[PATCH 1/2] drm: panel: Add Samsung s6e63m0 panel documentation

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* [PATCH 1/2] drm: panel: Add Samsung s6e63m0 panel documentation
@ 2019-01-25 16:46 Paweł Chmiel
  2019-01-25 16:46 ` [PATCH 2/2] drm/panel: Add driver for Samsung S6E63M0 panel Paweł Chmiel
  2019-01-26 20:55 ` [PATCH 1/2] drm: panel: Add Samsung s6e63m0 panel documentation Sam Ravnborg
  0 siblings, 2 replies; 7+ messages in thread
From: Paweł Chmiel @ 2019-01-25 16:46 UTC (permalink / raw)
  To: thierry.reding
  Cc: airlied, daniel, robh+dt, mark.rutland, m.szyprowski, krzk,
	dri-devel, devicetree, linux-kernel, Jonathan Bakker,
	Paweł Chmiel

From: Jonathan Bakker <xc-racer2@live.ca>

This commit adds documentation for Samsung s6e63m0 AMOLED LCD panel
driver.

Signed-off-by: Jonathan Bakker <xc-racer2@live.ca>
Signed-off-by: Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>
---
 .../display/panel/samsung,s6e63m0.txt         | 60 +++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/panel/samsung,s6e63m0.txt

diff --git a/Documentation/devicetree/bindings/display/panel/samsung,s6e63m0.txt b/Documentation/devicetree/bindings/display/panel/samsung,s6e63m0.txt
new file mode 100644
index 000000000000..4979200e2dd2
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/panel/samsung,s6e63m0.txt
@@ -0,0 +1,60 @@
+Samsung s6e63m0 AMOLED LCD panel
+
+Required properties:
+  - compatible: "samsung,s6e63m0"
+  - reset-gpio: GPIO spec for reset pin
+  - vdd3-supply: VDD regulator
+  - vci-supply: VCI regulator
+  - display-timings: timings for the connected panel as described by [1]
+
+Optional properties:
+  - reset-delay: Delay in ms after adjusting reset-gpio, default 120ms
+  - power-on-delay: Delay in ms after powering on, default 25ms
+  - power-off-delay: Delay in ms before powering off, default 200ms
+  - panel-width-mm: physical panel width in mm
+  - panel-height-mm: physical panel height in mm
+
+The device node can contain one 'port' child node with one child
+'endpoint' node, according to the bindings defined in [2]. This
+node should describe panel's video bus.
+
+[1]: Documentation/devicetree/bindings/display/panel/display-timing.txt
+[2]: Documentation/devicetree/bindings/media/video-interfaces.txt
+
+Example:
+
+		s6e63m0: display@0 {
+			compatible = "samsung,s6e63m0";
+			reg = <0>;
+			reset-gpio = <&mp05 5 1>;
+			vdd3-supply = <&ldo12_reg>;
+			vci-supply = <&ldo11_reg>;
+			spi-max-frequency = <1000000>;
+
+			power-on-delay = <0>;
+			power-off-delay = <0>;
+			reset-delay = <10>;
+			panel-width-mm = <53>;
+			panel-height-mm = <89>;
+
+			display-timings {
+				timing-0 {
+					/* 480x800@60Hz */
+					clock-frequency = <25628040>;
+					hactive = <480>;
+					vactive = <800>;
+					hfront-porch = <16>;
+					hback-porch = <16>;
+					hsync-len = <2>;
+					vfront-porch = <28>;
+					vback-porch = <1>;
+					vsync-len = <2>;
+				};
+			};
+
+			port {
+				lcd_ep: endpoint {
+					remote-endpoint = <&fimd_ep>;
+				};
+			};
+		};
-- 
2.17.1


^ permalink raw reply related	[flat|nested] 7+ messages in thread

* [PATCH 2/2] drm/panel: Add driver for Samsung S6E63M0 panel
  2019-01-25 16:46 [PATCH 1/2] drm: panel: Add Samsung s6e63m0 panel documentation Paweł Chmiel
@ 2019-01-25 16:46 ` Paweł Chmiel
  2019-01-26 21:41   ` Sam Ravnborg
  2019-01-28 13:47   ` Andrzej Hajda
  2019-01-26 20:55 ` [PATCH 1/2] drm: panel: Add Samsung s6e63m0 panel documentation Sam Ravnborg
  1 sibling, 2 replies; 7+ messages in thread
From: Paweł Chmiel @ 2019-01-25 16:46 UTC (permalink / raw)
  To: thierry.reding
  Cc: airlied, daniel, robh+dt, mark.rutland, m.szyprowski, krzk,
	dri-devel, devicetree, linux-kernel, Paweł Chmiel

This patch adds Samsung S6E63M0 AMOLED LCD panel driver, connected over
spi. It's based on already removed, non dt s6e63m0 driver and
panel-samsung-ld9040. There is possibility to choose one from 3
different gamma tables.
It can be found for example in some of Samsung Aries based phones.

Signed-off-by: Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>
---
 drivers/gpu/drm/panel/Kconfig                 |   7 +
 drivers/gpu/drm/panel/Makefile                |   1 +
 drivers/gpu/drm/panel/panel-samsung-s6e63m0.c | 712 ++++++++++++++++++
 3 files changed, 720 insertions(+)
 create mode 100644 drivers/gpu/drm/panel/panel-samsung-s6e63m0.c

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 3f3537719beb..4a4b64f74e70 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -82,6 +82,13 @@ config DRM_PANEL_SAMSUNG_LD9040
 	depends on OF && SPI
 	select VIDEOMODE_HELPERS
 
