[PATCH 0/3] Add support for the s6e63j0x03 panel on Rinato board

[PATCH 0/3] Add support for the s6e63j0x03 panel on Rinato board

[Hoegeun Kwon]

Hi all,

The purpose of this patch is add support for s6e63j0x03 AMOLED panel
on the rinato board(Samsung Galaxy Gear 2).

The first and second patches are Add the binding document and panel
driver. The third patch is remove the unnecessary properties in the
rinato dts.

Best regards,
Hoegeun

Hoegeun Kwon (3):
  dt-bindings: Add support for samsung s6e63j0x03 panel binding
  drm/panel: Add support for s6e63j0x03 panel driver
  ARM: dts: exynos: Remove the display-timing and delay from rinato dts

 .../bindings/display/panel/samsung,s6e63j0x03.txt  |  24 +
 arch/arm/boot/dts/exynos3250-rinato.dts            |  22 -
 drivers/gpu/drm/panel/Kconfig                      |   7 +
 drivers/gpu/drm/panel/Makefile                     |   1 +
 drivers/gpu/drm/panel/panel-samsung-s6e63j0x03.c   | 491 +++++++++++++++++++++
 5 files changed, 523 insertions(+), 22 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/display/panel/samsung,s6e63j0x03.txt
 create mode 100644 drivers/gpu/drm/panel/panel-samsung-s6e63j0x03.c

-- 
1.9.1

[PATCH 1/3] dt-bindings: Add support for samsung s6e63j0x03 panel binding

[Hoegeun Kwon]

The Samsung s6e63j0x03 is a 1.63" 320x320 AMOLED panel connected using
MIPI-DSI interfaces.

Signed-off-by: Hoegeun Kwon <hoegeun.kwon@samsung.com>
---
 .../bindings/display/panel/samsung,s6e63j0x03.txt  | 24 ++++++++++++++++++++++
 1 file changed, 24 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/panel/samsung,s6e63j0x03.txt

diff --git a/Documentation/devicetree/bindings/display/panel/samsung,s6e63j0x03.txt b/Documentation/devicetree/bindings/display/panel/samsung,s6e63j0x03.txt
new file mode 100644
index 0000000..34b6e2a
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/panel/samsung,s6e63j0x03.txt
@@ -0,0 +1,24 @@
+Samsung S6E63J0X03 1.63" 320x320 AMOLED panel
+
+Required properties:
+  - compatible: "samsung,s6e63j0x03"
+  - reg: the virtual channel number of a DSI peripheral
+  - vdd3-supply: I/O voltage supply
+  - vci-supply: voltage supply for analog circuits
+  - reset-gpios: a GPIO spec for the reset pin (active high)
+  - te-gpios: a GPIO spec for the tearing effect synchronization signal
+    gpio pin (active high)
+
+Example:
+&dsi {
+	...
+
+	panel@0 {
+		compatible = "samsung,s6e63j0x03";
+		reg = <0>;
+		vdd3-supply = <&ldo16_reg>;
+		vci-supply = <&ldo20_reg>;
+		reset-gpios = <&gpe0 1 GPIO_ACTIVE_HIGH>;
+		te-gpios = <&gpx0 6 GPIO_ACTIVE_HIGH>;
+	};
+};
-- 
1.9.1

Re: [PATCH 1/3] dt-bindings: Add support for samsung s6e63j0x03 panel binding

[Andrzej Hajda]

Hi Hoegeun,

On 09.06.2017 06:59, Hoegeun Kwon wrote:
> The Samsung s6e63j0x03 is a 1.63" 320x320 AMOLED panel connected using
> MIPI-DSI interfaces.
>
> Signed-off-by: Hoegeun Kwon <hoegeun.kwon@samsung.com>
> ---
>  .../bindings/display/panel/samsung,s6e63j0x03.txt  | 24 ++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/panel/samsung,s6e63j0x03.txt
>
> diff --git a/Documentation/devicetree/bindings/display/panel/samsung,s6e63j0x03.txt b/Documentation/devicetree/bindings/display/panel/samsung,s6e63j0x03.txt
> new file mode 100644
> index 0000000..34b6e2a
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/panel/samsung,s6e63j0x03.txt
> @@ -0,0 +1,24 @@
> +Samsung S6E63J0X03 1.63" 320x320 AMOLED panel

Maybe it would be good to add info about interface, "MIPI DSI command
mode" I suppose.

