>
+#include <drm/drm_vblank.h>
+#include <drm/drm_debugfs.h>
+#include <drm/drm_fb_helper.h>
+#include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_fb_cma_helper.h>
+#include <drm/drm_gem_vram_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_probe_helper.h>
+
+#include "lsdc_drv.h"
+#include "lsdc_irq.h"
+#include "lsdc_regs.h"
+#include "lsdc_connector.h"
+#include "lsdc_pll.h"
+
+#define DRIVER_AUTHOR		"Sui Jingfeng <suijingfeng@loongson.cn>"
+#define DRIVER_NAME		"lsdc"
+#define DRIVER_DESC		"drm driver for loongson's display controller"
+#define DRIVER_DATE		"20200701"
+#define DRIVER_MAJOR		1
+#define DRIVER_MINOR		0
+#define DRIVER_PATCHLEVEL	0
+
+static int lsdc_use_vram_helper = -1;
+MODULE_PARM_DESC(use_vram_helper, "Using vram helper based driver(0 = disabled)");
+module_param_named(use_vram_helper, lsdc_use_vram_helper, int, 0644);
+
+static const struct lsdc_chip_desc dc_in_ls2k1000 = {
+	.chip = LSDC_CHIP_2K1000,
+	.num_of_crtc = LSDC_NUM_CRTC,
+	/* ls2k1000 user manual say the max pixel clock can be about 200MHz */
+	.max_pixel_clk = 200000,
+	.max_width = 2560,
+	.max_height = 2048,
+	.num_of_hw_cursor = 1,
+	.hw_cursor_w = 32,
+	.hw_cursor_h = 32,
+	.stride_alignment = 256,
+	.have_builtin_i2c = false,
+	.has_vram = false,
+};
+
+static const struct lsdc_chip_desc dc_in_ls2k0500 = {
+	.chip = LSDC_CHIP_2K0500,
+	.num_of_crtc = LSDC_NUM_CRTC,
+	.max_pixel_clk = 200000,
+	.max_width = 2048,
+	.max_height = 2048,
+	.num_of_hw_cursor = 1,
+	.hw_cursor_w = 32,
+	.hw_cursor_h = 32,
+	.stride_alignment = 256,
+	.have_builtin_i2c = false,
+	.has_vram = false,
+};
+
+static const struct lsdc_chip_desc dc_in_ls7a1000 = {
+	.chip = LSDC_CHIP_7A1000,
+	.num_of_crtc = LSDC_NUM_CRTC,
+	.max_pixel_clk = 200000,
+	.max_width = 2048,
+	.max_height = 2048,
+	.num_of_hw_cursor = 1,
+	.hw_cursor_w = 32,
+	.hw_cursor_h = 32,
+	.stride_alignment = 256,
+	.have_builtin_i2c = true,
+	.has_vram = true,
+};
+
+static const struct lsdc_chip_desc dc_in_ls7a2000 = {
+	.chip = LSDC_CHIP_7A2000,
+	.num_of_crtc = LSDC_NUM_CRTC,
+	.max_pixel_clk = 200000,
+	.max_width = 2048,
+	.max_height = 2048,
+	.num_of_hw_cursor = 2,
+	.hw_cursor_w = 64,
+	.hw_cursor_h = 64,
+	.stride_alignment = 256,
+	.have_builtin_i2c = true,
+	.has_vram = true,
+};
+
+static enum drm_mode_status
+lsdc_device_mode_valid(struct drm_device *ddev, const struct drm_display_mode *mode)
+{
+	struct lsdc_device *ldev = to_lsdc(ddev);
+
+	if (ldev->use_vram_helper)
+		return drm_vram_helper_mode_valid(ddev, mode);
+
+	return MODE_OK;
+}
+
+static const struct drm_mode_config_funcs lsdc_mode_config_funcs = {
+	.fb_create = drm_gem_fb_create,
+	.output_poll_changed = drm_fb_helper_output_poll_changed,
+	.atomic_check = drm_atomic_helper_check,
+	.atomic_commit = drm_atomic_helper_commit,
+	.mode_valid = lsdc_device_mode_valid,
+};
+
+#ifdef CONFIG_DEBUG_FS
+static int lsdc_show_clock(struct seq_file *m, void *arg)
+{
+	struct drm_info_node *node = (struct drm_info_node *)m->private;
+	struct drm_device *ddev = node->minor->dev;
+	struct drm_crtc *crtc;
+
+	drm_for_each_crtc(crtc, ddev) {
+		struct lsdc_display_pipe *pipe;
+		struct lsdc_pll *pixpll;
+		const struct lsdc_pixpll_funcs *funcs;
+		struct lsdc_pll_core_values params;
+		unsigned int out_khz;
+		struct drm_display_mode *adj;
+
+		pipe = container_of(crtc, struct lsdc_display_pipe, crtc);
+		if (!pipe->available)
+			continue;
+
+		adj = &crtc->state->adjusted_mode;
+
+		pixpll = &pipe->pixpll;
+		funcs = pixpll->funcs;
+		out_khz = funcs->get_clock_rate(pixpll, &params);
+
+		seq_printf(m, "Display pipe %u: %dx%d\n",
+			   pipe->index, adj->hdisplay, adj->vdisplay);
+
+		seq_printf(m, "Frequency actually output: %u kHz\n", out_khz);
+		seq_printf(m, "Pixel clock required: %d kHz\n", adj->clock);
+		seq_printf(m, "diff: %d kHz\n", adj->clock);
+
+		seq_printf(m, "div_ref=%u, loopc=%u, div_out=%u\n",
+			   params.div_ref, params.loopc, params.div_out);
+
+		seq_printf(m, "hsync_start=%d, hsync_end=%d, htotal=%d\n",
+			   adj->hsync_start, adj->hsync_end, adj->htotal);
+		seq_printf(m, "vsync_start=%d, vsync_end=%d, vtotal=%d\n\n",
+			   adj->vsync_start, adj->vsync_end, adj->vtotal);
+	}
+
+	return 0;
+}
+
+static int lsdc_show_mm(struct seq_file *m, void *arg)
+{
+	struct drm_info_node *node = (struct drm_info_node *)m->private;
+	struct drm_device *ddev = node->minor->dev;
+	struct drm_printer p = drm_seq_file_printer(m);
+
+	drm_mm_print(&ddev->vma_offset_manager->vm_addr_space_mm, &p);
+
+	return 0;
+}
+
+static struct drm_info_list lsdc_debugfs_list[] = {
+	{ "clocks", lsdc_show_clock, 0 },
+	{ "mm",     lsdc_show_mm,   0, NULL },
+};
+
+static void lsdc_debugfs_init(struct drm_minor *minor)
+{
+	drm_debugfs_create_files(lsdc_debugfs_list,
+				 ARRAY_SIZE(lsdc_debugfs_list),
+				 minor->debugfs_root,
+				 minor);
+}
+#endif
+
+static struct drm_gem_object *
+lsdc_drm_gem_create_object(struct drm_device *ddev, size_t size)
+{
+	struct drm_gem_cma_object *obj = kzalloc(sizeof(*obj), GFP_KERNEL);
+
+	if (!obj)
+		return ERR_PTR(-ENOMEM);
+
+	obj->map_noncoherent = true;
+
+	return &obj->base;
+}
+
+static int lsdc_gem_cma_dumb_create(struct drm_file *file,
+				    struct drm_device *ddev,
+				    struct drm_mode_create_dumb *args)
+{
+	struct lsdc_device *ldev = to_lsdc(ddev);
+	const struct lsdc_chip_desc *desc = ldev->desc;
+	unsigned int bytes_per_pixel = (args->bpp + 7) / 8;
+	unsigned int pitch = bytes_per_pixel * args->width;
+
+	/*
+	 * The dc in ls7a1000/ls2k1000/ls2k0500 require the stride be a
+	 * multiple of 256 bytes which is for sake of optimize dma data
+	 * transfer.
+	 */
+	args->pitch = roundup(pitch, desc->stride_alignment);
+
+	return drm_gem_cma_dumb_create_internal(file, ddev, args);
+}
+
+DEFINE_DRM_GEM_CMA_FOPS(lsdc_drv_fops);
+
+static const struct drm_driver lsdc_drm_driver_cma_stub = {
+	.driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC,
+	.lastclose = drm_fb_helper_lastclose,
+	.fops = &lsdc_drv_fops,
+	.gem_create_object = lsdc_drm_gem_create_object,
+
+	.name = DRIVER_NAME,
+	.desc = DRIVER_DESC,
+	.date = DRIVER_DATE,
+	.major = DRIVER_MAJOR,
+	.minor = DRIVER_MINOR,
+	.patchlevel = DRIVER_PATCHLEVEL,
+
+	DRM_GEM_CMA_DRIVER_OPS_WITH_DUMB_CREATE(lsdc_gem_cma_dumb_create),
+
+#ifdef CONFIG_DEBUG_FS
+	.debugfs_init = lsdc_debugfs_init,
+#endif
+};
+
+DEFINE_DRM_GEM_FOPS(lsdc_gem_fops);
+
+static const struct drm_driver lsdc_vram_driver_stub = {
+	.driver_features = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
+	.fops = &lsdc_gem_fops,
+
+	.name = DRIVER_NAME,
+	.desc = DRIVER_DESC,
+	.date = DRIVER_DATE,
+	.major = DRIVER_MAJOR,
+	.minor = DRIVER_MINOR,
+	.patchlevel = DRIVER_PATCHLEVEL,
+
+	DRM_GEM_VRAM_DRIVER,
+};
+
+static int lsdc_modeset_init(struct lsdc_device *ldev, const uint32_t num_crtc)
+{
+	struct drm_device *ddev = &ldev->drm;
+	unsigned int i;
+	int ret;
+
+	/* first, find all available connector, and take a record */
+	for (i = 0; i < num_crtc; i++) {
+		struct lsdc_display_pipe *const dispipe = &ldev->disp_pipe[i];
+		struct lsdc_connector *lconn = lsdc_connector_init(ldev, i);
+		/* Fail if the connector could not be initialized */
+		if (IS_ERR(lconn))
+			return PTR_ERR(lconn);
+
+		if (!lconn) {
+			dispipe->lconn = NULL;
+			dispipe->available = false;
+			continue;
+		}
+
+		dispipe->available = true;
+		dispipe->lconn = lconn;
+		ldev->num_output++;
+	}
+
+	drm_info(ddev, "number of outputs: %u\n", ldev->num_output);
+
+	for (i = 0; i < num_crtc; i++) {
+		struct lsdc_display_pipe * const dispipe = &ldev->disp_pipe[i];
+		struct drm_plane * const primary = &dispipe->primary;
+		struct drm_plane * const cursor = &dispipe->cursor;
+		struct drm_encoder * const encoder = &dispipe->encoder;
+		struct drm_crtc * const crtc = &dispipe->crtc;
+		struct lsdc_pll * const pixpll = &dispipe->pixpll;
+
+		dispipe->index = i;
+
+		ret = lsdc_pixpll_init(pixpll, ddev, i);
+		if (ret)
+			return ret;
+
+		ret = lsdc_plane_init(ldev, primary, DRM_PLANE_TYPE_PRIMARY, i);
+		if (ret)
+			return ret;
+
+		ret = lsdc_plane_init(ldev, cursor, DRM_PLANE_TYPE_CURSOR, i);
+		if (ret)
+			return ret;
+
+		/*
+		 * Initial all of the CRTC available, in this way the crtc
+		 * index is equal to the hardware crtc index. That is:
+		 * display pipe 0 = crtc0 + dvo0 + encoder0
+		 * display pipe 1 = crtc1 + dvo1 + encoder1
+		 */
+		ret = lsdc_crtc_init(ddev, crtc, i, primary, cursor);
+		if (ret)
+			return ret;
+
+		if (dispipe->available) {
+			ret = lsdc_encoder_init(encoder,
+						&dispipe->lconn->base,
+						ddev,
+						i,
+						ldev->num_output);
+			if (ret)
+				return ret;
+		}
+
+		drm_info(ddev, "display pipe %u initialized\n", i);
+	}
+
+	return 0;
+}
+
+static int lsdc_mode_config_init(struct lsdc_device *ldev)
+{
+	const struct lsdc_chip_desc * const descp = ldev->desc;
+	struct drm_device *ddev = &ldev->drm;
+	int ret;
+
+	spin_lock_init(&ldev->reglock);
+
+	drm_mode_config_init(ddev);
+
+	ddev->mode_config.funcs = &lsdc_mode_config_funcs;
+	ddev->mode_config.min_width = 1;
+	ddev->mode_config.min_height = 1;
+	ddev->mode_config.preferred_depth = 24;
+	ddev->mode_config.prefer_shadow = ldev->use_vram_helper;
+
+	ddev->mode_config.max_width = 4096;
+	ddev->mode_config.max_height = 4096;
+
+	ddev->mode_config.cursor_width = descp->hw_cursor_h;
+	ddev->mode_config.cursor_height = descp->hw_cursor_h;
+
+	if (ldev->vram_base)
+		ddev->mode_config.fb_base = ldev->vram_base;
+
+	ret = lsdc_modeset_init(ldev, descp->num_of_crtc);
+	if (ret)
+		goto out_mode_config;
+
+	drm_mode_config_reset(ddev);
+
+	return 0;
+
+out_mode_config:
+	drm_mode_config_cleanup(ddev);
+
+	return ret;
+}
+
+static void lsdc_mode_config_fini(struct drm_device *ddev)
+{
+	struct lsdc_device *ldev = to_lsdc(ddev);
+
+	/* disable output polling */
+	drm_kms_helper_poll_fini(ddev);
+
+	drm_dev_unregister(ddev);
+
+	devm_free_irq(ddev->dev, ldev->irq, ddev);
+
+	/* shutdown all CRTC, for driver unloading */
+	drm_atomic_helper_shutdown(ddev);
+
+	drm_mode_config_cleanup(ddev);
+}
+
+/*
+ * lsdc_determine_chip - a function to tell different chips apart.
