From mboxrd@z Thu Jan  1 00:00:00 1970
From: =?UTF-8?q?Pawe=C5=82=20Chmiel?= <pawel.mikolaj.chmiel@gmail.com>
Subject: [PATCH 2/2] drm/panel: Add driver for Samsung S6E63M0 panel
Date: Fri, 25 Jan 2019 17:46:45 +0100
Message-ID: <20190125164645.19208-2-pawel.mikolaj.chmiel@gmail.com>
References: <20190125164645.19208-1-pawel.mikolaj.chmiel@gmail.com>
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In-Reply-To: <20190125164645.19208-1-pawel.mikolaj.chmiel@gmail.com>
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To: thierry.reding@gmail.com
Cc: airlied@linux.ie, daniel@ffwll.ch, robh+dt@kernel.org, mark.rutland@arm.com, m.szyprowski@samsung.com, krzk@kernel.org, dri-devel@lists.freedesktop.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, =?UTF-8?q?Pawe=C5=82=20Chmiel?= <pawel.mikolaj.chmiel@gmail.com>
List-Id: devicetree@vger.kernel.org

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