> +
> +Required properties:
> +  - compatible: "samsung,s6e63j0x03"
> +  - reg: the virtual channel number of a DSI peripheral
> +  - vdd3-supply: I/O voltage supply
> +  - vci-supply: voltage supply for analog circuits
> +  - reset-gpios: a GPIO spec for the reset pin (active high)

Usually reset gpios is active low, also driver code suggests it, if it
is true please fix example also.

With above comments addressed:
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>

 --
Regards
Andrzej

> +  - te-gpios: a GPIO spec for the tearing effect synchronization signal
> +    gpio pin (active high)
> +
> +Example:
> +&dsi {
> +	...
> +
> +	panel@0 {
> +		compatible = "samsung,s6e63j0x03";
> +		reg = <0>;
> +		vdd3-supply = <&ldo16_reg>;
> +		vci-supply = <&ldo20_reg>;
> +		reset-gpios = <&gpe0 1 GPIO_ACTIVE_HIGH>;
> +		te-gpios = <&gpx0 6 GPIO_ACTIVE_HIGH>;
> +	};
> +};

Re: [PATCH 1/3] dt-bindings: Add support for samsung s6e63j0x03 panel binding

[Rob Herring]

On Fri, Jun 09, 2017 at 01:59:12PM +0900, Hoegeun Kwon wrote:
> The Samsung s6e63j0x03 is a 1.63" 320x320 AMOLED panel connected using
> MIPI-DSI interfaces.
> 
> Signed-off-by: Hoegeun Kwon <hoegeun.kwon@samsung.com>
> ---
>  .../bindings/display/panel/samsung,s6e63j0x03.txt  | 24 ++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/panel/samsung,s6e63j0x03.txt

Acked-by: Rob Herring <robh@kernel.org>

[PATCH 2/3] drm/panel: Add support for s6e63j0x03 panel driver

[Hoegeun Kwon]

This patch adds MIPI-DSI based S6E63J0X03 AMOLED LCD panel driver
which uses mipi_dsi bus to communicate with panel. The panel has
320×320 resolution in 1.63" physical panel. This panel is used in
Samsung Galaxy Gear 2.

Signed-off-by: Inki Dae <inki.dae@samsung.com>
Signed-off-by: Hyungwon Hwang <human.hwang@samsung.com>
Signed-off-by: Hoegeun Kwon <hoegeun.kwon@samsung.com>
---
 drivers/gpu/drm/panel/Kconfig                    |   7 +
 drivers/gpu/drm/panel/Makefile                   |   1 +
 drivers/gpu/drm/panel/panel-samsung-s6e63j0x03.c | 491 +++++++++++++++++++++++
 3 files changed, 499 insertions(+)
 create mode 100644 drivers/gpu/drm/panel/panel-samsung-s6e63j0x03.c

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 3e29a99..e47e56d 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -68,6 +68,13 @@ config DRM_PANEL_SAMSUNG_S6E3HA2
 	depends on DRM_MIPI_DSI
 	select VIDEOMODE_HELPERS
 