+ */
+const static struct lsdc_chip_desc *
+lsdc_determine_chip(struct pci_dev *pdev, int *has)
+{
+	static const struct lsdc_match {
+		char name[128];
+		const void *data;
+	} compat[] = {
+		{ .name = "loongson,ls7a1000-dc", .data = &dc_in_ls7a1000 },
+		{ .name = "loongson,ls2k1000-dc", .data = &dc_in_ls2k1000 },
+		{ .name = "loongson,ls7a2000-dc", .data = &dc_in_ls7a2000 },
+		{ .name = "loongson,ls2k0500-dc", .data = &dc_in_ls2k0500 },
+		{ .name = "loongson,loongson64c-4core-ls7a", .data = &dc_in_ls7a1000 },
+		{ .name = "loongson,loongson64g-4core-ls7a", .data = &dc_in_ls7a1000 },
+		{ .name = "loongson,loongson64-2core-2k1000", .data = &dc_in_ls2k1000 },
+		{ .name = "loongson,loongson2k1000", .data = &dc_in_ls2k1000 },
+		{ /* sentinel */ },
+	};
+
+	struct device_node *np;
+	unsigned int i;
+
+	/* Deduce DC variant information from the DC device node */
+	for (i = 0; i < ARRAY_SIZE(compat); ++i) {
+		np = of_find_compatible_node(NULL, NULL, compat[i].name);
+		if (!np)
+			continue;
+
+		of_node_put(np);
+
+		return compat[i].data;
+	}
+
+	return NULL;
+}
+
+static int lsdc_drm_suspend(struct device *dev)
+{
+	struct drm_device *ddev = dev_get_drvdata(dev);
+
+	return drm_mode_config_helper_suspend(ddev);
+}
+
+static int lsdc_drm_resume(struct device *dev)
+{
+	struct drm_device *ddev = dev_get_drvdata(dev);
+
+	return drm_mode_config_helper_resume(ddev);
+}
+
+static int lsdc_pm_freeze(struct device *dev)
+{
+	return lsdc_drm_suspend(dev);
+}
+
+static int lsdc_pm_thaw(struct device *dev)
+{
+	return lsdc_drm_resume(dev);
+}
+
+static int lsdc_pm_suspend(struct device *dev)
+{
+	struct pci_dev *pdev = to_pci_dev(dev);
+	int error;
+
+	error = lsdc_pm_freeze(dev);
+	if (error)
+		return error;
+
+	pci_save_state(pdev);
+	/* Shut down the device */
+	pci_disable_device(pdev);
+	pci_set_power_state(pdev, PCI_D3hot);
+
+	return 0;
+}
+
+static int lsdc_pm_resume(struct device *dev)
+{
+	struct pci_dev *pdev = to_pci_dev(dev);
+
+	if (pcim_enable_device(pdev))
+		return -EIO;
+
+	pci_set_power_state(pdev, PCI_D0);
+
+	pci_restore_state(pdev);
+
+	return lsdc_pm_thaw(dev);
+}
+
+static const struct dev_pm_ops lsdc_pm_ops = {
+	.suspend = lsdc_pm_suspend,
+	.resume = lsdc_pm_resume,
+	.freeze = lsdc_pm_freeze,
+	.thaw = lsdc_pm_thaw,
+	.poweroff = lsdc_pm_freeze,
+	.restore = lsdc_pm_resume,
+};
+
+static int lsdc_remove_conflicting_framebuffers(const struct drm_driver *drv)
+{
+	/* lsdc is a pci device, but it don't have a dedicate vram bar because
+	 * of historic reason. The display controller is ported from Loongson
+	 * 2H series SoC which date back to 2012.
+	 * And simplefb node may have been located anywhere in memory.
+	 */
+	return drm_aperture_remove_conflicting_framebuffers(0, ~0, false, drv);
+}
+
+static int lsdc_vram_init(struct lsdc_device *ldev)
+{
+	struct drm_device *ddev = &ldev->drm;
+	struct pci_dev *gpu;
+	resource_size_t base, size;
+	int ret;
+
+	/* BAR 2 of LS7A1000's GPU contain VRAM, It's GC1000 */
+	gpu = pci_get_device(PCI_VENDOR_ID_LOONGSON, 0x7a15, NULL);
+	base = pci_resource_start(gpu, 2);
+	size =  pci_resource_len(gpu, 2);
+
+	drm_info(ddev, "vram start: 0x%llx, size: %uMB\n", base, (u32)(size >> 20));
+
+	if (!request_mem_region(base, size, "lsdc_vram")) {
+		drm_err(ddev, "can't reserve VRAM memory region\n");
+		return -ENXIO;
+	}
+
+	ret = drmm_vram_helper_init(ddev, base, size);
+	if (ret) {
+		drm_err(ddev, "can't init vram helper\n");
+		return ret;
+	}
+
+	ldev->vram_base = base;
+	ldev->vram_size = size;
+
+	return 0;
+}
+
+static int lsdc_pci_probe(struct pci_dev *pdev, const struct pci_device_id * const ent)
+{
+	const struct drm_driver *driver = &lsdc_drm_driver_cma_stub;
+	int has_dedicated_vram = 0;
+	struct lsdc_device *ldev;
+	struct drm_device *ddev;
+	const struct lsdc_chip_desc *descp;
+	int ret;
+
+	if (ent->driver_data == LSDC_CHIP_7A2000) {
+		descp = &dc_in_ls7a2000;
+	} else {
+		descp = lsdc_determine_chip(pdev, &has_dedicated_vram);
+		if (!descp) {
+			dev_err(&pdev->dev, "unknown dc ip core, abort\n");
+			return -ENOENT;
+		}
+	}
+
+	lsdc_remove_conflicting_framebuffers(driver);
+
+	ret = pcim_enable_device(pdev);
+	if (ret)
+		return ret;
+
+	pci_set_master(pdev);
+
+	/* Get the optional framebuffer memory resource */
+	ret = of_reserved_mem_device_init(&pdev->dev);
+	if (ret && (ret != -ENODEV))
+		return ret;
+
+	if (lsdc_use_vram_helper > 0) {
+		driver = &lsdc_vram_driver_stub;
+	} else if ((lsdc_use_vram_helper < 0) && descp->has_vram) {
+		lsdc_use_vram_helper = 1;
+		driver = &lsdc_vram_driver_stub;
+	} else {
+		driver = &lsdc_drm_driver_cma_stub;
+	}
+
+	ldev = devm_drm_dev_alloc(&pdev->dev, driver, struct lsdc_device, drm);
+	if (IS_ERR(ldev))
+		return PTR_ERR(ldev);
+
+	ldev->use_vram_helper = lsdc_use_vram_helper;
+	ldev->desc = descp;
+
+	/* BAR 0 contains registers */
+	ldev->reg_base = devm_ioremap_resource(&pdev->dev, &pdev->resource[0]);
+	if (IS_ERR(ldev->reg_base))
+		return PTR_ERR(ldev->reg_base);
+
+	if (descp->has_vram && ldev->use_vram_helper)
+		lsdc_vram_init(ldev);
+
+	ddev = &ldev->drm;
+	pci_set_drvdata(pdev, ddev);
+
+	ret = lsdc_mode_config_init(ldev);
+	if (ret)
+		goto err_out;
+
+	ldev->irq = pdev->irq;
+
+	drm_info(&ldev->drm, "irq = %d\n", ldev->irq);
+
+	ret = devm_request_threaded_irq(&pdev->dev,
+					pdev->irq,
+					lsdc_irq_handler_cb,
+					lsdc_irq_thread_cb,
+					IRQF_ONESHOT,
+					dev_name(&pdev->dev),
+					ddev);
+	if (ret) {
+		dev_err(&pdev->dev, "Failed to register lsdc interrupt\n");
+		goto err_out;
+	}
+
+	ret = drm_vblank_init(ddev, ldev->desc->num_of_crtc);
+	if (ret) {
+		dev_err(&pdev->dev, "Fatal error during vblank init: %d\n", ret);
+		goto err_out;
+	}
+
+	/* Initialize and enable output polling */
+	drm_kms_helper_poll_init(ddev);
+
+	ret = drm_dev_register(ddev, 0);
+	if (ret)
+		goto err_out;
+
+	drm_fbdev_generic_setup(ddev, 32);
+
+	return 0;
+
+err_out:
+	drm_dev_put(ddev);
+
+	return ret;
+}
+
+static void lsdc_pci_remove(struct pci_dev *pdev)
+{
+	struct drm_device *ddev = pci_get_drvdata(pdev);
+
+	lsdc_mode_config_fini(ddev);
+
+	drm_dev_put(ddev);
+
+	pci_clear_master(pdev);
+
+	pci_release_regions(pdev);
+}
+
+static const struct pci_device_id lsdc_pciid_list[] = {
+	{PCI_VENDOR_ID_LOONGSON, 0x7a06, PCI_ANY_ID, PCI_ANY_ID, 0, 0, 0},
+	{PCI_VENDOR_ID_LOONGSON, 0x7a36, PCI_ANY_ID, PCI_ANY_ID, 0, 0, (kernel_ulong_t)LSDC_CHIP_7A2000},
+	{0, 0, 0, 0, 0, 0, 0}
+};
+
+static struct pci_driver lsdc_pci_driver = {
+	.name = DRIVER_NAME,
+	.id_table = lsdc_pciid_list,
+	.probe = lsdc_pci_probe,
+	.remove = lsdc_pci_remove,
+	.driver.pm = &lsdc_pm_ops,
+};
+
+static int __init lsdc_drm_init(void)
+{
+	struct pci_dev *pdev = NULL;
+
+	if (drm_firmware_drivers_only())
+		return -EINVAL;
+
+	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev))) {
+		/*
+		 * Multiple video card workaround
+		 *
+		 * This integrated video card will always be selected as
+		 * default boot device by vgaarb subsystem.
+		 */
+		if (pdev->vendor != PCI_VENDOR_ID_LOONGSON) {
+			pr_info("Discrete graphic card detected, abort\n");
+			return 0;
+		}
+	}
+
+	return pci_register_driver(&lsdc_pci_driver);
+}
+module_init(lsdc_drm_init);
+
+static void __exit lsdc_drm_exit(void)
+{
+	pci_unregister_driver(&lsdc_pci_driver);
+}
+module_exit(lsdc_drm_exit);
+
+MODULE_DEVICE_TABLE(pci, lsdc_pciid_list);
+MODULE_AUTHOR(DRIVER_AUTHOR);
+MODULE_DESCRIPTION(DRIVER_DESC);
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/gpu/drm/lsdc/lsdc_drv.h b/drivers/gpu/drm/lsdc/lsdc_drv.h
new file mode 100644
index 000000000000..2b4a504aa223
--- /dev/null
+++ b/drivers/gpu/drm/lsdc/lsdc_drv.h
@@ -0,0 +1,209 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * KMS driver for Loongson display controller
+ *
+ * Copyright (C) 2020-2022, Sui Jingfeng <15330273260@189.cn>
+ *
+ */
+
+/*
+ * Authors:
+ *      Sui Jingfeng <suijingfeng@loongson.cn>
+ */
+
+#ifndef __LSDC_DRV_H__
+#define __LSDC_DRV_H__
+
+#include <drm/drm_print.h>
+#include <drm/drm_device.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_plane.h>
+#include <drm/drm_encoder.h>
+#include <drm/drm_drv.h>
+#include <drm/drm_atomic.h>
+
+#include "lsdc_regs.h"
+#include "lsdc_pll.h"
+
+#define LSDC_NUM_CRTC           2
+
+/* There is only a 1:1 mapping of encoders and connectors for lsdc,
+ * Each CRTC have two FB address registers.
+ *
+ * The display controller in LS2K1000/LS2K0500.
+ *       ___________________                                     _________
+ *      |            -------|                                   |         |
+ *      |  CRTC0 --> | DVO0 ----> Encoder0 ---> Connector0 ---> | Monotor |
+ *      |  _   _     -------|        ^              ^           |_________|
+ *      | | | | |           |        |              |
+ *      | |_| |_|           |     +------+          |
+ *      |                   <---->| i2c0 |<---------+
+ *      |          LSDC     |     +------+
+ *      |  _   _            |     +------+
+ *      | | | | |           <---->| i2c1 |----------+
+ *      | |_| |_|           |     +------+          |            _________
+ *      |            -------|        |              |           |         |
+ *      |  CRTC1 --> | DVO1 ----> Encoder1 ---> Connector1 ---> |  Panel  |
+ *      |            -------|                                   |_________|
+ *      |___________________|
+ *
+ *
+ * The display controller in LS7A1000.
+ *       ___________________                                     _________
+ *      |            -------|                                   |         |
+ *      |  CRTC0 --> | DVO0 ----> Encoder0 ---> Connector0 ---> | Monotor |
+ *      |  _   _     -------|        ^             ^            |_________|
+ *      | | | | |    -------|        |             |
+ *      | |_| |_|    | i2c0 <--------+-------------+
+ *      |            -------|
+ *      |  _   _     -------|
+ *      | | | | |    | i2c1 <--------+-------------+
+ *      | |_| |_|    -------|        |             |             _________
+ *      |            -------|        |             |            |         |
+ *      |  CRTC1 --> | DVO1 ----> Encoder1 ---> Connector1 ---> |  Panel  |
+ *      |            -------|                                   |_________|
+ *      |___________________|
+ */
+
+enum loongson_dc_family {
+	LSDC_CHIP_UNKNOWN = 0,
+	LSDC_CHIP_2K1000 = 1,  /* 2-Core Mips64r2 SoC, 64-bit */
+	LSDC_CHIP_7A1000 = 2,  /* North bridge of LS3A3000/LS3A4000/LS3A5000 */
+	LSDC_CHIP_2K0500 = 3,  /* Reduced version of LS2K1000, single core */
+	LSDC_CHIP_7A2000 = 4,  /* Enhancement version of 7A1000 */
+	LSDC_CHIP_LAST,
+};
+
+enum lsdc_pixel_format {
+	LSDC_PF_NONE = 0,
+	LSDC_PF_ARGB4444 = 1,  /* ARGB A:4 bits R/G/B: 4 bits each [16 bits] */
+	LSDC_PF_ARGB1555 = 2,  /* ARGB A:1 bit RGB:15 bits [16 bits] */
+	LSDC_PF_RGB565 = 3,    /* RGB [16 bits] */
+	LSDC_PF_XRGB8888 = 4,  /* XRGB [32 bits] */
+};
+
+struct lsdc_chip_desc {
+	enum loongson_dc_family chip;
+	u32 num_of_crtc;
+	u32 max_pixel_clk;
+	u32 max_width;
+	u32 max_height;
+	u32 num_of_hw_cursor;
+	u32 hw_cursor_w;
+	u32 hw_cursor_h;
+	u32 stride_alignment;
+	bool have_builtin_i2c;
+	bool has_vram;
+};
+
+/*
+ * struct lsdc_display_pipe - Abstraction of hardware display pipeline.