+config DRM_PANEL_SAMSUNG_S6E63M0
+	tristate "Samsung S6E63M0 RGB/SPI panel"
+	depends on OF
+	depends on SPI
+	depends on BACKLIGHT_CLASS_DEVICE
+	select VIDEOMODE_HELPERS
+
 config DRM_PANEL_LG_LG4573
 	tristate "LG4573 RGB/SPI panel"
 	depends on OF && SPI
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index 4396658a7996..3e5d53fdee47 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_DRM_PANEL_RASPBERRYPI_TOUCHSCREEN) += panel-raspberrypi-touchscreen
 obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM68200) += panel-raydium-rm68200.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_LD9040) += panel-samsung-ld9040.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6D16D0) += panel-samsung-s6d16d0.o
+obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E63M0) += panel-samsung-s6e63m0.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E3HA2) += panel-samsung-s6e3ha2.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E63J0X03) += panel-samsung-s6e63j0x03.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E8AA0) += panel-samsung-s6e8aa0.o
diff --git a/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c b/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c
new file mode 100644
index 000000000000..cb5c090621ad
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c
@@ -0,0 +1,712 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * S6E63M0 AMOLED LCD drm_panel driver.
+ *
+ * Copyright (C) 2019 Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>
+ * Derived from drivers/gpu/drm/panel-samsung-ld9040.c
+ *
+ * Andrzej Hajda <a.hajda@samsung.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <drm/drmP.h>
+#include <drm/drm_panel.h>
+
+#include <linux/backlight.h>
+#include <linux/gpio/consumer.h>
+#include <linux/regulator/consumer.h>
+#include <linux/spi/spi.h>
+
+#include <video/mipi_display.h>
+#include <video/of_videomode.h>
+#include <video/videomode.h>
+
+/* Manufacturer Command Set */
+#define MCS_STAND_BY_OFF                0x11
+#define MCS_DISPLAY_ON                  0x29
+#define MCS_ELVSS_ON                0xb1
+#define MCS_ACL_CTRL                0xc0
+#define MCS_DISPLAY_CONDITION   0xf2
+#define MCS_ETC_CONDITION           0xf6
+#define MCS_PANEL_CONDITION         0xF8
+#define MCS_GAMMA_CTRL              0xfa
+
+#define MAX_GAMMA_LEVEL             11
+#define GAMMA_TABLE_COUNT           23
+
+#define MAX_BRIGHTNESS              (MAX_GAMMA_LEVEL - 1)
+#define GAMMA_MODE_22               0
+#define GAMMA_MODE_19               1
+#define GAMMA_MODE_17               2
+
+/* array of gamma tables for gamma value 2.2 */
+static u8 const s6e63m0_gamma_22[MAX_GAMMA_LEVEL][GAMMA_TABLE_COUNT] = {
+	{ MCS_GAMMA_CTRL, 0x00,
+	  0x18, 0x08, 0x24, 0x78, 0xEC, 0x3D, 0xC8,
+	  0xC2, 0xB6, 0xC4, 0xC7, 0xB6, 0xD5, 0xD7,
+	  0xCC, 0x00, 0x39, 0x00, 0x36, 0x00, 0x51 },
+	{ MCS_GAMMA_CTRL, 0x00,
+	  0x18, 0x08, 0x24, 0x73, 0x4A, 0x3D, 0xC0,
+	  0xC2, 0xB1, 0xBB, 0xBE, 0xAC, 0xCE, 0xCF,
+	  0xC5, 0x00, 0x5D, 0x00, 0x5E, 0x00, 0x82 },
+	{ MCS_GAMMA_CTRL, 0x00,
+	  0x18, 0x08, 0x24, 0x70, 0x51, 0x3E, 0xBF,
+	  0xC1, 0xAF, 0xB9, 0xBC, 0xAB, 0xCC, 0xCC,
+	  0xC2, 0x00, 0x65, 0x00, 0x67, 0x00, 0x8D },
+	{ MCS_GAMMA_CTRL, 0x00,
+	  0x18, 0x08, 0x24, 0x6C, 0x54, 0x3A, 0xBC,
+	  0xBF, 0xAC, 0xB7, 0xBB, 0xA9, 0xC9, 0xC9,
+	  0xBE, 0x00, 0x71, 0x00, 0x73, 0x00, 0x9E },
+	{ MCS_GAMMA_CTRL, 0x00,
+	  0x18, 0x08, 0x24, 0x69, 0x54, 0x37, 0xBB,
+	  0xBE, 0xAC, 0xB4, 0xB7, 0xA6, 0xC7, 0xC8,
+	  0xBC, 0x00, 0x7B, 0x00, 0x7E, 0x00, 0xAB },
+	{ MCS_GAMMA_CTRL, 0x00,
+	  0x18, 0x08, 0x24, 0x66, 0x55, 0x34, 0xBA,
+	  0xBD, 0xAB, 0xB1, 0xB5, 0xA3, 0xC5, 0xC6,
+	  0xB9, 0x00, 0x85, 0x00, 0x88, 0x00, 0xBA },
+	{ MCS_GAMMA_CTRL, 0x00,
+	  0x18, 0x08, 0x24, 0x63, 0x53, 0x31, 0xB8,
+	  0xBC, 0xA9, 0xB0, 0xB5, 0xA2, 0xC4, 0xC4,
+	  0xB8, 0x00, 0x8B, 0x00, 0x8E, 0x00, 0xC2 },
+	{ MCS_GAMMA_CTRL, 0x00,
+	  0x18, 0x08, 0x24, 0x62, 0x54, 0x30, 0xB9,
+	  0xBB, 0xA9, 0xB0, 0xB3, 0xA1, 0xC1, 0xC3,
+	  0xB7, 0x00, 0x91, 0x00, 0x95, 0x00, 0xDA },
+	{ MCS_GAMMA_CTRL, 0x00,
+	  0x18, 0x08, 0x24, 0x66, 0x58, 0x34, 0xB6,
+	  0xBA, 0xA7, 0xAF, 0xB3, 0xA0, 0xC1, 0xC2,
+	  0xB7, 0x00, 0x97, 0x00, 0x9A, 0x00, 0xD1 },
+	{ MCS_GAMMA_CTRL, 0x00,
+	  0x18, 0x08, 0x24, 0x64, 0x56, 0x33, 0xB6,
+	  0xBA, 0xA8, 0xAC, 0xB1, 0x9D, 0xC1, 0xC1,
+	  0xB7, 0x00, 0x9C, 0x00, 0x9F, 0x00, 0xD6 },
+	{ MCS_GAMMA_CTRL, 0x00,
+	  0x18, 0x08, 0x24, 0x5f, 0x50, 0x2d, 0xB6,
+	  0xB9, 0xA7, 0xAd, 0xB1, 0x9f, 0xbe, 0xC0,
+	  0xB5, 0x00, 0xa0, 0x00, 0xa4, 0x00, 0xdb },
+};
+
+/* array of gamma tables for gamma value 1.9 */
+static u8 const s6e63m0_gamma_19[MAX_GAMMA_LEVEL][GAMMA_TABLE_COUNT] = {
+	{ MCS_GAMMA_CTRL, 0x00,
+	  0x18, 0x08, 0x24, 0x84, 0x45, 0x4F, 0xCA,
+	  0xCB, 0xBC, 0xC9, 0xCB, 0xBC, 0xDA, 0xDA,
+	  0xD0, 0x00, 0x35, 0x00, 0x34, 0x00, 0x4E },
+	{ MCS_GAMMA_CTRL, 0x00,
+	  0x18, 0x08, 0x24, 0x74, 0x60, 0x4A, 0xC3,
+	  0xC6, 0xB5, 0xBF, 0xC3, 0xB2, 0xD2, 0xD3,
+	  0xC8, 0x00, 0x5B, 0x00, 0x5B, 0x00, 0x81 },
+	{ MCS_GAMMA_CTRL, 0x00,
+	  0x18, 0x08, 0x24, 0x6F, 0x65, 0x46, 0xC2,
+	  0xC4, 0xB3, 0xBF, 0xC2, 0xB2, 0xCF, 0xD1,
+	  0xC6, 0x00, 0x64, 0x00, 0x64, 0x00, 0x8D },
+	{ MCS_GAMMA_CTRL, 0x00,
+	  0x18, 0x08, 0x24, 0x6E, 0x65, 0x45, 0xC0,
+	  0xC3, 0xB2, 0xBA, 0xBE, 0xAE, 0xCD, 0xD0,
+	  0xC4, 0x00, 0x70, 0x00, 0x70, 0x00, 0x9C },
+	{ MCS_GAMMA_CTRL, 0x00,
+	  0x18, 0x08, 0x24, 0x69, 0x64, 0x40, 0xBF,
+	  0xC1, 0xB0, 0xB9, 0xBE, 0xAD, 0xCB, 0xCD,
+	  0xC2, 0x00, 0x7A, 0x00, 0x7B, 0x00, 0xAA },
+	{ MCS_GAMMA_CTRL, 0x00,
+	  0x18, 0x08, 0x24, 0x68, 0x64, 0x3F, 0xBE,
+	  0xC0, 0xB0, 0xB6, 0xBB, 0xAB, 0xC8, 0xCB,
+	  0xBF, 0x00, 0x85, 0x00, 0x86, 0x00, 0xB8 },
+	{ MCS_GAMMA_CTRL, 0x00,
+	  0x18, 0x08, 0x24, 0x68, 0x64, 0x40, 0xBC,
+	  0xBF, 0xAF, 0xB4, 0xBA, 0xA9, 0xC8, 0xCA,
+	  0xBE, 0x00, 0x8B, 0x00, 0x8C, 0x00, 0xC0 },
+	{ MCS_GAMMA_CTRL, 0x00,
+	  0x18, 0x08, 0x24, 0x67, 0x64, 0x3F, 0xBB,
+	  0xBE, 0xAD, 0xB3, 0xB9, 0xA7, 0xC8, 0xC9,
+	  0xBE, 0x00, 0x90, 0x00, 0x92, 0x00, 0xC8 },
+	{ MCS_GAMMA_CTRL, 0x00,
+	  0x18, 0x08, 0x24, 0x63, 0x61, 0x3B, 0xBA,
+	  0xBE, 0xAC, 0xB3, 0xB8, 0xA7, 0xC6, 0xC8,
+	  0xBD, 0x00, 0x96, 0x00, 0x98, 0x00, 0xCF },
+	{ MCS_GAMMA_CTRL, 0x00,
+	  0x18, 0x08, 0x24, 0x61, 0x60, 0x39, 0xBB,
+	  0xBE, 0xAD, 0xB2, 0xB6, 0xA6, 0xC5, 0xC7,
+	  0xBD, 0x00, 0x9B, 0x00, 0x9E, 0x00, 0xD5 },
+	{ MCS_GAMMA_CTRL, 0x00,
+	  0x18, 0x08, 0x24, 0x61, 0x5F, 0x39, 0xBA,
+	  0xBD, 0xAD, 0xB1, 0xB6, 0xA5, 0xC4, 0xC5,
+	  0xBC, 0x00, 0xA0, 0x00, 0xA4, 0x00, 0xDB },
+};
+
+/* array of gamma tables for gamma value 1.7 */
+static u8 const s6e63m0_gamma_17[MAX_GAMMA_LEVEL][GAMMA_TABLE_COUNT] = {
+	{ MCS_GAMMA_CTRL, 0x00,
+	  0x18, 0x08, 0x24, 0x8F, 0x73, 0x63, 0xD1,
+	  0xD0, 0xC5, 0xCC, 0xD1, 0xC2, 0xDE, 0xE0,
+	  0xD6, 0x00, 0x39, 0x00, 0x36, 0x00, 0x51 },
+	{ MCS_GAMMA_CTRL, 0x00,
+	  0x18, 0x08, 0x24, 0x82, 0x7A, 0x5B, 0xC8,
+	  0xCB, 0xBD, 0xC5, 0xCA, 0xBA, 0xD6, 0xD8,
+	  0xCE, 0x00, 0x5D, 0x00, 0x5E, 0x00, 0x82 },
+	{ MCS_GAMMA_CTRL, 0x00,
+	  0x18, 0x08, 0x24, 0x81, 0x7B, 0x5D, 0xC6,
+	  0xCA, 0xBB, 0xC3, 0xC7, 0xB8, 0xD6, 0xD8,
+	  0xCD, 0x00, 0x65, 0x00, 0x67, 0x00, 0x8D },
+	{ MCS_GAMMA_CTRL, 0x00,
+	  0x18, 0x08, 0x24, 0x7B, 0x77, 0x58, 0xC3,
+	  0xC8, 0xB8, 0xC2, 0xC6, 0xB6, 0xD3, 0xD4,
+	  0xCA, 0x00, 0x71, 0x00, 0x73, 0x00, 0x9E },
+	{ MCS_GAMMA_CTRL, 0x00,
+	  0x18, 0x08, 0x24, 0x75, 0x77, 0x54, 0xC3,
+	  0xC7, 0xB7, 0xC0, 0xC3, 0xB4, 0xD1, 0xD3,
+	  0xC9, 0x00, 0x7B, 0x00, 0x7E, 0x00, 0xAB },
+	{ MCS_GAMMA_CTRL, 0x00,
+	  0x18, 0x08, 0x24, 0x72, 0x75, 0x51, 0xC2,
+	  0xC6, 0xB5, 0xBF, 0xC1, 0xB3, 0xCE, 0xD1,
+	  0xC6, 0x00, 0x85, 0x00, 0x88, 0x00, 0xBA },
+	{ MCS_GAMMA_CTRL, 0x00,
+	  0x18, 0x08, 0x24, 0x71, 0x73, 0x4F, 0xC2,
+	  0xC5, 0xB5, 0xBD, 0xC0, 0xB2, 0xCD, 0xD1,
+	  0xC5, 0x00, 0x8B, 0x00, 0x8E, 0x00, 0xC2 },
+	{ MCS_GAMMA_CTRL, 0x00,
+	  0x18, 0x08, 0x24, 0x71, 0x72, 0x4F, 0xC2,
+	  0xC4, 0xB5, 0xBB, 0xBF, 0xB0, 0xCC, 0xCF,
+	  0xC3, 0x00, 0x91, 0x00, 0x95, 0x00, 0xCA },
+	{ MCS_GAMMA_CTRL, 0x00,
+	  0x18, 0x08, 0x24, 0x72, 0x72, 0x50, 0xC0,
+	  0xC3, 0xB4, 0xB9, 0xBE, 0xAE, 0xCC, 0xCF,
+	  0xC4, 0x00, 0x97, 0x00, 0x9A, 0x00, 0xD1 },
+	{ MCS_GAMMA_CTRL, 0x00,
+	  0x18, 0x08, 0x24, 0x71, 0x71, 0x50, 0xBF,
+	  0xC2, 0xB2, 0xBA, 0xBE, 0xAE, 0xCB, 0xCD,
+	  0xC3, 0x00, 0x9C, 0x00, 0x9F, 0x00, 0xD6 },
+	{ MCS_GAMMA_CTRL, 0x00,
+	  0x18, 0x08, 0x24, 0x70, 0x70, 0x4F, 0xBF,
+	  0xC2, 0xB2, 0xB8, 0xBC, 0xAC, 0xCB, 0xCD,
+	  0xC3, 0x00, 0xA0, 0x00, 0xA4, 0x00, 0xDB },
+};
+
+#define S6E63M0_STATE_BIT_ENABLED       0
+
+struct s6e63m0 {
+	struct device *dev;
+	struct drm_panel panel;
+
+	struct regulator_bulk_data supplies[2];
+	struct gpio_desc *reset_gpio;
+	u32 power_on_delay;
+	u32 power_off_delay;
+	u32 reset_delay;
+	struct videomode vm;
+	u32 width_mm;
+	u32 height_mm;
+
+	unsigned long state;
+	unsigned int gamma_mode;
+	int brightness;
+
+	/* This field is tested by functions directly accessing bus before
+	 * transfer, transfer is skipped if it is set. In case of transfer
+	 * failure or unexpected response the field is set to error value.
+	 * Such construct allows to eliminate many checks in higher level
+	 * functions.
+	 */
+	int error;
+};
+
+static inline struct s6e63m0 *panel_to_s6e63m0(struct drm_panel *panel)
+{
+	return container_of(panel, struct s6e63m0, panel);
+}
+
+static int s6e63m0_clear_error(struct s6e63m0 *ctx)
+{
+	int ret = ctx->error;
+
+	ctx->error = 0;
+	return ret;
+}
+
+static int s6e63m0_spi_write_word(struct s6e63m0 *ctx, u16 data)
+{
+	struct spi_device *spi = to_spi_device(ctx->dev);
+	struct spi_transfer xfer = {
+		.len	= 2,
+		.tx_buf = &data,
+	};
+	struct spi_message msg;
+
+	spi_message_init(&msg);
+	spi_message_add_tail(&xfer, &msg);
+
+	return spi_sync(spi, &msg);
+}
+
+static void s6e63m0_dcs_write(struct s6e63m0 *ctx, const u8 *data, size_t len)
+{
+	int ret = 0;
+
+	if (ctx->error < 0 || len == 0)
+		return;
+
+	dev_dbg(ctx->dev, "writing dcs seq: %*ph\n", (int)len, data);
+	ret = s6e63m0_spi_write_word(ctx, *data);
+
+	while (!ret && --len) {
+		++data;
+		ret = s6e63m0_spi_write_word(ctx, *data | 0x100);
+	}
+
+	if (ret) {
+		dev_err(ctx->dev, "error %d writing dcs seq: %*ph\n", ret,
+			(int)len, data);
+		ctx->error = ret;
+	}
+
+	usleep_range(300, 310);
+}
+
+#define s6e63m0_dcs_write_seq_static(ctx, seq ...) \
+	({ \
+		static const u8 d[] = { seq }; \
+		s6e63m0_dcs_write(ctx, d, ARRAY_SIZE(d)); \
+	})
+
+static void s6e63m0_brightness_set(struct s6e63m0 *ctx)
+{
+	/* disable and set new gamma */
+	switch (ctx->gamma_mode) {
+	case GAMMA_MODE_22:
+		s6e63m0_dcs_write(ctx,
+				  s6e63m0_gamma_22[ctx->brightness],
+				  ARRAY_SIZE(s6e63m0_gamma_22[ctx->brightness])
+				  );
+		break;
+	case GAMMA_MODE_19:
+		s6e63m0_dcs_write(ctx,
+				  s6e63m0_gamma_19[ctx->brightness],
+				  ARRAY_SIZE(s6e63m0_gamma_19[ctx->brightness])
+				  );
+		break;
+	case GAMMA_MODE_17:
+		s6e63m0_dcs_write(ctx,
+				  s6e63m0_gamma_17[ctx->brightness],
+				  ARRAY_SIZE(s6e63m0_gamma_17[ctx->brightness])
+				  );
+		break;
+	default:
+		dev_info(ctx->dev,
+			 "gamma mode could be 0:2.2, 1:1.9 or 2:1.7.Assuming 2.2\n"
+			 );
+		s6e63m0_dcs_write(ctx,
+				  s6e63m0_gamma_22[ctx->brightness],
+				  ARRAY_SIZE(s6e63m0_gamma_22[ctx->brightness])
+				  );
+		break;
+	}
+
+	/* update gamma table. */
+	s6e63m0_dcs_write_seq_static(ctx, MCS_GAMMA_CTRL, 0x01);
+}
+
+static void s6e63m0_init(struct s6e63m0 *ctx)
+{
+	s6e63m0_dcs_write_seq_static(ctx, MCS_PANEL_CONDITION,
+				     0x01, 0x27, 0x27, 0x07, 0x07, 0x54, 0x9f,
+				     0x63, 0x86, 0x1a, 0x33, 0x0d, 0x00, 0x00);
+
+	s6e63m0_dcs_write_seq_static(ctx, MCS_DISPLAY_CONDITION,
+				     0x02, 0x03, 0x1c, 0x10, 0x10);
+	s6e63m0_dcs_write_seq_static(ctx, 0xf7,
+				     0x03, 0x00, 0x00);
+
+	s6e63m0_dcs_write_seq_static(ctx, MCS_GAMMA_CTRL,
+				     0x00, 0x18, 0x08, 0x24, 0x64, 0x56, 0x33,
+				     0xb6, 0xba, 0xa8, 0xac, 0xb1, 0x9d, 0xc1,
+				     0xc1, 0xb7, 0x00, 0x9c, 0x00, 0x9f, 0x00,
+				     0xd6);
+	s6e63m0_dcs_write_seq_static(ctx, MCS_GAMMA_CTRL,
+				     0x01);
+
+	s6e63m0_dcs_write_seq_static(ctx, MCS_ETC_CONDITION,
+				     0x00, 0x8c, 0x07);
+	s6e63m0_dcs_write_seq_static(ctx, 0xb3,
+				     0xc);
+
+	s6e63m0_dcs_write_seq_static(ctx, 0xb5,
+				     0x2c, 0x12, 0x0c, 0x0a, 0x10, 0x0e, 0x17,
+				     0x13, 0x1f, 0x1a, 0x2a, 0x24, 0x1f, 0x1b,
+				     0x1a, 0x17, 0x2b, 0x26, 0x22, 0x20, 0x3a,
+				     0x34, 0x30, 0x2c, 0x29, 0x26, 0x25, 0x23,
+				     0x21, 0x20, 0x1e, 0x1e);
+
+	s6e63m0_dcs_write_seq_static(ctx, 0xb6,
+				     0x00, 0x00, 0x11, 0x22, 0x33, 0x44, 0x44,
+				     0x44, 0x55, 0x55, 0x66, 0x66, 0x66, 0x66,
+				     0x66, 0x66);
+
+	s6e63m0_dcs_write_seq_static(ctx, 0xb7,
+				     0x2c, 0x12, 0x0c, 0x0a, 0x10, 0x0e, 0x17,
+				     0x13, 0x1f, 0x1a, 0x2a, 0x24, 0x1f, 0x1b,
+				     0x1a, 0x17, 0x2b, 0x26, 0x22, 0x20, 0x3a,
+				     0x34, 0x30, 0x2c, 0x29, 0x26, 0x25, 0x23,
+				     0x21, 0x20, 0x1e, 0x1e, 0x00, 0x00, 0x11,
+				     0x22, 0x33, 0x44, 0x44, 0x44, 0x55, 0x55,
+				     0x66, 0x66, 0x66, 0x66, 0x66, 0x66);
+
+	s6e63m0_dcs_write_seq_static(ctx, 0xb9,
+				     0x2c, 0x12, 0x0c, 0x0a, 0x10, 0x0e, 0x17,
+				     0x13, 0x1f, 0x1a, 0x2a, 0x24, 0x1f, 0x1b,
+				     0x1a, 0x17, 0x2b, 0x26, 0x22, 0x20, 0x3a,
+				     0x34, 0x30, 0x2c, 0x29, 0x26, 0x25, 0x23,
+				     0x21, 0x20, 0x1e, 0x1e);
+
+	s6e63m0_dcs_write_seq_static(ctx, 0xba,
+				     0x00, 0x00, 0x11, 0x22, 0x33, 0x44, 0x44,
+				     0x44, 0x55, 0x55, 0x66, 0x66, 0x66, 0x66,
+				     0x66, 0x66);
+
+	s6e63m0_dcs_write_seq_static(ctx, 0xc1,
+				     0x4d, 0x96, 0x1d, 0x00, 0x00, 0x01, 0xdf,
+				     0x00, 0x00, 0x03, 0x1f, 0x00, 0x00, 0x00,
+				     0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x06,
+				     0x09, 0x0d, 0x0f, 0x12, 0x15, 0x18);
+
+	s6e63m0_dcs_write_seq_static(ctx, 0xb2,
+				     0x10, 0x10, 0x0b, 0x05);
+
+	s6e63m0_dcs_write_seq_static(ctx, MCS_ACL_CTRL,
+				     0x01);
+
+	s6e63m0_dcs_write_seq_static(ctx, MCS_ELVSS_ON,
+				     0x0b);
+
+	s6e63m0_dcs_write_seq_static(ctx, MCS_STAND_BY_OFF);
+
+	s6e63m0_dcs_write_seq_static(ctx, MCS_DISPLAY_ON);
+
+	s6e63m0_brightness_set(ctx);
+}
+
+static int s6e63m0_power_on(struct s6e63m0 *ctx)
+{
+	int ret;
+
+	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+	if (ret < 0)
+		return ret;
+
+	msleep(ctx->power_on_delay);
+
+	gpiod_set_value(ctx->reset_gpio, 1);
+	msleep(ctx->reset_delay);
+	gpiod_set_value(ctx->reset_gpio, 0);
+	msleep(ctx->reset_delay);
+
+	return 0;
+}
+
+static int s6e63m0_power_off(struct s6e63m0 *ctx)
+{
+	msleep(ctx->power_off_delay);
+
+	return regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+}
+
+static int s6e63m0_disable(struct drm_panel *panel)
+{
+	return 0;
+}
+
+static int s6e63m0_unprepare(struct drm_panel *panel)
+{
+	struct s6e63m0 *ctx = panel_to_s6e63m0(panel);
+
+	clear_bit(S6E63M0_STATE_BIT_ENABLED, &ctx->state);
+
+	s6e63m0_dcs_write_seq_static(ctx, MIPI_DCS_ENTER_SLEEP_MODE);
+
+	s6e63m0_clear_error(ctx);
+
+	return s6e63m0_power_off(ctx);
+}
+
+static int s6e63m0_prepare(struct drm_panel *panel)
+{
+	struct s6e63m0 *ctx = panel_to_s6e63m0(panel);
+	int ret;
+
+	ret = s6e63m0_power_on(ctx);
+	if (ret < 0)
+		return ret;
+
+	s6e63m0_init(ctx);
+
+	ret = s6e63m0_clear_error(ctx);
+
+	if (ret < 0)
+		s6e63m0_unprepare(panel);
+	else
+		set_bit(S6E63M0_STATE_BIT_ENABLED, &ctx->state);
+
+	return ret;
+}
+
+static int s6e63m0_enable(struct drm_panel *panel)
+{
+	return 0;
+}
+
+static int s6e63m0_get_modes(struct drm_panel *panel)
+{
+	struct drm_connector *connector = panel->connector;
+	struct s6e63m0 *ctx = panel_to_s6e63m0(panel);
+	struct drm_display_mode *mode;
+
+	mode = drm_mode_create(connector->dev);
+	if (!mode) {
+		DRM_ERROR("failed to create a new display mode\n");
+		return 0;
+	}
+
+	drm_display_mode_from_videomode(&ctx->vm, mode);
+	mode->width_mm = ctx->width_mm;
+	mode->height_mm = ctx->height_mm;
+	connector->display_info.width_mm = mode->width_mm;
+	connector->display_info.height_mm = mode->height_mm;
+
+	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
+	mode->flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC;
+	drm_mode_probed_add(connector, mode);
+
+	return 1;
+}
+
+static const struct drm_panel_funcs s6e63m0_drm_funcs = {
+	.disable	= s6e63m0_disable,
+	.unprepare	= s6e63m0_unprepare,
+	.prepare	= s6e63m0_prepare,
+	.enable		= s6e63m0_enable,
+	.get_modes	= s6e63m0_get_modes,
+};
+
+static int s6e63m0_get_brightness(struct backlight_device *bd)
+{
+	return bd->props.brightness;
+}
+
+static int s6e63m0_set_brightness(struct backlight_device *bd)
+{
+	struct s6e63m0 *ctx = bl_get_data(bd);
+
+	bd->props.power = FB_BLANK_UNBLANK;
+	if (ctx->brightness != bd->props.brightness) {
+		ctx->brightness = bd->props.brightness;
+		if (test_bit(S6E63M0_STATE_BIT_ENABLED, &ctx->state))
+			s6e63m0_brightness_set(ctx);
+	}
+
+	return s6e63m0_clear_error(ctx);
+}
+
+static const struct backlight_ops s6e63m0_backlight_ops = {
+	.get_brightness = s6e63m0_get_brightness,
+	.update_status	= s6e63m0_set_brightness,
+};
+
+static void s6e63m0_backlight_register(struct s6e63m0 *ctx)
+{
+	struct backlight_properties props = {
+		.type		= BACKLIGHT_RAW,
+		.brightness	= ctx->brightness,
+		.max_brightness = MAX_BRIGHTNESS
+	};
+	struct device *dev = ctx->dev;
+	struct backlight_device *bd;
+
+	bd = devm_backlight_device_register(dev, "panel", dev, ctx,
+					    &s6e63m0_backlight_ops, &props);
+	if (IS_ERR(bd))
+		dev_err(dev, "error registering backlight device (%ld)\n",
+			PTR_ERR(bd));
+}
+
+
+static ssize_t s6e63m0_sysfs_gamma_mode_show(struct device *dev,
+					     struct device_attribute *attr,
+					     char *buf)
+{
+	struct s6e63m0 *ctx = dev_get_drvdata(dev);
+	char temp[10];
+
+	switch (ctx->gamma_mode) {
+	case GAMMA_MODE_22:
+		sprintf(temp, "2.2 mode\n");
+		strcat(buf, temp);
+		break;
+	case GAMMA_MODE_19:
+		sprintf(temp, "1.9 mode\n");
+		strcat(buf, temp);
+		break;
+	case GAMMA_MODE_17:
+		sprintf(temp, "1.7 mode\n");
+		strcat(buf, temp);
+		break;
+	default:
+		dev_info(dev, "gamma mode could be 0:2.2, 1:1.9 or 2:1.7)n");
+		break;
+	}
+
+	return strlen(buf);
+}
+
+static ssize_t s6e63m0_sysfs_gamma_mode_store(struct device *dev,
+					      struct device_attribute *attr,
+					      const char *buf, size_t len)
+{
+	struct s6e63m0 *ctx = dev_get_drvdata(dev);
+	int rc;
+
+	rc = kstrtouint(buf, 0, &ctx->gamma_mode);
+	if (rc < 0)
+		return rc;
+
+	s6e63m0_brightness_set(ctx);
+	return len;
+}
+
+static DEVICE_ATTR(gamma_mode, 0644,
+		   s6e63m0_sysfs_gamma_mode_show,
+		   s6e63m0_sysfs_gamma_mode_store);
+
+static int s6e63m0_parse_dt(struct s6e63m0 *ctx)
+{
+	struct device *dev = ctx->dev;
+	struct device_node *np = dev->of_node;
+	int ret;
+
+	ret = of_get_videomode(np, &ctx->vm, 0);
+	if (ret < 0)
+		return ret;
+
+	ret = of_property_read_u32(np, "power-on-delay", &ctx->power_on_delay);
+	if (ret) {
+		dev_info(ctx->dev, "using default power-on-delay of 25ms");
+		ctx->power_on_delay = 25;
+	}
+
+	ret = of_property_read_u32(np, "power-off-delay",
+				   &ctx->power_off_delay);
+	if (ret) {
+		dev_info(ctx->dev, "using default power-of-delay of 200ms");
+		ctx->power_off_delay = 200;
+	}
+
+	ret = of_property_read_u32(np, "reset-delay", &ctx->reset_delay);
+	if (ret) {
+		dev_info(ctx->dev, "using default reset-delay of 120ms");
+		ctx->reset_delay = 120;
+	}
+
+	of_property_read_u32(np, "panel-width-mm", &ctx->width_mm);
+	of_property_read_u32(np, "panel-height-mm", &ctx->height_mm);
+
+	return 0;
+}
+
+static int s6e63m0_probe(struct spi_device *spi)
+{
+	struct device *dev = &spi->dev;
+	struct s6e63m0 *ctx;
+	int ret;
+
+	ctx = devm_kzalloc(dev, sizeof(struct s6e63m0), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	spi_set_drvdata(spi, ctx);
+
+	ctx->dev = dev;
+	ctx->brightness = MAX_BRIGHTNESS;
+	ctx->gamma_mode = GAMMA_MODE_22;
+
+	ret = s6e63m0_parse_dt(ctx);
+	if (ret < 0)
+		return ret;
+
+	ctx->supplies[0].supply = "vdd3";
+	ctx->supplies[1].supply = "vci";
+	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
+				      ctx->supplies);
+	if (ret < 0) {
+		dev_err(dev, "failed to get regulators: %d\n", ret);
+		return ret;
+	}
+
+	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(ctx->reset_gpio)) {
+		dev_err(dev, "cannot get reset-gpios %ld\n",
+			PTR_ERR(ctx->reset_gpio));
+		return PTR_ERR(ctx->reset_gpio);
+	}
+
+	spi->bits_per_word = 9;
+	spi->mode = SPI_MODE_3;
+	ret = spi_setup(spi);
+	if (ret < 0) {
+		dev_err(dev, "spi setup failed.\n");
+		return ret;
+	}
+
+	ret = device_create_file(dev, &dev_attr_gamma_mode);
+	if (ret < 0)
+		dev_err(dev, "failed to add sysfs entries\n");
+
+	drm_panel_init(&ctx->panel);
+	ctx->panel.dev = dev;
+	ctx->panel.funcs = &s6e63m0_drm_funcs;
+
+	ret = drm_panel_add(&ctx->panel);
+	if (ret < 0)
+		goto err_remove_file;
+
+	s6e63m0_backlight_register(ctx);
+
+	return 0;
+
+err_remove_file:
+	device_remove_file(dev, &dev_attr_gamma_mode);
+
+	return ret;
+}
+
+static int s6e63m0_remove(struct spi_device *spi)
+{
+	struct s6e63m0 *ctx = spi_get_drvdata(spi);
+
+	s6e63m0_power_off(ctx);
+	drm_panel_remove(&ctx->panel);
+	device_remove_file(ctx->dev, &dev_attr_gamma_mode);
+
+	return 0;
+}
+
+static const struct of_device_id s6e63m0_of_match[] = {
+	{ .compatible = "samsung,s6e63m0" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, s6e63m0_of_match);
+
+static struct spi_driver s6e63m0_driver = {
+	.probe			= s6e63m0_probe,
+	.remove			= s6e63m0_remove,
+	.driver			= {
+		.name		= "panel-samsung-s6e63m0",
+		.of_match_table = s6e63m0_of_match,
+	},
+};
+module_spi_driver(s6e63m0_driver);
+
+MODULE_AUTHOR("Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>");
+MODULE_DESCRIPTION("s6e63m0 LCD Driver");
+MODULE_LICENSE("GPL v2");
-- 
2.17.1


^ permalink raw reply related	[flat|nested] 7+ messages in thread

* Re: [PATCH 2/2] drm/panel: Add driver for Samsung S6E63M0 panel
  2019-01-25 16:46 ` [PATCH 2/2] drm/panel: Add driver for Samsung S6E63M0 panel Paweł Chmiel
@ 2019-01-26 21:41   ` Sam Ravnborg
  2019-01-28 13:47   ` Andrzej Hajda
  1 sibling, 0 replies; 7+ messages in thread
From: Sam Ravnborg @ 2019-01-26 21:41 UTC (permalink / raw)
  To: Paweł Chmiel
  Cc: thierry.reding, mark.rutland, devicetree, airlied, linux-kernel,
	krzk, robh+dt, dri-devel, m.szyprowski

Hi Pawel.