+config DRM_PANEL_SAMSUNG_S6E63J0X03
+	tristate "Samsung S6E63J0X03 DSI video mode panel"
+	depends on OF
+	depends on DRM_MIPI_DSI
+	depends on BACKLIGHT_CLASS_DEVICE
+	select VIDEOMODE_HELPERS
+
 config DRM_PANEL_SAMSUNG_S6E8AA0
 	tristate "Samsung S6E8AA0 DSI video mode panel"
 	depends on OF
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index 292b3c7..f028269 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -5,6 +5,7 @@ obj-$(CONFIG_DRM_PANEL_LG_LG4573) += panel-lg-lg4573.o
 obj-$(CONFIG_DRM_PANEL_PANASONIC_VVX10F034N00) += panel-panasonic-vvx10f034n00.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_LD9040) += panel-samsung-ld9040.o
 obj-$(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
 obj-$(CONFIG_DRM_PANEL_SHARP_LQ101R1SX01) += panel-sharp-lq101r1sx01.o
 obj-$(CONFIG_DRM_PANEL_SHARP_LS043T1LE01) += panel-sharp-ls043t1le01.o
diff --git a/drivers/gpu/drm/panel/panel-samsung-s6e63j0x03.c b/drivers/gpu/drm/panel/panel-samsung-s6e63j0x03.c
new file mode 100644
index 0000000..bf70a20
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-samsung-s6e63j0x03.c
@@ -0,0 +1,491 @@
+/*
+ * MIPI-DSI based S6E63J0X03 AMOLED lcd 1.63 inch panel driver.
+ *
+ * Copyright (c) 2014 Samsung Electronics Co., Ltd
+ *
+ * Inki Dae, <inki.dae@samsung.com>
+ * Hoegeun Kwon, <hoegeun.kwon@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_mipi_dsi.h>
+#include <drm/drm_panel.h>
+#include <linux/backlight.h>
+#include <linux/gpio.h>
+#include <linux/regulator/consumer.h>
+#include <video/mipi_display.h>
+
+#define MCS_LEVEL2_KEY		0xf0
+#define MCS_MTP_KEY		0xf1
+#define MCS_MTP_SET3		0xd4
+
+#define MIN_BRIGHTNESS		0
+#define MAX_BRIGHTNESS		100
+#define DEFAULT_BRIGHTNESS	80
+
+#define NUM_GAMMA_STEPS		9
+#define GAMMA_CMD_CNT		28
+
+struct s6e63j0x03 {
+	struct device *dev;
+	struct drm_panel panel;
+	struct backlight_device *bl_dev;
+
+	struct regulator_bulk_data supplies[2];
+	struct gpio_desc *reset_gpio;
+};
+
+static const unsigned char gamma_tbl[NUM_GAMMA_STEPS][GAMMA_CMD_CNT] = {
+	{	/* Gamma 10 */
+		MCS_MTP_SET3,
+		0x00, 0x00, 0x00, 0x7f, 0x7f, 0x7f, 0x52, 0x6b, 0x6f, 0x26,
+		0x28, 0x2d, 0x28, 0x26, 0x27, 0x33, 0x34, 0x32, 0x36, 0x36,
+		0x35, 0x00, 0xab, 0x00, 0xae, 0x00, 0xbf
+	},
+	{	/* gamma 30 */
+		MCS_MTP_SET3,
+		0x00, 0x00, 0x00, 0x70, 0x7f, 0x7f, 0x4e, 0x64, 0x69, 0x26,
+		0x27, 0x2a, 0x28, 0x29, 0x27, 0x31, 0x32, 0x31, 0x35, 0x34,
+		0x35, 0x00, 0xc4, 0x00, 0xca, 0x00, 0xdc
+	},
+	{	/* gamma 60 */
+		MCS_MTP_SET3,
+		0x00, 0x00, 0x00, 0x65, 0x7b, 0x7d, 0x5f, 0x67, 0x68, 0x2a,
+		0x28, 0x29, 0x28, 0x2a, 0x27, 0x31, 0x2f, 0x30, 0x34, 0x33,
+		0x34, 0x00, 0xd9, 0x00, 0xe4, 0x00, 0xf5
+	},
+	{	/* gamma 90 */
+		MCS_MTP_SET3,
+		0x00, 0x00, 0x00, 0x4d, 0x6f, 0x71, 0x67, 0x6a, 0x6c, 0x29,
+		0x28, 0x28, 0x28, 0x29, 0x27, 0x30, 0x2e, 0x30, 0x32, 0x31,