+ * @crtc: CRTC control structure
+ * @plane: Plane control structure
+ * @encoder: Encoder control structure
+ * @pixpll: Pll control structure
+ * @connector: point to connector control structure this display pipe bind
+ * @index: the index corresponding to the hardware display pipe
+ * @available: is this display pipe is available on the motherboard, The
+ *  downstream mother board manufacturer may use only one of them.
+ *  For example, LEMOTE LX-6901 board just has only one VGA output.
+ *
+ * Display pipeline with plane, crtc, encoder, PLL collapsed into one entity.
+ */
+struct lsdc_display_pipe {
+	struct drm_crtc crtc;
+	struct drm_plane primary;
+	struct drm_plane cursor;
+	struct drm_encoder encoder;
+	struct lsdc_pll pixpll;
+	struct lsdc_connector *lconn;
+
+	int index;
+	bool available;
+};
+
+struct lsdc_crtc_state {
+	struct drm_crtc_state base;
+	struct lsdc_pll_core_values pparams;
+};
+
+struct lsdc_device {
+	struct drm_device drm;
+
+	/* LS7A1000 has a dediacted video RAM, typically 64 MB or more */
+	void __iomem *reg_base;
+	void __iomem *vram;
+	resource_size_t vram_base;
+	resource_size_t vram_size;
+
+	struct lsdc_display_pipe disp_pipe[LSDC_NUM_CRTC];
+
+	/*
+	 * @num_output: count the number of active display pipe.
+	 */
+	unsigned int num_output;
+
+	/* @desc: device dependent data and feature descriptions */
+	const struct lsdc_chip_desc *desc;
+
+	/* @reglock: protects concurrent register access */
+	spinlock_t reglock;
+
+	/*
+	 * @use_vram_helper: using vram helper base solution instead of
+	 * CMA helper based solution. The DC scanout from the VRAM is
+	 * proved to be more reliable, but graphic application is may
+	 * become slow when using this driver mode.
+	 */
+	bool use_vram_helper;
+
+	int irq;
+	u32 irq_status;
+};
+
+#define to_lsdc(x) container_of(x, struct lsdc_device, drm)
+
+static inline struct lsdc_crtc_state *
+to_lsdc_crtc_state(struct drm_crtc_state *base)
+{
+	return container_of(base, struct lsdc_crtc_state, base);
+}
+
+static inline u32 lsdc_reg_read32(struct lsdc_device * const ldev, u32 offset)
+{
+	u32 val;
+	unsigned long flags;
+
+	spin_lock_irqsave(&ldev->reglock, flags);
+	val = readl(ldev->reg_base + offset);
+	spin_unlock_irqrestore(&ldev->reglock, flags);
+
+	return val;
+}
+
+static inline void
+lsdc_reg_write32(struct lsdc_device * const ldev, u32 offset, u32 val)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&ldev->reglock, flags);
+	writel(val, ldev->reg_base + offset);
+	spin_unlock_irqrestore(&ldev->reglock, flags);
+}
+
+int lsdc_crtc_init(struct drm_device *ddev,
+		   struct drm_crtc *crtc,
+		   unsigned int index,
+		   struct drm_plane *primary,
+		   struct drm_plane *cursor);
+
+int lsdc_plane_init(struct lsdc_device *ldev, struct drm_plane *plane,
+		    enum drm_plane_type type, unsigned int index);
+
+int lsdc_encoder_init(struct drm_encoder * const encoder,
+		      struct drm_connector *connector,
+		      struct drm_device *ddev,
+		      unsigned int index,
+		      unsigned int total);
+
+#endif
diff --git a/drivers/gpu/drm/lsdc/lsdc_encoder.c b/drivers/gpu/drm/lsdc/lsdc_encoder.c
new file mode 100644
index 000000000000..0fd68d2f99c4
--- /dev/null
+++ b/drivers/gpu/drm/lsdc/lsdc_encoder.c
@@ -0,0 +1,54 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * KMS driver for Loongson display controller
+ *
+ * Copyright (C) 2020-2022, Sui Jingfeng <15330273260@189.cn>
+ *
+ */
+
+/*
+ * Authors:
+ *      Sui Jingfeng <suijingfeng@loongson.cn>
+ */
+
+#include "lsdc_drv.h"
+
+static const struct drm_encoder_funcs lsdc_encoder_funcs = {
+	.destroy = drm_encoder_cleanup,
+};
+
+int lsdc_encoder_init(struct drm_encoder * const encoder,
+		      struct drm_connector *connector,
+		      struct drm_device *ddev,
+		      unsigned int index,
+		      unsigned int total)
+{
+	int ret;
+	int type;
+
+	encoder->possible_crtcs = BIT(index);
+
+	if (total == 2)
+		encoder->possible_clones = BIT(1) | BIT(0);
+	else if (total < 2)
+		encoder->possible_clones = 0;
+
+	if (connector->connector_type == DRM_MODE_CONNECTOR_VGA)
+		type = DRM_MODE_ENCODER_DAC;
+	else if ((connector->connector_type == DRM_MODE_CONNECTOR_HDMIA) ||
+		 (connector->connector_type == DRM_MODE_CONNECTOR_HDMIB) ||
+		 (connector->connector_type == DRM_MODE_CONNECTOR_DVID))
+		type = DRM_MODE_ENCODER_TMDS;
+	else if (connector->connector_type == DRM_MODE_CONNECTOR_DPI)
+		type = DRM_MODE_ENCODER_DPI;
+	else if (connector->connector_type == DRM_MODE_CONNECTOR_VIRTUAL)
+		type = DRM_MODE_ENCODER_VIRTUAL;
+	else
+		type = DRM_MODE_ENCODER_NONE;
+
+	ret = drm_encoder_init(ddev, encoder, &lsdc_encoder_funcs, type, "encoder%d", index);
+	if (ret)
+		return ret;
+
+	return drm_connector_attach_encoder(connector, encoder);
+}
diff --git a/drivers/gpu/drm/lsdc/lsdc_i2c.c b/drivers/gpu/drm/lsdc/lsdc_i2c.c
new file mode 100644
index 000000000000..79f013014598
--- /dev/null
+++ b/drivers/gpu/drm/lsdc/lsdc_i2c.c
@@ -0,0 +1,198 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * KMS driver for Loongson display controller
+ *
+ * Copyright (C) 2020-2022, Sui Jingfeng <15330273260@189.cn>
+ *
+ */
+
+/*
+ * Authors:
+ *      Sui Jingfeng <suijingfeng@loongson.cn>
+ */
+
+#include <linux/string.h>
+#include <linux/i2c.h>
+
+#include "lsdc_drv.h"
+#include "lsdc_regs.h"
+#include "lsdc_i2c.h"
+
+/*
+ * ls7a_gpio_i2c_set - set the state of a gpio pin indicated by mask
+ * @mask: gpio pin mask
+ */
+static void ls7a_gpio_i2c_set(struct lsdc_i2c * const i2c, int mask, int state)
+{
+	struct lsdc_device *ldev = to_lsdc(i2c->ddev);
+	u8 val;
+	unsigned long flags;
+
+	spin_lock_irqsave(&ldev->reglock, flags);
+
+	if (state) {
+		val = readb(i2c->dir_reg);
+		val |= mask;
+		writeb(val, i2c->dir_reg);
+	} else {
+		val = readb(i2c->dir_reg);
+		val &= ~mask;
+		writeb(val, i2c->dir_reg);
+
+		val = readb(i2c->dat_reg);
+		if (state)
+			val |= mask;
+		else
+			val &= ~mask;
+		writeb(val, i2c->dat_reg);
+	}
+
+	spin_unlock_irqrestore(&ldev->reglock, flags);
+}
+
+/*
+ * ls7a_gpio_i2c_get - read value back from gpio pin
+ * @mask: gpio pin mask
+ */
+static int ls7a_gpio_i2c_get(struct lsdc_i2c * const i2c, int mask)
+{
+	struct lsdc_device *ldev = to_lsdc(i2c->ddev);
+	u8 val;
+	unsigned long flags;
+
+	spin_lock_irqsave(&ldev->reglock, flags);
+
+	/* first set this pin as input */
+	val = readb(i2c->dir_reg);
+	val |= mask;
+	writeb(val, i2c->dir_reg);
+
+	/* then get level state from this pin */
+	val = readb(i2c->dat_reg);
+
+	spin_unlock_irqrestore(&ldev->reglock, flags);
+
+	return (val & mask) ? 1 : 0;
+}
+
+/* set the state on the i2c->sda pin */
+static void ls7a_i2c_set_sda(void *i2c, int state)
+{
+	struct lsdc_i2c * const li2c = (struct lsdc_i2c *)i2c;
+
+	return ls7a_gpio_i2c_set(li2c, li2c->sda, state);
+}
+
+/* set the state on the i2c->scl pin */
+static void ls7a_i2c_set_scl(void *i2c, int state)
+{
+	struct lsdc_i2c * const li2c = (struct lsdc_i2c *)i2c;
+
+	return ls7a_gpio_i2c_set(li2c, li2c->scl, state);
+}
+
+/* read the value from the i2c->sda pin */
+static int ls7a_i2c_get_sda(void *i2c)
+{
+	struct lsdc_i2c * const li2c = (struct lsdc_i2c *)i2c;
+
+	return ls7a_gpio_i2c_get(li2c, li2c->sda);
+}
+
+/* read the value from the i2c->scl pin */
+static int ls7a_i2c_get_scl(void *i2c)
+{
+	struct lsdc_i2c * const li2c = (struct lsdc_i2c *)i2c;
+
+	return ls7a_gpio_i2c_get(li2c, li2c->scl);
+}
+
+/*
+ * Get i2c id from connector id
+ *
+ * TODO: get it from dtb
+ */
+static int lsdc_get_i2c_id(struct drm_device *ddev, unsigned int index)
+{
+	return index;
+}
+
+/*
+ * mainly for dc in ls7a1000 which have builtin gpio emulated i2c
+ *
+ * @index : output channel index, 0 for DVO0, 1 for DVO1
+ */
+struct i2c_adapter *lsdc_create_i2c_chan(struct drm_device *ddev,
+					 unsigned int index)
+{
+	struct lsdc_device *ldev = to_lsdc(ddev);
+	struct i2c_adapter *adapter;
+	struct lsdc_i2c *li2c;
+	int ret;
+
+	li2c = devm_kzalloc(ddev->dev, sizeof(*li2c), GFP_KERNEL);
+	if (!li2c)
+		return ERR_PTR(-ENOMEM);
+
+	li2c->ddev = ddev;
+
+	if (index == 0) {
+		li2c->sda = 0x01;
+		li2c->scl = 0x02;
+	} else if (index == 1) {
+		li2c->sda = 0x04;
+		li2c->scl = 0x08;
+	}
+
+	li2c->dir_reg = ldev->reg_base + LS7A_DC_GPIO_DIR_REG;
+	li2c->dat_reg = ldev->reg_base + LS7A_DC_GPIO_DAT_REG;
+
+	li2c->bit.setsda = ls7a_i2c_set_sda;
+	li2c->bit.setscl = ls7a_i2c_set_scl;
+	li2c->bit.getsda = ls7a_i2c_get_sda;
+	li2c->bit.getscl = ls7a_i2c_get_scl;
+	li2c->bit.udelay = 5;
+	li2c->bit.timeout = usecs_to_jiffies(2200); /* from VESA */
+	li2c->bit.data = li2c;
+
+	adapter = &li2c->adapter;
+
+	adapter->algo_data = &li2c->bit;
+	adapter->owner = THIS_MODULE;
+	adapter->class = I2C_CLASS_DDC;
+	adapter->dev.parent = ddev->dev;
+	adapter->nr = -1;
+
+	snprintf(adapter->name, sizeof(adapter->name), "%s-%d", "lsdc_gpio_i2c", index);
+
+	i2c_set_adapdata(adapter, li2c);
+
+	ret = i2c_bit_add_numbered_bus(adapter);
+	if (ret) {
+		devm_kfree(ddev->dev, li2c);
+		return ERR_PTR(ret);
+	}
+
+	return adapter;
+}
+
+/*
+ * lsdc_get_i2c_adapter - get a i2c adapter from i2c susystem.
