[PATCH 0/5] Add support for PinePhone LCD panel

[PATCH 0/5] Add support for PinePhone LCD panel

[Icenowy Zheng]

This patchset adds support for the LCD panel of PinePhone.

The first 3 patches are for the panel itself, and the last 2 patches are
for enabling it on PinePhone.

PATCH 4 is the fix of a bug in sun6i_mipi_dsi which will gets triggered
on XBD599.

Icenowy Zheng (5):
  dt-bindings: vendor-prefixes: Add Xingbangda
  dt-bindings: panel: add binding for Xingbangda XBD599 panel
  drm: panel: add Xingbangda XBD599 panel
  drm/sun4i: sun6i_mipi_dsi: fix horizontal timing calculation
  arm64: allwinner: dts: a64: add LCD-related device nodes for PinePhone

 .../display/panel/xingbangda,xbd599.yaml      |  50 +++
 .../devicetree/bindings/vendor-prefixes.yaml  |   2 +
 .../dts/allwinner/sun50i-a64-pinephone.dtsi   |  37 ++
 drivers/gpu/drm/panel/Kconfig                 |   9 +
 drivers/gpu/drm/panel/Makefile                |   1 +
 .../gpu/drm/panel/panel-xingbangda-xbd599.c   | 367 ++++++++++++++++++
 drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c        |  10 +-
 7 files changed, 471 insertions(+), 5 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/display/panel/xingbangda,xbd599.yaml
 create mode 100644 drivers/gpu/drm/panel/panel-xingbangda-xbd599.c

-- 
2.24.1

[PATCH 1/5] dt-bindings: vendor-prefixes: Add Xingbangda

[Icenowy Zheng]

Shenzhen Xingbangda Display Technology Co., Ltd is a company which
produces LCD modules. It supplies the LCD panels of the PinePhone series
(the developers' kit and the final phone).

Add the vendor prefix of it.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
---
 Documentation/devicetree/bindings/vendor-prefixes.yaml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/vendor-prefixes.yaml b/Documentation/devicetree/bindings/vendor-prefixes.yaml
index b8e9ef79cab9..038a2180d34b 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.yaml
+++ b/Documentation/devicetree/bindings/vendor-prefixes.yaml
@@ -1102,6 +1102,8 @@ patternProperties:
     description: Xiaomi Technology Co., Ltd.
   "^xillybus,.*":
     description: Xillybus Ltd.
+  "^xingbangda,.*":
+    description: Shenzhen Xingbangda Display Technology Co., Ltd
   "^xinpeng,.*":
     description: Shenzhen Xinpeng Technology Co., Ltd
   "^xlnx,.*":
-- 
2.24.1

[PATCH 2/5] dt-bindings: panel: add binding for Xingbangda XBD599 panel

[Icenowy Zheng]

Xingbangda XBD599 is a 5.99" 720x1440 MIPI-DSI LCD panel.

Add its device tree binding.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
---
 .../display/panel/xingbangda,xbd599.yaml      | 50 +++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/panel/xingbangda,xbd599.yaml

diff --git a/Documentation/devicetree/bindings/display/panel/xingbangda,xbd599.yaml b/Documentation/devicetree/bindings/display/panel/xingbangda,xbd599.yaml
new file mode 100644
index 000000000000..62816b34de31
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/panel/xingbangda,xbd599.yaml
@@ -0,0 +1,50 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/panel/xingbangda,xbd599.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Xingbangda XBD599 5.99in MIPI-DSI LCD panel
+
+maintainers:
+  - Icenowy Zheng <icenowy@aosc.io>
+
+allOf:
+  - $ref: panel-common.yaml#
+
+properties:
+  compatible:
+    const: xingbangda,xbd599
+  reg: true
+  backlight: true
+  reset-gpios: true
+  vcc-supply:
+     description: regulator that supplies the VCC voltage
+  iovcc-supply:
+     description: regulator that supplies the IOVCC voltage
+
+required:
+  - compatible
+  - reg
+  - backlight
+  - vcc-supply
+  - iovcc-supply
+
+additionalProperties: false
+
+examples:
+  - |
+    &dsi {
+        #address-cells = <1>;
+        #size-cells = <0>;
+
+        panel@0 {
+            compatible = "xingbangda,xbd599";
+            reg = <0>;
+            backlight = <&backlight>;
+            iovcc-supply = <&reg_dldo2>;
+            vcc-supply = <&reg_ldo_io0>;
+        };
+    };
+
+...
-- 
2.24.1

[PATCH 3/5] drm: panel: add Xingbangda XBD599 panel

[Icenowy Zheng]

Xingbangda XBD599 is a 5.99" 720x1440 MIPI-DSI IPS LCD panel made by
Xingbangda, which is used on PinePhone final assembled phones.

Add support for it.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
---
 drivers/gpu/drm/panel/Kconfig                 |   9 +
 drivers/gpu/drm/panel/Makefile                |   1 +
 .../gpu/drm/panel/panel-xingbangda-xbd599.c   | 367 ++++++++++++++++++
 3 files changed, 377 insertions(+)
 create mode 100644 drivers/gpu/drm/panel/panel-xingbangda-xbd599.c

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index da3b84602cdd..d648f40469c7 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -413,6 +413,15 @@ config DRM_PANEL_TRULY_NT35597_WQXGA
 	  Say Y here if you want to enable support for Truly NT35597 WQXGA Dual DSI
 	  Video Mode panel
 