+		0x31, 0x00, 0xea, 0x00, 0xf6, 0x01, 0x09
+	},
+	{	/* gamma 120 */
+		MCS_MTP_SET3,
+		0x00, 0x00, 0x00, 0x3d, 0x66, 0x68, 0x69, 0x69, 0x69, 0x28,
+		0x28, 0x27, 0x28, 0x28, 0x27, 0x30, 0x2e, 0x2f, 0x31, 0x31,
+		0x30, 0x00, 0xf9, 0x01, 0x05, 0x01, 0x1b
+	},
+	{	/* gamma 150 */
+		MCS_MTP_SET3,
+		0x00, 0x00, 0x00, 0x31, 0x51, 0x53, 0x66, 0x66, 0x67, 0x28,
+		0x29, 0x27, 0x28, 0x27, 0x27, 0x2e, 0x2d, 0x2e, 0x31, 0x31,
+		0x30, 0x01, 0x04, 0x01, 0x11, 0x01, 0x29
+	},
+	{	/* gamma 200 */
+		MCS_MTP_SET3,
+		0x00, 0x00, 0x00, 0x2f, 0x4f, 0x51, 0x67, 0x65, 0x65, 0x29,
+		0x2a, 0x28, 0x27, 0x25, 0x26, 0x2d, 0x2c, 0x2c, 0x30, 0x30,
+		0x30, 0x01, 0x14, 0x01, 0x23, 0x01, 0x3b
+	},
+	{	/* gamma 240 */
+		MCS_MTP_SET3,
+		0x00, 0x00, 0x00, 0x2c, 0x4d, 0x50, 0x65, 0x63, 0x64, 0x2a,
+		0x2c, 0x29, 0x26, 0x24, 0x25, 0x2c, 0x2b, 0x2b, 0x30, 0x30,
+		0x30, 0x01, 0x1e, 0x01, 0x2f, 0x01, 0x47
+	},
+	{	/* gamma 300 */
+		MCS_MTP_SET3,
+		0x00, 0x00, 0x00, 0x38, 0x61, 0x64, 0x65, 0x63, 0x64, 0x28,
+		0x2a, 0x27, 0x26, 0x23, 0x25, 0x2b, 0x2b, 0x2a, 0x30, 0x2f,
+		0x30, 0x01, 0x2d, 0x01, 0x3f, 0x01, 0x57
+	}
+};
+
+static const unsigned char prepare_cmds1[][15] = {
+	{ 3, 0xf2, 0x1c, 0x28 },		/* porch_adjustment */
+	{ 4, 0xb5, 0x00, 0x02, 0x00 },		/* frame_freq */
+	{ 5, 0x2a, 0x00, 0x14, 0x01, 0x53 },	/* mem_addr_set_0 */
+	{ 5, 0x2b, 0x00, 0x00, 0x01, 0x3f },	/* mem_addr_set_1 */
+	{ 14, 0xf8, 0x08, 0x08, 0x08, 0x17,	/* ltps_timming_set_0_60hz */
+	      0x00, 0x2a, 0x02, 0x26,
+	      0x00, 0x00, 0x02, 0x00, 0x00 },
+	{ 2, 0xf7, 0x02 },			/* ltps_timming_set_1 */
+	{ 2, 0xb0, 0x01 },			/* param_pos_te_edge */
+	{ 2, 0xe2, 0x0f },			/* te_rising_edge */
+	{ 2, 0xb0, 0x00 },			/* param_pos_default */
+	{ 1, MIPI_DCS_EXIT_SLEEP_MODE },
+};
+
+static const  unsigned char prepare_cmds2[][4] = {
+	{ 3, 0xb1, 0x00, 0x09 },	/* elvss_cond */
+	{ 2, 0x36, 0x40 },		/* set_pos */
+	{ 2, 0x51, 0xff },		/* white_brightness_default */
+	{ 2, 0x53, 0x20 },		/* white_ctrl */
+	{ 2, 0x55, 0x00 },		/* acl_off */
+	{ 1, MIPI_DCS_SET_TEAR_ON },
+};
+
+
+static inline struct s6e63j0x03 *panel_to_s6e63j0x03(struct drm_panel *panel)
+{
+	return container_of(panel, struct s6e63j0x03, panel);
+}
+
+static inline ssize_t s6e63j0x03_dcs_write_seq(struct s6e63j0x03 *ctx,
+					const void *seq, size_t len)
+{
+	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
+
+	return mipi_dsi_dcs_write_buffer(dsi, seq, len);
+}
+
+static inline int s6e63j0x03_enable_lv2_command(struct s6e63j0x03 *ctx)
+{
+	unsigned char seq[] = { MCS_LEVEL2_KEY, 0x5a, 0x5a };
+
+	return s6e63j0x03_dcs_write_seq(ctx, seq, ARRAY_SIZE(seq));
+}
+
+static inline int s6e63j0x03_apply_mtp_key(struct s6e63j0x03 *ctx, bool on)
+{
+	unsigned char seq1[3] = { MCS_MTP_KEY, 0x5a, 0x5a };
+	unsigned char seq2[3] = { MCS_MTP_KEY, 0xa5, 0xa5 };
+