+ *
+ * @index : output channel index, 0 for DVO0, 1 for DVO1
+ */
+struct i2c_adapter *lsdc_get_i2c_adapter(struct drm_device *ddev,
+					 unsigned int index)
+{
+	unsigned int i2c_id;
+
+	/* find mapping between i2c id and connector id */
+	i2c_id = lsdc_get_i2c_id(ddev, index);
+
+	return i2c_get_adapter(i2c_id);
+}
+
+void lsdc_destroy_i2c(struct drm_device *ddev, struct i2c_adapter *adapter)
+{
+	i2c_put_adapter(adapter);
+}
diff --git a/drivers/gpu/drm/lsdc/lsdc_i2c.h b/drivers/gpu/drm/lsdc/lsdc_i2c.h
new file mode 100644
index 000000000000..9a033b036121
--- /dev/null
+++ b/drivers/gpu/drm/lsdc/lsdc_i2c.h
@@ -0,0 +1,40 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * KMS driver for Loongson display controller
+ *
+ * Copyright (C) 2020, Sui Jingfeng <15330273260@189.cn>
+ *
+ */
+
+/*
+ * Authors:
+ *      Sui Jingfeng <suijingfeng@loongson.cn>
+ */
+
+#ifndef __LSDC_I2C__
+#define __LSDC_I2C__
+
+#include <linux/i2c.h>
+#include <linux/i2c-algo-bit.h>
+
+struct lsdc_i2c {
+	struct drm_device *ddev;
+	struct i2c_adapter adapter;
+	struct i2c_algo_bit_data bit;
+	/* pin bit mask */
+	u8 sda;
+	u8 scl;
+
+	void __iomem *dir_reg;
+	void __iomem *dat_reg;
+};
+
+void lsdc_destroy_i2c(struct drm_device *ddev, struct i2c_adapter *i2c);
+
+struct i2c_adapter *lsdc_create_i2c_chan(struct drm_device *ddev,
+					 unsigned int con_id);
+
+struct i2c_adapter *lsdc_get_i2c_adapter(struct drm_device *ddev,
+					 unsigned int con_id);
+
+#endif
diff --git a/drivers/gpu/drm/lsdc/lsdc_irq.c b/drivers/gpu/drm/lsdc/lsdc_irq.c
new file mode 100644
index 000000000000..8c16cdd82e8b
--- /dev/null
+++ b/drivers/gpu/drm/lsdc/lsdc_irq.c
@@ -0,0 +1,60 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * KMS driver for Loongson display controller
+ *
+ * Copyright (C) 2020-2022, Sui Jingfeng <15330273260@189.cn>
+ *
+ */
+
+/*
+ * Authors:
+ *      Sui Jingfeng <suijingfeng@loongson.cn>
+ */
+
+#include <drm/drm_vblank.h>
+
+#include "lsdc_drv.h"
+#include "lsdc_regs.h"
+#include "lsdc_irq.h"
+
+/* Function to be called in a threaded interrupt context. */
+irqreturn_t lsdc_irq_thread_cb(int irq, void *arg)
+{
+	struct drm_device *ddev = arg;
+	struct lsdc_device *ldev = to_lsdc(ddev);
+	struct drm_crtc *crtc;
+
+	/* trigger the vblank event */
+	if (ldev->irq_status & INT_CRTC0_VS) {
+		crtc = drm_crtc_from_index(ddev, 0);
+		drm_crtc_handle_vblank(crtc);
+	}
+
+	if (ldev->irq_status & INT_CRTC1_VS) {
+		crtc = drm_crtc_from_index(ddev, 1);
+		drm_crtc_handle_vblank(crtc);
+	}
+
+	lsdc_reg_write32(ldev, LSDC_INT_REG, INT_CRTC0_VS_EN | INT_CRTC1_VS_EN);
+
+	return IRQ_HANDLED;
+}
+
+/* Function to be called when the IRQ occurs */
+irqreturn_t lsdc_irq_handler_cb(int irq, void *arg)
+{
+	struct drm_device *ddev = arg;
+	struct lsdc_device *ldev = to_lsdc(ddev);
+
+	/* Read & Clear the interrupt status */
+	ldev->irq_status = lsdc_reg_read32(ldev, LSDC_INT_REG);
+	if ((ldev->irq_status & INT_STATUS_MASK) == 0) {
+		drm_warn(ddev, "no interrupt occurs\n");
+		return IRQ_NONE;
+	}
+
+	/* clear all interrupt */
+	lsdc_reg_write32(ldev, LSDC_INT_REG, ldev->irq_status);
+
+	return IRQ_WAKE_THREAD;
+}
diff --git a/drivers/gpu/drm/lsdc/lsdc_irq.h b/drivers/gpu/drm/lsdc/lsdc_irq.h
new file mode 100644
index 000000000000..1e1acd4c8aac
--- /dev/null
+++ b/drivers/gpu/drm/lsdc/lsdc_irq.h
@@ -0,0 +1,20 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * KMS driver for Loongson display controller
+ *
+ * Copyright (C) 2020, Sui Jingfeng <15330273260@189.cn>
+ *
+ */
+
+/*
+ * Authors:
+ *      Sui Jingfeng <suijingfeng@loongson.cn>
+ */
+
+#ifndef __LSDC_IRQ_H__
+#define __LSDC_IRQ_H__
+
+irqreturn_t lsdc_irq_thread_cb(int irq, void *arg);
+irqreturn_t lsdc_irq_handler_cb(int irq, void *arg);
+
+#endif
diff --git a/drivers/gpu/drm/lsdc/lsdc_plane.c b/drivers/gpu/drm/lsdc/lsdc_plane.c
new file mode 100644
index 000000000000..470420a13635
--- /dev/null
+++ b/drivers/gpu/drm/lsdc/lsdc_plane.c
@@ -0,0 +1,526 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * KMS driver for Loongson display controller
+ *
+ * Copyright (C) 2020-2022, Sui Jingfeng <15330273260@189.cn>
+ *
+ */
+
+/*
+ * Authors:
+ *      Sui Jingfeng <suijingfeng@loongson.cn>
+ */
+
+#include <drm/drm_print.h>
+#include <drm/drm_device.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_plane.h>
+#include <drm/drm_drv.h>
+
+#include <drm/drm_atomic.h>
+#include <drm/drm_vblank.h>
+#include <drm/drm_format_helper.h>
+#include <drm/drm_plane_helper.h>
+#include <drm/drm_fb_cma_helper.h>
+#include <drm/drm_gem_cma_helper.h>
+#include <drm/drm_gem_vram_helper.h>
+#include <drm/drm_atomic_helper.h>
+#include <drm/drm_gem_framebuffer_helper.h>
+#include <drm/drm_gem_atomic_helper.h>
+#include <drm/drm_damage_helper.h>
+
+#include "lsdc_drv.h"
+#include "lsdc_regs.h"
+#include "lsdc_pll.h"
+
+static const u32 lsdc_primary_formats[] = {
+	DRM_FORMAT_RGB565,
+	DRM_FORMAT_XRGB8888,
+	DRM_FORMAT_ARGB8888,
+};
+
+static const u32 lsdc_cursor_formats[] = {
+	DRM_FORMAT_ARGB8888,
+};
+
+static const u64 lsdc_fb_format_modifiers[] = {
+	DRM_FORMAT_MOD_LINEAR,
+	DRM_FORMAT_MOD_INVALID
+};
+
+static void lsdc_update_fb_format(struct lsdc_device *ldev,
+				  struct drm_crtc *crtc,
+				  const struct drm_format_info *fmt_info)
+{
+	unsigned int index = drm_crtc_index(crtc);
+	u32 val = 0;
+	u32 fmt;
+
+	switch (fmt_info->format) {
+	case DRM_FORMAT_RGB565:
+		fmt = LSDC_PF_RGB565;
+		break;
+	case DRM_FORMAT_XRGB8888:
+		fmt = LSDC_PF_XRGB8888;
+		break;
+	case DRM_FORMAT_ARGB8888:
+		fmt = LSDC_PF_XRGB8888;
+		break;
+	default:
+		fmt = LSDC_PF_XRGB8888;
+		break;
+	}
+
+	if (index == 0) {
+		val = lsdc_reg_read32(ldev, LSDC_CRTC0_CFG_REG);
+		val = (val & ~CFG_PIX_FMT_MASK) | fmt;
+		lsdc_reg_write32(ldev, LSDC_CRTC0_CFG_REG, val);
+	} else if (index == 1) {
+		val = lsdc_reg_read32(ldev, LSDC_CRTC1_CFG_REG);
+		val = (val & ~CFG_PIX_FMT_MASK) | fmt;
+		lsdc_reg_write32(ldev, LSDC_CRTC1_CFG_REG, val);
+	}
+}
+
+static void lsdc_update_fb_start_addr(struct lsdc_device *ldev,
+				      struct drm_crtc *crtc,
+				      u64 paddr)
+{
+	unsigned int index = drm_crtc_index(crtc);
+	u32 addr_reg;
+	u32 cfg_reg;
+	u32 val;
+
+	/*
+	 * Find which framebuffer address register should update.
+	 * if FB_ADDR0_REG is in using, we write the addr to FB_ADDR1_REG,
+	 * if FB_ADDR1_REG is in using, we write the addr to FB_ADDR0_REG
+	 */
+	if (index == 0) {
+		/* CRTC0 */
+		val = lsdc_reg_read32(ldev, LSDC_CRTC0_CFG_REG);
+
+		cfg_reg = LSDC_CRTC0_CFG_REG;
+
+		if (val & CFG_FB_IDX_BIT) {
+			addr_reg = LSDC_CRTC0_FB_ADDR0_REG;
+			drm_dbg(&ldev->drm, "CRTC0 FB0 will be use\n");
+		} else {
+			addr_reg = LSDC_CRTC0_FB_ADDR1_REG;
+			drm_dbg(&ldev->drm, "CRTC0 FB1 will be use\n");
+		}
+	} else if (index == 1) {
+		/* CRTC1 */
+		val = lsdc_reg_read32(ldev, LSDC_CRTC1_CFG_REG);
+
+		cfg_reg = LSDC_CRTC1_CFG_REG;
+
+		if (val & CFG_FB_IDX_BIT) {
+			addr_reg = LSDC_CRTC1_FB_ADDR0_REG;
+			drm_dbg(&ldev->drm, "CRTC1 FB0 will be use\n");
+		} else {
+			addr_reg = LSDC_CRTC1_FB_ADDR1_REG;
+			drm_dbg(&ldev->drm, "CRTC1 FB1 will be use\n");
+		}
+	}
+
+	lsdc_reg_write32(ldev, addr_reg, paddr);
+
+	/*
+	 * Then, we triger the fb switch, the switch of the framebuffer
+	 * to be scanout will complete at the next vblank.
+	 */
+	lsdc_reg_write32(ldev, cfg_reg, val | CFG_PAGE_FLIP_BIT);
+
+	drm_dbg(&ldev->drm, "crtc%u scantout from 0x%llx\n", index, paddr);
+}
+
+static unsigned int lsdc_get_fb_offset(struct drm_framebuffer *fb,
+				       struct drm_plane_state *state,
+				       unsigned int plane)
+{
+	unsigned int offset = fb->offsets[plane];
+
+	offset += fb->format->cpp[plane] * (state->src_x >> 16);
+	offset += fb->pitches[plane] * (state->src_y >> 16);
+
+	return offset;
+}
+
+static s64 lsdc_get_vram_bo_offset(struct drm_framebuffer *fb)
+{
+	struct drm_gem_vram_object *gbo;
+	s64 gpu_addr;
+
+	gbo = drm_gem_vram_of_gem(fb->obj[0]);
+	gpu_addr = drm_gem_vram_offset(gbo);
+
+	return gpu_addr;
+}
+
+static int lsdc_pixpll_atomic_check(struct drm_crtc *crtc,
+				    struct drm_crtc_state *state)
+{
+	struct lsdc_display_pipe *dispipe = container_of(crtc, struct lsdc_display_pipe, crtc);
+	struct lsdc_pll *pixpll = &dispipe->pixpll;
+	const struct lsdc_pixpll_funcs *pfuncs = pixpll->funcs;
+	struct lsdc_crtc_state *priv_state = to_lsdc_crtc_state(state);
+	bool ret = pfuncs->compute(pixpll, state->mode.clock, &priv_state->pparams);
+
+	if (ret)
+		return 0;
+
+	drm_warn(crtc->dev, "failed find PLL parameters for %u\n", state->mode.clock);
+
+	return -EINVAL;
+}
+
+static int lsdc_primary_plane_atomic_check(struct drm_plane *plane,
+					   struct drm_atomic_state *state)
+{
+	struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state, plane);
+	struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state, plane);
+	struct drm_framebuffer *new_fb = new_plane_state->fb;
+	struct drm_framebuffer *old_fb = old_plane_state->fb;
+	struct drm_crtc *crtc = new_plane_state->crtc;
+	u32 new_format = new_fb->format->format;
+	struct drm_crtc_state *new_crtc_state;
+	int ret;
+
+	if (!crtc)
+		return 0;
+
+	new_crtc_state = drm_atomic_get_new_crtc_state(state, crtc);
+	if (WARN_ON(!new_crtc_state))
+		return -EINVAL;
+
+	/*
+	 * Require full modeset if enabling or disabling a plane,
+	 * or changing its position, size, depth or format.