+config DRM_PANEL_XINGBANGDA_XBD599
+	tristate "Xingbangda XBD599 panel"
+	depends on OF
+	depends on DRM_MIPI_DSI
+	depends on BACKLIGHT_CLASS_DEVICE
+	help
+	  Say Y here if you want to enable support for the Xingbangda XBD599
+	  MIPI DSI Video Mode panel.
+
 config DRM_PANEL_XINPENG_XPP055C272
 	tristate "Xinpeng XPP055C272 panel driver"
 	depends on OF
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index af1e2a3cc5fc..d9645f079e59 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -44,4 +44,5 @@ obj-$(CONFIG_DRM_PANEL_TPO_TD028TTEC1) += panel-tpo-td028ttec1.o
 obj-$(CONFIG_DRM_PANEL_TPO_TD043MTEA1) += panel-tpo-td043mtea1.o
 obj-$(CONFIG_DRM_PANEL_TPO_TPG110) += panel-tpo-tpg110.o
 obj-$(CONFIG_DRM_PANEL_TRULY_NT35597_WQXGA) += panel-truly-nt35597.o
+obj-$(CONFIG_DRM_PANEL_XINGBANGDA_XBD599) += panel-xingbangda-xbd599.o
 obj-$(CONFIG_DRM_PANEL_XINPENG_XPP055C272) += panel-xinpeng-xpp055c272.o
diff --git a/drivers/gpu/drm/panel/panel-xingbangda-xbd599.c b/drivers/gpu/drm/panel/panel-xingbangda-xbd599.c
new file mode 100644
index 000000000000..68a5d8bb7f26
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-xingbangda-xbd599.c
@@ -0,0 +1,367 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Xingbangda XBD599 MIPI-DSI panel driver
+ *
+ * Copyright (C) 2019 Icenowy Zheng <icenowy@aosc.io>
+ *
+ * Based on panel-rocktech-jh057n00900.c, which is:
+ *   Copyright (C) Purism SPC 2019
+ */
+
+#include <linux/gpio/consumer.h>
+#include <linux/delay.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+#include <linux/regulator/consumer.h>
+
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+#include <drm/drm_print.h>
+
+#define DRV_NAME "panel-xingbangda-xbd599"
+
+/* Manufacturer specific Commands send via DSI */
+#define ST7703_CMD_ALL_PIXEL_OFF 0x22
+#define ST7703_CMD_ALL_PIXEL_ON	 0x23
+#define ST7703_CMD_SETDISP	 0xB2
+#define ST7703_CMD_SETRGBIF	 0xB3
+#define ST7703_CMD_SETCYC	 0xB4
+#define ST7703_CMD_SETBGP	 0xB5
+#define ST7703_CMD_SETVCOM	 0xB6
+#define ST7703_CMD_SETOTP	 0xB7
+#define ST7703_CMD_SETPOWER_EXT	 0xB8
+#define ST7703_CMD_SETEXTC	 0xB9
+#define ST7703_CMD_SETMIPI	 0xBA
+#define ST7703_CMD_SETVDC	 0xBC
+#define ST7703_CMD_SETSCR	 0xC0
+#define ST7703_CMD_SETPOWER	 0xC1
+#define ST7703_CMD_UNK_C6	 0xC6
+#define ST7703_CMD_SETPANEL	 0xCC
+#define ST7703_CMD_SETGAMMA	 0xE0
+#define ST7703_CMD_SETEQ	 0xE3
+#define ST7703_CMD_SETGIP1	 0xE9
+#define ST7703_CMD_SETGIP2	 0xEA
+
+static const char * const regulator_names[] = {
+	"iovcc",
+	"vcc",
+};
+
+struct xbd599 {
+	struct device *dev;
+	struct drm_panel panel;
+	struct gpio_desc *reset_gpio;
+	struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)];
+	bool prepared;
+};
+
+static inline struct xbd599 *panel_to_xbd599(struct drm_panel *panel)
+{
+	return container_of(panel, struct xbd599, panel);
+}
+
+#define dsi_dcs_write_seq(dsi, cmd, seq...) do {			\
+		static const u8 d[] = { seq };				\
+		int ret;						\
+		ret = mipi_dsi_dcs_write(dsi, cmd, d, ARRAY_SIZE(d));	\
+		if (ret < 0)						\
+			return ret;					\
+	} while (0)
+
+static int xbd599_init_sequence(struct xbd599 *ctx)
+{
+	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
+	struct device *dev = ctx->dev;
+	int ret;
+
+	/*
+	 * Init sequence was supplied by the panel vendor.
+	 */
+	dsi_dcs_write_seq(dsi, ST7703_CMD_SETEXTC,
+			  0xF1, 0x12, 0x83);
+	dsi_dcs_write_seq(dsi, ST7703_CMD_SETMIPI,
+			  0x33, 0x81, 0x05, 0xF9, 0x0E, 0x0E, 0x20, 0x00,
+			  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x44, 0x25,
+			  0x00, 0x91, 0x0a, 0x00, 0x00, 0x02, 0x4F, 0x11,
+			  0x00, 0x00, 0x37);
+	dsi_dcs_write_seq(dsi, ST7703_CMD_SETPOWER_EXT,
+			  0x25, 0x22, 0x20, 0x03);
+	dsi_dcs_write_seq(dsi, ST7703_CMD_SETRGBIF,
+			  0x10, 0x10, 0x05, 0x05, 0x03, 0xFF, 0x00, 0x00,
+			  0x00, 0x00);
+	dsi_dcs_write_seq(dsi, ST7703_CMD_SETSCR,
+			  0x73, 0x73, 0x50, 0x50, 0x00, 0xC0, 0x08, 0x70,
+			  0x00);
+	dsi_dcs_write_seq(dsi, ST7703_CMD_SETVDC, 0x4E);
+	dsi_dcs_write_seq(dsi, ST7703_CMD_SETPANEL, 0x0B);
+	dsi_dcs_write_seq(dsi, ST7703_CMD_SETCYC, 0x80);
+	dsi_dcs_write_seq(dsi, ST7703_CMD_SETDISP, 0xF0, 0x12, 0xF0);
+	dsi_dcs_write_seq(dsi, ST7703_CMD_SETEQ,
+			  0x00, 0x00, 0x0B, 0x0B, 0x10, 0x10, 0x00, 0x00,
+			  0x00, 0x00, 0xFF, 0x00, 0xC0, 0x10);
+	dsi_dcs_write_seq(dsi, 0xC6, 0x01, 0x00, 0xFF, 0xFF, 0x00);
+	dsi_dcs_write_seq(dsi, ST7703_CMD_SETPOWER,
+			  0x74, 0x00, 0x32, 0x32, 0x77, 0xF1, 0xFF, 0xFF,
+			  0xCC, 0xCC, 0x77, 0x77);
+	dsi_dcs_write_seq(dsi, ST7703_CMD_SETBGP, 0x07, 0x07);
+	dsi_dcs_write_seq(dsi, ST7703_CMD_SETVCOM, 0x2C, 0x2C);
+	dsi_dcs_write_seq(dsi, 0xBF, 0x02, 0x11, 0x00);
+
+	dsi_dcs_write_seq(dsi, ST7703_CMD_SETGIP1,
+			  0x82, 0x10, 0x06, 0x05, 0xA2, 0x0A, 0xA5, 0x12,
+			  0x31, 0x23, 0x37, 0x83, 0x04, 0xBC, 0x27, 0x38,
+			  0x0C, 0x00, 0x03, 0x00, 0x00, 0x00, 0x0C, 0x00,
+			  0x03, 0x00, 0x00, 0x00, 0x75, 0x75, 0x31, 0x88,
+			  0x88, 0x88, 0x88, 0x88, 0x88, 0x13, 0x88, 0x64,
+			  0x64, 0x20, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88,
+			  0x02, 0x88, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+			  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00);
+	dsi_dcs_write_seq(dsi, ST7703_CMD_SETGIP2,
+			  0x02, 0x21, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+			  0x00, 0x00, 0x00, 0x00, 0x02, 0x46, 0x02, 0x88,
+			  0x88, 0x88, 0x88, 0x88, 0x88, 0x64, 0x88, 0x13,
+			  0x57, 0x13, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88,
+			  0x75, 0x88, 0x23, 0x14, 0x00, 0x00, 0x02, 0x00,
+			  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+			  0x00, 0x00, 0x00 ,0x00, 0x00, 0x00, 0x03, 0x0A,
+			  0xA5, 0x00, 0x00, 0x00, 0x00);
+	dsi_dcs_write_seq(dsi, ST7703_CMD_SETGAMMA,
+			  0x00, 0x09, 0x0D, 0x23, 0x27, 0x3C, 0x41, 0x35,
+			  0x07, 0x0D, 0x0E, 0x12, 0x13, 0x10, 0x12, 0x12,
+			  0x18, 0x00, 0x09, 0x0D, 0x23, 0x27, 0x3C, 0x41,
+			  0x35, 0x07, 0x0D, 0x0E, 0x12, 0x13, 0x10, 0x12,
+			  0x12, 0x18);
+	msleep(20);
+
+	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
+	if (ret < 0) {
+		DRM_DEV_ERROR(dev, "Failed to exit sleep mode\n");
+		return ret;
+	}
+	msleep(250);
+
+	ret = mipi_dsi_dcs_set_display_on(dsi);
+	if (ret)
+		return ret;
+	msleep(50);
+
+	DRM_DEV_DEBUG_DRIVER(dev, "Panel init sequence done\n");
+	return 0;
+}
+
+static int xbd599_disable(struct drm_panel *panel)
+{
+	struct xbd599 *ctx = panel_to_xbd599(panel);
+	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
+
+	return mipi_dsi_dcs_set_display_off(dsi);
+}
+
+static int xbd599_unprepare(struct drm_panel *panel)
+{
+	struct xbd599 *ctx = panel_to_xbd599(panel);
+
+	if (!ctx->prepared)
+		return 0;
+
+	regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+	ctx->prepared = false;
+
+	return 0;
+}
+
+static int xbd599_enable(struct drm_panel *panel)
+{
+	struct xbd599 *ctx = panel_to_xbd599(panel);
+	int ret;
+
+	ret = xbd599_init_sequence(ctx);
+	if (ret < 0) {
+		DRM_DEV_ERROR(ctx->dev, "Panel init sequence failed: %d\n",
+			      ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int xbd599_prepare(struct drm_panel *panel)
+{
+	struct xbd599 *ctx = panel_to_xbd599(panel);
+	int ret;
+
+	if (ctx->prepared)
+		return 0;
+
+	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+	if (ret)
+		return ret;
+
+	DRM_DEV_DEBUG_DRIVER(ctx->dev, "Resetting the panel\n");
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+	usleep_range(20, 40);
+	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+	msleep(20);
+
+	ctx->prepared = true;
+
+	return 0;
+}
+
+static const struct drm_display_mode xbd599_default_mode = {
+	.hdisplay    = 720,
+	.hsync_start = 720 + 40,
+	.hsync_end   = 720 + 40 + 40,
+	.htotal	     = 720 + 40 + 40 + 40,
+	.vdisplay    = 1440,
+	.vsync_start = 1440 + 18,
+	.vsync_end   = 1440 + 18 + 10,
+	.vtotal	     = 1440 + 18 + 10 + 17,
+	.vrefresh    = 60,
+	.clock	     = 69000,
+	.flags	     = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
+
+	.width_mm    = 68,
+	.height_mm   = 136,
+	.type        = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
+};
+
+static int xbd599_get_modes(struct drm_panel *panel,
+			    struct drm_connector *connector)
+{
+	struct xbd599 *ctx = panel_to_xbd599(panel);
+	struct drm_display_mode *mode;
+
+	mode = drm_mode_duplicate(connector->dev, &xbd599_default_mode);
+	if (!mode) {
+		DRM_DEV_ERROR(ctx->dev, "Failed to add mode\n");
+		return -ENOMEM;
+	}
+
+	drm_mode_set_name(mode);
+
+	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
+	connector->display_info.width_mm = mode->width_mm;
+	connector->display_info.height_mm = mode->height_mm;
+	drm_mode_probed_add(connector, mode);
+
+	return 1;
+}
+
+static const struct drm_panel_funcs xbd599_drm_funcs = {
+	.disable   = xbd599_disable,
+	.unprepare = xbd599_unprepare,
+	.enable    = xbd599_enable,
+	.prepare   = xbd599_prepare,
+	.get_modes = xbd599_get_modes,
+};
+
+static int xbd599_probe(struct mipi_dsi_device *dsi)
+{
+	struct device *dev = &dsi->dev;
+	struct xbd599 *ctx;
+	int i, ret;
+
+	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	for (i = 0; i < ARRAY_SIZE(ctx->supplies); i++)
+		ctx->supplies[i].supply = regulator_names[i];
+
+	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
+				      ctx->supplies);
+	if (ret < 0) {
+		DRM_DEV_ERROR(&dsi->dev, "cannot get regulators\n");
+		return ret;
+	}
+
+	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(ctx->reset_gpio)) {
+		DRM_DEV_ERROR(dev, "cannot get reset gpio\n");
+		return PTR_ERR(ctx->reset_gpio);
+	}
+
+	mipi_dsi_set_drvdata(dsi, ctx);
+
+	ctx->dev = dev;
+
+	dsi->lanes = 4;
+	dsi->format = MIPI_DSI_FMT_RGB888;
+	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
+
+	drm_panel_init(&ctx->panel, &dsi->dev, &xbd599_drm_funcs,
+		       DRM_MODE_CONNECTOR_DSI);
+
+	ret = drm_panel_of_backlight(&ctx->panel);
+	if (ret)
+		return ret;
+
+	drm_panel_add(&ctx->panel);
+
+	ret = mipi_dsi_attach(dsi);
+	if (ret < 0) {
+		DRM_DEV_ERROR(dev, "mipi_dsi_attach failed. Is host ready?\n");
+		drm_panel_remove(&ctx->panel);
+		return ret;
+	}
+
+	DRM_DEV_INFO(dev, "%ux%u@%u %ubpp dsi %udl - ready\n",
+		     xbd599_default_mode.hdisplay,
+		     xbd599_default_mode.vdisplay,
+		     xbd599_default_mode.vrefresh,
+		     mipi_dsi_pixel_format_to_bpp(dsi->format), dsi->lanes);
+
+	return 0;
+}
+
+static void xbd599_shutdown(struct mipi_dsi_device *dsi)
+{
+	struct xbd599 *ctx = mipi_dsi_get_drvdata(dsi);
+	int ret;
+
+	ret = xbd599_unprepare(&ctx->panel);
+	if (ret < 0)
+		DRM_DEV_ERROR(&dsi->dev, "Failed to unprepare panel: %d\n",
+			      ret);
+}
+
+static int xbd599_remove(struct mipi_dsi_device *dsi)
+{
+	struct xbd599 *ctx = mipi_dsi_get_drvdata(dsi);
+	int ret;
+
+	xbd599_shutdown(dsi);
+
+	ret = mipi_dsi_detach(dsi);
+	if (ret < 0)
+		DRM_DEV_ERROR(&dsi->dev, "Failed to detach from DSI host: %d\n",
+			      ret);
+
+	drm_panel_remove(&ctx->panel);
+
+	return 0;
+}
+
+static const struct of_device_id xbd599_of_match[] = {
+	{ .compatible = "xingbangda,xbd599", },
+	{ /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, xbd599_of_match);
+
+static struct mipi_dsi_driver xbd599_driver = {
+	.probe	= xbd599_probe,
+	.remove = xbd599_remove,
+	.shutdown = xbd599_shutdown,
+	.driver = {
+		.name = DRV_NAME,
+		.of_match_table = xbd599_of_match,
+	},
+};
+module_mipi_dsi_driver(xbd599_driver);
+
+MODULE_AUTHOR("Icenowy Zheng <icenowy@aosc.io>");
+MODULE_DESCRIPTION("DRM driver for Xingbangda XBD599 MIPI DSI panel");
+MODULE_LICENSE("GPL v2");
-- 
2.24.1