Thanks for this nice patch too.

Comment follows and you need to judge what to follow.
The timing part will not be commented as this was covered in
feedback on the binding.

Using a sysfs file to select the gamma mode looks like a local hack.
Someone with more drm knowledge needs comment on that.


On Fri, Jan 25, 2019 at 05:46:45PM +0100, Paweł Chmiel wrote:
> This patch adds Samsung S6E63M0 AMOLED LCD panel driver, connected over
> spi. It's based on already removed, non dt s6e63m0 driver and
> panel-samsung-ld9040. There is possibility to choose one from 3
> different gamma tables.
> It can be found for example in some of Samsung Aries based phones.
> 
> Signed-off-by: Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>
> ---
>  drivers/gpu/drm/panel/Kconfig                 |   7 +
>  drivers/gpu/drm/panel/Makefile                |   1 +
>  drivers/gpu/drm/panel/panel-samsung-s6e63m0.c | 712 ++++++++++++++++++
>  3 files changed, 720 insertions(+)
>  create mode 100644 drivers/gpu/drm/panel/panel-samsung-s6e63m0.c
> 
> diff --git a/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c b/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c
> new file mode 100644
> index 000000000000..cb5c090621ad
> --- /dev/null
> +++ b/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c
> @@ -0,0 +1,712 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * S6E63M0 AMOLED LCD drm_panel driver.
> + *
> + * Copyright (C) 2019 Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>
> + * Derived from drivers/gpu/drm/panel-samsung-ld9040.c
> + *
> + * Andrzej Hajda <a.hajda@samsung.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.
> + */
> +
> +#include <drm/drmP.h>
> +#include <drm/drm_panel.h>
For new drivers please do not use drmP.h, we are working
on gettting rid of it.
The list is sorted in alphabetical order - good.
> +
> +#include <linux/backlight.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/spi/spi.h>
> +
> +#include <video/mipi_display.h>
> +#include <video/of_videomode.h>
> +#include <video/videomode.h>
> +
> +/* Manufacturer Command Set */
> +#define MCS_STAND_BY_OFF                0x11
> +#define MCS_DISPLAY_ON                  0x29
> +#define MCS_ELVSS_ON                0xb1
> +#define MCS_ACL_CTRL                0xc0
> +#define MCS_DISPLAY_CONDITION   0xf2
> +#define MCS_ETC_CONDITION           0xf6
> +#define MCS_PANEL_CONDITION         0xF8
> +#define MCS_GAMMA_CTRL              0xfa
> +
> +#define MAX_GAMMA_LEVEL             11
> +#define GAMMA_TABLE_COUNT           23
> +
> +#define MAX_BRIGHTNESS              (MAX_GAMMA_LEVEL - 1)
> +#define GAMMA_MODE_22               0
> +#define GAMMA_MODE_19               1
> +#define GAMMA_MODE_17               2
> +
> +/* array of gamma tables for gamma value 2.2 */
> +static u8 const s6e63m0_gamma_19[MAX_GAMMA_LEVEL][GAMMA_TABLE_COUNT] = {
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x84, 0x45, 0x4F, 0xCA,
> +	  0xCB, 0xBC, 0xC9, 0xCB, 0xBC, 0xDA, 0xDA,
> +	  0xD0, 0x00, 0x35, 0x00, 0x34, 0x00, 0x4E },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x74, 0x60, 0x4A, 0xC3,
> +	  0xC6, 0xB5, 0xBF, 0xC3, 0xB2, 0xD2, 0xD3,
> +	  0xC8, 0x00, 0x5B, 0x00, 0x5B, 0x00, 0x81 },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x6F, 0x65, 0x46, 0xC2,
> +	  0xC4, 0xB3, 0xBF, 0xC2, 0xB2, 0xCF, 0xD1,
> +	  0xC6, 0x00, 0x64, 0x00, 0x64, 0x00, 0x8D },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x6E, 0x65, 0x45, 0xC0,
> +	  0xC3, 0xB2, 0xBA, 0xBE, 0xAE, 0xCD, 0xD0,
> +	  0xC4, 0x00, 0x70, 0x00, 0x70, 0x00, 0x9C },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x69, 0x64, 0x40, 0xBF,
> +	  0xC1, 0xB0, 0xB9, 0xBE, 0xAD, 0xCB, 0xCD,
> +	  0xC2, 0x00, 0x7A, 0x00, 0x7B, 0x00, 0xAA },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x68, 0x64, 0x3F, 0xBE,
> +	  0xC0, 0xB0, 0xB6, 0xBB, 0xAB, 0xC8, 0xCB,
> +	  0xBF, 0x00, 0x85, 0x00, 0x86, 0x00, 0xB8 },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x68, 0x64, 0x40, 0xBC,
> +	  0xBF, 0xAF, 0xB4, 0xBA, 0xA9, 0xC8, 0xCA,
> +	  0xBE, 0x00, 0x8B, 0x00, 0x8C, 0x00, 0xC0 },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x67, 0x64, 0x3F, 0xBB,
> +	  0xBE, 0xAD, 0xB3, 0xB9, 0xA7, 0xC8, 0xC9,
> +	  0xBE, 0x00, 0x90, 0x00, 0x92, 0x00, 0xC8 },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x63, 0x61, 0x3B, 0xBA,
> +	  0xBE, 0xAC, 0xB3, 0xB8, 0xA7, 0xC6, 0xC8,
> +	  0xBD, 0x00, 0x96, 0x00, 0x98, 0x00, 0xCF },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x61, 0x60, 0x39, 0xBB,
> +	  0xBE, 0xAD, 0xB2, 0xB6, 0xA6, 0xC5, 0xC7,
> +	  0xBD, 0x00, 0x9B, 0x00, 0x9E, 0x00, 0xD5 },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x61, 0x5F, 0x39, 0xBA,
> +	  0xBD, 0xAD, 0xB1, 0xB6, 0xA5, 0xC4, 0xC5,
> +	  0xBC, 0x00, 0xA0, 0x00, 0xA4, 0x00, 0xDB },
> +};
> +
> +/* array of gamma tables for gamma value 1.7 */
> +static u8 const s6e63m0_gamma_17[MAX_GAMMA_LEVEL][GAMMA_TABLE_COUNT] = {
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x8F, 0x73, 0x63, 0xD1,
> +	  0xD0, 0xC5, 0xCC, 0xD1, 0xC2, 0xDE, 0xE0,
> +	  0xD6, 0x00, 0x39, 0x00, 0x36, 0x00, 0x51 },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x82, 0x7A, 0x5B, 0xC8,
> +	  0xCB, 0xBD, 0xC5, 0xCA, 0xBA, 0xD6, 0xD8,
> +	  0xCE, 0x00, 0x5D, 0x00, 0x5E, 0x00, 0x82 },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x81, 0x7B, 0x5D, 0xC6,
> +	  0xCA, 0xBB, 0xC3, 0xC7, 0xB8, 0xD6, 0xD8,
> +	  0xCD, 0x00, 0x65, 0x00, 0x67, 0x00, 0x8D },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x7B, 0x77, 0x58, 0xC3,
> +	  0xC8, 0xB8, 0xC2, 0xC6, 0xB6, 0xD3, 0xD4,
> +	  0xCA, 0x00, 0x71, 0x00, 0x73, 0x00, 0x9E },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x75, 0x77, 0x54, 0xC3,
> +	  0xC7, 0xB7, 0xC0, 0xC3, 0xB4, 0xD1, 0xD3,
> +	  0xC9, 0x00, 0x7B, 0x00, 0x7E, 0x00, 0xAB },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x72, 0x75, 0x51, 0xC2,
> +	  0xC6, 0xB5, 0xBF, 0xC1, 0xB3, 0xCE, 0xD1,
> +	  0xC6, 0x00, 0x85, 0x00, 0x88, 0x00, 0xBA },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x71, 0x73, 0x4F, 0xC2,
> +	  0xC5, 0xB5, 0xBD, 0xC0, 0xB2, 0xCD, 0xD1,
> +	  0xC5, 0x00, 0x8B, 0x00, 0x8E, 0x00, 0xC2 },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x71, 0x72, 0x4F, 0xC2,
> +	  0xC4, 0xB5, 0xBB, 0xBF, 0xB0, 0xCC, 0xCF,
> +	  0xC3, 0x00, 0x91, 0x00, 0x95, 0x00, 0xCA },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x72, 0x72, 0x50, 0xC0,
> +	  0xC3, 0xB4, 0xB9, 0xBE, 0xAE, 0xCC, 0xCF,
> +	  0xC4, 0x00, 0x97, 0x00, 0x9A, 0x00, 0xD1 },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x71, 0x71, 0x50, 0xBF,
> +	  0xC2, 0xB2, 0xBA, 0xBE, 0xAE, 0xCB, 0xCD,
> +	  0xC3, 0x00, 0x9C, 0x00, 0x9F, 0x00, 0xD6 },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x70, 0x70, 0x4F, 0xBF,
> +	  0xC2, 0xB2, 0xB8, 0xBC, 0xAC, 0xCB, 0xCD,
> +	  0xC3, 0x00, 0xA0, 0x00, 0xA4, 0x00, 0xDB },
> +};
All the gama entries starts with:
MCS_GAMMA_CTRL, 0x00, 0x18, 0x08, 0x24,

That could be documented using a #define but taht may also
confuse.


> +
> +#define S6E63M0_STATE_BIT_ENABLED       0

Please use BIT(0) here as it is a bit that is pointed out.

> +
> +struct s6e63m0 {
> +	struct device *dev;
> +	struct drm_panel panel;
> +
> +	struct regulator_bulk_data supplies[2];
> +	struct gpio_desc *reset_gpio;
> +	u32 power_on_delay;
> +	u32 power_off_delay;
> +	u32 reset_delay;
> +	struct videomode vm;
> +	u32 width_mm;
> +	u32 height_mm;
> +
> +	unsigned long state;
> +	unsigned int gamma_mode;
> +	int brightness;
> +
> +	/* This field is tested by functions directly accessing bus before
> +	 * transfer, transfer is skipped if it is set. In case of transfer
> +	 * failure or unexpected response the field is set to error value.
> +	 * Such construct allows to eliminate many checks in higher level
> +	 * functions.
> +	 */
kernel style require that multi line comments starts with
	/*
	 * Here goes blah blah.

> +	int error;
> +};
> +
> +static inline struct s6e63m0 *panel_to_s6e63m0(struct drm_panel *panel)
> +{
> +	return container_of(panel, struct s6e63m0, panel);
> +}
> +
> +static int s6e63m0_clear_error(struct s6e63m0 *ctx)
> +{
> +	int ret = ctx->error;
> +
> +	ctx->error = 0;
> +	return ret;
> +}
> +
> +static int s6e63m0_spi_write_word(struct s6e63m0 *ctx, u16 data)
> +{
> +	struct spi_device *spi = to_spi_device(ctx->dev);
> +	struct spi_transfer xfer = {
> +		.len	= 2,
> +		.tx_buf = &data,
> +	};
> +	struct spi_message msg;
> +
> +	spi_message_init(&msg);
> +	spi_message_add_tail(&xfer, &msg);
> +
> +	return spi_sync(spi, &msg);
> +}
> +
> +static void s6e63m0_dcs_write(struct s6e63m0 *ctx, const u8 *data, size_t len)
> +{
> +	int ret = 0;
> +
> +	if (ctx->error < 0 || len == 0)
> +		return;
> +
> +	dev_dbg(ctx->dev, "writing dcs seq: %*ph\n", (int)len, data);
Use DRM_DEV_ERROR() to be consistent with the DRM subsystem.
General comment that goes for all uses of dev_xxx().

> +	ret = s6e63m0_spi_write_word(ctx, *data);
> +
> +	while (!ret && --len) {
> +		++data;
> +		ret = s6e63m0_spi_write_word(ctx, *data | 0x100);
Consider a constant for the today hardcoded 0x100

> +	}
> +
> +	if (ret) {
> +		dev_err(ctx->dev, "error %d writing dcs seq: %*ph\n", ret,
> +			(int)len, data);
> +		ctx->error = ret;
> +	}
> +
> +	usleep_range(300, 310);
> +}
> +
> +#define s6e63m0_dcs_write_seq_static(ctx, seq ...) \
> +	({ \
> +		static const u8 d[] = { seq }; \
> +		s6e63m0_dcs_write(ctx, d, ARRAY_SIZE(d)); \
> +	})
> +
> +static void s6e63m0_brightness_set(struct s6e63m0 *ctx)
> +{
> +	/* disable and set new gamma */
> +	switch (ctx->gamma_mode) {
> +	case GAMMA_MODE_22:
> +		s6e63m0_dcs_write(ctx,
> +				  s6e63m0_gamma_22[ctx->brightness],
> +				  ARRAY_SIZE(s6e63m0_gamma_22[ctx->brightness])
> +				  );
> +		break;
> +	case GAMMA_MODE_19:
> +		s6e63m0_dcs_write(ctx,
> +				  s6e63m0_gamma_19[ctx->brightness],
> +				  ARRAY_SIZE(s6e63m0_gamma_19[ctx->brightness])
> +				  );
> +		break;
> +	case GAMMA_MODE_17:
> +		s6e63m0_dcs_write(ctx,
> +				  s6e63m0_gamma_17[ctx->brightness],
> +				  ARRAY_SIZE(s6e63m0_gamma_17[ctx->brightness])
> +				  );
> +		break;
> +	default:
> +		dev_info(ctx->dev,
> +			 "gamma mode could be 0:2.2, 1:1.9 or 2:1.7.Assuming 2.2\n"
> +			 );
> +		s6e63m0_dcs_write(ctx,
> +				  s6e63m0_gamma_22[ctx->brightness],
> +				  ARRAY_SIZE(s6e63m0_gamma_22[ctx->brightness])
> +				  );
> +		break;
> +	}
Do something like:

	u8 *tbl;
	size_t len;

	case GAMMA_MODE_22:
		tbl = s6e63m0_gamma_22[ctx->brightness];
		len = ARRAY_SIZE(s6e63m0_gamma_22[ctx->brightness];
		break;
	case GAMMA_MODE_19:
		...
	}

	s6e63m0_dcs_write(ctx, tbl, len);


Improves readability, same function.

> +
> +	/* update gamma table. */
> +	s6e63m0_dcs_write_seq_static(ctx, MCS_GAMMA_CTRL, 0x01);
> +}
> +
> +static void s6e63m0_init(struct s6e63m0 *ctx)
> +{
> +	s6e63m0_dcs_write_seq_static(ctx, MCS_PANEL_CONDITION,
> +				     0x01, 0x27, 0x27, 0x07, 0x07, 0x54, 0x9f,
> +				     0x63, 0x86, 0x1a, 0x33, 0x0d, 0x00, 0x00);
> +
> +	s6e63m0_dcs_write_seq_static(ctx, MCS_DISPLAY_CONDITION,
> +				     0x02, 0x03, 0x1c, 0x10, 0x10);
> +	s6e63m0_dcs_write_seq_static(ctx, 0xf7,
> +				     0x03, 0x00, 0x00);
> +
> +	s6e63m0_dcs_write_seq_static(ctx, MCS_GAMMA_CTRL,
> +				     0x00, 0x18, 0x08, 0x24, 0x64, 0x56, 0x33,
> +				     0xb6, 0xba, 0xa8, 0xac, 0xb1, 0x9d, 0xc1,
> +				     0xc1, 0xb7, 0x00, 0x9c, 0x00, 0x9f, 0x00,
> +				     0xd6);
> +	s6e63m0_dcs_write_seq_static(ctx, MCS_GAMMA_CTRL,
> +				     0x01);
> +
> +	s6e63m0_dcs_write_seq_static(ctx, MCS_ETC_CONDITION,
> +				     0x00, 0x8c, 0x07);
> +	s6e63m0_dcs_write_seq_static(ctx, 0xb3,
> +				     0xc);
> +
> +	s6e63m0_dcs_write_seq_static(ctx, 0xb5,
> +				     0x2c, 0x12, 0x0c, 0x0a, 0x10, 0x0e, 0x17,
> +				     0x13, 0x1f, 0x1a, 0x2a, 0x24, 0x1f, 0x1b,
> +				     0x1a, 0x17, 0x2b, 0x26, 0x22, 0x20, 0x3a,
> +				     0x34, 0x30, 0x2c, 0x29, 0x26, 0x25, 0x23,
> +				     0x21, 0x20, 0x1e, 0x1e);
> +
> +	s6e63m0_dcs_write_seq_static(ctx, 0xb6,
> +				     0x00, 0x00, 0x11, 0x22, 0x33, 0x44, 0x44,
> +				     0x44, 0x55, 0x55, 0x66, 0x66, 0x66, 0x66,
> +				     0x66, 0x66);
> +
> +	s6e63m0_dcs_write_seq_static(ctx, 0xb7,
> +				     0x2c, 0x12, 0x0c, 0x0a, 0x10, 0x0e, 0x17,
> +				     0x13, 0x1f, 0x1a, 0x2a, 0x24, 0x1f, 0x1b,
> +				     0x1a, 0x17, 0x2b, 0x26, 0x22, 0x20, 0x3a,
> +				     0x34, 0x30, 0x2c, 0x29, 0x26, 0x25, 0x23,
> +				     0x21, 0x20, 0x1e, 0x1e, 0x00, 0x00, 0x11,
> +				     0x22, 0x33, 0x44, 0x44, 0x44, 0x55, 0x55,
> +				     0x66, 0x66, 0x66, 0x66, 0x66, 0x66);
> +
> +	s6e63m0_dcs_write_seq_static(ctx, 0xb9,
> +				     0x2c, 0x12, 0x0c, 0x0a, 0x10, 0x0e, 0x17,
> +				     0x13, 0x1f, 0x1a, 0x2a, 0x24, 0x1f, 0x1b,
> +				     0x1a, 0x17, 0x2b, 0x26, 0x22, 0x20, 0x3a,
> +				     0x34, 0x30, 0x2c, 0x29, 0x26, 0x25, 0x23,
> +				     0x21, 0x20, 0x1e, 0x1e);
> +
> +	s6e63m0_dcs_write_seq_static(ctx, 0xba,
> +				     0x00, 0x00, 0x11, 0x22, 0x33, 0x44, 0x44,
> +				     0x44, 0x55, 0x55, 0x66, 0x66, 0x66, 0x66,
> +				     0x66, 0x66);
> +
> +	s6e63m0_dcs_write_seq_static(ctx, 0xc1,
> +				     0x4d, 0x96, 0x1d, 0x00, 0x00, 0x01, 0xdf,
> +				     0x00, 0x00, 0x03, 0x1f, 0x00, 0x00, 0x00,
> +				     0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x06,
> +				     0x09, 0x0d, 0x0f, 0x12, 0x15, 0x18);
> +
> +	s6e63m0_dcs_write_seq_static(ctx, 0xb2,
> +				     0x10, 0x10, 0x0b, 0x05);
> +
> +	s6e63m0_dcs_write_seq_static(ctx, MCS_ACL_CTRL,
> +				     0x01);
> +
> +	s6e63m0_dcs_write_seq_static(ctx, MCS_ELVSS_ON,
> +				     0x0b);
> +
> +	s6e63m0_dcs_write_seq_static(ctx, MCS_STAND_BY_OFF);
> +
> +	s6e63m0_dcs_write_seq_static(ctx, MCS_DISPLAY_ON);
> +
> +	s6e63m0_brightness_set(ctx);
> +}
> +
> +static int s6e63m0_power_on(struct s6e63m0 *ctx)
> +{
> +	int ret;
> +
> +	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
> +	if (ret < 0)
> +		return ret;
> +
> +	msleep(ctx->power_on_delay);
> +
> +	gpiod_set_value(ctx->reset_gpio, 1);
> +	msleep(ctx->reset_delay);
It should really not be required to set reset to '1' here.
If it is required then move it before power is turned on, so we avoid
the panel is starting up, reset and then starting up.