+	 */
+	if ((!new_fb || !old_fb ||
+	     old_plane_state->crtc_x != new_plane_state->crtc_x ||
+	     old_plane_state->crtc_y != new_plane_state->crtc_y ||
+	     old_plane_state->crtc_w != new_plane_state->crtc_w ||
+	     old_plane_state->crtc_h != new_plane_state->crtc_h ||
+	     old_fb->format->format != new_format))
+		new_crtc_state->mode_changed = true;
+
+	if (new_crtc_state->mode_changed) {
+		ret = lsdc_pixpll_atomic_check(crtc, new_crtc_state);
+		if (ret != 0)
+			return ret;
+	}
+
+	return drm_atomic_helper_check_plane_state(new_plane_state,
+						   new_crtc_state,
+						   DRM_PLANE_HELPER_NO_SCALING,
+						   DRM_PLANE_HELPER_NO_SCALING,
+						   false, true);
+}
+
+static void lsdc_update_stride(struct lsdc_device *ldev,
+			       struct drm_crtc *crtc,
+			       unsigned int stride)
+{
+	unsigned int index = drm_crtc_index(crtc);
+
+	if (index == 0)
+		lsdc_reg_write32(ldev, LSDC_CRTC0_STRIDE_REG, stride);
+	else if (index == 1)
+		lsdc_reg_write32(ldev, LSDC_CRTC1_STRIDE_REG, stride);
+
+	drm_dbg(&ldev->drm, "update stride to %u\n", stride);
+}
+
+static void lsdc_primary_plane_atomic_update(struct drm_plane *plane,
+					     struct drm_atomic_state *state)
+{
+	struct lsdc_device *ldev = to_lsdc(plane->dev);
+	struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state, plane);
+	struct drm_crtc *crtc = new_plane_state->crtc;
+	struct drm_framebuffer *fb = new_plane_state->fb;
+	u32 fb_offset = lsdc_get_fb_offset(fb, new_plane_state, 0);
+	dma_addr_t fb_addr;
+
+	if (ldev->use_vram_helper) {
+		s64 gpu_addr;
+
+		gpu_addr = lsdc_get_vram_bo_offset(fb);
+		if (gpu_addr < 0)
+			return;
+
+		fb_addr = ldev->vram_base + gpu_addr + fb_offset;
+	} else {
+		struct drm_gem_cma_object *obj = drm_fb_cma_get_gem_obj(fb, 0);
+
+		fb_addr = obj->paddr + fb_offset;
+	}
+
+	lsdc_update_fb_start_addr(ldev, crtc, fb_addr);
+
+	lsdc_update_stride(ldev, crtc, fb->pitches[0]);
+
+	if (drm_atomic_crtc_needs_modeset(crtc->state))
+		lsdc_update_fb_format(ldev, crtc, fb->format);
+}
+
+static void lsdc_primary_plane_atomic_disable(struct drm_plane *plane,
+					      struct drm_atomic_state *state)
+{
+	drm_dbg(plane->dev, "%s disabled\n", plane->name);
+}
+
+static int lsdc_plane_prepare_fb(struct drm_plane *plane,
+				 struct drm_plane_state *new_state)
+{
+	struct lsdc_device *ldev = to_lsdc(plane->dev);
+
+	if (ldev->use_vram_helper)
+		return drm_gem_vram_plane_helper_prepare_fb(plane, new_state);
+
+	return drm_gem_plane_helper_prepare_fb(plane, new_state);
+}
+
+static void lsdc_plane_cleanup_fb(struct drm_plane *plane,
+				  struct drm_plane_state *old_state)
+{
+	struct drm_device *ddev = plane->dev;
+	struct lsdc_device *ldev = to_lsdc(ddev);
+
+	if (ldev->use_vram_helper)
+		return drm_gem_vram_plane_helper_cleanup_fb(plane, old_state);
+}
+
+static const struct drm_plane_helper_funcs lsdc_primary_plane_helpers = {
+	.prepare_fb = lsdc_plane_prepare_fb,
+	.cleanup_fb = lsdc_plane_cleanup_fb,
+	.atomic_check = lsdc_primary_plane_atomic_check,
+	.atomic_update = lsdc_primary_plane_atomic_update,
+	.atomic_disable = lsdc_primary_plane_atomic_disable,
+};
+
+static int lsdc_cursor_atomic_check(struct drm_plane *plane,
+				    struct drm_atomic_state *state)
+{
+	struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state, plane);
+	struct drm_framebuffer *fb = new_plane_state->fb;
+	struct drm_crtc *crtc = new_plane_state->crtc;
+	struct drm_crtc_state *crtc_state;
+	int ret;
+
+	/* no need for further checks if the plane is being disabled */
+	if (!crtc || !fb)
+		return 0;
+
+	if (!new_plane_state->visible)
+		return 0;
+
+	crtc_state = drm_atomic_get_new_crtc_state(state,
+						   new_plane_state->crtc);
+
+	ret = drm_atomic_helper_check_plane_state(new_plane_state,
+						  crtc_state,
+						  DRM_PLANE_HELPER_NO_SCALING,
+						  DRM_PLANE_HELPER_NO_SCALING,
+						  true,
+						  true);
+	if (ret)
+		return ret;
+
+	if (fb->width < LSDC_CURS_MIN_SIZE ||
+	    fb->height < LSDC_CURS_MIN_SIZE ||
+	    fb->width > LSDC_CURS_MAX_SIZE ||
+	    fb->height > LSDC_CURS_MAX_SIZE) {
+		drm_err(plane->dev, "Invalid cursor size: %dx%d\n",
+			fb->width, fb->height);
+		return -EINVAL;
+	}
+
+	return 0;
+}
+
+static void lsdc_cursor_update_location(struct lsdc_device *ldev,
+					struct drm_crtc *crtc)
+{
+	u32 val;
+
+	val = lsdc_reg_read32(ldev, LSDC_CURSOR_CFG_REG);
+
+	if ((val & CURSOR_FORMAT_MASK) == 0)
+		val |= CURSOR_FORMAT_ARGB8888;
+
+	/* Update the location of the cursor
+	 * if bit 4 of LSDC_CURSOR_CFG_REG is 1, then the cursor will be
+	 * locate at CRTC1, if bit 4 of LSDC_CURSOR_CFG_REG is 0, then
+	 * the cursor will be locate at CRTC0.
+	 */
+	if (drm_crtc_index(crtc))
+		val |= CURSOR_LOCATION_BIT;
+
+	lsdc_reg_write32(ldev, LSDC_CURSOR_CFG_REG, val);
+}
+
+/* update the position of the cursor */
+static void lsdc_cursor_update_position(struct lsdc_device *ldev, int x, int y)
+{
+	if (x < 0)
+		x = 0;
+
+	if (y < 0)
+		y = 0;
+
+	lsdc_reg_write32(ldev, LSDC_CURSOR_POSITION_REG, (y << 16) | x);
+}
+
+static void lsdc_cursor_atomic_update(struct drm_plane *plane,
+				      struct drm_atomic_state *state)
+{
+	struct drm_device *ddev = plane->dev;
+	struct lsdc_device *ldev = to_lsdc(ddev);
+	struct drm_plane_state *new_plane_state = drm_atomic_get_new_plane_state(state, plane);
+	struct drm_plane_state *old_plane_state = drm_atomic_get_old_plane_state(state, plane);
+	struct drm_framebuffer *new_fb = new_plane_state->fb;
+	struct drm_framebuffer *old_fb = old_plane_state->fb;
+
+	if (new_fb != old_fb) {
+		u64 cursor_addr;
+
+		if (ldev->use_vram_helper) {
+			s64 offset;
+
+			offset = lsdc_get_vram_bo_offset(new_fb);
+			cursor_addr = ldev->vram_base + offset;
+
+			drm_dbg_kms(ddev, "%s offset: %llx\n", plane->name, offset);
+		} else {
+			struct drm_gem_cma_object *cursor_obj;
+
+			cursor_obj = drm_fb_cma_get_gem_obj(new_fb, 0);
+			if (!cursor_obj)
+				return;
+
+			cursor_addr = cursor_obj->paddr;
+		}
+
+		lsdc_reg_write32(ldev, LSDC_CURSOR_ADDR_REG, cursor_addr);
+	}
+
+	lsdc_cursor_update_position(ldev, new_plane_state->crtc_x, new_plane_state->crtc_y);
+
+	lsdc_cursor_update_location(ldev, new_plane_state->crtc);
+}
+
+static void lsdc_cursor_atomic_disable(struct drm_plane *plane,
+				       struct drm_atomic_state *state)
+{
+	struct drm_device *ddev = plane->dev;
+	struct lsdc_device *ldev = to_lsdc(ddev);
+	struct drm_plane_state *old_plane_state;
+	struct drm_crtc *crtc;
+
+	old_plane_state = drm_atomic_get_old_plane_state(state, plane);
+
+	if (old_plane_state)
+		crtc = old_plane_state->crtc;
+
+	lsdc_reg_write32(ldev, LSDC_CURSOR_CFG_REG, 0);
+
+	drm_dbg(ddev, "%s disabled\n", plane->name);
+}
+
+static const struct drm_plane_helper_funcs lsdc_cursor_plane_helpers = {
+	.prepare_fb = lsdc_plane_prepare_fb,
+	.cleanup_fb = lsdc_plane_cleanup_fb,
+	.atomic_check = lsdc_cursor_atomic_check,
+	.atomic_update = lsdc_cursor_atomic_update,
+	.atomic_disable = lsdc_cursor_atomic_disable,
+};
+
+static int lsdc_plane_get_default_zpos(enum drm_plane_type type)
+{
+	switch (type) {
+	case DRM_PLANE_TYPE_PRIMARY:
+		return 0;
+	case DRM_PLANE_TYPE_OVERLAY:
+		return 1;
+	case DRM_PLANE_TYPE_CURSOR:
+		return 7;
+	}
+	return 0;
+}
+
+static void lsdc_plane_reset(struct drm_plane *plane)
+{
+	drm_atomic_helper_plane_reset(plane);
+
+	plane->state->zpos = lsdc_plane_get_default_zpos(plane->type);
+
+	drm_dbg(plane->dev, "%s reset\n", plane->name);
+}
+
+static const struct drm_plane_funcs lsdc_plane_funcs = {
+	.update_plane = drm_atomic_helper_update_plane,
+	.disable_plane = drm_atomic_helper_disable_plane,
+	.destroy = drm_plane_cleanup,
+	.reset = lsdc_plane_reset,
+	.atomic_duplicate_state = drm_atomic_helper_plane_duplicate_state,
+	.atomic_destroy_state = drm_atomic_helper_plane_destroy_state,
+};
+
+int lsdc_plane_init(struct lsdc_device *ldev,
+		    struct drm_plane *plane,
+		    enum drm_plane_type type,
+		    unsigned int index)
+{
+	struct drm_device *ddev = &ldev->drm;
+	int zpos = lsdc_plane_get_default_zpos(type);
+	unsigned int format_count;
+	const u32 *formats;
+	const char *name;
+	int ret;
+
+	switch (type) {
+	case DRM_PLANE_TYPE_PRIMARY:
+		formats = lsdc_primary_formats;
+		format_count = ARRAY_SIZE(lsdc_primary_formats);
+		name = "primary-%u";
+		break;
+	case DRM_PLANE_TYPE_CURSOR:
+		formats = lsdc_cursor_formats;
+		format_count = ARRAY_SIZE(lsdc_cursor_formats);
+		name = "cursor-%u";
+		break;
+	case DRM_PLANE_TYPE_OVERLAY:
+		drm_err(ddev, "overlay plane is not supported\n");
+		break;
+	}
+
+	ret = drm_universal_plane_init(ddev, plane, 1 << index,
+				       &lsdc_plane_funcs,
+				       formats, format_count,
+				       lsdc_fb_format_modifiers,
+				       type, name, index);
+	if (ret) {
+		drm_err(ddev, "%s failed: %d\n", __func__, ret);
+		return ret;
+	}
+
+	switch (type) {
+	case DRM_PLANE_TYPE_PRIMARY:
+		drm_plane_helper_add(plane, &lsdc_primary_plane_helpers);
+		drm_plane_create_zpos_property(plane, zpos, 0, 6);
+		break;
+	case DRM_PLANE_TYPE_CURSOR:
+		drm_plane_helper_add(plane, &lsdc_cursor_plane_helpers);
+		drm_plane_create_zpos_immutable_property(plane, zpos);
+		break;
+	case DRM_PLANE_TYPE_OVERLAY:
+		drm_err(ddev, "overlay plane is not supported\n");
+		break;
+	}
+
+	drm_plane_create_alpha_property(plane);
+
+	return 0;
+}
diff --git a/drivers/gpu/drm/lsdc/lsdc_pll.c b/drivers/gpu/drm/lsdc/lsdc_pll.c
new file mode 100644
index 000000000000..87dec9b13485
--- /dev/null
+++ b/drivers/gpu/drm/lsdc/lsdc_pll.c
@@ -0,0 +1,580 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * KMS driver for Loongson display controller
+ *
+ * Copyright (C) 2020-2022, Sui Jingfeng <15330273260@189.cn>
+ *
+ */
+
+/*
+ * Authors:
+ *      Sui Jingfeng <suijingfeng@loongson.cn>
+ */
+
+#include "lsdc_drv.h"
+#include "lsdc_regs.h"
+#include "lsdc_pll.h"
+
+/*
+ * The structure of the pixel PLL register is evolved with times.
+ * All loongson's cpu is little endian.
+ */
+
+/* u64 */
+struct ls7a1000_pixpll_bitmap {
+	/* Byte 0 ~ Byte 3 */
+	unsigned div_out      : 7;   /*  0 : 6     output clock divider  */
+	unsigned reserved_1   : 14;  /*  7 : 20                          */
+	unsigned loopc        : 9;   /* 21 : 29                          */
+	unsigned reserved_2   : 2;   /* 30 : 31                          */
+
+	/* Byte 4 ~ Byte 7 */
+	unsigned div_ref      : 7;   /*  0 : 6     input clock divider   */
+	unsigned locked       : 1;   /*  7         PLL locked flag       */
+	unsigned sel_out      : 1;   /*  8         output clk selector   */
+	unsigned reserved_3   : 2;   /*  9 : 10    reserved              */
+	unsigned set_param    : 1;   /*  11        set pll param         */
+	unsigned bypass       : 1;   /*  12                              */
+	unsigned powerdown    : 1;   /*  13                              */
+	unsigned reserved_4   : 18;  /*  14 : 31                         */
+};
+
+/* u128 */
+struct ls2k1000_pixpll_bitmap {
+	/* Byte 0 ~ Byte 3 */
+	unsigned sel_out      :  1;  /*  0      select this PLL          */
+	unsigned reserved_1   :  1;  /*  1                               */
+	unsigned sw_adj_en    :  1;  /*  2      allow software adjust    */
+	unsigned bypass       :  1;  /*  3      bypass L1 PLL            */
+	unsigned reserved_2   :  3;  /*  4:6                             */
+	unsigned lock_en      :  1;  /*  7      enable lock L1 PLL       */
+	unsigned reserved_3   :  2;  /*  8:9                             */
+	unsigned lock_check   :  2;  /* 10:11   precision check          */
+	unsigned reserved_4   :  4;  /* 12:15                            */
+
+	unsigned locked       :  1;  /* 16      PLL locked flag bit      */
+	unsigned reserved_5   :  2;  /* 17:18                            */
+	unsigned powerdown    :  1;  /* 19      powerdown the pll if set */
+	unsigned reserved_6   :  6;  /* 20:25                            */
+	unsigned div_ref      :  6;  /* 26:31   L1 Prescaler             */
+
+	/* Byte 4 ~ Byte 7 */
+	unsigned loopc        : 10;  /* 32:41   Clock Multiplier         */
+	unsigned l1_div       :  6;  /* 42:47   not used                 */
+	unsigned reserved_7   : 16;  /* 48:63                            */
+
+	/* Byte 8 ~ Byte 15 */
+	unsigned div_out      :  6;  /* 0 : 5   output clock divider     */
+	unsigned reserved_8   : 26;  /* 6 : 31                           */
+	unsigned reserved_9   : 32;  /* 70: 127                          */
+};
+
+/* u32 */
+struct ls2k0500_pixpll_bitmap {
+	/* Byte 0 ~ Byte 1 */
+	unsigned sel_out      : 1;
+	unsigned reserved_1   : 2;
+	unsigned sw_adj_en    : 1;   /* allow software adjust              */
+	unsigned bypass       : 1;   /* bypass L1 PLL                      */
+	unsigned powerdown    : 1;   /* write 1 to powerdown the PLL       */
+	unsigned reserved_2   : 1;
+	unsigned locked       : 1;   /*  7     Is L1 PLL locked, read only */
+	unsigned div_ref      : 6;   /*  8:13  ref clock divider           */
+	unsigned reserved_3   : 2;   /* 14:15                              */
+	/* Byte 2 ~ Byte 3 */
+	unsigned loopc        : 8;   /* 16:23   Clock Multiplier           */
+	unsigned div_out      : 6;   /* 24:29   output clock divider       */
+	unsigned reserved_4   : 2;   /* 30:31                              */
+};
+
+union lsdc_pixpll_bitmap {
+	struct ls7a1000_pixpll_bitmap ls7a1000;
+	struct ls2k1000_pixpll_bitmap ls2k1000;
+	struct ls2k0500_pixpll_bitmap ls2k0500;
+
+	u32 dword[4];
+};
+
+struct pixclk_to_pll_parm {
+	/* kHz */
+	unsigned int clock;
+
+	/* unrelated information */
+	unsigned short width;
+	unsigned short height;
+	unsigned short vrefresh;
+
+	/* Stores parameters for programming the Hardware PLLs */
+	unsigned short div_out;
+	unsigned short loopc;
+	unsigned short div_ref;
+};
+
+/*
+ * Pixel clock to PLL parameters translation table.