[PATCH 4/5] drm/sun4i: sun6i_mipi_dsi: fix horizontal timing calculation

[Icenowy Zheng]

The max() function call in horizontal timing calculation shouldn't pad a
length already subtracted with overhead to overhead, instead it should
only prevent the set timing to underflow.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
---
 drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
index 059939789730..5f2313c40328 100644
--- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
+++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c
@@ -555,7 +555,7 @@ static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi,
 		 */
 #define HSA_PACKET_OVERHEAD	10
 		hsa = max((unsigned int)HSA_PACKET_OVERHEAD,
-			  (mode->hsync_end - mode->hsync_start) * Bpp - HSA_PACKET_OVERHEAD);
+			  (mode->hsync_end - mode->hsync_start) * Bpp) - HSA_PACKET_OVERHEAD;
 
 		/*
 		 * The backporch is set using a blanking packet (4
@@ -564,7 +564,7 @@ static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi,
 		 */
 #define HBP_PACKET_OVERHEAD	6
 		hbp = max((unsigned int)HBP_PACKET_OVERHEAD,
-			  (mode->htotal - mode->hsync_end) * Bpp - HBP_PACKET_OVERHEAD);
+			  (mode->htotal - mode->hsync_end) * Bpp) - HBP_PACKET_OVERHEAD;
 
 		/*
 		 * The frontporch is set using a sync event (4 bytes)
@@ -574,7 +574,7 @@ static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi,
 		 */
 #define HFP_PACKET_OVERHEAD	16
 		hfp = max((unsigned int)HFP_PACKET_OVERHEAD,
-			  (mode->hsync_start - mode->hdisplay) * Bpp - HFP_PACKET_OVERHEAD);
+			  (mode->hsync_start - mode->hdisplay) * Bpp) - HFP_PACKET_OVERHEAD;
 
 		/*
 		 * The blanking is set using a sync event (4 bytes)
@@ -583,8 +583,8 @@ static void sun6i_dsi_setup_timings(struct sun6i_dsi *dsi,
 		 */
 #define HBLK_PACKET_OVERHEAD	10
 		hblk = max((unsigned int)HBLK_PACKET_OVERHEAD,
-			   (mode->htotal - (mode->hsync_end - mode->hsync_start)) * Bpp -
-			   HBLK_PACKET_OVERHEAD);
+			   (mode->htotal - (mode->hsync_end - mode->hsync_start)) * Bpp) -
+			   HBLK_PACKET_OVERHEAD;
 
 		/*
 		 * And I'm not entirely sure what vblk is about. The driver in
-- 
2.24.1

[PATCH 5/5] arm64: allwinner: dts: a64: add LCD-related device nodes for PinePhone

[Icenowy Zheng]

PinePhone uses PWM backlight and a XBD599 LCD panel over DSI for
display.

Add its device nodes.

Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
---
 .../dts/allwinner/sun50i-a64-pinephone.dtsi   | 37 +++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi b/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi
index cefda145c3c9..96d9150423e0 100644
--- a/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi
+++ b/arch/arm64/boot/dts/allwinner/sun50i-a64-pinephone.dtsi
@@ -16,6 +16,15 @@ aliases {
 		serial0 = &uart0;
 	};
 
+	backlight: backlight {
+		compatible = "pwm-backlight";
+		pwms = <&r_pwm 0 50000 PWM_POLARITY_INVERTED>;
+		brightness-levels = <0 16 18 20 22 24 26 29 32 35 38 42 46 51 56 62 68 75 83 91 100>;
+		default-brightness-level = <15>;
+		enable-gpios = <&pio 7 10 GPIO_ACTIVE_HIGH>; /* PH10 */
+		power-supply = <&reg_ldo_io0>;
+	};
+
 	chosen {
 		stdout-path = "serial0:115200n8";
 	};
@@ -84,6 +93,30 @@ &dai {
 	status = "okay";
 };
 
+&de {
+	status = "okay";
+};
+
+&dphy {
+	status = "okay";
+};
+
+&dsi {
+	vcc-dsi-supply = <&reg_dldo1>;
+	#address-cells = <1>;
+	#size-cells = <0>;
+	status = "okay";
+
+	panel@0 {
+		compatible = "xingbangda,xbd599";
+		reg = <0>;
+		reset-gpios = <&pio 3 23 GPIO_ACTIVE_LOW>; /* PD23 */
+		iovcc-supply = <&reg_dldo2>;
+		vcc-supply = <&reg_ldo_io0>;
+		backlight = <&backlight>;
+	};
+};
+
 &ehci0 {
 	status = "okay";
 };
@@ -188,6 +221,10 @@ &r_pio {
 	 */
 };
 
+&r_pwm {
+	status = "okay";
+};
+
 &r_rsb {
 	status = "okay";
 
-- 
2.24.1

Re: [PATCH 2/5] dt-bindings: panel: add binding for Xingbangda XBD599 panel

[Rob Herring]

On Thu, 12 Mar 2020 00:33:26 +0800, Icenowy Zheng wrote:
> Xingbangda XBD599 is a 5.99" 720x1440 MIPI-DSI LCD panel.
> 
> Add its device tree binding.
> 
> Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
> ---
>  .../display/panel/xingbangda,xbd599.yaml      | 50 +++++++++++++++++++
>  1 file changed, 50 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/panel/xingbangda,xbd599.yaml
> 

My bot found errors running 'make dt_binding_check' on your patch:

Error: Documentation/devicetree/bindings/display/panel/xingbangda,xbd599.example.dts:17.1-5 syntax error
FATAL ERROR: Unable to parse input tree
scripts/Makefile.lib:311: recipe for target 'Documentation/devicetree/bindings/display/panel/xingbangda,xbd599.example.dt.yaml' failed
make[1]: *** [Documentation/devicetree/bindings/display/panel/xingbangda,xbd599.example.dt.yaml] Error 1
make[1]: *** Waiting for unfinished jobs....
Makefile:1262: recipe for target 'dt_binding_check' failed
make: *** [dt_binding_check] Error 2

See https://patchwork.ozlabs.org/patch/1253057
Please check and re-submit.

Re: [PATCH 2/5] dt-bindings: panel: add binding for Xingbangda XBD599 panel

[Sam Ravnborg]

Hi Icenowy

A few comment below.

	Sam

On Thu, Mar 12, 2020 at 12:33:26AM +0800, Icenowy Zheng wrote:
> Xingbangda XBD599 is a 5.99" 720x1440 MIPI-DSI LCD panel.
> 
> Add its device tree binding.
> 
> Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
> ---
>  .../display/panel/xingbangda,xbd599.yaml      | 50 +++++++++++++++++++
>  1 file changed, 50 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/panel/xingbangda,xbd599.yaml
> 
> diff --git a/Documentation/devicetree/bindings/display/panel/xingbangda,xbd599.yaml b/Documentation/devicetree/bindings/display/panel/xingbangda,xbd599.yaml
> new file mode 100644
> index 000000000000..62816b34de31
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/panel/xingbangda,xbd599.yaml
> @@ -0,0 +1,50 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/panel/xingbangda,xbd599.yaml#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Xingbangda XBD599 5.99in MIPI-DSI LCD panel
> +
> +maintainers:
> +  - Icenowy Zheng <icenowy@aosc.io>
> +
> +allOf:
> +  - $ref: panel-common.yaml#
> +
> +properties:
> +  compatible:
> +    const: xingbangda,xbd599
> +  reg: true
> +  backlight: true
> +  reset-gpios: true
> +  vcc-supply:
> +     description: regulator that supplies the VCC voltage
Fix indent - two chars, not three

> +  iovcc-supply:
> +     description: regulator that supplies the IOVCC voltage
Same here

> +
> +required:
> +  - compatible
> +  - reg
> +  - backlight
> +  - vcc-supply
> +  - iovcc-supply
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    &dsi {
Remove '&' - dt_binding_check will fail otherwise

> +        #address-cells = <1>;
> +        #size-cells = <0>;
> +
> +        panel@0 {
> +            compatible = "xingbangda,xbd599";
> +            reg = <0>;
> +            backlight = <&backlight>;
> +            iovcc-supply = <&reg_dldo2>;
> +            vcc-supply = <&reg_ldo_io0>;
> +        };
> +    };
> +
> +...
> -- 
> 2.24.1

Re: [PATCH 3/5] drm: panel: add Xingbangda XBD599 panel

[Sam Ravnborg]

Hi Icenowy

A few details in the following.

	Sam

On Thu, Mar 12, 2020 at 12:33:27AM +0800, Icenowy Zheng wrote:
> Xingbangda XBD599 is a 5.99" 720x1440 MIPI-DSI IPS LCD panel made by
> Xingbangda, which is used on PinePhone final assembled phones.
> 
> Add support for it.
> 
> Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
> ---
>  drivers/gpu/drm/panel/Kconfig                 |   9 +
>  drivers/gpu/drm/panel/Makefile                |   1 +
>  .../gpu/drm/panel/panel-xingbangda-xbd599.c   | 367 ++++++++++++++++++
>  3 files changed, 377 insertions(+)
>  create mode 100644 drivers/gpu/drm/panel/panel-xingbangda-xbd599.c
> 
> +++ b/drivers/gpu/drm/panel/panel-xingbangda-xbd599.c
> @@ -0,0 +1,367 @@
> +// SPDX-License-Identifier: GPL-2.0
> +/*
> + * Xingbangda XBD599 MIPI-DSI panel driver
> + *
> + * Copyright (C) 2019 Icenowy Zheng <icenowy@aosc.io>
2020?

> + *
> + * Based on panel-rocktech-jh057n00900.c, which is:
> + *   Copyright (C) Purism SPC 2019
> + */
> +
> +#include <linux/gpio/consumer.h>
> +#include <linux/delay.h>
> +#include <linux/mod_devicetable.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +#include <linux/regulator/consumer.h>
Sort alphabetically.