> +	gpiod_set_value(ctx->reset_gpio, 0);
> +	msleep(ctx->reset_delay);
> +
> +	return 0;
> +}
> +
> +static int s6e63m0_power_off(struct s6e63m0 *ctx)
> +{
> +	msleep(ctx->power_off_delay);
> +
> +	return regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
> +}
We deassert reset at power_on, so it suprises we do not assert reset here?

> +
> +static int s6e63m0_disable(struct drm_panel *panel)
> +{
> +	return 0;
> +}
Should you not turn brightness down here?
And turn off the display or go to sleep mode?

> +
> +static int s6e63m0_unprepare(struct drm_panel *panel)
> +{
> +	struct s6e63m0 *ctx = panel_to_s6e63m0(panel);
> +
> +	clear_bit(S6E63M0_STATE_BIT_ENABLED, &ctx->state);
> +
> +	s6e63m0_dcs_write_seq_static(ctx, MIPI_DCS_ENTER_SLEEP_MODE);
> +
> +	s6e63m0_clear_error(ctx);
> +
> +	return s6e63m0_power_off(ctx);
> +}
> +
> +static int s6e63m0_prepare(struct drm_panel *panel)
> +{
> +	struct s6e63m0 *ctx = panel_to_s6e63m0(panel);
> +	int ret;
> +
> +	ret = s6e63m0_power_on(ctx);
> +	if (ret < 0)
> +		return ret;
> +
> +	s6e63m0_init(ctx);
> +
> +	ret = s6e63m0_clear_error(ctx);
> +
> +	if (ret < 0)
> +		s6e63m0_unprepare(panel);
> +	else
> +		set_bit(S6E63M0_STATE_BIT_ENABLED, &ctx->state);
> +
> +	return ret;
> +}
> +
> +static int s6e63m0_enable(struct drm_panel *panel)
> +{
> +	return 0;
> +}
This looks like the right spot to turn on brightness
And to tunr on the display.

> +
> +static int s6e63m0_get_modes(struct drm_panel *panel)
> +{
> +	struct drm_connector *connector = panel->connector;
> +	struct s6e63m0 *ctx = panel_to_s6e63m0(panel);
> +	struct drm_display_mode *mode;
> +
> +	mode = drm_mode_create(connector->dev);
> +	if (!mode) {
> +		DRM_ERROR("failed to create a new display mode\n");
> +		return 0;
> +	}
> +
> +	drm_display_mode_from_videomode(&ctx->vm, mode);
> +	mode->width_mm = ctx->width_mm;
> +	mode->height_mm = ctx->height_mm;
> +	connector->display_info.width_mm = mode->width_mm;
> +	connector->display_info.height_mm = mode->height_mm;
> +
> +	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
> +	mode->flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC;
> +	drm_mode_probed_add(connector, mode);
> +
> +	return 1;
> +}
> +
> +static const struct drm_panel_funcs s6e63m0_drm_funcs = {
> +	.disable	= s6e63m0_disable,
> +	.unprepare	= s6e63m0_unprepare,
> +	.prepare	= s6e63m0_prepare,
> +	.enable		= s6e63m0_enable,
> +	.get_modes	= s6e63m0_get_modes,
> +};
> +
> +static int s6e63m0_get_brightness(struct backlight_device *bd)
> +{
> +	return bd->props.brightness;
> +}
> +
> +static int s6e63m0_set_brightness(struct backlight_device *bd)
> +{
> +	struct s6e63m0 *ctx = bl_get_data(bd);
> +
> +	bd->props.power = FB_BLANK_UNBLANK;
> +	if (ctx->brightness != bd->props.brightness) {
> +		ctx->brightness = bd->props.brightness;
> +		if (test_bit(S6E63M0_STATE_BIT_ENABLED, &ctx->state))
> +			s6e63m0_brightness_set(ctx);
> +	}
> +
> +	return s6e63m0_clear_error(ctx);
> +}
> +
> +static const struct backlight_ops s6e63m0_backlight_ops = {
> +	.get_brightness = s6e63m0_get_brightness,
> +	.update_status	= s6e63m0_set_brightness,
> +};
> +
> +static void s6e63m0_backlight_register(struct s6e63m0 *ctx)
> +{
> +	struct backlight_properties props = {
> +		.type		= BACKLIGHT_RAW,
> +		.brightness	= ctx->brightness,
> +		.max_brightness = MAX_BRIGHTNESS
> +	};
> +	struct device *dev = ctx->dev;
> +	struct backlight_device *bd;
> +
> +	bd = devm_backlight_device_register(dev, "panel", dev, ctx,
> +					    &s6e63m0_backlight_ops, &props);
> +	if (IS_ERR(bd))
> +		dev_err(dev, "error registering backlight device (%ld)\n",
> +			PTR_ERR(bd));
> +}
> +
> +
> +static ssize_t s6e63m0_sysfs_gamma_mode_show(struct device *dev,
> +					     struct device_attribute *attr,
> +					     char *buf)
> +{
> +	struct s6e63m0 *ctx = dev_get_drvdata(dev);
> +	char temp[10];
> +
> +	switch (ctx->gamma_mode) {
> +	case GAMMA_MODE_22:
> +		sprintf(temp, "2.2 mode\n");
> +		strcat(buf, temp);
> +		break;
> +	case GAMMA_MODE_19:
> +		sprintf(temp, "1.9 mode\n");
> +		strcat(buf, temp);
> +		break;
> +	case GAMMA_MODE_17:
> +		sprintf(temp, "1.7 mode\n");
> +		strcat(buf, temp);
> +		break;
> +	default:
> +		dev_info(dev, "gamma mode could be 0:2.2, 1:1.9 or 2:1.7)n");
> +		break;
> +	}
> +
> +	return strlen(buf);
> +}
> +
> +static ssize_t s6e63m0_sysfs_gamma_mode_store(struct device *dev,
> +					      struct device_attribute *attr,
> +					      const char *buf, size_t len)
> +{
> +	struct s6e63m0 *ctx = dev_get_drvdata(dev);
> +	int rc;
> +
> +	rc = kstrtouint(buf, 0, &ctx->gamma_mode);
> +	if (rc < 0)
> +		return rc;
> +
> +	s6e63m0_brightness_set(ctx);
> +	return len;
> +}
> +
> +static DEVICE_ATTR(gamma_mode, 0644,
> +		   s6e63m0_sysfs_gamma_mode_show,
> +		   s6e63m0_sysfs_gamma_mode_store);

It looks like a local hack to use a sysfs file to select between
the different gamma modes.
Someone with more drm knowledge needs to comment if this is an OK way to do it.

> +
> +static int s6e63m0_parse_dt(struct s6e63m0 *ctx)
> +{
> +	struct device *dev = ctx->dev;
> +	struct device_node *np = dev->of_node;
> +	int ret;
> +
> +	ret = of_get_videomode(np, &ctx->vm, 0);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = of_property_read_u32(np, "power-on-delay", &ctx->power_on_delay);
> +	if (ret) {
> +		dev_info(ctx->dev, "using default power-on-delay of 25ms");
> +		ctx->power_on_delay = 25;
> +	}
> +
> +	ret = of_property_read_u32(np, "power-off-delay",
> +				   &ctx->power_off_delay);
> +	if (ret) {
> +		dev_info(ctx->dev, "using default power-of-delay of 200ms");
> +		ctx->power_off_delay = 200;
> +	}
> +
> +	ret = of_property_read_u32(np, "reset-delay", &ctx->reset_delay);
> +	if (ret) {
> +		dev_info(ctx->dev, "using default reset-delay of 120ms");
> +		ctx->reset_delay = 120;
> +	}
> +
> +	of_property_read_u32(np, "panel-width-mm", &ctx->width_mm);
> +	of_property_read_u32(np, "panel-height-mm", &ctx->height_mm);
> +
> +	return 0;
> +}
> +
> +static int s6e63m0_probe(struct spi_device *spi)
> +{
> +	struct device *dev = &spi->dev;
> +	struct s6e63m0 *ctx;
> +	int ret;
> +
> +	ctx = devm_kzalloc(dev, sizeof(struct s6e63m0), GFP_KERNEL);
> +	if (!ctx)
> +		return -ENOMEM;
> +
> +	spi_set_drvdata(spi, ctx);
> +
> +	ctx->dev = dev;
> +	ctx->brightness = MAX_BRIGHTNESS;
> +	ctx->gamma_mode = GAMMA_MODE_22;
> +
> +	ret = s6e63m0_parse_dt(ctx);
> +	if (ret < 0)
> +		return ret;
> +
> +	ctx->supplies[0].supply = "vdd3";
> +	ctx->supplies[1].supply = "vci";
> +	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
> +				      ctx->supplies);
> +	if (ret < 0) {
> +		dev_err(dev, "failed to get regulators: %d\n", ret);
> +		return ret;
> +	}
> +
> +	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
> +	if (IS_ERR(ctx->reset_gpio)) {
> +		dev_err(dev, "cannot get reset-gpios %ld\n",
> +			PTR_ERR(ctx->reset_gpio));
> +		return PTR_ERR(ctx->reset_gpio);
> +	}
> +
> +	spi->bits_per_word = 9;
> +	spi->mode = SPI_MODE_3;
> +	ret = spi_setup(spi);
> +	if (ret < 0) {
> +		dev_err(dev, "spi setup failed.\n");
> +		return ret;
> +	}
> +
> +	ret = device_create_file(dev, &dev_attr_gamma_mode);
> +	if (ret < 0)
> +		dev_err(dev, "failed to add sysfs entries\n");
> +
> +	drm_panel_init(&ctx->panel);
> +	ctx->panel.dev = dev;
> +	ctx->panel.funcs = &s6e63m0_drm_funcs;
> +
> +	ret = drm_panel_add(&ctx->panel);
> +	if (ret < 0)
> +		goto err_remove_file;
> +
> +	s6e63m0_backlight_register(ctx);
> +
> +	return 0;
> +
> +err_remove_file:
> +	device_remove_file(dev, &dev_attr_gamma_mode);
> +
> +	return ret;
> +}
> +
> +static int s6e63m0_remove(struct spi_device *spi)
> +{
> +	struct s6e63m0 *ctx = spi_get_drvdata(spi);
> +
> +	s6e63m0_power_off(ctx);
> +	drm_panel_remove(&ctx->panel);
> +	device_remove_file(ctx->dev, &dev_attr_gamma_mode);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id s6e63m0_of_match[] = {
> +	{ .compatible = "samsung,s6e63m0" },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, s6e63m0_of_match);
> +
> +static struct spi_driver s6e63m0_driver = {
> +	.probe			= s6e63m0_probe,
> +	.remove			= s6e63m0_remove,
> +	.driver			= {
> +		.name		= "panel-samsung-s6e63m0",
> +		.of_match_table = s6e63m0_of_match,
> +	},
> +};
> +module_spi_driver(s6e63m0_driver);
> +
> +MODULE_AUTHOR("Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>");
> +MODULE_DESCRIPTION("s6e63m0 LCD Driver");
> +MODULE_LICENSE("GPL v2");
This seems not to match the SPDX tag, please verify.

	Sam


^ permalink raw reply	[flat|nested] 7+ messages in thread

* Re: [PATCH 2/2] drm/panel: Add driver for Samsung S6E63M0 panel
  2019-01-25 16:46 ` [PATCH 2/2] drm/panel: Add driver for Samsung S6E63M0 panel Paweł Chmiel
  2019-01-26 21:41   ` Sam Ravnborg
@ 2019-01-28 13:47   ` Andrzej Hajda
  2019-01-28 16:24     ` Paweł Chmiel
  1 sibling, 1 reply; 7+ messages in thread
From: Andrzej Hajda @ 2019-01-28 13:47 UTC (permalink / raw)
  To: Paweł Chmiel, thierry.reding
  Cc: mark.rutland, devicetree, airlied, linux-kernel, krzk, robh+dt,
	dri-devel, m.szyprowski

Hi Paweł,

Nice work.

I agree with most Sam's comments (maybe expect DRM_DEV_* logging - I am
not sure if we need concurrent logging facility).

I'd like to add few more comments:



On 25.01.2019 17:46, Paweł Chmiel wrote:
> This patch adds Samsung S6E63M0 AMOLED LCD panel driver, connected over
> spi. It's based on already removed, non dt s6e63m0 driver and
> panel-samsung-ld9040. There is possibility to choose one from 3
> different gamma tables.
> It can be found for example in some of Samsung Aries based phones.
>
> Signed-off-by: Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>
> ---
>  drivers/gpu/drm/panel/Kconfig                 |   7 +
>  drivers/gpu/drm/panel/Makefile                |   1 +
>  drivers/gpu/drm/panel/panel-samsung-s6e63m0.c | 712 ++++++++++++++++++
>  3 files changed, 720 insertions(+)
>  create mode 100644 drivers/gpu/drm/panel/panel-samsung-s6e63m0.c
>
> diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
> index 3f3537719beb..4a4b64f74e70 100644
> --- a/drivers/gpu/drm/panel/Kconfig
> +++ b/drivers/gpu/drm/panel/Kconfig
> @@ -82,6 +82,13 @@ config DRM_PANEL_SAMSUNG_LD9040
>  	depends on OF && SPI
>  	select VIDEOMODE_HELPERS
>  
> +config DRM_PANEL_SAMSUNG_S6E63M0
> +	tristate "Samsung S6E63M0 RGB/SPI panel"
> +	depends on OF
> +	depends on SPI
> +	depends on BACKLIGHT_CLASS_DEVICE
> +	select VIDEOMODE_HELPERS
> +
>  config DRM_PANEL_LG_LG4573
>  	tristate "LG4573 RGB/SPI panel"
>  	depends on OF && SPI
> diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
> index 4396658a7996..3e5d53fdee47 100644
> --- a/drivers/gpu/drm/panel/Makefile
> +++ b/drivers/gpu/drm/panel/Makefile
> @@ -14,6 +14,7 @@ obj-$(CONFIG_DRM_PANEL_RASPBERRYPI_TOUCHSCREEN) += panel-raspberrypi-touchscreen
>  obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM68200) += panel-raydium-rm68200.o
>  obj-$(CONFIG_DRM_PANEL_SAMSUNG_LD9040) += panel-samsung-ld9040.o
>  obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6D16D0) += panel-samsung-s6d16d0.o
> +obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E63M0) += panel-samsung-s6e63m0.o
>  obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E3HA2) += panel-samsung-s6e3ha2.o
>  obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E63J0X03) += panel-samsung-s6e63j0x03.o
>  obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E8AA0) += panel-samsung-s6e8aa0.o
> diff --git a/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c b/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c
> new file mode 100644
> index 000000000000..cb5c090621ad
> --- /dev/null
> +++ b/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c
> @@ -0,0 +1,712 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * S6E63M0 AMOLED LCD drm_panel driver.
> + *
> + * Copyright (C) 2019 Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>
> + * Derived from drivers/gpu/drm/panel-samsung-ld9040.c
> + *
> + * Andrzej Hajda <a.hajda@samsung.com>
> + *
> + * This program is free software; you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License version 2 as
> + * published by the Free Software Foundation.


You do not need license 'body' if SPDX is in use.


> + */
> +
> +#include <drm/drmP.h>
> +#include <drm/drm_panel.h>
> +
> +#include <linux/backlight.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/regulator/consumer.h>
> +#include <linux/spi/spi.h>
> +
> +#include <video/mipi_display.h>
> +#include <video/of_videomode.h>
> +#include <video/videomode.h>
> +
> +/* Manufacturer Command Set */
> +#define MCS_STAND_BY_OFF                0x11

MIPI_DCS_EXIT_SLEEP_MODE

> +#define MCS_DISPLAY_ON                  0x29
MIPI_DCS_SET_DISPLAY_ON
> +#define MCS_ELVSS_ON                0xb1
> +#define MCS_ACL_CTRL                0xc0
> +#define MCS_DISPLAY_CONDITION   0xf2
> +#define MCS_ETC_CONDITION           0xf6
> +#define MCS_PANEL_CONDITION         0xF8
> +#define MCS_GAMMA_CTRL              0xfa
> +
> +#define MAX_GAMMA_LEVEL             11


GAMMA_LEVEL_COUNT or NUM_GAMMA_LEVELS ?