+ * Small static cached value to speed up PLL parameters calculation.
+ */
+static const struct pixclk_to_pll_parm pll_param_table[] = {
+	{148500, 1920, 1080, 60, 11, 49,  3},   /* 1920x1080@60Hz */
+						/* 1920x1080@50Hz */
+	{174500, 1920, 1080, 75, 17, 89,  3},   /* 1920x1080@75Hz */
+	{181250, 2560, 1080, 75,  8, 58,  4},   /* 2560x1080@75Hz */
+	{146250, 1680, 1050, 60, 16, 117, 5},   /* 1680x1050@60Hz */
+	{135000, 1280, 1024, 75, 10, 54,  4},   /* 1280x1024@75Hz */
+
+	{108000, 1600, 900,  60, 15, 81,  5},   /* 1600x900@60Hz  */
+						/* 1280x1024@60Hz */
+						/* 1280x960@60Hz */
+						/* 1152x864@75Hz */
+
+	{106500, 1440, 900,  60, 19, 81,  4},   /* 1440x900@60Hz */
+	{88750,  1440, 900,  60, 16, 71,  5},   /* 1440x900@60Hz */
+	{83500,  1280, 800,  60, 17, 71,  5},   /* 1280x800@60Hz */
+	{71000,  1280, 800,  60, 20, 71,  5},   /* 1280x800@60Hz */
+
+	{74250,  1280, 720,  60, 22, 49,  3},   /* 1280x720@60Hz */
+						/* 1280x720@50Hz */
+
+	{78750,  1024, 768,  75, 16, 63,  5},   /* 1024x768@75Hz */
+	{75000,  1024, 768,  70, 29, 87,  4},   /* 1024x768@70Hz */
+	{65000,  1024, 768,  60, 20, 39,  3},   /* 1024x768@60Hz */
+
+	{51200,  1024, 600,  60, 25, 64,  5},   /* 1024x600@60Hz */
+
+	{57284,  832,  624,  75, 24, 55,  4},   /* 832x624@75Hz */
+	{49500,  800,  600,  75, 40, 99,  5},   /* 800x600@75Hz */
+	{50000,  800,  600,  72, 44, 88,  4},   /* 800x600@72Hz */
+	{40000,  800,  600,  60, 30, 36,  3},   /* 800x600@60Hz */
+	{36000,  800,  600,  56, 50, 72,  4},   /* 800x600@56Hz */
+	{31500,  640,  480,  75, 40, 63,  5},   /* 640x480@75Hz */
+						/* 640x480@73Hz */
+
+	{30240,  640,  480,  67, 62, 75,  4},   /* 640x480@67Hz */
+	{27000,  720,  576,  50, 50, 54,  4},   /* 720x576@60Hz */
+	{25175,  640,  480,  60, 85, 107, 5},   /* 640x480@60Hz */
+	{25200,  640,  480,  60, 50, 63,  5},   /* 640x480@60Hz */
+						/* 720x480@60Hz */
+};
+
+/**
+ * lsdc_pixpll_setup - ioremap the device dependent PLL registers
+ *
+ * @this: point to the object which this function is called from
+ */
+static int lsdc_pixpll_setup(struct lsdc_pll * const this)
+{
+	this->mmio = ioremap(this->reg_base, this->reg_size);
+
+	drm_dbg(this->ddev, "PIXPLL%u REG[%x, %u] map to %llx\n",
+		this->index, this->reg_base, this->reg_size, (u64)this->mmio);
+
+	return 0;
+}
+
+/*
+ * Find a set of pll parameters (to generate pixel clock) from a static
+ * local table, which avoid to compute the pll parameter eachtime a
+ * modeset is triggered.
+ *
+ * @this: point to the object which this function is called from
+ * @clock: the desired output pixel clock, the unit is kHz
+ * @pout: point to where the parameters to store if found
+ *
+ *  Return true if hit, otherwise return false.
+ */
+static bool lsdc_pixpll_find(struct lsdc_pll * const this,
+			     unsigned int clock,
+			     struct lsdc_pll_core_values * const pout)
+{
+	unsigned int num = ARRAY_SIZE(pll_param_table);
+	unsigned int i;
+
+	for (i = 0; i < num; i++) {
+		if (clock != pll_param_table[i].clock)
+			continue;
+
+		pout->div_ref = pll_param_table[i].div_ref;
+		pout->loopc   = pll_param_table[i].loopc;
+		pout->div_out = pll_param_table[i].div_out;
+
+		return true;
+	}
+
+	drm_dbg(this->ddev, "pixel clock %u: miss\n", clock);
+
+	return false;
+}
+
+/*
+ * Find a set of pll parameters which have minimal difference with
+ * the desired pixel clock frequency. It does that by computing all
+ * of the possible combination. Compute the diff and find the minimal.
+ *
+ *  clock_out = refclk / div_ref * loopc / div_out
+ *
+ *  refclk is fixed as 100MHz in ls7a1000, ls2k1000 and ls2k0500
+ *
+ * @this: point to the object which this function is called from
+ * @clk: the desired output pixel clock, the unit is kHz
+ * @pout: point to where the parameters to store if success
+ *
+ *  Return true if a parameter is found, otherwise return false
+ */
+static bool lsdc_pixpll_compute(struct lsdc_pll * const this,
+				unsigned int clk,
+				struct lsdc_pll_core_values *pout)
+{
+	unsigned int refclk = this->ref_clock;
+	const unsigned int tolerance = 1000;
+	unsigned int min = tolerance;
+	unsigned int div_out, loopc, div_ref;
+
+	if (lsdc_pixpll_find(this, clk, pout))
+		return true;
+
+	for (div_out = 6; div_out < 64; div_out++) {
+		for (div_ref = 3; div_ref < 6; div_ref++) {
+			for (loopc = 6; loopc < 161; loopc++) {
+				int diff;
+
+				if (loopc < 12 * div_ref)
+					continue;
+				if (loopc > 32 * div_ref)
+					continue;
+
+				diff = clk * div_out - refclk * loopc / div_ref;
+
+				if (diff < 0)
+					diff = -diff;
+
+				if (diff < min) {
+					min = diff;
+					pout->div_ref = div_ref;
+					pout->div_out = div_out;
+					pout->loopc = loopc;
+
+					if (diff == 0)
+						return true;
+				}
+			}
+		}
+	}
+
+	return min < tolerance;
+}
+
+/*
+ * Update the pll parameters to hardware, target to the pixpll in ls7a1000
+ *
+ * @this: point to the object which this function is called from
+ * @param: point to the core parameters passed in
+ *
+ * return 0 if successful.
+ */
+static int ls7a1000_pixpll_param_update(struct lsdc_pll * const this,
+					struct lsdc_pll_core_values const *param)
+{
+	void __iomem *reg = this->mmio;
+	unsigned int counter = 0;
+	bool locked;
+	u32 val;
+
+	/* Bypass the software configured PLL, using refclk directly */
+	val = readl(reg + 0x4);
+	val &= ~(1 << 8);
+	writel(val, reg + 0x4);
+
+	/* Powerdown the PLL */
+	val = readl(reg + 0x4);
+	val |= (1 << 13);
+	writel(val, reg + 0x4);
+
+	/* Clear the pll parameters */
+	val = readl(reg + 0x4);
+	val &= ~(1 << 11);
+	writel(val, reg + 0x4);
+
+	/* clear old value & config new value */
+	val = readl(reg + 0x04);
+	val &= ~0x7F;
+	val |= param->div_ref;        /* div_ref */
+	writel(val, reg + 0x4);
+
+	val = readl(reg);
+	val &= ~0x7f;
+	val |= param->div_out;        /* div_out */
+
+	val &= ~(0x1ff << 21);
+	val |= param->loopc << 21;    /* loopc */
+	writel(val, reg);
+
+	/* Set the pll the parameters */
+	val = readl(reg + 0x4);
+	val |= (1 << 11);
+	writel(val, reg + 0x4);
+
+	/* Powerup the PLL */
+	val = readl(reg + 0x4);
+	val &= ~(1 << 13);
+	writel(val, reg + 0x4);
+
+	/* Wait the PLL lock */
+	do {
+		val = readl(reg + 0x4);
+		locked = val & 0x80;
+		counter++;
+	} while (!locked && (counter < 10000));
+
+	drm_dbg(this->ddev, "%u loop waited\n", counter);
+
+	/* Switch to the software configured pll */
+	val = readl(reg + 0x4);
+	val |= (1UL << 8);
+	writel(val, reg + 0x4);
+
+	return 0;
+}
+
+/*
+ * Update the pll parameters to hardware, target to the pixpll in ls2k1000
+ *
+ * @this: point to the object which calling this function
+ * @param: pointer to where the parameters passed in
+ *
+ * return 0 if successful.
+ */
+static int ls2k1000_pixpll_param_update(struct lsdc_pll * const this,
+					struct lsdc_pll_core_values const *param)
+{
+	void __iomem *reg = this->mmio;
+	unsigned int counter = 0;
+	bool locked = false;
+	u32 val;
+
+	val = readl(reg);
+	/* Bypass the software configured PLL, using refclk directly */
+	val &= ~(1 << 0);
+	writel(val, reg);
+
+	/* Powerdown the PLL */
+	val |= (1 << 19);
+	writel(val, reg);
+
+	/* Allow the software configuration */
+	val &= ~(1 << 2);
+	writel(val, reg);
+
+	/* allow L1 PLL lock */
+	val = (1L << 7) | (3L << 10);
+	writel(val, reg);
+
+	/* clear div_ref bit field */
+	val &= ~(0x3f << 26);
+	/* set div_ref bit field */
+	val = val | (param->div_ref << 26);
+	writel(val, reg);
+
+	val = readl(reg + 4);
+	/* clear loopc bit field */
+	val &= ~0x0fff;
+	/* set loopc bit field */
+	val |= param->loopc;
+	writel(val, reg + 4);
+
+	/* set div_out */
+	writel(param->div_out, reg + 8);
+
+	val = readl(reg);
+	/* use the software configure param */
+	val |= (1 << 2);
+	/* powerup the PLL */
+	val &= ~(1 << 19);
+	writel(val, reg);
+
+	/* wait pll setup and locked */
+	do {
+		val = readl(reg);
+		locked = val & 0x10000;
+		counter++;
+	} while (!locked && (counter < 10000));
+
+	drm_dbg(this->ddev, "%u loop waited\n", counter);
+
+	/* Switch to the above software configured PLL instead of refclk */
+	val |= 1;
+	writel(val, reg);
+
+	return 0;
+}
+
+/*
+ * Update the pll parameters to hardware, target to the pixpll in ls2k0500
+ *
+ * @this: point to the object which calling this function
+ * @param: pointer to where the parameters passed in
+ *
+ * return 0 if successful.