> +
> +#include <drm/drm_mipi_dsi.h>
> +#include <drm/drm_modes.h>
> +#include <drm/drm_panel.h>
> +#include <drm/drm_print.h>
> +
> +#define DRV_NAME "panel-xingbangda-xbd599"
No reason for this indirection, it is only used once

> +
> +/* Manufacturer specific Commands send via DSI */
> +#define ST7703_CMD_ALL_PIXEL_OFF 0x22
> +#define ST7703_CMD_ALL_PIXEL_ON	 0x23
> +#define ST7703_CMD_SETDISP	 0xB2
> +#define ST7703_CMD_SETRGBIF	 0xB3
> +#define ST7703_CMD_SETCYC	 0xB4
> +#define ST7703_CMD_SETBGP	 0xB5
> +#define ST7703_CMD_SETVCOM	 0xB6
> +#define ST7703_CMD_SETOTP	 0xB7
> +#define ST7703_CMD_SETPOWER_EXT	 0xB8
> +#define ST7703_CMD_SETEXTC	 0xB9
> +#define ST7703_CMD_SETMIPI	 0xBA
> +#define ST7703_CMD_SETVDC	 0xBC
> +#define ST7703_CMD_SETSCR	 0xC0
> +#define ST7703_CMD_SETPOWER	 0xC1
> +#define ST7703_CMD_UNK_C6	 0xC6
> +#define ST7703_CMD_SETPANEL	 0xCC
> +#define ST7703_CMD_SETGAMMA	 0xE0
> +#define ST7703_CMD_SETEQ	 0xE3
> +#define ST7703_CMD_SETGIP1	 0xE9
> +#define ST7703_CMD_SETGIP2	 0xEA
> +
> +static const char * const regulator_names[] = {
> +	"iovcc",
> +	"vcc",
> +};
> +
> +struct xbd599 {
> +	struct device *dev;
> +	struct drm_panel panel;
> +	struct gpio_desc *reset_gpio;
> +	struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)];
> +	bool prepared;
> +};
> +
> +static inline struct xbd599 *panel_to_xbd599(struct drm_panel *panel)
> +{
> +	return container_of(panel, struct xbd599, panel);
> +}
> +
> +#define dsi_dcs_write_seq(dsi, cmd, seq...) do {			\
> +		static const u8 d[] = { seq };				\
> +		int ret;						\
> +		ret = mipi_dsi_dcs_write(dsi, cmd, d, ARRAY_SIZE(d));	\
> +		if (ret < 0)						\
> +			return ret;					\
> +	} while (0)
> +
> +static int xbd599_init_sequence(struct xbd599 *ctx)
> +{
> +	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
> +	struct device *dev = ctx->dev;
> +	int ret;
> +
> +	/*
> +	 * Init sequence was supplied by the panel vendor.
> +	 */
> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETEXTC,
> +			  0xF1, 0x12, 0x83);
> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETMIPI,
> +			  0x33, 0x81, 0x05, 0xF9, 0x0E, 0x0E, 0x20, 0x00,
> +			  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x44, 0x25,
> +			  0x00, 0x91, 0x0a, 0x00, 0x00, 0x02, 0x4F, 0x11,
> +			  0x00, 0x00, 0x37);
> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETPOWER_EXT,
> +			  0x25, 0x22, 0x20, 0x03);
> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETRGBIF,
> +			  0x10, 0x10, 0x05, 0x05, 0x03, 0xFF, 0x00, 0x00,
> +			  0x00, 0x00);
> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETSCR,
> +			  0x73, 0x73, 0x50, 0x50, 0x00, 0xC0, 0x08, 0x70,
> +			  0x00);
> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETVDC, 0x4E);
> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETPANEL, 0x0B);
> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETCYC, 0x80);
> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETDISP, 0xF0, 0x12, 0xF0);
> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETEQ,
> +			  0x00, 0x00, 0x0B, 0x0B, 0x10, 0x10, 0x00, 0x00,
> +			  0x00, 0x00, 0xFF, 0x00, 0xC0, 0x10);
> +	dsi_dcs_write_seq(dsi, 0xC6, 0x01, 0x00, 0xFF, 0xFF, 0x00);
> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETPOWER,
> +			  0x74, 0x00, 0x32, 0x32, 0x77, 0xF1, 0xFF, 0xFF,
> +			  0xCC, 0xCC, 0x77, 0x77);
> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETBGP, 0x07, 0x07);
> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETVCOM, 0x2C, 0x2C);
> +	dsi_dcs_write_seq(dsi, 0xBF, 0x02, 0x11, 0x00);
> +
> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETGIP1,
> +			  0x82, 0x10, 0x06, 0x05, 0xA2, 0x0A, 0xA5, 0x12,
> +			  0x31, 0x23, 0x37, 0x83, 0x04, 0xBC, 0x27, 0x38,
> +			  0x0C, 0x00, 0x03, 0x00, 0x00, 0x00, 0x0C, 0x00,
> +			  0x03, 0x00, 0x00, 0x00, 0x75, 0x75, 0x31, 0x88,
> +			  0x88, 0x88, 0x88, 0x88, 0x88, 0x13, 0x88, 0x64,
> +			  0x64, 0x20, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88,
> +			  0x02, 0x88, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> +			  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00);
> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETGIP2,
> +			  0x02, 0x21, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> +			  0x00, 0x00, 0x00, 0x00, 0x02, 0x46, 0x02, 0x88,
> +			  0x88, 0x88, 0x88, 0x88, 0x88, 0x64, 0x88, 0x13,
> +			  0x57, 0x13, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88,
> +			  0x75, 0x88, 0x23, 0x14, 0x00, 0x00, 0x02, 0x00,
> +			  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
> +			  0x00, 0x00, 0x00 ,0x00, 0x00, 0x00, 0x03, 0x0A,
> +			  0xA5, 0x00, 0x00, 0x00, 0x00);
> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETGAMMA,
> +			  0x00, 0x09, 0x0D, 0x23, 0x27, 0x3C, 0x41, 0x35,
> +			  0x07, 0x0D, 0x0E, 0x12, 0x13, 0x10, 0x12, 0x12,
> +			  0x18, 0x00, 0x09, 0x0D, 0x23, 0x27, 0x3C, 0x41,
> +			  0x35, 0x07, 0x0D, 0x0E, 0x12, 0x13, 0x10, 0x12,
> +			  0x12, 0x18);
> +	msleep(20);
> +
> +	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
> +	if (ret < 0) {
> +		DRM_DEV_ERROR(dev, "Failed to exit sleep mode\n");
> +		return ret;
> +	}
> +	msleep(250);
> +
> +	ret = mipi_dsi_dcs_set_display_on(dsi);
> +	if (ret)
> +		return ret;
> +	msleep(50);
> +
> +	DRM_DEV_DEBUG_DRIVER(dev, "Panel init sequence done\n");
> +	return 0;
> +}
> +
> +static int xbd599_disable(struct drm_panel *panel)
> +{
> +	struct xbd599 *ctx = panel_to_xbd599(panel);
> +	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
> +
> +	return mipi_dsi_dcs_set_display_off(dsi);
> +}
The following is the same for many panels but anyway.

The init order for a display is

    prepare
    enable

    # Display is now fully operational

    disable
    unprepare

    # display is now off and turned off (no power)

So when reading panel drivers my personal preference is to read the
functions in that order - this makes it easier to follow the sequence.

Thats just my personal opinion - so feel free to ignore.

> +
> +static int xbd599_unprepare(struct drm_panel *panel)
> +{
> +	struct xbd599 *ctx = panel_to_xbd599(panel);
> +
> +	if (!ctx->prepared)
> +		return 0;
> +
> +	regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
> +	ctx->prepared = false;
> +
> +	return 0;
> +}
Maybe activate reset before power is turned off.
So when power is turned on again later the panel is kept in reset.

This would also make this a closer mirror of what is done in prepare()