> +#define GAMMA_TABLE_COUNT           23
> +
> +#define MAX_BRIGHTNESS              (MAX_GAMMA_LEVEL - 1)
> +#define GAMMA_MODE_22               0
> +#define GAMMA_MODE_19               1
> +#define GAMMA_MODE_17               2
> +
> +/* array of gamma tables for gamma value 2.2 */
> +static u8 const s6e63m0_gamma_22[MAX_GAMMA_LEVEL][GAMMA_TABLE_COUNT] = {
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x78, 0xEC, 0x3D, 0xC8,
> +	  0xC2, 0xB6, 0xC4, 0xC7, 0xB6, 0xD5, 0xD7,
> +	  0xCC, 0x00, 0x39, 0x00, 0x36, 0x00, 0x51 },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x73, 0x4A, 0x3D, 0xC0,
> +	  0xC2, 0xB1, 0xBB, 0xBE, 0xAC, 0xCE, 0xCF,
> +	  0xC5, 0x00, 0x5D, 0x00, 0x5E, 0x00, 0x82 },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x70, 0x51, 0x3E, 0xBF,
> +	  0xC1, 0xAF, 0xB9, 0xBC, 0xAB, 0xCC, 0xCC,
> +	  0xC2, 0x00, 0x65, 0x00, 0x67, 0x00, 0x8D },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x6C, 0x54, 0x3A, 0xBC,
> +	  0xBF, 0xAC, 0xB7, 0xBB, 0xA9, 0xC9, 0xC9,
> +	  0xBE, 0x00, 0x71, 0x00, 0x73, 0x00, 0x9E },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x69, 0x54, 0x37, 0xBB,
> +	  0xBE, 0xAC, 0xB4, 0xB7, 0xA6, 0xC7, 0xC8,
> +	  0xBC, 0x00, 0x7B, 0x00, 0x7E, 0x00, 0xAB },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x66, 0x55, 0x34, 0xBA,
> +	  0xBD, 0xAB, 0xB1, 0xB5, 0xA3, 0xC5, 0xC6,
> +	  0xB9, 0x00, 0x85, 0x00, 0x88, 0x00, 0xBA },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x63, 0x53, 0x31, 0xB8,
> +	  0xBC, 0xA9, 0xB0, 0xB5, 0xA2, 0xC4, 0xC4,
> +	  0xB8, 0x00, 0x8B, 0x00, 0x8E, 0x00, 0xC2 },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x62, 0x54, 0x30, 0xB9,
> +	  0xBB, 0xA9, 0xB0, 0xB3, 0xA1, 0xC1, 0xC3,
> +	  0xB7, 0x00, 0x91, 0x00, 0x95, 0x00, 0xDA },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x66, 0x58, 0x34, 0xB6,
> +	  0xBA, 0xA7, 0xAF, 0xB3, 0xA0, 0xC1, 0xC2,
> +	  0xB7, 0x00, 0x97, 0x00, 0x9A, 0x00, 0xD1 },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x64, 0x56, 0x33, 0xB6,
> +	  0xBA, 0xA8, 0xAC, 0xB1, 0x9D, 0xC1, 0xC1,
> +	  0xB7, 0x00, 0x9C, 0x00, 0x9F, 0x00, 0xD6 },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x5f, 0x50, 0x2d, 0xB6,
> +	  0xB9, 0xA7, 0xAd, 0xB1, 0x9f, 0xbe, 0xC0,
> +	  0xB5, 0x00, 0xa0, 0x00, 0xa4, 0x00, 0xdb },
> +};
> +
> +/* array of gamma tables for gamma value 1.9 */
> +static u8 const s6e63m0_gamma_19[MAX_GAMMA_LEVEL][GAMMA_TABLE_COUNT] = {
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x84, 0x45, 0x4F, 0xCA,
> +	  0xCB, 0xBC, 0xC9, 0xCB, 0xBC, 0xDA, 0xDA,
> +	  0xD0, 0x00, 0x35, 0x00, 0x34, 0x00, 0x4E },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x74, 0x60, 0x4A, 0xC3,
> +	  0xC6, 0xB5, 0xBF, 0xC3, 0xB2, 0xD2, 0xD3,
> +	  0xC8, 0x00, 0x5B, 0x00, 0x5B, 0x00, 0x81 },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x6F, 0x65, 0x46, 0xC2,
> +	  0xC4, 0xB3, 0xBF, 0xC2, 0xB2, 0xCF, 0xD1,
> +	  0xC6, 0x00, 0x64, 0x00, 0x64, 0x00, 0x8D },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x6E, 0x65, 0x45, 0xC0,
> +	  0xC3, 0xB2, 0xBA, 0xBE, 0xAE, 0xCD, 0xD0,
> +	  0xC4, 0x00, 0x70, 0x00, 0x70, 0x00, 0x9C },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x69, 0x64, 0x40, 0xBF,
> +	  0xC1, 0xB0, 0xB9, 0xBE, 0xAD, 0xCB, 0xCD,
> +	  0xC2, 0x00, 0x7A, 0x00, 0x7B, 0x00, 0xAA },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x68, 0x64, 0x3F, 0xBE,
> +	  0xC0, 0xB0, 0xB6, 0xBB, 0xAB, 0xC8, 0xCB,
> +	  0xBF, 0x00, 0x85, 0x00, 0x86, 0x00, 0xB8 },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x68, 0x64, 0x40, 0xBC,
> +	  0xBF, 0xAF, 0xB4, 0xBA, 0xA9, 0xC8, 0xCA,
> +	  0xBE, 0x00, 0x8B, 0x00, 0x8C, 0x00, 0xC0 },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x67, 0x64, 0x3F, 0xBB,
> +	  0xBE, 0xAD, 0xB3, 0xB9, 0xA7, 0xC8, 0xC9,
> +	  0xBE, 0x00, 0x90, 0x00, 0x92, 0x00, 0xC8 },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x63, 0x61, 0x3B, 0xBA,
> +	  0xBE, 0xAC, 0xB3, 0xB8, 0xA7, 0xC6, 0xC8,
> +	  0xBD, 0x00, 0x96, 0x00, 0x98, 0x00, 0xCF },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x61, 0x60, 0x39, 0xBB,
> +	  0xBE, 0xAD, 0xB2, 0xB6, 0xA6, 0xC5, 0xC7,
> +	  0xBD, 0x00, 0x9B, 0x00, 0x9E, 0x00, 0xD5 },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x61, 0x5F, 0x39, 0xBA,
> +	  0xBD, 0xAD, 0xB1, 0xB6, 0xA5, 0xC4, 0xC5,
> +	  0xBC, 0x00, 0xA0, 0x00, 0xA4, 0x00, 0xDB },
> +};
> +
> +/* array of gamma tables for gamma value 1.7 */
> +static u8 const s6e63m0_gamma_17[MAX_GAMMA_LEVEL][GAMMA_TABLE_COUNT] = {
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x8F, 0x73, 0x63, 0xD1,
> +	  0xD0, 0xC5, 0xCC, 0xD1, 0xC2, 0xDE, 0xE0,
> +	  0xD6, 0x00, 0x39, 0x00, 0x36, 0x00, 0x51 },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x82, 0x7A, 0x5B, 0xC8,
> +	  0xCB, 0xBD, 0xC5, 0xCA, 0xBA, 0xD6, 0xD8,
> +	  0xCE, 0x00, 0x5D, 0x00, 0x5E, 0x00, 0x82 },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x81, 0x7B, 0x5D, 0xC6,
> +	  0xCA, 0xBB, 0xC3, 0xC7, 0xB8, 0xD6, 0xD8,
> +	  0xCD, 0x00, 0x65, 0x00, 0x67, 0x00, 0x8D },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x7B, 0x77, 0x58, 0xC3,
> +	  0xC8, 0xB8, 0xC2, 0xC6, 0xB6, 0xD3, 0xD4,
> +	  0xCA, 0x00, 0x71, 0x00, 0x73, 0x00, 0x9E },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x75, 0x77, 0x54, 0xC3,
> +	  0xC7, 0xB7, 0xC0, 0xC3, 0xB4, 0xD1, 0xD3,
> +	  0xC9, 0x00, 0x7B, 0x00, 0x7E, 0x00, 0xAB },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x72, 0x75, 0x51, 0xC2,
> +	  0xC6, 0xB5, 0xBF, 0xC1, 0xB3, 0xCE, 0xD1,
> +	  0xC6, 0x00, 0x85, 0x00, 0x88, 0x00, 0xBA },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x71, 0x73, 0x4F, 0xC2,
> +	  0xC5, 0xB5, 0xBD, 0xC0, 0xB2, 0xCD, 0xD1,
> +	  0xC5, 0x00, 0x8B, 0x00, 0x8E, 0x00, 0xC2 },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x71, 0x72, 0x4F, 0xC2,
> +	  0xC4, 0xB5, 0xBB, 0xBF, 0xB0, 0xCC, 0xCF,
> +	  0xC3, 0x00, 0x91, 0x00, 0x95, 0x00, 0xCA },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x72, 0x72, 0x50, 0xC0,
> +	  0xC3, 0xB4, 0xB9, 0xBE, 0xAE, 0xCC, 0xCF,
> +	  0xC4, 0x00, 0x97, 0x00, 0x9A, 0x00, 0xD1 },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x71, 0x71, 0x50, 0xBF,
> +	  0xC2, 0xB2, 0xBA, 0xBE, 0xAE, 0xCB, 0xCD,
> +	  0xC3, 0x00, 0x9C, 0x00, 0x9F, 0x00, 0xD6 },
> +	{ MCS_GAMMA_CTRL, 0x00,
> +	  0x18, 0x08, 0x24, 0x70, 0x70, 0x4F, 0xBF,
> +	  0xC2, 0xB2, 0xB8, 0xBC, 0xAC, 0xCB, 0xCD,
> +	  0xC3, 0x00, 0xA0, 0x00, 0xA4, 0x00, 0xDB },
> +};
> +
> +#define S6E63M0_STATE_BIT_ENABLED       0
> +
> +struct s6e63m0 {
> +	struct device *dev;
> +	struct drm_panel panel;
> +
> +	struct regulator_bulk_data supplies[2];
> +	struct gpio_desc *reset_gpio;
> +	u32 power_on_delay;
> +	u32 power_off_delay;
> +	u32 reset_delay;
> +	struct videomode vm;
> +	u32 width_mm;
> +	u32 height_mm;
> +
> +	unsigned long state;
> +	unsigned int gamma_mode;
> +	int brightness;
> +
> +	/* This field is tested by functions directly accessing bus before
> +	 * transfer, transfer is skipped if it is set. In case of transfer
> +	 * failure or unexpected response the field is set to error value.
> +	 * Such construct allows to eliminate many checks in higher level
> +	 * functions.
> +	 */
> +	int error;
> +};
> +
> +static inline struct s6e63m0 *panel_to_s6e63m0(struct drm_panel *panel)
> +{
> +	return container_of(panel, struct s6e63m0, panel);
> +}
> +
> +static int s6e63m0_clear_error(struct s6e63m0 *ctx)
> +{
> +	int ret = ctx->error;
> +
> +	ctx->error = 0;
> +	return ret;
> +}
> +
> +static int s6e63m0_spi_write_word(struct s6e63m0 *ctx, u16 data)
> +{
> +	struct spi_device *spi = to_spi_device(ctx->dev);
> +	struct spi_transfer xfer = {
> +		.len	= 2,
> +		.tx_buf = &data,
> +	};
> +	struct spi_message msg;
> +
> +	spi_message_init(&msg);
> +	spi_message_add_tail(&xfer, &msg);
> +
> +	return spi_sync(spi, &msg);
> +}
> +
> +static void s6e63m0_dcs_write(struct s6e63m0 *ctx, const u8 *data, size_t len)
> +{
> +	int ret = 0;
> +
> +	if (ctx->error < 0 || len == 0)
> +		return;
> +
> +	dev_dbg(ctx->dev, "writing dcs seq: %*ph\n", (int)len, data);
> +	ret = s6e63m0_spi_write_word(ctx, *data);
> +
> +	while (!ret && --len) {
> +		++data;
> +		ret = s6e63m0_spi_write_word(ctx, *data | 0x100);
> +	}
> +
> +	if (ret) {
> +		dev_err(ctx->dev, "error %d writing dcs seq: %*ph\n", ret,
> +			(int)len, data);
> +		ctx->error = ret;
> +	}
> +
> +	usleep_range(300, 310);
> +}
> +
> +#define s6e63m0_dcs_write_seq_static(ctx, seq ...) \
> +	({ \
> +		static const u8 d[] = { seq }; \
> +		s6e63m0_dcs_write(ctx, d, ARRAY_SIZE(d)); \
> +	})
> +
> +static void s6e63m0_brightness_set(struct s6e63m0 *ctx)
> +{
> +	/* disable and set new gamma */
> +	switch (ctx->gamma_mode) {
> +	case GAMMA_MODE_22:
> +		s6e63m0_dcs_write(ctx,
> +				  s6e63m0_gamma_22[ctx->brightness],
> +				  ARRAY_SIZE(s6e63m0_gamma_22[ctx->brightness])
> +				  );
> +		break;
> +	case GAMMA_MODE_19:
> +		s6e63m0_dcs_write(ctx,
> +				  s6e63m0_gamma_19[ctx->brightness],
> +				  ARRAY_SIZE(s6e63m0_gamma_19[ctx->brightness])
> +				  );
> +		break;
> +	case GAMMA_MODE_17:
> +		s6e63m0_dcs_write(ctx,
> +				  s6e63m0_gamma_17[ctx->brightness],
> +				  ARRAY_SIZE(s6e63m0_gamma_17[ctx->brightness])
> +				  );
> +		break;
> +	default:
> +		dev_info(ctx->dev,
> +			 "gamma mode could be 0:2.2, 1:1.9 or 2:1.7.Assuming 2.2\n"
> +			 );
> +		s6e63m0_dcs_write(ctx,
> +				  s6e63m0_gamma_22[ctx->brightness],
> +				  ARRAY_SIZE(s6e63m0_gamma_22[ctx->brightness])
> +				  );
> +		break;
> +	}
> +
> +	/* update gamma table. */
> +	s6e63m0_dcs_write_seq_static(ctx, MCS_GAMMA_CTRL, 0x01);
> +}
> +
> +static void s6e63m0_init(struct s6e63m0 *ctx)
> +{
> +	s6e63m0_dcs_write_seq_static(ctx, MCS_PANEL_CONDITION,
> +				     0x01, 0x27, 0x27, 0x07, 0x07, 0x54, 0x9f,
> +				     0x63, 0x86, 0x1a, 0x33, 0x0d, 0x00, 0x00);
> +
> +	s6e63m0_dcs_write_seq_static(ctx, MCS_DISPLAY_CONDITION,
> +				     0x02, 0x03, 0x1c, 0x10, 0x10);
> +	s6e63m0_dcs_write_seq_static(ctx, 0xf7,
> +				     0x03, 0x00, 0x00);
> +
> +	s6e63m0_dcs_write_seq_static(ctx, MCS_GAMMA_CTRL,
> +				     0x00, 0x18, 0x08, 0x24, 0x64, 0x56, 0x33,
> +				     0xb6, 0xba, 0xa8, 0xac, 0xb1, 0x9d, 0xc1,
> +				     0xc1, 0xb7, 0x00, 0x9c, 0x00, 0x9f, 0x00,
> +				     0xd6);
> +	s6e63m0_dcs_write_seq_static(ctx, MCS_GAMMA_CTRL,
> +				     0x01);
> +
> +	s6e63m0_dcs_write_seq_static(ctx, MCS_ETC_CONDITION,
> +				     0x00, 0x8c, 0x07);
> +	s6e63m0_dcs_write_seq_static(ctx, 0xb3,
> +				     0xc);
> +
> +	s6e63m0_dcs_write_seq_static(ctx, 0xb5,
> +				     0x2c, 0x12, 0x0c, 0x0a, 0x10, 0x0e, 0x17,
> +				     0x13, 0x1f, 0x1a, 0x2a, 0x24, 0x1f, 0x1b,
> +				     0x1a, 0x17, 0x2b, 0x26, 0x22, 0x20, 0x3a,
> +				     0x34, 0x30, 0x2c, 0x29, 0x26, 0x25, 0x23,
> +				     0x21, 0x20, 0x1e, 0x1e);
> +
> +	s6e63m0_dcs_write_seq_static(ctx, 0xb6,
> +				     0x00, 0x00, 0x11, 0x22, 0x33, 0x44, 0x44,
> +				     0x44, 0x55, 0x55, 0x66, 0x66, 0x66, 0x66,
> +				     0x66, 0x66);
> +
> +	s6e63m0_dcs_write_seq_static(ctx, 0xb7,
> +				     0x2c, 0x12, 0x0c, 0x0a, 0x10, 0x0e, 0x17,
> +				     0x13, 0x1f, 0x1a, 0x2a, 0x24, 0x1f, 0x1b,
> +				     0x1a, 0x17, 0x2b, 0x26, 0x22, 0x20, 0x3a,
> +				     0x34, 0x30, 0x2c, 0x29, 0x26, 0x25, 0x23,
> +				     0x21, 0x20, 0x1e, 0x1e, 0x00, 0x00, 0x11,
> +				     0x22, 0x33, 0x44, 0x44, 0x44, 0x55, 0x55,
> +				     0x66, 0x66, 0x66, 0x66, 0x66, 0x66);
> +
> +	s6e63m0_dcs_write_seq_static(ctx, 0xb9,
> +				     0x2c, 0x12, 0x0c, 0x0a, 0x10, 0x0e, 0x17,
> +				     0x13, 0x1f, 0x1a, 0x2a, 0x24, 0x1f, 0x1b,
> +				     0x1a, 0x17, 0x2b, 0x26, 0x22, 0x20, 0x3a,
> +				     0x34, 0x30, 0x2c, 0x29, 0x26, 0x25, 0x23,
> +				     0x21, 0x20, 0x1e, 0x1e);
> +
> +	s6e63m0_dcs_write_seq_static(ctx, 0xba,
> +				     0x00, 0x00, 0x11, 0x22, 0x33, 0x44, 0x44,
> +				     0x44, 0x55, 0x55, 0x66, 0x66, 0x66, 0x66,
> +				     0x66, 0x66);
> +
> +	s6e63m0_dcs_write_seq_static(ctx, 0xc1,
> +				     0x4d, 0x96, 0x1d, 0x00, 0x00, 0x01, 0xdf,
> +				     0x00, 0x00, 0x03, 0x1f, 0x00, 0x00, 0x00,
> +				     0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x06,
> +				     0x09, 0x0d, 0x0f, 0x12, 0x15, 0x18);
> +
> +	s6e63m0_dcs_write_seq_static(ctx, 0xb2,
> +				     0x10, 0x10, 0x0b, 0x05);
> +
> +	s6e63m0_dcs_write_seq_static(ctx, MCS_ACL_CTRL,
> +				     0x01);
> +
> +	s6e63m0_dcs_write_seq_static(ctx, MCS_ELVSS_ON,
> +				     0x0b);
> +
> +	s6e63m0_dcs_write_seq_static(ctx, MCS_STAND_BY_OFF);
> +
> +	s6e63m0_dcs_write_seq_static(ctx, MCS_DISPLAY_ON);
> +
> +	s6e63m0_brightness_set(ctx);
> +}
> +
> +static int s6e63m0_power_on(struct s6e63m0 *ctx)
> +{
> +	int ret;
> +
> +	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
> +	if (ret < 0)
> +		return ret;
> +
> +	msleep(ctx->power_on_delay);
> +
> +	gpiod_set_value(ctx->reset_gpio, 1);
> +	msleep(ctx->reset_delay);
> +	gpiod_set_value(ctx->reset_gpio, 0);
> +	msleep(ctx->reset_delay);
> +
> +	return 0;
> +}
> +
> +static int s6e63m0_power_off(struct s6e63m0 *ctx)
> +{
> +	msleep(ctx->power_off_delay);
> +
> +	return regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
> +}
> +
> +static int s6e63m0_disable(struct drm_panel *panel)
> +{
> +	return 0;
> +}
> +
> +static int s6e63m0_unprepare(struct drm_panel *panel)
> +{
> +	struct s6e63m0 *ctx = panel_to_s6e63m0(panel);
> +
> +	clear_bit(S6E63M0_STATE_BIT_ENABLED, &ctx->state);
> +
> +	s6e63m0_dcs_write_seq_static(ctx, MIPI_DCS_ENTER_SLEEP_MODE);
> +
> +	s6e63m0_clear_error(ctx);
> +
> +	return s6e63m0_power_off(ctx);
> +}
> +
> +static int s6e63m0_prepare(struct drm_panel *panel)
> +{
> +	struct s6e63m0 *ctx = panel_to_s6e63m0(panel);
> +	int ret;
> +
> +	ret = s6e63m0_power_on(ctx);
> +	if (ret < 0)
> +		return ret;
> +
> +	s6e63m0_init(ctx);
> +
> +	ret = s6e63m0_clear_error(ctx);
> +
> +	if (ret < 0)
> +		s6e63m0_unprepare(panel);
> +	else
> +		set_bit(S6E63M0_STATE_BIT_ENABLED, &ctx->state);
> +
> +	return ret;
> +}
> +
> +static int s6e63m0_enable(struct drm_panel *panel)
> +{
> +	return 0;
> +}
> +
> +static int s6e63m0_get_modes(struct drm_panel *panel)
> +{
> +	struct drm_connector *connector = panel->connector;
> +	struct s6e63m0 *ctx = panel_to_s6e63m0(panel);
> +	struct drm_display_mode *mode;
> +
> +	mode = drm_mode_create(connector->dev);
> +	if (!mode) {
> +		DRM_ERROR("failed to create a new display mode\n");
> +		return 0;
> +	}
> +
> +	drm_display_mode_from_videomode(&ctx->vm, mode);
> +	mode->width_mm = ctx->width_mm;
> +	mode->height_mm = ctx->height_mm;
> +	connector->display_info.width_mm = mode->width_mm;
> +	connector->display_info.height_mm = mode->height_mm;
> +
> +	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
> +	mode->flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC;
> +	drm_mode_probed_add(connector, mode);
> +
> +	return 1;
> +}
> +
> +static const struct drm_panel_funcs s6e63m0_drm_funcs = {
> +	.disable	= s6e63m0_disable,
> +	.unprepare	= s6e63m0_unprepare,
> +	.prepare	= s6e63m0_prepare,
> +	.enable		= s6e63m0_enable,
> +	.get_modes	= s6e63m0_get_modes,
> +};
> +
> +static int s6e63m0_get_brightness(struct backlight_device *bd)
> +{
> +	return bd->props.brightness;
> +}


This callback can be omitted AFAIK.


> +
> +static int s6e63m0_set_brightness(struct backlight_device *bd)
> +{
> +	struct s6e63m0 *ctx = bl_get_data(bd);
> +
> +	bd->props.power = FB_BLANK_UNBLANK;
> +	if (ctx->brightness != bd->props.brightness) {
> +		ctx->brightness = bd->props.brightness;
> +		if (test_bit(S6E63M0_STATE_BIT_ENABLED, &ctx->state))
> +			s6e63m0_brightness_set(ctx);


It is racy: one thread setting brightness, another disabling panel,
nasty timings and we have attempt to send data to disabled panel.

I do not know backlight framework too much but it does not integrate
well with drm's IMO.

I guess some solution would be to add mutex protecting from concurrent
hw accesses from drm and backlight APIs.