+ */
+static int ls2k0500_pixpll_param_update(struct lsdc_pll * const this,
+					struct lsdc_pll_core_values const *param)
+{
+	void __iomem *reg = this->mmio;
+	unsigned int counter = 0;
+	bool locked = false;
+	u32 val;
+
+	/* Bypass the software configured PLL, using refclk directly */
+	val = readl(reg);
+	val &= ~(1 << 0);
+	writel(val, reg);
+
+	/* Powerdown the PLL */
+	val = readl(reg);
+	val |= (1 << 5);
+	writel(val, reg);
+
+	/* Allow the software configuration */
+	val |= (1 << 3);
+	writel(val, reg);
+
+	/* Update the pll params */
+	val = (param->div_out << 24) |
+	      (param->loopc << 16) |
+	      (param->div_ref << 8);
+
+	writel(val, reg);
+
+	/* Powerup the PLL */
+	val = readl(reg);
+	val &= ~(1 << 5);
+	writel(val, reg);
+
+	/* wait pll setup and locked */
+	do {
+		val = readl(reg);
+		locked = val & 0x80;
+		counter++;
+	} while (!locked && (counter < 10000));
+
+	drm_dbg(this->ddev, "%u loop waited\n", counter);
+
+	/* Switch to the above software configured PLL instead of refclk */
+	writel((val | 1), reg);
+
+	return 0;
+}
+
+static unsigned int lsdc_get_clock_rate(struct lsdc_pll * const this,
+					struct lsdc_pll_core_values *pout)
+{
+	struct drm_device *ddev = this->ddev;
+	struct lsdc_device *ldev = to_lsdc(ddev);
+	const struct lsdc_chip_desc * const desc = ldev->desc;
+	unsigned int out;
+	union lsdc_pixpll_bitmap parms;
+
+	if (desc->chip == LSDC_CHIP_7A1000) {
+		struct ls7a1000_pixpll_bitmap *obj = &parms.ls7a1000;
+
+		parms.dword[0] = readl(this->mmio);
+		parms.dword[1] = readl(this->mmio + 4);
+		out = this->ref_clock / obj->div_ref * obj->loopc / obj->div_out;
+		if (pout) {
+			pout->div_ref = obj->div_ref;
+			pout->loopc = obj->loopc;
+			pout->div_out = obj->div_out;
+		}
+	} else if (desc->chip == LSDC_CHIP_2K1000) {
+		struct ls2k1000_pixpll_bitmap *obj = &parms.ls2k1000;
+
+		parms.dword[0] = readl(this->mmio);
+		parms.dword[1] = readl(this->mmio + 4);
+		parms.dword[2] = readl(this->mmio + 8);
+		parms.dword[3] = readl(this->mmio + 12);
+		out = this->ref_clock / obj->div_ref * obj->loopc / obj->div_out;
+		if (pout) {
+			pout->div_ref = obj->div_ref;
+			pout->loopc = obj->loopc;
+			pout->div_out = obj->div_out;
+		}
+	} else if (desc->chip == LSDC_CHIP_2K0500) {
+		struct ls2k0500_pixpll_bitmap *obj = &parms.ls2k0500;
+
+		parms.dword[0] = readl(this->mmio);
+		out = this->ref_clock / obj->div_ref * obj->loopc / obj->div_out;
+		if (pout) {
+			pout->div_ref = obj->div_ref;
+			pout->loopc = obj->loopc;
+			pout->div_out = obj->div_out;
+		}
+	} else {
+		drm_err(ddev, "unknown chip, the driver need update\n");
+		return 0;
+	}
+
+	return out;
+}
+
+static const struct lsdc_pixpll_funcs ls7a1000_pixpll_funcs = {
+	.setup = lsdc_pixpll_setup,
+	.compute = lsdc_pixpll_compute,
+	.update = ls7a1000_pixpll_param_update,
+	.get_clock_rate = lsdc_get_clock_rate,
+};
+
+static const struct lsdc_pixpll_funcs ls2k1000_pixpll_funcs = {
+	.setup = lsdc_pixpll_setup,
+	.compute = lsdc_pixpll_compute,
+	.update = ls2k1000_pixpll_param_update,
+	.get_clock_rate = lsdc_get_clock_rate,
+};
+
+static const struct lsdc_pixpll_funcs ls2k0500_pixpll_funcs = {
+	.setup = lsdc_pixpll_setup,
+	.compute = lsdc_pixpll_compute,
+	.update = ls2k0500_pixpll_param_update,
+	.get_clock_rate = lsdc_get_clock_rate,
+};
+
+int lsdc_pixpll_init(struct lsdc_pll * const this,
+		     struct drm_device *ddev,
+		     unsigned int index)
+{
+	struct lsdc_device *ldev = to_lsdc(ddev);
+	const struct lsdc_chip_desc *ip = ldev->desc;
+
+	this->ddev = ddev;
+	this->index = index;
+	this->ref_clock = LSDC_PLL_REF_CLK;
+
+	if (ip->chip == LSDC_CHIP_7A1000) {
+		if (index == 0)
+			this->reg_base = LS7A1000_CFG_REG_BASE + LS7A1000_PIX_PLL0_REG;
+		else if (index == 1)
+			this->reg_base = LS7A1000_CFG_REG_BASE + LS7A1000_PIX_PLL1_REG;
+		this->reg_size = 8;
+		this->funcs = &ls7a1000_pixpll_funcs;
+	} else if (ip->chip == LSDC_CHIP_2K1000) {
+		if (index == 0)
+			this->reg_base = LS2K1000_CFG_REG_BASE + LS2K1000_PIX_PLL0_REG;
+		else if (index == 1)
+			this->reg_base = LS2K1000_CFG_REG_BASE + LS2K1000_PIX_PLL1_REG;
+
+		this->reg_size = 16;
+		this->funcs = &ls2k1000_pixpll_funcs;
+	} else if (ip->chip == LSDC_CHIP_2K0500) {
+		if (index == 0)
+			this->reg_base = LS2K0500_CFG_REG_BASE + LS2K0500_PIX_PLL0_REG;
+		else if (index == 1)
+			this->reg_base = LS2K0500_CFG_REG_BASE + LS2K0500_PIX_PLL1_REG;
+
+		this->reg_size = 4;
+		this->funcs = &ls2k0500_pixpll_funcs;
+	} else {
+		drm_err(this->ddev, "unknown chip, the driver need update\n");
+		return -ENOENT;
+	}
+
+	/* call funcs->init only once */
+	return this->funcs->setup(this);
+}
diff --git a/drivers/gpu/drm/lsdc/lsdc_pll.h b/drivers/gpu/drm/lsdc/lsdc_pll.h
new file mode 100644
index 000000000000..5d629827112b
--- /dev/null
+++ b/drivers/gpu/drm/lsdc/lsdc_pll.h
@@ -0,0 +1,90 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * KMS driver for Loongson display controller
+ *
+ * Copyright (C) 2020, Sui Jingfeng <15330273260@189.cn>
+ *
+ */
+
+/*
+ * Authors:
+ *      Sui Jingfeng <suijingfeng@loongson.cn>
+ */
+
+#ifndef __LSDC_PLL_H__
+#define __LSDC_PLL_H__
+
+#include <drm/drm_device.h>
+
+/*
+ * PIXEL PLL hardware structure
+ *
+ * refclk: reference frequency, 100 MHz from external oscillator
+ * outclk: output frequency desired.
+ *
+ *
+ *               L1       Fref                      Fvco     L2
+ * refclk   +-----------+      +------------------+      +---------+   outclk
+ * ---+---> | Prescaler | ---> | Clock Multiplier | ---> | divider | -------->
+ *    |     +-----------+      +------------------+      +---------+     ^
+ *    |           ^                      ^                    ^          |
+ *    |           |                      |                    |          |
+ *    |           |                      |                    |          |
+ *    |        div_ref                 loopc               div_out       |
+ *    |                                                                  |
+ *    +---- sel_out (bypass above software configurable clock if==1) ----+
+ *
+ *  sel_out: PLL clock output selector.
+ *
+ *  If sel_out == 1, it will take refclk as output directly,
+ *  the L1 Prescaler and the out divider is bypassed.
+ *
+ *  If sel_out == 0, then:
+ *  outclk = refclk / div_ref * loopc / div_out;
+ *
+ * PLL hardware working requirements:
+ *
+ *  1) 20 MHz <= refclk / div_ref <= 40Mhz
+ *  2) 1.2 GHz <= refclk /div_out * loopc <= 3.2 Ghz
+ *
+ */
+
+struct lsdc_pll_core_values {
+	unsigned int div_ref;
+	unsigned int loopc;
+	unsigned int div_out;
+};
+
+struct lsdc_pll;
+
+struct lsdc_pixpll_funcs {
+	int (*setup)(struct lsdc_pll * const this);
+	bool (*compute)(struct lsdc_pll * const this, unsigned int clock,
+			struct lsdc_pll_core_values *params_out);
+	int (*update)(struct lsdc_pll * const this,
+		      struct lsdc_pll_core_values const *params_in);
+	unsigned int (*get_clock_rate)(struct lsdc_pll * const this,
+				       struct lsdc_pll_core_values *pout);
+};
+
+struct lsdc_pll {
+	const struct lsdc_pixpll_funcs *funcs;
+	struct drm_device *ddev;
+	void __iomem *mmio;
+
+	/* PLL register offset */
+	u32 reg_base;
+	/* PLL register size in bytes */
+	u32 reg_size;
+
+	/* 100000kHz, fixed on all board found */
+	unsigned int ref_clock;
+
+	unsigned short index;
+};
+
+int lsdc_pixpll_init(struct lsdc_pll * const this,
+		     struct drm_device *ddev,
+		     unsigned int index);
+
+#endif
diff --git a/drivers/gpu/drm/lsdc/lsdc_regs.h b/drivers/gpu/drm/lsdc/lsdc_regs.h
new file mode 100644
index 000000000000..7407ca974f98
--- /dev/null
+++ b/drivers/gpu/drm/lsdc/lsdc_regs.h
@@ -0,0 +1,202 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * KMS driver for Loongson display controller
+ *
+ * Copyright (C) 2020, Sui Jingfeng <15330273260@189.cn>
+ *
+ */
+
+/*
+ * Authors:
+ *      Sui Jingfeng <suijingfeng@loongson.cn>
+ */
+
+#ifndef __LSDC_REGS_H__
+#define __LSDC_REGS_H__
+
+#include <linux/bitops.h>
+#include <linux/types.h>
+
+/*
+ * PLL
+ */
+#define LSDC_PLL_REF_CLK                100000           /* kHz */
+
+/*
+ * Those PLL registers are not located at DC reg bar space,
+ * there are relative to LSXXXXX_CFG_REG_BASE.
+ * XXXXX = 7A1000, 2K1000, 2K0500
+ */
+
+/* LS2K1000 */
+#define LS2K1000_PIX_PLL0_REG           0x04B0
+#define LS2K1000_PIX_PLL1_REG           0x04C0
+#define LS2K1000_CFG_REG_BASE           0x1fe10000
+
+/* LS7A1000 */
+#define LS7A1000_PIX_PLL0_REG           0x04B0
+#define LS7A1000_PIX_PLL1_REG           0x04C0
+#define LS7A1000_CFG_REG_BASE           0x10010000
+
+/* LS2K0500 */
+#define LS2K0500_PIX_PLL0_REG           0x0418
+#define LS2K0500_PIX_PLL1_REG           0x0420
+#define LS2K0500_CFG_REG_BASE           0x1fe10000
+
+/*
+ *  CRTC CFG REG
+ */
+#define CFG_PIX_FMT_MASK                GENMASK(2, 0)
+
+#define CFG_PAGE_FLIP_BIT               BIT(7)     /* triger pageflip */
+#define CFG_OUTPUT_EN_BIT               BIT(8)
+#define CFG_PANEL_SWITCH                BIT(9)     /* Indicate witch fb addr reg is in using */
+#define CFG_FB_IDX_BIT                  BIT(11)
+#define CFG_GAMMAR_EN_BIT               BIT(12)
+
+/* CRTC get soft reset if voltage level change from 1 -> 0 */
+#define CFG_RESET_BIT                   BIT(20)
+
+#define EN_HSYNC_BIT                    BIT(30)
+#define INV_HSYNC_BIT                   BIT(31)
+#define EN_VSYNC_BIT                    BIT(30)
+#define INV_VSYNC_BIT                   BIT(31)
+
+/******** CRTC0 & DVO0 ********/
+#define LSDC_CRTC0_CFG_REG              0x1240
+#define LSDC_CRTC0_FB_ADDR0_REG         0x1260
+#define LSDC_CRTC0_FB_ADDR1_REG         0x1580
+#define LSDC_CRTC0_STRIDE_REG           0x1280
+#define LSDC_CRTC0_FB_ORIGIN_REG        0x1300
+#define LSDC_CRTC0_HDISPLAY_REG         0x1400
+#define LSDC_CRTC0_HSYNC_REG            0x1420
+#define LSDC_CRTC0_VDISPLAY_REG         0x1480
+#define LSDC_CRTC0_VSYNC_REG            0x14a0
+
+/******** CTRC1 & DVO1 ********/
+#define LSDC_CRTC1_CFG_REG              0x1250
+#define LSDC_CRTC1_FB_ADDR0_REG         0x1270
+#define LSDC_CRTC1_FB_ADDR1_REG         0x1590
+#define LSDC_CRTC1_STRIDE_REG           0x1290
+#define LSDC_CRTC1_FB_ORIGIN_REG        0x1310
+#define LSDC_CRTC1_HDISPLAY_REG         0x1410
+#define LSDC_CRTC1_HSYNC_REG            0x1430
+#define LSDC_CRTC1_VDISPLAY_REG         0x1490
+#define LSDC_CRTC1_VSYNC_REG            0x14b0
+
+/*
+ * Hardware cursor
+ * There is only one hardware cursor shared by two CRTC in ls7a1000,
+ * ls2k1000 and ls2k0500, but ls7a2000 have two Hardware cursor.
+ */
+#define LSDC_CURSOR_CFG_REG             0x1520
+
+#define CURSOR_FORMAT_MASK              GENMASK(1, 0)
+#define CURSOR_FORMAT_DISABLE           0
+#define CURSOR_FORMAT_MONOCHROME        BIT(0)
+#define CURSOR_FORMAT_ARGB8888          BIT(1)
+#define CURSOR_LOCATION_BIT             BIT(4)
+
+#define LSDC_CURSOR_ADDR_REG            0x1530
+#define LSDC_CURSOR_POSITION_REG        0x1540
+#define LSDC_CURSOR_BG_COLOR_REG        0x1550  /* background color */
+#define LSDC_CURSOR_FG_COLOR_REG        0x1560  /* foreground color */
+
+#define CUR_WIDTH_SIZE                  32
+#define CUR_HEIGHT_SIZE                 32
+
+#define LSDC_CURS_MIN_SIZE              1
+#define LSDC_CURS_MAX_SIZE              64
+
+/*
+ * DC Interrupt Control Register, 32bit, Address Offset: 1570
+ *
+ * Bits  0:10 inidicate the interrupt type, read only
+ * Bits 16:26 control if the specific interrupt corresponding to bit 0~10
+ * is enabled or not. Write 1 to enable, write 0 to disable
+ *
+ * RF: Read Finished
+ * IDBU : Internal Data Buffer Underflow
+ * IDBFU : Internal Data Buffer Fatal Underflow
+ *
+ *
+ * +-------+-------------------------------+-------+--------+--------+-------+
+ * | 31:27 |            26:16              | 15:11 |   10   |   9    |   8   |
+ * +-------+-------------------------------+-------+--------+--------+-------+
+ * |  N/A  | Interrupt Enable Control Bits |  N/A  | IDBFU0 | IDBFU1 | IDBU0 |
+ * +-------+-------------------------------+-------+--------+--------+-------+
+ *
+ * Bit 4 is cursor buffer read finished, no use.