> +
> +static int xbd599_enable(struct drm_panel *panel)
> +{
> +	struct xbd599 *ctx = panel_to_xbd599(panel);
> +	int ret;
> +
> +	ret = xbd599_init_sequence(ctx);
> +	if (ret < 0) {
> +		DRM_DEV_ERROR(ctx->dev, "Panel init sequence failed: %d\n",
> +			      ret);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int xbd599_prepare(struct drm_panel *panel)
> +{
> +	struct xbd599 *ctx = panel_to_xbd599(panel);
> +	int ret;
> +
> +	if (ctx->prepared)
> +		return 0;
> +
> +	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
> +	if (ret)
> +		return ret;
> +
> +	DRM_DEV_DEBUG_DRIVER(ctx->dev, "Resetting the panel\n");
> +	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
> +	usleep_range(20, 40);
> +	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
> +	msleep(20);
> +
> +	ctx->prepared = true;
> +
> +	return 0;
> +}
> +
> +static const struct drm_display_mode xbd599_default_mode = {
> +	.hdisplay    = 720,
> +	.hsync_start = 720 + 40,
> +	.hsync_end   = 720 + 40 + 40,
> +	.htotal	     = 720 + 40 + 40 + 40,
> +	.vdisplay    = 1440,
> +	.vsync_start = 1440 + 18,
> +	.vsync_end   = 1440 + 18 + 10,
> +	.vtotal	     = 1440 + 18 + 10 + 17,
> +	.vrefresh    = 60,
> +	.clock	     = 69000,
> +	.flags	     = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
> +
> +	.width_mm    = 68,
> +	.height_mm   = 136,
> +	.type        = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
> +};
> +
> +static int xbd599_get_modes(struct drm_panel *panel,
> +			    struct drm_connector *connector)
> +{
> +	struct xbd599 *ctx = panel_to_xbd599(panel);
> +	struct drm_display_mode *mode;
> +
> +	mode = drm_mode_duplicate(connector->dev, &xbd599_default_mode);
> +	if (!mode) {
> +		DRM_DEV_ERROR(ctx->dev, "Failed to add mode\n");
> +		return -ENOMEM;
> +	}
> +
> +	drm_mode_set_name(mode);
> +
> +	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
> +	connector->display_info.width_mm = mode->width_mm;
> +	connector->display_info.height_mm = mode->height_mm;
> +	drm_mode_probed_add(connector, mode);
> +
> +	return 1;
> +}
> +
> +static const struct drm_panel_funcs xbd599_drm_funcs = {
> +	.disable   = xbd599_disable,
> +	.unprepare = xbd599_unprepare,
> +	.enable    = xbd599_enable,
> +	.prepare   = xbd599_prepare,
> +	.get_modes = xbd599_get_modes,
> +};
> +
> +static int xbd599_probe(struct mipi_dsi_device *dsi)
> +{
> +	struct device *dev = &dsi->dev;
> +	struct xbd599 *ctx;
> +	int i, ret;
> +
> +	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
> +	if (!ctx)
> +		return -ENOMEM;
> +
> +	for (i = 0; i < ARRAY_SIZE(ctx->supplies); i++)
> +		ctx->supplies[i].supply = regulator_names[i];
> +
> +	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
> +				      ctx->supplies);
> +	if (ret < 0) {
> +		DRM_DEV_ERROR(&dsi->dev, "cannot get regulators\n");
> +		return ret;
> +	}
> +
> +	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
> +	if (IS_ERR(ctx->reset_gpio)) {
> +		DRM_DEV_ERROR(dev, "cannot get reset gpio\n");
> +		return PTR_ERR(ctx->reset_gpio);
> +	}
> +
> +	mipi_dsi_set_drvdata(dsi, ctx);
> +
> +	ctx->dev = dev;
> +
> +	dsi->lanes = 4;
> +	dsi->format = MIPI_DSI_FMT_RGB888;
> +	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
> +
> +	drm_panel_init(&ctx->panel, &dsi->dev, &xbd599_drm_funcs,
> +		       DRM_MODE_CONNECTOR_DSI);
> +
> +	ret = drm_panel_of_backlight(&ctx->panel);
> +	if (ret)
> +		return ret;
> +
> +	drm_panel_add(&ctx->panel);
> +
> +	ret = mipi_dsi_attach(dsi);
> +	if (ret < 0) {
> +		DRM_DEV_ERROR(dev, "mipi_dsi_attach failed. Is host ready?\n");
> +		drm_panel_remove(&ctx->panel);
> +		return ret;
> +	}
> +
> +	DRM_DEV_INFO(dev, "%ux%u@%u %ubpp dsi %udl - ready\n",
> +		     xbd599_default_mode.hdisplay,
> +		     xbd599_default_mode.vdisplay,
> +		     xbd599_default_mode.vrefresh,
> +		     mipi_dsi_pixel_format_to_bpp(dsi->format), dsi->lanes);
> +
> +	return 0;
> +}
> +
> +static void xbd599_shutdown(struct mipi_dsi_device *dsi)
> +{
> +	struct xbd599 *ctx = mipi_dsi_get_drvdata(dsi);
> +	int ret;
> +
> +	ret = xbd599_unprepare(&ctx->panel);

Use drm_panel_unprepare().
There may be, or may come functionality in drm_panel that is required.

> +	if (ret < 0)
> +		DRM_DEV_ERROR(&dsi->dev, "Failed to unprepare panel: %d\n",
> +			      ret);
> +}
> +
> +static int xbd599_remove(struct mipi_dsi_device *dsi)
> +{
> +	struct xbd599 *ctx = mipi_dsi_get_drvdata(dsi);
> +	int ret;
> +
> +	xbd599_shutdown(dsi);
> +
> +	ret = mipi_dsi_detach(dsi);
> +	if (ret < 0)
> +		DRM_DEV_ERROR(&dsi->dev, "Failed to detach from DSI host: %d\n",
> +			      ret);
> +
> +	drm_panel_remove(&ctx->panel);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id xbd599_of_match[] = {
> +	{ .compatible = "xingbangda,xbd599", },
> +	{ /* sentinel */ }
> +};
> +MODULE_DEVICE_TABLE(of, xbd599_of_match);
> +
> +static struct mipi_dsi_driver xbd599_driver = {
> +	.probe	= xbd599_probe,
> +	.remove = xbd599_remove,
> +	.shutdown = xbd599_shutdown,
> +	.driver = {
> +		.name = DRV_NAME,
> +		.of_match_table = xbd599_of_match,
> +	},
> +};
> +module_mipi_dsi_driver(xbd599_driver);
> +
> +MODULE_AUTHOR("Icenowy Zheng <icenowy@aosc.io>");
> +MODULE_DESCRIPTION("DRM driver for Xingbangda XBD599 MIPI DSI panel");
> +MODULE_LICENSE("GPL v2");
> -- 
> 2.24.1

Re: [PATCH 3/5] drm: panel: add Xingbangda XBD599 panel

[Icenowy Zheng]

于 2020年3月14日 GMT+08:00 下午4:00:00, Sam Ravnborg <sam@ravnborg.org> 写到:
>Hi Icenowy
>
>A few details in the following.
>
>	Sam
>
>On Thu, Mar 12, 2020 at 12:33:27AM +0800, Icenowy Zheng wrote:
>> Xingbangda XBD599 is a 5.99" 720x1440 MIPI-DSI IPS LCD panel made by
>> Xingbangda, which is used on PinePhone final assembled phones.
>> 
>> Add support for it.
>> 
>> Signed-off-by: Icenowy Zheng <icenowy@aosc.io>
>> ---
>>  drivers/gpu/drm/panel/Kconfig                 |   9 +
>>  drivers/gpu/drm/panel/Makefile                |   1 +
>>  .../gpu/drm/panel/panel-xingbangda-xbd599.c   | 367
>++++++++++++++++++
>>  3 files changed, 377 insertions(+)
>>  create mode 100644 drivers/gpu/drm/panel/panel-xingbangda-xbd599.c
>> 
>> +++ b/drivers/gpu/drm/panel/panel-xingbangda-xbd599.c
>> @@ -0,0 +1,367 @@
>> +// SPDX-License-Identifier: GPL-2.0
>> +/*
>> + * Xingbangda XBD599 MIPI-DSI panel driver
>> + *
>> + * Copyright (C) 2019 Icenowy Zheng <icenowy@aosc.io>
>2020?

The work started at Mid 2019.

Is 2019-2020 okay?