> +	}
> +
> +	return s6e63m0_clear_error(ctx);
> +}
> +
> +static const struct backlight_ops s6e63m0_backlight_ops = {
> +	.get_brightness = s6e63m0_get_brightness,
> +	.update_status	= s6e63m0_set_brightness,
> +};
> +
> +static void s6e63m0_backlight_register(struct s6e63m0 *ctx)
> +{
> +	struct backlight_properties props = {
> +		.type		= BACKLIGHT_RAW,
> +		.brightness	= ctx->brightness,
> +		.max_brightness = MAX_BRIGHTNESS
> +	};
> +	struct device *dev = ctx->dev;
> +	struct backlight_device *bd;
> +
> +	bd = devm_backlight_device_register(dev, "panel", dev, ctx,
> +					    &s6e63m0_backlight_ops, &props);
> +	if (IS_ERR(bd))
> +		dev_err(dev, "error registering backlight device (%ld)\n",
> +			PTR_ERR(bd));
> +}
> +
> +
> +static ssize_t s6e63m0_sysfs_gamma_mode_show(struct device *dev,
> +					     struct device_attribute *attr,
> +					     char *buf)
> +{
> +	struct s6e63m0 *ctx = dev_get_drvdata(dev);
> +	char temp[10];
> +
> +	switch (ctx->gamma_mode) {
> +	case GAMMA_MODE_22:
> +		sprintf(temp, "2.2 mode\n");
> +		strcat(buf, temp);
> +		break;
> +	case GAMMA_MODE_19:
> +		sprintf(temp, "1.9 mode\n");
> +		strcat(buf, temp);
> +		break;
> +	case GAMMA_MODE_17:
> +		sprintf(temp, "1.7 mode\n");
> +		strcat(buf, temp);
> +		break;
> +	default:
> +		dev_info(dev, "gamma mode could be 0:2.2, 1:1.9 or 2:1.7)n");
> +		break;
> +	}
> +
> +	return strlen(buf);
> +}
> +
> +static ssize_t s6e63m0_sysfs_gamma_mode_store(struct device *dev,
> +					      struct device_attribute *attr,
> +					      const char *buf, size_t len)
> +{
> +	struct s6e63m0 *ctx = dev_get_drvdata(dev);
> +	int rc;
> +
> +	rc = kstrtouint(buf, 0, &ctx->gamma_mode);
> +	if (rc < 0)
> +		return rc;
> +
> +	s6e63m0_brightness_set(ctx);
> +	return len;
> +}
> +
> +static DEVICE_ATTR(gamma_mode, 0644,
> +		   s6e63m0_sysfs_gamma_mode_show,
> +		   s6e63m0_sysfs_gamma_mode_store);


I see this attribute was copied from vendor code, but it is still
unclear how it was used there. Have you seen userspace code that used
this property?


> +
> +static int s6e63m0_parse_dt(struct s6e63m0 *ctx)
> +{
> +	struct device *dev = ctx->dev;
> +	struct device_node *np = dev->of_node;
> +	int ret;
> +
> +	ret = of_get_videomode(np, &ctx->vm, 0);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = of_property_read_u32(np, "power-on-delay", &ctx->power_on_delay);
> +	if (ret) {
> +		dev_info(ctx->dev, "using default power-on-delay of 25ms");
> +		ctx->power_on_delay = 25;
> +	}
> +
> +	ret = of_property_read_u32(np, "power-off-delay",
> +				   &ctx->power_off_delay);
> +	if (ret) {
> +		dev_info(ctx->dev, "using default power-of-delay of 200ms");
> +		ctx->power_off_delay = 200;
> +	}
> +
> +	ret = of_property_read_u32(np, "reset-delay", &ctx->reset_delay);
> +	if (ret) {
> +		dev_info(ctx->dev, "using default reset-delay of 120ms");
> +		ctx->reset_delay = 120;
> +	}
> +
> +	of_property_read_u32(np, "panel-width-mm", &ctx->width_mm);
> +	of_property_read_u32(np, "panel-height-mm", &ctx->height_mm);
> +
> +	return 0;
> +}
> +
> +static int s6e63m0_probe(struct spi_device *spi)
> +{
> +	struct device *dev = &spi->dev;
> +	struct s6e63m0 *ctx;
> +	int ret;
> +
> +	ctx = devm_kzalloc(dev, sizeof(struct s6e63m0), GFP_KERNEL);
> +	if (!ctx)
> +		return -ENOMEM;
> +
> +	spi_set_drvdata(spi, ctx);
> +
> +	ctx->dev = dev;
> +	ctx->brightness = MAX_BRIGHTNESS;
> +	ctx->gamma_mode = GAMMA_MODE_22;
> +
> +	ret = s6e63m0_parse_dt(ctx);
> +	if (ret < 0)
> +		return ret;
> +
> +	ctx->supplies[0].supply = "vdd3";
> +	ctx->supplies[1].supply = "vci";
> +	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
> +				      ctx->supplies);
> +	if (ret < 0) {
> +		dev_err(dev, "failed to get regulators: %d\n", ret);
> +		return ret;
> +	}
> +
> +	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);


Shouldn't be set to GPIOD_OUT_HIGH? And declared as active low?


> +	if (IS_ERR(ctx->reset_gpio)) {
> +		dev_err(dev, "cannot get reset-gpios %ld\n",
> +			PTR_ERR(ctx->reset_gpio));
> +		return PTR_ERR(ctx->reset_gpio);
> +	}
> +
> +	spi->bits_per_word = 9;
> +	spi->mode = SPI_MODE_3;
> +	ret = spi_setup(spi);
> +	if (ret < 0) {
> +		dev_err(dev, "spi setup failed.\n");
> +		return ret;
> +	}
> +
> +	ret = device_create_file(dev, &dev_attr_gamma_mode);
> +	if (ret < 0)
> +		dev_err(dev, "failed to add sysfs entries\n");
> +
> +	drm_panel_init(&ctx->panel);
> +	ctx->panel.dev = dev;
> +	ctx->panel.funcs = &s6e63m0_drm_funcs;
> +
> +	ret = drm_panel_add(&ctx->panel);
> +	if (ret < 0)
> +		goto err_remove_file;
> +
> +	s6e63m0_backlight_register(ctx);
> +
> +	return 0;
> +
> +err_remove_file:
> +	device_remove_file(dev, &dev_attr_gamma_mode);
> +
> +	return ret;
> +}
> +
> +static int s6e63m0_remove(struct spi_device *spi)
> +{
> +	struct s6e63m0 *ctx = spi_get_drvdata(spi);
> +
> +	s6e63m0_power_off(ctx);


Power should be controlled by drm, of course the problem is that drm
still does not know that panel is during removal, maybe it will be fixed
in near future.  I guess you can remove the line above, and hope the
issue will be fixed in drm core.


Regards

Andrzej


> +	drm_panel_remove(&ctx->panel);
> +	device_remove_file(ctx->dev, &dev_attr_gamma_mode);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id s6e63m0_of_match[] = {
> +	{ .compatible = "samsung,s6e63m0" },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, s6e63m0_of_match);
> +
> +static struct spi_driver s6e63m0_driver = {
> +	.probe			= s6e63m0_probe,
> +	.remove			= s6e63m0_remove,
> +	.driver			= {
> +		.name		= "panel-samsung-s6e63m0",
> +		.of_match_table = s6e63m0_of_match,
> +	},
> +};
> +module_spi_driver(s6e63m0_driver);
> +
> +MODULE_AUTHOR("Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>");
> +MODULE_DESCRIPTION("s6e63m0 LCD Driver");
> +MODULE_LICENSE("GPL v2");



^ permalink raw reply	[flat|nested] 7+ messages in thread

* Re: [PATCH 2/2] drm/panel: Add driver for Samsung S6E63M0 panel
  2019-01-28 13:47   ` Andrzej Hajda
@ 2019-01-28 16:24     ` Paweł Chmiel
  0 siblings, 0 replies; 7+ messages in thread
From: Paweł Chmiel @ 2019-01-28 16:24 UTC (permalink / raw)
  To: Andrzej Hajda
  Cc: thierry.reding, mark.rutland, devicetree, airlied, linux-kernel,
	krzk, robh+dt, dri-devel, m.szyprowski