+ *
+ * +-------+-----+-----+-----+--------+--------+--------+--------+
+ * |   7   |  6  |  5  |  4  |   3    |   2    |   1    |   0    |
+ * +-------+-----+-----+-----+--------+--------+--------+--------+
+ * | IDBU1 | RF0 | RF1 |     | HSYNC0 | VSYNC0 | HSYNC1 | VSYNC1 |
+ * +-------+-----+-----+-----+--------+--------+--------+--------+
+ *
+ */
+
+#define LSDC_INT_REG                           0x1570
+
+#define INT_CRTC0_VS                           BIT(2)
+#define INT_CRTC0_HS                           BIT(3)
+#define INT_CRTC0_RF                           BIT(6)
+#define INT_CRTC0_IDBU                         BIT(8)
+#define INT_CRTC0_IDBFU                        BIT(10)
+
+#define INT_CURSOR_RF                          BIT(4)
+
+#define INT_CRTC1_VS                           BIT(0)
+#define INT_CRTC1_HS                           BIT(1)
+#define INT_CRTC1_RF                           BIT(5)
+#define INT_CRTC1_IDBU                         BIT(7)
+#define INT_CRTC1_IDBFU                        BIT(9)
+
+#define INT_CRTC0_VS_EN                        BIT(18)
+#define INT_CRTC0_HS_EN                        BIT(19)
+#define INT_CRTC0_RF_EN                        BIT(22)
+#define INT_CRTC0_IDBU_EN                      BIT(24)
+#define INT_CRTC0_IDBFU_EN                     BIT(26)
+
+#define INT_CURSOR_RF_EN                       BIT(20)
+
+#define INT_CRTC1_VS_EN                        BIT(16)
+#define INT_CRTC1_HS_EN                        BIT(17)
+#define INT_CRTC1_RF_EN                        BIT(21)
+#define INT_CRTC1_IDBU_EN                      BIT(23)
+#define INT_CRTC1_IDBFU_EN                     BIT(25)
+
+#define INT_STATUS_MASK                        GENMASK(10, 0)
+
+/*
+ * LS7A1000 have 4 gpio which is under control of the LS7A_DC_GPIO_DAT_REG
+ * and LS7A_DC_GPIO_DIR_REG register, it has no relationship whth the general
+ * GPIO hardware as those two registers are in the DC register space on
+ * LS7A1000.
+ *
+ * This driver using those GPIO to emulated I2C, for reading edid and
+ * monitor detection
+ *
+ * LS2k1000 and LS2K0500 don't have those registers, they use hardware i2c or
+ * generial GPIO emulated i2c from other module.
+ *
+ * GPIO data register
+ *  Address offset: 0x1650
+ *   +---------------+-----------+-----------+
+ *   | 7 | 6 | 5 | 4 |  3  |  2  |  1  |  0  |
+ *   +---------------+-----------+-----------+
+ *   |               |    DVO1   |    DVO0   |
+ *   +      N/A      +-----------+-----------+
+ *   |               | SCL | SDA | SCL | SDA |
+ *   +---------------+-----------+-----------+
+ */
+#define LS7A_DC_GPIO_DAT_REG                   0x1650
+
+/*
+ *  GPIO Input/Output direction control register
+ *  Address offset: 0x1660
+ *  write 1 for Input, 0 for Output.
+ */
+#define LS7A_DC_GPIO_DIR_REG                   0x1660
+
+#endif

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 Roland Scheidegger <sroland@vmware.com>, Zack Rusin <zackr@vmware.com>,
 Christian Gmeiner <christian.gmeiner@gmail.com>,
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 Lucas Stach <l.stach@pengutronix.de>,
 Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
 Ilia Mirkin <imirkin@alum.mit.edu>, Qing Zhang <zhangqing@loongson.cn>,
 Li Yi <liyi@loongson.cn>, suijingfeng <suijingfeng@loongson.cn>
Subject: [PATCH v8 2/3] MIPS: Loongson64: dts: update the display controller
 device node
Date: Thu, 17 Feb 2022 02:17:11 +0800
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From: suijingfeng <suijingfeng@loongson.cn>

The display controller is a pci device, its PCI vendor id is 0x0014
its PCI device id is 0x7a06.

1) In order to let the lsdc kms driver to know which chip the DC is
   contained in, we add different compatible for different chip.

2) Add display controller device node for ls2k1000 SoC

Signed-off-by: suijingfeng <suijingfeng@loongson.cn>
Signed-off-by: Sui Jingfeng <15330273260@189.cn>
---
 .../loongson/loongson,display-controller.yaml | 114 ++++++++++++++++++
 .../display/loongson/loongson-drm.txt         |  16 +++
 .../boot/dts/loongson/loongson64-2k1000.dtsi  |   8 ++
 arch/mips/boot/dts/loongson/ls7a-pch.dtsi     |   7 +-
 4 files changed, 140 insertions(+), 5 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/display/loongson/loongson,display-controller.yaml
 create mode 100644 Documentation/devicetree/bindings/display/loongson/loongson-drm.txt

diff --git a/Documentation/devicetree/bindings/display/loongson/loongson,display-controller.yaml b/Documentation/devicetree/bindings/display/loongson/loongson,display-controller.yaml
new file mode 100644
index 000000000000..64d8364b50ab
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/loongson/loongson,display-controller.yaml
@@ -0,0 +1,114 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/pci0014,7a06.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Loongson LS7A2000/LS7A1000/LS2K1000/LS2K0500 Display Controller Device Tree Bindings
+
+maintainers:
+  - Sui Jingfeng <suijingfeng@loongson.cn>
+
+description: |+
+
+  Loongson display controllers are simple which require scanout buffers
+  to be physically contiguous. LS2K1000/LS2K0500 is a SOC, only system
+  memory is available. LS7A1000/LS7A2000 is bridge chip which is equipped
+  with a dedicated video ram which is 64MB or more.
+
+  For LS7A1000, there are 4 dedicated GPIOs whose control register is
+  located at the DC register space. They are used to emulate two way i2c,
+  One for DVO0, another for DVO1.
+
+  LS2K1000 and LS2K0500 SoC grab i2c adapter from other module, either
+  general purpose GPIO emulated i2c or hardware i2c in the SoC.
+
+  LSDC has two display pipes, each way has a DVO interface which provide
+  RGB888 signals, vertical & horizontal synchronisations, data enable and
+  the pixel clock. LSDC has two CRTC, each CRTC is able to scanout from
+  1920x1080 resolution at 60Hz. Each CRTC has two FB address registers.
+
+  LSDC's display pipeline have several components as below description,
+
+  The display controller in LS7A1000:
+    ___________________                                     _________
+    |            -------|                                   |         |
+    |  CRTC0 --> | DVO0 ----> Encoder0 ---> Connector0 ---> | Monotor |
+    |  _   _     -------|        ^             ^            |_________|
+    | | | | |    -------|        |             |
+    | |_| |_|    | i2c0 <--------+-------------+
+    |            -------|
+    |   DC IN LS7A1000  |
+    |  _   _     -------|
+    | | | | |    | i2c1 <--------+-------------+
+    | |_| |_|    -------|        |             |             _________
+    |            -------|        |             |            |         |
+    |  CRTC1 --> | DVO1 ----> Encoder1 ---> Connector1 ---> |  Panel  |
+    |            -------|                                   |_________|
+    |___________________|
+
+  Simple usage of LS7A1000 with LS3A4000 CPU:
+
+    +------+            +-----------------------------------+
+    | DDR4 |            |  +-------------------+            |
+    +------+            |  | PCIe Root complex |   LS7A1000 |
+       || MC0           |  +--++---------++----+            |
+  +----------+  HT 3.0  |     ||         ||                 |
+  | LS3A4000 |<-------->| +---++---+  +--++--+    +---------+   +------+
+  |   CPU    |<-------->| | GC1000 |  | LSDC |<-->| DDR3 MC |<->| VRAM |
+  +----------+          | +--------+  +-+--+-+    +---------+   +------+
+       || MC1           +---------------|--|----------------+
+    +------+                            |  |
+    | DDR4 |          +-------+   DVO0  |  |  DVO1   +------+
+    +------+   VGA <--|ADV7125|<--------+  +-------->|TFP410|--> DVI/HDMI
+                      +-------+                      +------+
+
+  The display controller in LS2K1000/LS2K0500:
+     ___________________                                     _________
+    |            -------|                                   |         |
+    |  CRTC0 --> | DVO0 ----> Encoder0 ---> Connector0 ---> | Monotor |
+    |  _   _     -------|        ^              ^           |_________|
+    | | | | |           |        |              |
+    | |_| |_|           |     +------+          |
+    |                   <---->| i2c0 |<---------+
+    |   DC IN LS2K1000  |     +------+
+    |  _   _            |     +------+
+    | | | | |           <---->| i2c1 |----------+
+    | |_| |_|           |     +------+          |            _________
+    |            -------|        |              |           |         |
+    |  CRTC1 --> | DVO1 ----> Encoder1 ---> Connector1 ---> |  Panel  |
+    |            -------|                                   |_________|
+    |___________________|
+
+properties:
+  compatible:
+    enum:
+      - loongson,ls7a2000-dc
+      - loongson,ls7a1000-dc
+      - loongson,ls2k1000-dc
+      - loongson,ls2k0500-dc
+
+  reg:
+    maxItems: 1
+
+  interrupts:
+    minItems: 1
+
+required:
+  - compatible
+  - reg
+  - interrupts
+
+additionalProperties: false
+
+examples:
+  - |
+    lsdc: dc@6,1 {
+        compatible = "loongson,ls7a1000-dc";
+        reg = <0x3100 0x0 0x0 0x0 0x0>;
+        interrupts = <28 IRQ_TYPE_LEVEL_HIGH>;
+        interrupt-parent = <&pic>;
+    };
+
+...
+
diff --git a/Documentation/devicetree/bindings/display/loongson/loongson-drm.txt b/Documentation/devicetree/bindings/display/loongson/loongson-drm.txt
new file mode 100644
index 000000000000..46417e0e34ba
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/loongson/loongson-drm.txt
@@ -0,0 +1,16 @@
+Loongson display controller
+===========================
+
+Required properties:
+- compatible: Should be "loongson,display-subsystem" or "loongson,ls-fb"
+- reg: should be register base and length
+- interrupts: Should contain the cores interrupt line
+
+example:
+
+lsdc: dc@0x400c0000 {
+	compatible = "loongson,display-subsystem", "loongson,ls-fb";
+	reg = <0x400c0000 0x00010000>;
+	interrupt-parent = <&icu>;
+	interrupts = <36>;
+};
diff --git a/arch/mips/boot/dts/loongson/loongson64-2k1000.dtsi b/arch/mips/boot/dts/loongson/loongson64-2k1000.dtsi
index 768cf2abcea3..47f6ff4c3e8a 100644
--- a/arch/mips/boot/dts/loongson/loongson64-2k1000.dtsi
+++ b/arch/mips/boot/dts/loongson/loongson64-2k1000.dtsi
@@ -209,6 +209,14 @@ gpu@5,0 {
 				interrupt-parent = <&liointc0>;
 			};
 
+			lsdc: dc@6,0 {
+				compatible = "loongson,ls2k1000-dc";
+
+				reg = <0x3000 0x0 0x0 0x0 0x0>;
+				interrupts = <28 IRQ_TYPE_LEVEL_LOW>;
+				interrupt-parent = <&liointc0>;
+			};
+
 			pci_bridge@9,0 {
 				compatible = "pci0014,7a19.0",
 						   "pci0014,7a19",
diff --git a/arch/mips/boot/dts/loongson/ls7a-pch.dtsi b/arch/mips/boot/dts/loongson/ls7a-pch.dtsi
index 2f45fce2cdc4..b34426142453 100644
--- a/arch/mips/boot/dts/loongson/ls7a-pch.dtsi
+++ b/arch/mips/boot/dts/loongson/ls7a-pch.dtsi
@@ -160,11 +160,8 @@ gpu@6,0 {
 				interrupt-parent = <&pic>;
 			};
 
-			dc@6,1 {
-				compatible = "pci0014,7a06.0",
-						   "pci0014,7a06",
-						   "pciclass030000",
-						   "pciclass0300";
+			lsdc: dc@6,1 {
+				compatible = "loongson,ls7a1000-dc";
 
 				reg = <0x3100 0x0 0x0 0x0 0x0>;
 				interrupts = <28 IRQ_TYPE_LEVEL_HIGH>;

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From: Sui Jingfeng <15330273260@189.cn>
To: Maxime Ripard <mripard@kernel.org>,
 Thomas Zimmermann <tzimmermann@suse.de>,
 Roland Scheidegger <sroland@vmware.com>, Zack Rusin <zackr@vmware.com>,
 Christian Gmeiner <christian.gmeiner@gmail.com>,
 David Airlie <airlied@linux.ie>, Daniel Vetter <daniel@ffwll.ch>,
 Rob Herring <robh+dt@kernel.org>,
 Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
 Dan Carpenter <dan.carpenter@oracle.com>,
 Krzysztof Kozlowski <krzk@kernel.org>,
 Andrey Zhizhikin <andrey.zhizhikin@leica-geosystems.com>,
 Sam Ravnborg <sam@ravnborg.org>, "David S . Miller" <davem@davemloft.net>,
 Jiaxun Yang <jiaxun.yang@flygoat.com>,
 Lucas Stach <l.stach@pengutronix.de>,
 Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
 Ilia Mirkin <imirkin@alum.mit.edu>, Qing Zhang <zhangqing@loongson.cn>,
 Li Yi <liyi@loongson.cn>, suijingfeng <suijingfeng@loongson.cn>
Subject: [PATCH v8 3/3] MAINTAINERS: add maintainers for DRM LSDC driver
Date: Thu, 17 Feb 2022 02:17:12 +0800
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From: suijingfeng <suijingfeng@loongson.cn>

Signed-off-by: suijingfeng <suijingfeng@loongson.cn>
Signed-off-by: Sui Jingfeng <15330273260@189.cn>
---
 MAINTAINERS | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/MAINTAINERS b/MAINTAINERS
index ea3e6c914384..3f5e13a6358b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -6453,6 +6453,15 @@ T:	git git://anongit.freedesktop.org/drm/drm-misc
 F:	drivers/gpu/drm/lima/
 F:	include/uapi/drm/lima_drm.h
 
+DRM DRIVERS FOR LOONGSON
+M:	Sui Jingfeng <suijingfeng@loongson.cn>
+L:	dri-devel@lists.freedesktop.org
+S:	Maintained
+W:	https://www.loongson.cn/
+T:	git git://anongit.freedesktop.org/drm/drm-misc
+F:	drivers/gpu/drm/lsdc/
+F:	Documentation/devicetree/bindings/display/loongson/
+
 DRM DRIVERS FOR MEDIATEK
 M:	Chun-Kuang Hu <chunkuang.hu@kernel.org>
 M:	Philipp Zabel <p.zabel@pengutronix.de>