>
>> + *
>> + * Based on panel-rocktech-jh057n00900.c, which is:
>> + *   Copyright (C) Purism SPC 2019
>> + */
>> +
>> +#include <linux/gpio/consumer.h>
>> +#include <linux/delay.h>
>> +#include <linux/mod_devicetable.h>
>> +#include <linux/module.h>
>> +#include <linux/of_device.h>
>> +#include <linux/regulator/consumer.h>
>Sort alphabetically.
>
>> +
>> +#include <drm/drm_mipi_dsi.h>
>> +#include <drm/drm_modes.h>
>> +#include <drm/drm_panel.h>
>> +#include <drm/drm_print.h>
>> +
>> +#define DRV_NAME "panel-xingbangda-xbd599"
>No reason for this indirection, it is only used once
>
>> +
>> +/* Manufacturer specific Commands send via DSI */
>> +#define ST7703_CMD_ALL_PIXEL_OFF 0x22
>> +#define ST7703_CMD_ALL_PIXEL_ON	 0x23
>> +#define ST7703_CMD_SETDISP	 0xB2
>> +#define ST7703_CMD_SETRGBIF	 0xB3
>> +#define ST7703_CMD_SETCYC	 0xB4
>> +#define ST7703_CMD_SETBGP	 0xB5
>> +#define ST7703_CMD_SETVCOM	 0xB6
>> +#define ST7703_CMD_SETOTP	 0xB7
>> +#define ST7703_CMD_SETPOWER_EXT	 0xB8
>> +#define ST7703_CMD_SETEXTC	 0xB9
>> +#define ST7703_CMD_SETMIPI	 0xBA
>> +#define ST7703_CMD_SETVDC	 0xBC
>> +#define ST7703_CMD_SETSCR	 0xC0
>> +#define ST7703_CMD_SETPOWER	 0xC1
>> +#define ST7703_CMD_UNK_C6	 0xC6
>> +#define ST7703_CMD_SETPANEL	 0xCC
>> +#define ST7703_CMD_SETGAMMA	 0xE0
>> +#define ST7703_CMD_SETEQ	 0xE3
>> +#define ST7703_CMD_SETGIP1	 0xE9
>> +#define ST7703_CMD_SETGIP2	 0xEA
>> +
>> +static const char * const regulator_names[] = {
>> +	"iovcc",
>> +	"vcc",
>> +};
>> +
>> +struct xbd599 {
>> +	struct device *dev;
>> +	struct drm_panel panel;
>> +	struct gpio_desc *reset_gpio;
>> +	struct regulator_bulk_data supplies[ARRAY_SIZE(regulator_names)];
>> +	bool prepared;
>> +};
>> +
>> +static inline struct xbd599 *panel_to_xbd599(struct drm_panel
>*panel)
>> +{
>> +	return container_of(panel, struct xbd599, panel);
>> +}
>> +
>> +#define dsi_dcs_write_seq(dsi, cmd, seq...) do {			\
>> +		static const u8 d[] = { seq };				\
>> +		int ret;						\
>> +		ret = mipi_dsi_dcs_write(dsi, cmd, d, ARRAY_SIZE(d));	\
>> +		if (ret < 0)						\
>> +			return ret;					\
>> +	} while (0)
>> +
>> +static int xbd599_init_sequence(struct xbd599 *ctx)
>> +{
>> +	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
>> +	struct device *dev = ctx->dev;
>> +	int ret;
>> +
>> +	/*
>> +	 * Init sequence was supplied by the panel vendor.
>> +	 */
>> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETEXTC,
>> +			  0xF1, 0x12, 0x83);
>> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETMIPI,
>> +			  0x33, 0x81, 0x05, 0xF9, 0x0E, 0x0E, 0x20, 0x00,
>> +			  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x44, 0x25,
>> +			  0x00, 0x91, 0x0a, 0x00, 0x00, 0x02, 0x4F, 0x11,
>> +			  0x00, 0x00, 0x37);
>> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETPOWER_EXT,
>> +			  0x25, 0x22, 0x20, 0x03);
>> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETRGBIF,
>> +			  0x10, 0x10, 0x05, 0x05, 0x03, 0xFF, 0x00, 0x00,
>> +			  0x00, 0x00);
>> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETSCR,
>> +			  0x73, 0x73, 0x50, 0x50, 0x00, 0xC0, 0x08, 0x70,
>> +			  0x00);
>> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETVDC, 0x4E);
>> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETPANEL, 0x0B);
>> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETCYC, 0x80);
>> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETDISP, 0xF0, 0x12, 0xF0);
>> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETEQ,
>> +			  0x00, 0x00, 0x0B, 0x0B, 0x10, 0x10, 0x00, 0x00,
>> +			  0x00, 0x00, 0xFF, 0x00, 0xC0, 0x10);
>> +	dsi_dcs_write_seq(dsi, 0xC6, 0x01, 0x00, 0xFF, 0xFF, 0x00);
>> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETPOWER,
>> +			  0x74, 0x00, 0x32, 0x32, 0x77, 0xF1, 0xFF, 0xFF,
>> +			  0xCC, 0xCC, 0x77, 0x77);
>> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETBGP, 0x07, 0x07);
>> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETVCOM, 0x2C, 0x2C);
>> +	dsi_dcs_write_seq(dsi, 0xBF, 0x02, 0x11, 0x00);
>> +
>> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETGIP1,
>> +			  0x82, 0x10, 0x06, 0x05, 0xA2, 0x0A, 0xA5, 0x12,
>> +			  0x31, 0x23, 0x37, 0x83, 0x04, 0xBC, 0x27, 0x38,
>> +			  0x0C, 0x00, 0x03, 0x00, 0x00, 0x00, 0x0C, 0x00,
>> +			  0x03, 0x00, 0x00, 0x00, 0x75, 0x75, 0x31, 0x88,
>> +			  0x88, 0x88, 0x88, 0x88, 0x88, 0x13, 0x88, 0x64,
>> +			  0x64, 0x20, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88,
>> +			  0x02, 0x88, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
>> +			  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00);
>> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETGIP2,
>> +			  0x02, 0x21, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
>> +			  0x00, 0x00, 0x00, 0x00, 0x02, 0x46, 0x02, 0x88,
>> +			  0x88, 0x88, 0x88, 0x88, 0x88, 0x64, 0x88, 0x13,
>> +			  0x57, 0x13, 0x88, 0x88, 0x88, 0x88, 0x88, 0x88,
>> +			  0x75, 0x88, 0x23, 0x14, 0x00, 0x00, 0x02, 0x00,
>> +			  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
>> +			  0x00, 0x00, 0x00 ,0x00, 0x00, 0x00, 0x03, 0x0A,
>> +			  0xA5, 0x00, 0x00, 0x00, 0x00);
>> +	dsi_dcs_write_seq(dsi, ST7703_CMD_SETGAMMA,
>> +			  0x00, 0x09, 0x0D, 0x23, 0x27, 0x3C, 0x41, 0x35,
>> +			  0x07, 0x0D, 0x0E, 0x12, 0x13, 0x10, 0x12, 0x12,
>> +			  0x18, 0x00, 0x09, 0x0D, 0x23, 0x27, 0x3C, 0x41,
>> +			  0x35, 0x07, 0x0D, 0x0E, 0x12, 0x13, 0x10, 0x12,
>> +			  0x12, 0x18);
>> +	msleep(20);
>> +
>> +	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
>> +	if (ret < 0) {
>> +		DRM_DEV_ERROR(dev, "Failed to exit sleep mode\n");
>> +		return ret;
>> +	}
>> +	msleep(250);
>> +
>> +	ret = mipi_dsi_dcs_set_display_on(dsi);
>> +	if (ret)
>> +		return ret;
>> +	msleep(50);
>> +
>> +	DRM_DEV_DEBUG_DRIVER(dev, "Panel init sequence done\n");
>> +	return 0;
>> +}
>> +
>> +static int xbd599_disable(struct drm_panel *panel)
>> +{
>> +	struct xbd599 *ctx = panel_to_xbd599(panel);
>> +	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
>> +
>> +	return mipi_dsi_dcs_set_display_off(dsi);
>> +}
>The following is the same for many panels but anyway.
>
>The init order for a display is
>
>    prepare
>    enable
>
>    # Display is now fully operational
>
>    disable
>    unprepare
>
>    # display is now off and turned off (no power)
>
>So when reading panel drivers my personal preference is to read the
>functions in that order - this makes it easier to follow the sequence.
>
>Thats just my personal opinion - so feel free to ignore.
>
>> +
>> +static int xbd599_unprepare(struct drm_panel *panel)
>> +{