On poniedziałek, 28 stycznia 2019 14:47:41 CET Andrzej Hajda wrote:
> Hi Paweł,
> 
> Nice work.
> 
> I agree with most Sam's comments (maybe expect DRM_DEV_* logging - I am
> not sure if we need concurrent logging facility).
> 
> I'd like to add few more comments:
> 
> 
> 
> On 25.01.2019 17:46, Paweł Chmiel wrote:
> > This patch adds Samsung S6E63M0 AMOLED LCD panel driver, connected over
> > spi. It's based on already removed, non dt s6e63m0 driver and
> > panel-samsung-ld9040. There is possibility to choose one from 3
> > different gamma tables.
> > It can be found for example in some of Samsung Aries based phones.
> >
> > Signed-off-by: Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>
> > ---
> >  drivers/gpu/drm/panel/Kconfig                 |   7 +
> >  drivers/gpu/drm/panel/Makefile                |   1 +
> >  drivers/gpu/drm/panel/panel-samsung-s6e63m0.c | 712 ++++++++++++++++++
> >  3 files changed, 720 insertions(+)
> >  create mode 100644 drivers/gpu/drm/panel/panel-samsung-s6e63m0.c
> >
> > diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
> > index 3f3537719beb..4a4b64f74e70 100644
> > --- a/drivers/gpu/drm/panel/Kconfig
> > +++ b/drivers/gpu/drm/panel/Kconfig
> > @@ -82,6 +82,13 @@ config DRM_PANEL_SAMSUNG_LD9040
> >  	depends on OF && SPI
> >  	select VIDEOMODE_HELPERS
> >  
> > +config DRM_PANEL_SAMSUNG_S6E63M0
> > +	tristate "Samsung S6E63M0 RGB/SPI panel"
> > +	depends on OF
> > +	depends on SPI
> > +	depends on BACKLIGHT_CLASS_DEVICE
> > +	select VIDEOMODE_HELPERS
> > +
> >  config DRM_PANEL_LG_LG4573
> >  	tristate "LG4573 RGB/SPI panel"
> >  	depends on OF && SPI
> > diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
> > index 4396658a7996..3e5d53fdee47 100644
> > --- a/drivers/gpu/drm/panel/Makefile
> > +++ b/drivers/gpu/drm/panel/Makefile
> > @@ -14,6 +14,7 @@ obj-$(CONFIG_DRM_PANEL_RASPBERRYPI_TOUCHSCREEN) += panel-raspberrypi-touchscreen
> >  obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM68200) += panel-raydium-rm68200.o
> >  obj-$(CONFIG_DRM_PANEL_SAMSUNG_LD9040) += panel-samsung-ld9040.o
> >  obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6D16D0) += panel-samsung-s6d16d0.o
> > +obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E63M0) += panel-samsung-s6e63m0.o
> >  obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E3HA2) += panel-samsung-s6e3ha2.o
> >  obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E63J0X03) += panel-samsung-s6e63j0x03.o
> >  obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E8AA0) += panel-samsung-s6e8aa0.o
> > diff --git a/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c b/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c
> > new file mode 100644
> > index 000000000000..cb5c090621ad
> > --- /dev/null
> > +++ b/drivers/gpu/drm/panel/panel-samsung-s6e63m0.c
> > @@ -0,0 +1,712 @@
> > +// SPDX-License-Identifier: GPL-2.0+
> > +/*
> > + * S6E63M0 AMOLED LCD drm_panel driver.
> > + *
> > + * Copyright (C) 2019 Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>
> > + * Derived from drivers/gpu/drm/panel-samsung-ld9040.c
> > + *
> > + * Andrzej Hajda <a.hajda@samsung.com>
> > + *
> > + * This program is free software; you can redistribute it and/or modify
> > + * it under the terms of the GNU General Public License version 2 as
> > + * published by the Free Software Foundation.
> 
> 
> You do not need license 'body' if SPDX is in use.
> 
> 
> > + */
> > +
> > +#include <drm/drmP.h>
> > +#include <drm/drm_panel.h>
> > +
> > +#include <linux/backlight.h>
> > +#include <linux/gpio/consumer.h>
> > +#include <linux/regulator/consumer.h>
> > +#include <linux/spi/spi.h>
> > +
> > +#include <video/mipi_display.h>
> > +#include <video/of_videomode.h>
> > +#include <video/videomode.h>
> > +
> > +/* Manufacturer Command Set */
> > +#define MCS_STAND_BY_OFF                0x11
> 
> MIPI_DCS_EXIT_SLEEP_MODE
> 
> > +#define MCS_DISPLAY_ON                  0x29
> MIPI_DCS_SET_DISPLAY_ON
> > +#define MCS_ELVSS_ON                0xb1
> > +#define MCS_ACL_CTRL                0xc0
> > +#define MCS_DISPLAY_CONDITION   0xf2
> > +#define MCS_ETC_CONDITION           0xf6
> > +#define MCS_PANEL_CONDITION         0xF8
> > +#define MCS_GAMMA_CTRL              0xfa
> > +
> > +#define MAX_GAMMA_LEVEL             11
> 
> 
> GAMMA_LEVEL_COUNT or NUM_GAMMA_LEVELS ?
Ok, NUM_GAMMA_LEVELS looks better.
> 
> 
> > +#define GAMMA_TABLE_COUNT           23
> > +
> > +#define MAX_BRIGHTNESS              (MAX_GAMMA_LEVEL - 1)
> > +#define GAMMA_MODE_22               0
> > +#define GAMMA_MODE_19               1
> > +#define GAMMA_MODE_17               2
> > +
> > +/* array of gamma tables for gamma value 2.2 */
> > +static u8 const s6e63m0_gamma_22[MAX_GAMMA_LEVEL][GAMMA_TABLE_COUNT] = {
> > +	{ MCS_GAMMA_CTRL, 0x00,
> > +	  0x18, 0x08, 0x24, 0x78, 0xEC, 0x3D, 0xC8,
> > +	  0xC2, 0xB6, 0xC4, 0xC7, 0xB6, 0xD5, 0xD7,
> > +	  0xCC, 0x00, 0x39, 0x00, 0x36, 0x00, 0x51 },
> > +	{ MCS_GAMMA_CTRL, 0x00,
> > +	  0x18, 0x08, 0x24, 0x73, 0x4A, 0x3D, 0xC0,
> > +	  0xC2, 0xB1, 0xBB, 0xBE, 0xAC, 0xCE, 0xCF,
> > +	  0xC5, 0x00, 0x5D, 0x00, 0x5E, 0x00, 0x82 },
> > +	{ MCS_GAMMA_CTRL, 0x00,
> > +	  0x18, 0x08, 0x24, 0x70, 0x51, 0x3E, 0xBF,
> > +	  0xC1, 0xAF, 0xB9, 0xBC, 0xAB, 0xCC, 0xCC,
> > +	  0xC2, 0x00, 0x65, 0x00, 0x67, 0x00, 0x8D },
> > +	{ MCS_GAMMA_CTRL, 0x00,
> > +	  0x18, 0x08, 0x24, 0x6C, 0x54, 0x3A, 0xBC,
> > +	  0xBF, 0xAC, 0xB7, 0xBB, 0xA9, 0xC9, 0xC9,
> > +	  0xBE, 0x00, 0x71, 0x00, 0x73, 0x00, 0x9E },
> > +	{ MCS_GAMMA_CTRL, 0x00,
> > +	  0x18, 0x08, 0x24, 0x69, 0x54, 0x37, 0xBB,
> > +	  0xBE, 0xAC, 0xB4, 0xB7, 0xA6, 0xC7, 0xC8,
> > +	  0xBC, 0x00, 0x7B, 0x00, 0x7E, 0x00, 0xAB },
> > +	{ MCS_GAMMA_CTRL, 0x00,
> > +	  0x18, 0x08, 0x24, 0x66, 0x55, 0x34, 0xBA,
> > +	  0xBD, 0xAB, 0xB1, 0xB5, 0xA3, 0xC5, 0xC6,
> > +	  0xB9, 0x00, 0x85, 0x00, 0x88, 0x00, 0xBA },
> > +	{ MCS_GAMMA_CTRL, 0x00,
> > +	  0x18, 0x08, 0x24, 0x63, 0x53, 0x31, 0xB8,
> > +	  0xBC, 0xA9, 0xB0, 0xB5, 0xA2, 0xC4, 0xC4,
> > +	  0xB8, 0x00, 0x8B, 0x00, 0x8E, 0x00, 0xC2 },
> > +	{ MCS_GAMMA_CTRL, 0x00,
> > +	  0x18, 0x08, 0x24, 0x62, 0x54, 0x30, 0xB9,
> > +	  0xBB, 0xA9, 0xB0, 0xB3, 0xA1, 0xC1, 0xC3,
> > +	  0xB7, 0x00, 0x91, 0x00, 0x95, 0x00, 0xDA },
> > +	{ MCS_GAMMA_CTRL, 0x00,
> > +	  0x18, 0x08, 0x24, 0x66, 0x58, 0x34, 0xB6,
> > +	  0xBA, 0xA7, 0xAF, 0xB3, 0xA0, 0xC1, 0xC2,
> > +	  0xB7, 0x00, 0x97, 0x00, 0x9A, 0x00, 0xD1 },
> > +	{ MCS_GAMMA_CTRL, 0x00,
> > +	  0x18, 0x08, 0x24, 0x64, 0x56, 0x33, 0xB6,
> > +	  0xBA, 0xA8, 0xAC, 0xB1, 0x9D, 0xC1, 0xC1,
> > +	  0xB7, 0x00, 0x9C, 0x00, 0x9F, 0x00, 0xD6 },
> > +	{ MCS_GAMMA_CTRL, 0x00,
> > +	  0x18, 0x08, 0x24, 0x5f, 0x50, 0x2d, 0xB6,
> > +	  0xB9, 0xA7, 0xAd, 0xB1, 0x9f, 0xbe, 0xC0,
> > +	  0xB5, 0x00, 0xa0, 0x00, 0xa4, 0x00, 0xdb },
> > +};
> > +
> > +/* array of gamma tables for gamma value 1.9 */
> > +static u8 const s6e63m0_gamma_19[MAX_GAMMA_LEVEL][GAMMA_TABLE_COUNT] = {
> > +	{ MCS_GAMMA_CTRL, 0x00,
> > +	  0x18, 0x08, 0x24, 0x84, 0x45, 0x4F, 0xCA,
> > +	  0xCB, 0xBC, 0xC9, 0xCB, 0xBC, 0xDA, 0xDA,
> > +	  0xD0, 0x00, 0x35, 0x00, 0x34, 0x00, 0x4E },
> > +	{ MCS_GAMMA_CTRL, 0x00,
> > +	  0x18, 0x08, 0x24, 0x74, 0x60, 0x4A, 0xC3,
> > +	  0xC6, 0xB5, 0xBF, 0xC3, 0xB2, 0xD2, 0xD3,
> > +	  0xC8, 0x00, 0x5B, 0x00, 0x5B, 0x00, 0x81 },
> > +	{ MCS_GAMMA_CTRL, 0x00,
> > +	  0x18, 0x08, 0x24, 0x6F, 0x65, 0x46, 0xC2,
> > +	  0xC4, 0xB3, 0xBF, 0xC2, 0xB2, 0xCF, 0xD1,
> > +	  0xC6, 0x00, 0x64, 0x00, 0x64, 0x00, 0x8D },
> > +	{ MCS_GAMMA_CTRL, 0x00,
> > +	  0x18, 0x08, 0x24, 0x6E, 0x65, 0x45, 0xC0,
> > +	  0xC3, 0xB2, 0xBA, 0xBE, 0xAE, 0xCD, 0xD0,
> > +	  0xC4, 0x00, 0x70, 0x00, 0x70, 0x00, 0x9C },
> > +	{ MCS_GAMMA_CTRL, 0x00,
> > +	  0x18, 0x08, 0x24, 0x69, 0x64, 0x40, 0xBF,
> > +	  0xC1, 0xB0, 0xB9, 0xBE, 0xAD, 0xCB, 0xCD,
> > +	  0xC2, 0x00, 0x7A, 0x00, 0x7B, 0x00, 0xAA },
> > +	{ MCS_GAMMA_CTRL, 0x00,
> > +	  0x18, 0x08, 0x24, 0x68, 0x64, 0x3F, 0xBE,
> > +	  0xC0, 0xB0, 0xB6, 0xBB, 0xAB, 0xC8, 0xCB,
> > +	  0xBF, 0x00, 0x85, 0x00, 0x86, 0x00, 0xB8 },
> > +	{ MCS_GAMMA_CTRL, 0x00,
> > +	  0x18, 0x08, 0x24, 0x68, 0x64, 0x40, 0xBC,
> > +	  0xBF, 0xAF, 0xB4, 0xBA, 0xA9, 0xC8, 0xCA,
> > +	  0xBE, 0x00, 0x8B, 0x00, 0x8C, 0x00, 0xC0 },
> > +	{ MCS_GAMMA_CTRL, 0x00,
> > +	  0x18, 0x08, 0x24, 0x67, 0x64, 0x3F, 0xBB,
> > +	  0xBE, 0xAD, 0xB3, 0xB9, 0xA7, 0xC8, 0xC9,
> > +	  0xBE, 0x00, 0x90, 0x00, 0x92, 0x00, 0xC8 },
> > +	{ MCS_GAMMA_CTRL, 0x00,
> > +	  0x18, 0x08, 0x24, 0x63, 0x61, 0x3B, 0xBA,
> > +	  0xBE, 0xAC, 0xB3, 0xB8, 0xA7, 0xC6, 0xC8,
> > +	  0xBD, 0x00, 0x96, 0x00, 0x98, 0x00, 0xCF },
> > +	{ MCS_GAMMA_CTRL, 0x00,
> > +	  0x18, 0x08, 0x24, 0x61, 0x60, 0x39, 0xBB,
> > +	  0xBE, 0xAD, 0xB2, 0xB6, 0xA6, 0xC5, 0xC7,
> > +	  0xBD, 0x00, 0x9B, 0x00, 0x9E, 0x00, 0xD5 },
> > +	{ MCS_GAMMA_CTRL, 0x00,
> > +	  0x18, 0x08, 0x24, 0x61, 0x5F, 0x39, 0xBA,
> > +	  0xBD, 0xAD, 0xB1, 0xB6, 0xA5, 0xC4, 0xC5,
> > +	  0xBC, 0x00, 0xA0, 0x00, 0xA4, 0x00, 0xDB },
> > +};
> > +
> > +/* array of gamma tables for gamma value 1.7 */
> > +static u8 const s6e63m0_gamma_17[MAX_GAMMA_LEVEL][GAMMA_TABLE_COUNT] = {
> > +	{ MCS_GAMMA_CTRL, 0x00,
> > +	  0x18, 0x08, 0x24, 0x8F, 0x73, 0x63, 0xD1,
> > +	  0xD0, 0xC5, 0xCC, 0xD1, 0xC2, 0xDE, 0xE0,
> > +	  0xD6, 0x00, 0x39, 0x00, 0x36, 0x00, 0x51 },
> > +	{ MCS_GAMMA_CTRL, 0x00,
> > +	  0x18, 0x08, 0x24, 0x82, 0x7A, 0x5B, 0xC8,
> > +	  0xCB, 0xBD, 0xC5, 0xCA, 0xBA, 0xD6, 0xD8,
> > +	  0xCE, 0x00, 0x5D, 0x00, 0x5E, 0x00, 0x82 },
> > +	{ MCS_GAMMA_CTRL, 0x00,
> > +	  0x18, 0x08, 0x24, 0x81, 0x7B, 0x5D, 0xC6,
> > +	  0xCA, 0xBB, 0xC3, 0xC7, 0xB8, 0xD6, 0xD8,
> > +	  0xCD, 0x00, 0x65, 0x00, 0x67, 0x00, 0x8D },
> > +	{ MCS_GAMMA_CTRL, 0x00,
> > +	  0x18, 0x08, 0x24, 0x7B, 0x77, 0x58, 0xC3,
> > +	  0xC8, 0xB8, 0xC2, 0xC6, 0xB6, 0xD3, 0xD4,
> > +	  0xCA, 0x00, 0x71, 0x00, 0x73, 0x00, 0x9E },
> > +	{ MCS_GAMMA_CTRL, 0x00,
> > +	  0x18, 0x08, 0x24, 0x75, 0x77, 0x54, 0xC3,
> > +	  0xC7, 0xB7, 0xC0, 0xC3, 0xB4, 0xD1, 0xD3,
> > +	  0xC9, 0x00, 0x7B, 0x00, 0x7E, 0x00, 0xAB },
> > +	{ MCS_GAMMA_CTRL, 0x00,
> > +	  0x18, 0x08, 0x24, 0x72, 0x75, 0x51, 0xC2,
> > +	  0xC6, 0xB5, 0xBF, 0xC1, 0xB3, 0xCE, 0xD1,
> > +	  0xC6, 0x00, 0x85, 0x00, 0x88, 0x00, 0xBA },
> > +	{ MCS_GAMMA_CTRL, 0x00,
> > +	  0x18, 0x08, 0x24, 0x71, 0x73, 0x4F, 0xC2,
> > +	  0xC5, 0xB5, 0xBD, 0xC0, 0xB2, 0xCD, 0xD1,
> > +	  0xC5, 0x00, 0x8B, 0x00, 0x8E, 0x00, 0xC2 },
> > +	{ MCS_GAMMA_CTRL, 0x00,
> > +	  0x18, 0x08, 0x24, 0x71, 0x72, 0x4F, 0xC2,
> > +	  0xC4, 0xB5, 0xBB, 0xBF, 0xB0, 0xCC, 0xCF,
> > +	  0xC3, 0x00, 0x91, 0x00, 0x95, 0x00, 0xCA },
> > +	{ MCS_GAMMA_CTRL, 0x00,
> > +	  0x18, 0x08, 0x24, 0x72, 0x72, 0x50, 0xC0,
> > +	  0xC3, 0xB4, 0xB9, 0xBE, 0xAE, 0xCC, 0xCF,
> > +	  0xC4, 0x00, 0x97, 0x00, 0x9A, 0x00, 0xD1 },
> > +	{ MCS_GAMMA_CTRL, 0x00,
> > +	  0x18, 0x08, 0x24, 0x71, 0x71, 0x50, 0xBF,
> > +	  0xC2, 0xB2, 0xBA, 0xBE, 0xAE, 0xCB, 0xCD,
> > +	  0xC3, 0x00, 0x9C, 0x00, 0x9F, 0x00, 0xD6 },
> > +	{ MCS_GAMMA_CTRL, 0x00,
> > +	  0x18, 0x08, 0x24, 0x70, 0x70, 0x4F, 0xBF,
> > +	  0xC2, 0xB2, 0xB8, 0xBC, 0xAC, 0xCB, 0xCD,
> > +	  0xC3, 0x00, 0xA0, 0x00, 0xA4, 0x00, 0xDB },
> > +};
> > +
> > +#define S6E63M0_STATE_BIT_ENABLED       0
> > +
> > +struct s6e63m0 {
> > +	struct device *dev;
> > +	struct drm_panel panel;
> > +
> > +	struct regulator_bulk_data supplies[2];
> > +	struct gpio_desc *reset_gpio;
> > +	u32 power_on_delay;
> > +	u32 power_off_delay;
> > +	u32 reset_delay;
> > +	struct videomode vm;
> > +	u32 width_mm;
> > +	u32 height_mm;
> > +
> > +	unsigned long state;
> > +	unsigned int gamma_mode;
> > +	int brightness;
> > +
> > +	/* This field is tested by functions directly accessing bus before
> > +	 * transfer, transfer is skipped if it is set. In case of transfer
> > +	 * failure or unexpected response the field is set to error value.
> > +	 * Such construct allows to eliminate many checks in higher level
> > +	 * functions.
> > +	 */
> > +	int error;
> > +};
> > +
> > +static inline struct s6e63m0 *panel_to_s6e63m0(struct drm_panel *panel)
> > +{
> > +	return container_of(panel, struct s6e63m0, panel);
> > +}
> > +
> > +static int s6e63m0_clear_error(struct s6e63m0 *ctx)
> > +{
> > +	int ret = ctx->error;
> > +
> > +	ctx->error = 0;
> > +	return ret;
> > +}
> > +
> > +static int s6e63m0_spi_write_word(struct s6e63m0 *ctx, u16 data)
> > +{
> > +	struct spi_device *spi = to_spi_device(ctx->dev);
> > +	struct spi_transfer xfer = {
> > +		.len	= 2,
> > +		.tx_buf = &data,
> > +	};
> > +	struct spi_message msg;
> > +
> > +	spi_message_init(&msg);
> > +	spi_message_add_tail(&xfer, &msg);
> > +
> > +	return spi_sync(spi, &msg);
> > +}
> > +
> > +static void s6e63m0_dcs_write(struct s6e63m0 *ctx, const u8 *data, size_t len)
> > +{
> > +	int ret = 0;
> > +
> > +	if (ctx->error < 0 || len == 0)
> > +		return;
> > +
> > +	dev_dbg(ctx->dev, "writing dcs seq: %*ph\n", (int)len, data);
> > +	ret = s6e63m0_spi_write_word(ctx, *data);
> > +
> > +	while (!ret && --len) {
> > +		++data;
> > +		ret = s6e63m0_spi_write_word(ctx, *data | 0x100);
> > +	}
> > +
> > +	if (ret) {
> > +		dev_err(ctx->dev, "error %d writing dcs seq: %*ph\n", ret,
> > +			(int)len, data);
> > +		ctx->error = ret;
> > +	}
> > +
> > +	usleep_range(300, 310);
> > +}
> > +
> > +#define s6e63m0_dcs_write_seq_static(ctx, seq ...) \
> > +	({ \
> > +		static const u8 d[] = { seq }; \
> > +		s6e63m0_dcs_write(ctx, d, ARRAY_SIZE(d)); \
> > +	})
> > +
> > +static void s6e63m0_brightness_set(struct s6e63m0 *ctx)
> > +{
> > +	/* disable and set new gamma */
> > +	switch (ctx->gamma_mode) {
> > +	case GAMMA_MODE_22:
> > +		s6e63m0_dcs_write(ctx,
> > +				  s6e63m0_gamma_22[ctx->brightness],
> > +				  ARRAY_SIZE(s6e63m0_gamma_22[ctx->brightness])
> > +				  );
> > +		break;
> > +	case GAMMA_MODE_19:
> > +		s6e63m0_dcs_write(ctx,
> > +				  s6e63m0_gamma_19[ctx->brightness],
> > +				  ARRAY_SIZE(s6e63m0_gamma_19[ctx->brightness])
> > +				  );
> > +		break;
> > +	case GAMMA_MODE_17:
> > +		s6e63m0_dcs_write(ctx,
> > +				  s6e63m0_gamma_17[ctx->brightness],
> > +				  ARRAY_SIZE(s6e63m0_gamma_17[ctx->brightness])
> > +				  );
> > +		break;
> > +	default:
> > +		dev_info(ctx->dev,
> > +			 "gamma mode could be 0:2.2, 1:1.9 or 2:1.7.Assuming 2.2\n"
> > +			 );
> > +		s6e63m0_dcs_write(ctx,
> > +				  s6e63m0_gamma_22[ctx->brightness],
> > +				  ARRAY_SIZE(s6e63m0_gamma_22[ctx->brightness])
> > +				  );
> > +		break;
> > +	}
> > +
> > +	/* update gamma table. */
> > +	s6e63m0_dcs_write_seq_static(ctx, MCS_GAMMA_CTRL, 0x01);
> > +}
> > +
> > +static void s6e63m0_init(struct s6e63m0 *ctx)
> > +{
> > +	s6e63m0_dcs_write_seq_static(ctx, MCS_PANEL_CONDITION,
> > +				     0x01, 0x27, 0x27, 0x07, 0x07, 0x54, 0x9f,
> > +				     0x63, 0x86, 0x1a, 0x33, 0x0d, 0x00, 0x00);
> > +
> > +	s6e63m0_dcs_write_seq_static(ctx, MCS_DISPLAY_CONDITION,
> > +				     0x02, 0x03, 0x1c, 0x10, 0x10);
> > +	s6e63m0_dcs_write_seq_static(ctx, 0xf7,
> > +				     0x03, 0x00, 0x00);
> > +
> > +	s6e63m0_dcs_write_seq_static(ctx, MCS_GAMMA_CTRL,
> > +				     0x00, 0x18, 0x08, 0x24, 0x64, 0x56, 0x33,
> > +				     0xb6, 0xba, 0xa8, 0xac, 0xb1, 0x9d, 0xc1,
> > +				     0xc1, 0xb7, 0x00, 0x9c, 0x00, 0x9f, 0x00,
> > +				     0xd6);
> > +	s6e63m0_dcs_write_seq_static(ctx, MCS_GAMMA_CTRL,
> > +				     0x01);
> > +
> > +	s6e63m0_dcs_write_seq_static(ctx, MCS_ETC_CONDITION,
> > +				     0x00, 0x8c, 0x07);
> > +	s6e63m0_dcs_write_seq_static(ctx, 0xb3,
> > +				     0xc);
> > +
> > +	s6e63m0_dcs_write_seq_static(ctx, 0xb5,
> > +				     0x2c, 0x12, 0x0c, 0x0a, 0x10, 0x0e, 0x17,
> > +				     0x13, 0x1f, 0x1a, 0x2a, 0x24, 0x1f, 0x1b,
> > +				     0x1a, 0x17, 0x2b, 0x26, 0x22, 0x20, 0x3a,
> > +				     0x34, 0x30, 0x2c, 0x29, 0x26, 0x25, 0x23,
> > +				     0x21, 0x20, 0x1e, 0x1e);
> > +
> > +	s6e63m0_dcs_write_seq_static(ctx, 0xb6,
> > +				     0x00, 0x00, 0x11, 0x22, 0x33, 0x44, 0x44,
> > +				     0x44, 0x55, 0x55, 0x66, 0x66, 0x66, 0x66,
> > +				     0x66, 0x66);
> > +
> > +	s6e63m0_dcs_write_seq_static(ctx, 0xb7,
> > +				     0x2c, 0x12, 0x0c, 0x0a, 0x10, 0x0e, 0x17,
> > +				     0x13, 0x1f, 0x1a, 0x2a, 0x24, 0x1f, 0x1b,
> > +				     0x1a, 0x17, 0x2b, 0x26, 0x22, 0x20, 0x3a,
> > +				     0x34, 0x30, 0x2c, 0x29, 0x26, 0x25, 0x23,
> > +				     0x21, 0x20, 0x1e, 0x1e, 0x00, 0x00, 0x11,
> > +				     0x22, 0x33, 0x44, 0x44, 0x44, 0x55, 0x55,
> > +				     0x66, 0x66, 0x66, 0x66, 0x66, 0x66);
> > +
> > +	s6e63m0_dcs_write_seq_static(ctx, 0xb9,
> > +				     0x2c, 0x12, 0x0c, 0x0a, 0x10, 0x0e, 0x17,
> > +				     0x13, 0x1f, 0x1a, 0x2a, 0x24, 0x1f, 0x1b,
> > +				     0x1a, 0x17, 0x2b, 0x26, 0x22, 0x20, 0x3a,
> > +				     0x34, 0x30, 0x2c, 0x29, 0x26, 0x25, 0x23,
> > +				     0x21, 0x20, 0x1e, 0x1e);
> > +
> > +	s6e63m0_dcs_write_seq_static(ctx, 0xba,
> > +				     0x00, 0x00, 0x11, 0x22, 0x33, 0x44, 0x44,
> > +				     0x44, 0x55, 0x55, 0x66, 0x66, 0x66, 0x66,
> > +				     0x66, 0x66);
> > +
> > +	s6e63m0_dcs_write_seq_static(ctx, 0xc1,
> > +				     0x4d, 0x96, 0x1d, 0x00, 0x00, 0x01, 0xdf,
> > +				     0x00, 0x00, 0x03, 0x1f, 0x00, 0x00, 0x00,
> > +				     0x00, 0x00, 0x00, 0x00, 0x00, 0x03, 0x06,
> > +				     0x09, 0x0d, 0x0f, 0x12, 0x15, 0x18);
> > +
> > +	s6e63m0_dcs_write_seq_static(ctx, 0xb2,
> > +				     0x10, 0x10, 0x0b, 0x05);
> > +
> > +	s6e63m0_dcs_write_seq_static(ctx, MCS_ACL_CTRL,
> > +				     0x01);
> > +
> > +	s6e63m0_dcs_write_seq_static(ctx, MCS_ELVSS_ON,
> > +				     0x0b);
> > +
> > +	s6e63m0_dcs_write_seq_static(ctx, MCS_STAND_BY_OFF);
> > +
> > +	s6e63m0_dcs_write_seq_static(ctx, MCS_DISPLAY_ON);
> > +
> > +	s6e63m0_brightness_set(ctx);
> > +}
> > +
> > +static int s6e63m0_power_on(struct s6e63m0 *ctx)
> > +{
> > +	int ret;
> > +
> > +	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	msleep(ctx->power_on_delay);
> > +
> > +	gpiod_set_value(ctx->reset_gpio, 1);
> > +	msleep(ctx->reset_delay);
> > +	gpiod_set_value(ctx->reset_gpio, 0);
> > +	msleep(ctx->reset_delay);
> > +
> > +	return 0;
> > +}
> > +
> > +static int s6e63m0_power_off(struct s6e63m0 *ctx)
> > +{
> > +	msleep(ctx->power_off_delay);
> > +
> > +	return regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
> > +}
> > +
> > +static int s6e63m0_disable(struct drm_panel *panel)
> > +{
> > +	return 0;
> > +}
> > +
> > +static int s6e63m0_unprepare(struct drm_panel *panel)
> > +{
> > +	struct s6e63m0 *ctx = panel_to_s6e63m0(panel);
> > +
> > +	clear_bit(S6E63M0_STATE_BIT_ENABLED, &ctx->state);
> > +
> > +	s6e63m0_dcs_write_seq_static(ctx, MIPI_DCS_ENTER_SLEEP_MODE);
> > +
> > +	s6e63m0_clear_error(ctx);
> > +
> > +	return s6e63m0_power_off(ctx);
> > +}
> > +
> > +static int s6e63m0_prepare(struct drm_panel *panel)
> > +{
> > +	struct s6e63m0 *ctx = panel_to_s6e63m0(panel);
> > +	int ret;
> > +
> > +	ret = s6e63m0_power_on(ctx);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	s6e63m0_init(ctx);
> > +
> > +	ret = s6e63m0_clear_error(ctx);
> > +
> > +	if (ret < 0)
> > +		s6e63m0_unprepare(panel);
> > +	else
> > +		set_bit(S6E63M0_STATE_BIT_ENABLED, &ctx->state);
> > +
> > +	return ret;
> > +}
> > +
> > +static int s6e63m0_enable(struct drm_panel *panel)
> > +{
> > +	return 0;
> > +}
> > +
> > +static int s6e63m0_get_modes(struct drm_panel *panel)
> > +{
> > +	struct drm_connector *connector = panel->connector;
> > +	struct s6e63m0 *ctx = panel_to_s6e63m0(panel);
> > +	struct drm_display_mode *mode;
> > +
> > +	mode = drm_mode_create(connector->dev);
> > +	if (!mode) {
> > +		DRM_ERROR("failed to create a new display mode\n");
> > +		return 0;
> > +	}
> > +
> > +	drm_display_mode_from_videomode(&ctx->vm, mode);
> > +	mode->width_mm = ctx->width_mm;
> > +	mode->height_mm = ctx->height_mm;
> > +	connector->display_info.width_mm = mode->width_mm;
> > +	connector->display_info.height_mm = mode->height_mm;
> > +
> > +	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
> > +	mode->flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC;
> > +	drm_mode_probed_add(connector, mode);
> > +
> > +	return 1;
> > +}
> > +
> > +static const struct drm_panel_funcs s6e63m0_drm_funcs = {
> > +	.disable	= s6e63m0_disable,
> > +	.unprepare	= s6e63m0_unprepare,
> > +	.prepare	= s6e63m0_prepare,
> > +	.enable		= s6e63m0_enable,
> > +	.get_modes	= s6e63m0_get_modes,
> > +};
> > +
> > +static int s6e63m0_get_brightness(struct backlight_device *bd)
> > +{
> > +	return bd->props.brightness;
> > +}
> 
> 
> This callback can be omitted AFAIK.
> 
> 
> > +
> > +static int s6e63m0_set_brightness(struct backlight_device *bd)
> > +{
> > +	struct s6e63m0 *ctx = bl_get_data(bd);
> > +
> > +	bd->props.power = FB_BLANK_UNBLANK;
> > +	if (ctx->brightness != bd->props.brightness) {
> > +		ctx->brightness = bd->props.brightness;
> > +		if (test_bit(S6E63M0_STATE_BIT_ENABLED, &ctx->state))
> > +			s6e63m0_brightness_set(ctx);
> 
> 
> It is racy: one thread setting brightness, another disabling panel,
> nasty timings and we have attempt to send data to disabled panel.
> 
> I do not know backlight framework too much but it does not integrate
> well with drm's IMO.
> 
> I guess some solution would be to add mutex protecting from concurrent
> hw accesses from drm and backlight APIs.
Ok, will try to fix this. I've based my work on other (already existing) drivers,
so it looks like they have similar issue.
> 
> 
> > +	}
> > +
> > +	return s6e63m0_clear_error(ctx);
> > +}
> > +
> > +static const struct backlight_ops s6e63m0_backlight_ops = {
> > +	.get_brightness = s6e63m0_get_brightness,
> > +	.update_status	= s6e63m0_set_brightness,
> > +};
> > +
> > +static void s6e63m0_backlight_register(struct s6e63m0 *ctx)
> > +{
> > +	struct backlight_properties props = {
> > +		.type		= BACKLIGHT_RAW,
> > +		.brightness	= ctx->brightness,
> > +		.max_brightness = MAX_BRIGHTNESS
> > +	};
> > +	struct device *dev = ctx->dev;
> > +	struct backlight_device *bd;
> > +
> > +	bd = devm_backlight_device_register(dev, "panel", dev, ctx,
> > +					    &s6e63m0_backlight_ops, &props);
> > +	if (IS_ERR(bd))
> > +		dev_err(dev, "error registering backlight device (%ld)\n",
> > +			PTR_ERR(bd));
> > +}
> > +
> > +
> > +static ssize_t s6e63m0_sysfs_gamma_mode_show(struct device *dev,
> > +					     struct device_attribute *attr,
> > +					     char *buf)
> > +{
> > +	struct s6e63m0 *ctx = dev_get_drvdata(dev);
> > +	char temp[10];
> > +
> > +	switch (ctx->gamma_mode) {
> > +	case GAMMA_MODE_22:
> > +		sprintf(temp, "2.2 mode\n");
> > +		strcat(buf, temp);
> > +		break;
> > +	case GAMMA_MODE_19:
> > +		sprintf(temp, "1.9 mode\n");
> > +		strcat(buf, temp);
> > +		break;
> > +	case GAMMA_MODE_17:
> > +		sprintf(temp, "1.7 mode\n");
> > +		strcat(buf, temp);
> > +		break;
> > +	default:
> > +		dev_info(dev, "gamma mode could be 0:2.2, 1:1.9 or 2:1.7)n");
> > +		break;
> > +	}
> > +
> > +	return strlen(buf);
> > +}
> > +
> > +static ssize_t s6e63m0_sysfs_gamma_mode_store(struct device *dev,
> > +					      struct device_attribute *attr,
> > +					      const char *buf, size_t len)
> > +{
> > +	struct s6e63m0 *ctx = dev_get_drvdata(dev);
> > +	int rc;
> > +
> > +	rc = kstrtouint(buf, 0, &ctx->gamma_mode);
> > +	if (rc < 0)
> > +		return rc;
> > +
> > +	s6e63m0_brightness_set(ctx);
> > +	return len;
> > +}
> > +
> > +static DEVICE_ATTR(gamma_mode, 0644,
> > +		   s6e63m0_sysfs_gamma_mode_show,
> > +		   s6e63m0_sysfs_gamma_mode_store);
> 
> 
> I see this attribute was copied from vendor code, but it is still
> unclear how it was used there. Have you seen userspace code that used
> this property?
> 
No, i didn't saw (yet) any userspace code settings this. I've tried to make
this driver contain the same functionality as previous one.
I'll remove it and leave only 2.2 gamma.
> 
> > +
> > +static int s6e63m0_parse_dt(struct s6e63m0 *ctx)
> > +{
> > +	struct device *dev = ctx->dev;
> > +	struct device_node *np = dev->of_node;
> > +	int ret;
> > +
> > +	ret = of_get_videomode(np, &ctx->vm, 0);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	ret = of_property_read_u32(np, "power-on-delay", &ctx->power_on_delay);
> > +	if (ret) {
> > +		dev_info(ctx->dev, "using default power-on-delay of 25ms");
> > +		ctx->power_on_delay = 25;
> > +	}
> > +
> > +	ret = of_property_read_u32(np, "power-off-delay",
> > +				   &ctx->power_off_delay);
> > +	if (ret) {
> > +		dev_info(ctx->dev, "using default power-of-delay of 200ms");
> > +		ctx->power_off_delay = 200;
> > +	}
> > +
> > +	ret = of_property_read_u32(np, "reset-delay", &ctx->reset_delay);
> > +	if (ret) {
> > +		dev_info(ctx->dev, "using default reset-delay of 120ms");
> > +		ctx->reset_delay = 120;
> > +	}
> > +
> > +	of_property_read_u32(np, "panel-width-mm", &ctx->width_mm);
> > +	of_property_read_u32(np, "panel-height-mm", &ctx->height_mm);
> > +
> > +	return 0;
> > +}
> > +
> > +static int s6e63m0_probe(struct spi_device *spi)
> > +{
> > +	struct device *dev = &spi->dev;
> > +	struct s6e63m0 *ctx;
> > +	int ret;
> > +
> > +	ctx = devm_kzalloc(dev, sizeof(struct s6e63m0), GFP_KERNEL);
> > +	if (!ctx)
> > +		return -ENOMEM;
> > +
> > +	spi_set_drvdata(spi, ctx);
> > +
> > +	ctx->dev = dev;
> > +	ctx->brightness = MAX_BRIGHTNESS;
> > +	ctx->gamma_mode = GAMMA_MODE_22;
> > +
> > +	ret = s6e63m0_parse_dt(ctx);
> > +	if (ret < 0)
> > +		return ret;
> > +
> > +	ctx->supplies[0].supply = "vdd3";
> > +	ctx->supplies[1].supply = "vci";
> > +	ret = devm_regulator_bulk_get(dev, ARRAY_SIZE(ctx->supplies),
> > +				      ctx->supplies);
> > +	if (ret < 0) {
> > +		dev_err(dev, "failed to get regulators: %d\n", ret);
> > +		return ret;
> > +	}
> > +
> > +	ctx->reset_gpio = devm_gpiod_get(dev, "reset", GPIOD_OUT_LOW);
> 
> 
> Shouldn't be set to GPIOD_OUT_HIGH? And declared as active low?
This (and overall reset handling mentioned by Sam) will be fixed.
> 
> 
> > +	if (IS_ERR(ctx->reset_gpio)) {
> > +		dev_err(dev, "cannot get reset-gpios %ld\n",
> > +			PTR_ERR(ctx->reset_gpio));
> > +		return PTR_ERR(ctx->reset_gpio);
> > +	}
> > +
> > +	spi->bits_per_word = 9;
> > +	spi->mode = SPI_MODE_3;
> > +	ret = spi_setup(spi);
> > +	if (ret < 0) {
> > +		dev_err(dev, "spi setup failed.\n");
> > +		return ret;
> > +	}
> > +
> > +	ret = device_create_file(dev, &dev_attr_gamma_mode);
> > +	if (ret < 0)
> > +		dev_err(dev, "failed to add sysfs entries\n");
> > +
> > +	drm_panel_init(&ctx->panel);
> > +	ctx->panel.dev = dev;
> > +	ctx->panel.funcs = &s6e63m0_drm_funcs;
> > +
> > +	ret = drm_panel_add(&ctx->panel);
> > +	if (ret < 0)
> > +		goto err_remove_file;
> > +
> > +	s6e63m0_backlight_register(ctx);
> > +
> > +	return 0;
> > +
> > +err_remove_file:
> > +	device_remove_file(dev, &dev_attr_gamma_mode);
> > +
> > +	return ret;
> > +}
> > +
> > +static int s6e63m0_remove(struct spi_device *spi)
> > +{
> > +	struct s6e63m0 *ctx = spi_get_drvdata(spi);
> > +
> > +	s6e63m0_power_off(ctx);
> 
> 
> Power should be controlled by drm, of course the problem is that drm
> still does not know that panel is during removal, maybe it will be fixed
> in near future.  I guess you can remove the line above, and hope the
> issue will be fixed in drm core.
> 
> 
> Regards
> 
> Andrzej
> 
> 
> > +	drm_panel_remove(&ctx->panel);
> > +	device_remove_file(ctx->dev, &dev_attr_gamma_mode);
> > +
> > +	return 0;
> > +}
> > +
> > +static const struct of_device_id s6e63m0_of_match[] = {
> > +	{ .compatible = "samsung,s6e63m0" },
> > +	{ }
> > +};
> > +MODULE_DEVICE_TABLE(of, s6e63m0_of_match);
> > +
> > +static struct spi_driver s6e63m0_driver = {
> > +	.probe			= s6e63m0_probe,
> > +	.remove			= s6e63m0_remove,
> > +	.driver			= {
> > +		.name		= "panel-samsung-s6e63m0",
> > +		.of_match_table = s6e63m0_of_match,
> > +	},
> > +};
> > +module_spi_driver(s6e63m0_driver);
> > +
> > +MODULE_AUTHOR("Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>");
> > +MODULE_DESCRIPTION("s6e63m0 LCD Driver");
> > +MODULE_LICENSE("GPL v2");
> 
> 
> 
Thanks for review