>> +	struct xbd599 *ctx = panel_to_xbd599(panel);
>> +
>> +	if (!ctx->prepared)
>> +		return 0;
>> +
>> +	regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
>> +	ctx->prepared = false;
>> +
>> +	return 0;
>> +}
>Maybe activate reset before power is turned off.
>So when power is turned on again later the panel is kept in reset.
>
>This would also make this a closer mirror of what is done in prepare()
>
>> +
>> +static int xbd599_enable(struct drm_panel *panel)
>> +{
>> +	struct xbd599 *ctx = panel_to_xbd599(panel);
>> +	int ret;
>> +
>> +	ret = xbd599_init_sequence(ctx);
>> +	if (ret < 0) {
>> +		DRM_DEV_ERROR(ctx->dev, "Panel init sequence failed: %d\n",
>> +			      ret);
>> +		return ret;
>> +	}
>> +
>> +	return 0;
>> +}
>> +
>> +static int xbd599_prepare(struct drm_panel *panel)
>> +{
>> +	struct xbd599 *ctx = panel_to_xbd599(panel);
>> +	int ret;
>> +
>> +	if (ctx->prepared)
>> +		return 0;
>> +
>> +	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies),
>ctx->supplies);
>> +	if (ret)
>> +		return ret;
>> +
>> +	DRM_DEV_DEBUG_DRIVER(ctx->dev, "Resetting the panel\n");
>> +	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
>> +	usleep_range(20, 40);
>> +	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
>> +	msleep(20);
>> +
>> +	ctx->prepared = true;
>> +
>> +	return 0;
>> +}
>> +
>> +static const struct drm_display_mode xbd599_default_mode = {
>> +	.hdisplay    = 720,
>> +	.hsync_start = 720 + 40,
>> +	.hsync_end   = 720 + 40 + 40,
>> +	.htotal	     = 720 + 40 + 40 + 40,
>> +	.vdisplay    = 1440,
>> +	.vsync_start = 1440 + 18,
>> +	.vsync_end   = 1440 + 18 + 10,
>> +	.vtotal	     = 1440 + 18 + 10 + 17,
>> +	.vrefresh    = 60,
>> +	.clock	     = 69000,
>> +	.flags	     = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
>> +
>> +	.width_mm    = 68,
>> +	.height_mm   = 136,
>> +	.type        = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
>> +};
>> +
>> +static int xbd599_get_modes(struct drm_panel *panel,
>> +			    struct drm_connector *connector)
>> +{
>> +	struct xbd599 *ctx = panel_to_xbd599(panel);
>> +	struct drm_display_mode *mode;
>> +
>> +	mode = drm_mode_duplicate(connector->dev, &xbd599_default_mode);
>> +	if (!mode) {
>> +		DRM_DEV_ERROR(ctx->dev, "Failed to add mode\n");
>> +		return -ENOMEM;
>> +	}
>> +
>> +	drm_mode_set_name(mode);
>> +
>> +	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
>> +	connector->display_info.width_mm = mode->width_mm;
>> +	connector->display_info.height_mm = mode->height_mm;
>> +	drm_mode_probed_add(connector, mode);
>> +
>> +	return 1;
>> +}
>> +
>> +static const struct drm_panel_funcs xbd599_drm_funcs = {
>> +	.disable   = xbd599_disable,
>> +	.unprepare = xbd599_unprepare,
>> +	.enable    = xbd599_enable,
>> +	.prepare   = xbd599_prepare,
>> +	.get_modes = xbd599_get_modes,
>> +};
>> +
>> +static int xbd599_probe(struct mipi_dsi_device *dsi)
>> +{
>> +	struct device *dev = &dsi->dev;
>> +	struct xbd599 *ctx;
>> +	int i, ret;
>> +
>> +	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
>> +	if (!ctx)
>> +		return -ENOMEM;
>> +
>> +	for (i = 0; i < ARRAY_SIZE(ctx->supplies); i++)
>> +		ctx->supplies[i].supply = regulator_names[i];
>> +
>> +	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
>> +				      ctx->supplies);
>> +	if (ret < 0) {
>> +		DRM_DEV_ERROR(&dsi->dev, "cannot get regulators\n");
>> +		return ret;
>> +	}
>> +
>> +	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
>> +	if (IS_ERR(ctx->reset_gpio)) {
>> +		DRM_DEV_ERROR(dev, "cannot get reset gpio\n");
>> +		return PTR_ERR(ctx->reset_gpio);
>> +	}
>> +
>> +	mipi_dsi_set_drvdata(dsi, ctx);
>> +
>> +	ctx->dev = dev;
>> +
>> +	dsi->lanes = 4;
>> +	dsi->format = MIPI_DSI_FMT_RGB888;
>> +	dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
>MIPI_DSI_MODE_VIDEO_SYNC_PULSE;
>> +
>> +	drm_panel_init(&ctx->panel, &dsi->dev, &xbd599_drm_funcs,
>> +		       DRM_MODE_CONNECTOR_DSI);
>> +
>> +	ret = drm_panel_of_backlight(&ctx->panel);
>> +	if (ret)
>> +		return ret;
>> +
>> +	drm_panel_add(&ctx->panel);
>> +
>> +	ret = mipi_dsi_attach(dsi);
>> +	if (ret < 0) {
>> +		DRM_DEV_ERROR(dev, "mipi_dsi_attach failed. Is host ready?\n");
>> +		drm_panel_remove(&ctx->panel);
>> +		return ret;
>> +	}
>> +
>> +	DRM_DEV_INFO(dev, "%ux%u@%u %ubpp dsi %udl - ready\n",
>> +		     xbd599_default_mode.hdisplay,
>> +		     xbd599_default_mode.vdisplay,
>> +		     xbd599_default_mode.vrefresh,
>> +		     mipi_dsi_pixel_format_to_bpp(dsi->format), dsi->lanes);
>> +
>> +	return 0;
>> +}
>> +
>> +static void xbd599_shutdown(struct mipi_dsi_device *dsi)
>> +{
>> +	struct xbd599 *ctx = mipi_dsi_get_drvdata(dsi);
>> +	int ret;
>> +
>> +	ret = xbd599_unprepare(&ctx->panel);
>
>Use drm_panel_unprepare().
>There may be, or may come functionality in drm_panel that is required.
>
>> +	if (ret < 0)
>> +		DRM_DEV_ERROR(&dsi->dev, "Failed to unprepare panel: %d\n",
>> +			      ret);
>> +}
>> +
>> +static int xbd599_remove(struct mipi_dsi_device *dsi)
>> +{
>> +	struct xbd599 *ctx = mipi_dsi_get_drvdata(dsi);
>> +	int ret;
>> +
>> +	xbd599_shutdown(dsi);
>> +
>> +	ret = mipi_dsi_detach(dsi);
>> +	if (ret < 0)
>> +		DRM_DEV_ERROR(&dsi->dev, "Failed to detach from DSI host: %d\n",
>> +			      ret);
>> +
>> +	drm_panel_remove(&ctx->panel);
>> +
>> +	return 0;
>> +}
>> +
>> +static const struct of_device_id xbd599_of_match[] = {
>> +	{ .compatible = "xingbangda,xbd599", },
>> +	{ /* sentinel */ }
>> +};
>> +MODULE_DEVICE_TABLE(of, xbd599_of_match);
>> +
>> +static struct mipi_dsi_driver xbd599_driver = {
>> +	.probe	= xbd599_probe,
>> +	.remove = xbd599_remove,
>> +	.shutdown = xbd599_shutdown,
>> +	.driver = {
>> +		.name = DRV_NAME,
>> +		.of_match_table = xbd599_of_match,
>> +	},
>> +};
>> +module_mipi_dsi_driver(xbd599_driver);
>> +
>> +MODULE_AUTHOR("Icenowy Zheng <icenowy@aosc.io>");
>> +MODULE_DESCRIPTION("DRM driver for Xingbangda XBD599 MIPI DSI
>panel");
>> +MODULE_LICENSE("GPL v2");
>> -- 
>> 2.24.1

-- 
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Re: [PATCH 3/5] drm: panel: add Xingbangda XBD599 panel

[Sam Ravnborg]

Hi Icenowy

> >> +++ b/drivers/gpu/drm/panel/panel-xingbangda-xbd599.c
> >> @@ -0,0 +1,367 @@
> >> +// SPDX-License-Identifier: GPL-2.0
> >> +/*
> >> + * Xingbangda XBD599 MIPI-DSI panel driver
> >> + *
> >> + * Copyright (C) 2019 Icenowy Zheng <icenowy@aosc.io>
> >2020?
> 
> The work started at Mid 2019.
> 
> Is 2019-2020 okay?

We see this in other places so I guess it is. The point
here is that the driver contains work from 2020 so you should at least
specify 2020.

	Sam