^ permalink raw reply	[flat|nested] 7+ messages in thread

* Re: [PATCH 1/2] drm: panel: Add Samsung s6e63m0 panel documentation
  2019-01-25 16:46 [PATCH 1/2] drm: panel: Add Samsung s6e63m0 panel documentation Paweł Chmiel
  2019-01-25 16:46 ` [PATCH 2/2] drm/panel: Add driver for Samsung S6E63M0 panel Paweł Chmiel
@ 2019-01-26 20:55 ` Sam Ravnborg
  2019-01-26 21:23   ` Paweł Chmiel
  1 sibling, 1 reply; 7+ messages in thread
From: Sam Ravnborg @ 2019-01-26 20:55 UTC (permalink / raw)
  To: Paweł Chmiel
  Cc: thierry.reding, mark.rutland, devicetree, airlied,
	Jonathan Bakker, linux-kernel, krzk, robh+dt, dri-devel,
	m.szyprowski

Hi Pawel.

Thanks for the patch, some comments follows.
Please judge what comments you chose to follow, see this as suggestions.

According to Documentation/devicetree/bindings/submitting-patches.rst:

	The preferred subject prefix for binding patches is:
	"dt-bindings: <binding dir>: ..."

It would be a good idea to follow this practice in next revision.

On Fri, Jan 25, 2019 at 05:46:44PM +0100, Paweł Chmiel wrote:
> From: Jonathan Bakker <xc-racer2@live.ca>
> 
> This commit adds documentation for Samsung s6e63m0 AMOLED LCD panel
> driver.
> 
> Signed-off-by: Jonathan Bakker <xc-racer2@live.ca>
> Signed-off-by: Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>
> ---
>  .../display/panel/samsung,s6e63m0.txt         | 60 +++++++++++++++++++
>  1 file changed, 60 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/panel/samsung,s6e63m0.txt
> 
> diff --git a/Documentation/devicetree/bindings/display/panel/samsung,s6e63m0.txt b/Documentation/devicetree/bindings/display/panel/samsung,s6e63m0.txt
> new file mode 100644
> index 000000000000..4979200e2dd2
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/panel/samsung,s6e63m0.txt
> @@ -0,0 +1,60 @@
> +Samsung s6e63m0 AMOLED LCD panel
> +
> +Required properties:
> +  - compatible: "samsung,s6e63m0"
> +  - reset-gpio: GPIO spec for reset pin
The preferred name is reset-gpios (added 's')

> +  - vdd3-supply: VDD regulator
> +  - vci-supply: VCI regulator
> +  - display-timings: timings for the connected panel as described by [1]
Today, as is my best understanding, it is encouraged to specify the timing
in the actual driver and not in DT,

The example include a spi-max-frequency which is not mentioned?

> +
> +Optional properties:
> +  - reset-delay: Delay in ms after adjusting reset-gpio, default 120ms
> +  - power-on-delay: Delay in ms after powering on, default 25ms
> +  - power-off-delay: Delay in ms before powering off, default 200ms
> +  - panel-width-mm: physical panel width in mm
> +  - panel-height-mm: physical panel height in mm
Likewise these delays are also properties that today are included in the driver.

I cannot explain the background for this, this is just how things are done.

> +
> +The device node can contain one 'port' child node with one child
> +'endpoint' node, according to the bindings defined in [2]. This
> +node should describe panel's video bus.
> +
> +[1]: Documentation/devicetree/bindings/display/panel/display-timing.txt
> +[2]: Documentation/devicetree/bindings/media/video-interfaces.txt
> +
> +Example:
> +
> +		s6e63m0: display@0 {
> +			compatible = "samsung,s6e63m0";
> +			reg = <0>;
> +			reset-gpio = <&mp05 5 1>;
> +			vdd3-supply = <&ldo12_reg>;
> +			vci-supply = <&ldo11_reg>;
> +			spi-max-frequency = <1000000>;
> +
> +			power-on-delay = <0>;
> +			power-off-delay = <0>;
> +			reset-delay = <10>;
> +			panel-width-mm = <53>;
> +			panel-height-mm = <89>;
> +
> +			display-timings {
> +				timing-0 {
> +					/* 480x800@60Hz */
> +					clock-frequency = <25628040>;
> +					hactive = <480>;
> +					vactive = <800>;
> +					hfront-porch = <16>;
> +					hback-porch = <16>;
> +					hsync-len = <2>;
> +					vfront-porch = <28>;
> +					vback-porch = <1>;
> +					vsync-len = <2>;
> +				};
> +			};
> +
> +			port {
> +				lcd_ep: endpoint {
> +					remote-endpoint = <&fimd_ep>;
> +				};
> +			};
> +		};

	Sam

^ permalink raw reply	[flat|nested] 7+ messages in thread

* Re: [PATCH 1/2] drm: panel: Add Samsung s6e63m0 panel documentation
  2019-01-26 20:55 ` [PATCH 1/2] drm: panel: Add Samsung s6e63m0 panel documentation Sam Ravnborg
@ 2019-01-26 21:23   ` Paweł Chmiel
  0 siblings, 0 replies; 7+ messages in thread
From: Paweł Chmiel @ 2019-01-26 21:23 UTC (permalink / raw)
  To: Sam Ravnborg
  Cc: thierry.reding, mark.rutland, devicetree, airlied,
	Jonathan Bakker, linux-kernel, krzk, robh+dt, dri-devel,
	m.szyprowski

On sobota, 26 stycznia 2019 21:55:01 CET Sam Ravnborg wrote:
Hi
> Hi Pawel.
> 
> Thanks for the patch, some comments follows.
> Please judge what comments you chose to follow, see this as suggestions.
> 
> According to Documentation/devicetree/bindings/submitting-patches.rst:
> 
> 	The preferred subject prefix for binding patches is:
> 	"dt-bindings: <binding dir>: ..."
> 
> It would be a good idea to follow this practice in next revision.
I don't know how I forgot about this (will be fixed in next version).
> 
> On Fri, Jan 25, 2019 at 05:46:44PM +0100, Paweł Chmiel wrote:
> > From: Jonathan Bakker <xc-racer2@live.ca>
> > 
> > This commit adds documentation for Samsung s6e63m0 AMOLED LCD panel
> > driver.
> > 
> > Signed-off-by: Jonathan Bakker <xc-racer2@live.ca>
> > Signed-off-by: Paweł Chmiel <pawel.mikolaj.chmiel@gmail.com>
> > ---
> >  .../display/panel/samsung,s6e63m0.txt         | 60 +++++++++++++++++++
> >  1 file changed, 60 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/display/panel/samsung,s6e63m0.txt
> > 
> > diff --git a/Documentation/devicetree/bindings/display/panel/samsung,s6e63m0.txt b/Documentation/devicetree/bindings/display/panel/samsung,s6e63m0.txt
> > new file mode 100644
> > index 000000000000..4979200e2dd2
> > --- /dev/null
> > +++ b/Documentation/devicetree/bindings/display/panel/samsung,s6e63m0.txt
> > @@ -0,0 +1,60 @@
> > +Samsung s6e63m0 AMOLED LCD panel
> > +
> > +Required properties:
> > +  - compatible: "samsung,s6e63m0"
> > +  - reset-gpio: GPIO spec for reset pin
> The preferred name is reset-gpios (added 's')
Right, will be fixed.
> 
> > +  - vdd3-supply: VDD regulator
> > +  - vci-supply: VCI regulator
> > +  - display-timings: timings for the connected panel as described by [1]
> Today, as is my best understanding, it is encouraged to specify the timing
> in the actual driver and not in DT,
Ok, will hardcode them in driver. Currently those timings (which i had added to my device dts) were taken from original kernel sources.
Need to check if there are other devices (not only using mainline kernel) using this panel and what timings are they using (hope they're the same).
> 
> The example include a spi-max-frequency which is not mentioned?
spi-max-frequency shouldn't be here and will be removed.
> 
> > +
> > +Optional properties:
> > +  - reset-delay: Delay in ms after adjusting reset-gpio, default 120ms
> > +  - power-on-delay: Delay in ms after powering on, default 25ms
> > +  - power-off-delay: Delay in ms before powering off, default 200ms
> > +  - panel-width-mm: physical panel width in mm
> > +  - panel-height-mm: physical panel height in mm
> Likewise these delays are also properties that today are included in the driver.
> 
Need to check delays also (like timings).
> I cannot explain the background for this, this is just how things are done.
> 
> > +
> > +The device node can contain one 'port' child node with one child
> > +'endpoint' node, according to the bindings defined in [2]. This
> > +node should describe panel's video bus.
> > +
> > +[1]: Documentation/devicetree/bindings/display/panel/display-timing.txt
> > +[2]: Documentation/devicetree/bindings/media/video-interfaces.txt
> > +
> > +Example:
> > +
> > +		s6e63m0: display@0 {
> > +			compatible = "samsung,s6e63m0";
> > +			reg = <0>;
> > +			reset-gpio = <&mp05 5 1>;
> > +			vdd3-supply = <&ldo12_reg>;
> > +			vci-supply = <&ldo11_reg>;
> > +			spi-max-frequency = <1000000>;
> > +
> > +			power-on-delay = <0>;
> > +			power-off-delay = <0>;
> > +			reset-delay = <10>;
> > +			panel-width-mm = <53>;
> > +			panel-height-mm = <89>;
> > +
> > +			display-timings {
> > +				timing-0 {
> > +					/* 480x800@60Hz */
> > +					clock-frequency = <25628040>;
> > +					hactive = <480>;
> > +					vactive = <800>;
> > +					hfront-porch = <16>;
> > +					hback-porch = <16>;
> > +					hsync-len = <2>;
> > +					vfront-porch = <28>;
> > +					vback-porch = <1>;
> > +					vsync-len = <2>;
> > +				};
> > +			};
> > +
> > +			port {
> > +				lcd_ep: endpoint {
> > +					remote-endpoint = <&fimd_ep>;
> > +				};
> > +			};
> > +		};
> 
> 	Sam
> 
Thanks for review




^ permalink raw reply	[flat|nested] 7+ messages in thread

end of thread, other threads:[~2019-01-28 16:39 UTC | newest]

Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-01-25 16:46 [PATCH 1/2] drm: panel: Add Samsung s6e63m0 panel documentation Paweł Chmiel
2019-01-25 16:46 ` [PATCH 2/2] drm/panel: Add driver for Samsung S6E63M0 panel Paweł Chmiel
2019-01-26 21:41   ` Sam Ravnborg
2019-01-28 13:47   ` Andrzej Hajda
2019-01-28 16:24     ` Paweł Chmiel
2019-01-26 20:55 ` [PATCH 1/2] drm: panel: Add Samsung s6e63m0 panel documentation Sam Ravnborg
2019-01-26 21:23   ` Paweł Chmiel

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