+	return s6e63j0x03_dcs_write_seq(ctx, on ? seq1 : seq2,
+					ARRAY_SIZE(seq1));
+}
+
+static int s6e63j0x03_power_on(struct s6e63j0x03 *ctx)
+{
+	int ret;
+
+	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+	if (ret < 0)
+		return ret;
+
+	msleep(30);
+
+	gpiod_set_value(ctx->reset_gpio, 0);
+	usleep_range(1000, 2000);
+	gpiod_set_value(ctx->reset_gpio, 1);
+	usleep_range(5000, 6000);
+
+	return 0;
+}
+
+static int s6e63j0x03_power_off(struct s6e63j0x03 *ctx)
+{
+	int ret;
+
+	gpiod_set_value(ctx->reset_gpio, 0);
+
+	ret = regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static int s6e63j0x03_get_brightness(struct backlight_device *bl_dev)
+{
+	return bl_dev->props.brightness;
+}
+
+static unsigned int s6e63j0x03_get_brightness_index(unsigned int brightness)
+{
+	unsigned int index;
+
+	index = brightness / (MAX_BRIGHTNESS / NUM_GAMMA_STEPS);
+
+	if (index >= NUM_GAMMA_STEPS)
+		index = NUM_GAMMA_STEPS - 1;
+
+	return index;
+}
+
+static int s6e63j0x03_update_gamma(struct s6e63j0x03 *ctx,
+					unsigned int brightness)
+{
+	struct backlight_device *bl_dev = ctx->bl_dev;
+	unsigned int index = s6e63j0x03_get_brightness_index(brightness);
+	int ret;
+
+	ret = s6e63j0x03_apply_mtp_key(ctx, true);
+	if (ret < 0)
+		return ret;
+
+	ret = s6e63j0x03_dcs_write_seq(ctx, gamma_tbl[index], GAMMA_CMD_CNT);
+	if (ret < 0)
+		return ret;
+
+	ret = s6e63j0x03_apply_mtp_key(ctx, false);
+	if (ret < 0)
+		return ret;
+
+	bl_dev->props.brightness = brightness;
+
+	return 0;
+}
+
+static int s6e63j0x03_set_brightness(struct backlight_device *bl_dev)
+{
+	struct s6e63j0x03 *ctx = (struct s6e63j0x03 *)bl_get_data(bl_dev);
+	unsigned int brightness = bl_dev->props.brightness;
+	int ret;
+
+	if (brightness < MIN_BRIGHTNESS ||
+		brightness > bl_dev->props.max_brightness) {
+		dev_err(ctx->dev, "Invalid brightness: %u\n", brightness);
+		return -EINVAL;
+	}
+
+	if (bl_dev->props.power > FB_BLANK_NORMAL)
+		return -EPERM;
+
+	ret = s6e63j0x03_update_gamma(ctx, brightness);
+	if (ret < 0)
+		return ret;
+
+	return 0;
+}
+
+static const struct backlight_ops s6e63j0x03_bl_ops = {
+	.get_brightness = s6e63j0x03_get_brightness,
+	.update_status = s6e63j0x03_set_brightness,
+};
+
+static int s6e63j0x03_disable(struct drm_panel *panel)
+{
+	struct s6e63j0x03 *ctx = panel_to_s6e63j0x03(panel);
+	struct backlight_device *bl_dev = ctx->bl_dev;
+	u8 seq[] = { MIPI_DCS_SET_DISPLAY_OFF };
+	int ret;
+
+	ret = s6e63j0x03_dcs_write_seq(ctx, seq, ARRAY_SIZE(seq));
+	if (ret > 0)
+		bl_dev->props.power = FB_BLANK_NORMAL;
+
+	return 0;
+}
+
+static int s6e63j0x03_unprepare(struct drm_panel *panel)
+{
+	struct s6e63j0x03 *ctx = panel_to_s6e63j0x03(panel);
+	struct backlight_device *bl_dev = ctx->bl_dev;
+	u8 seq[] = { MIPI_DCS_ENTER_SLEEP_MODE };
+	int ret;
+
+	ret = s6e63j0x03_dcs_write_seq(ctx, seq, ARRAY_SIZE(seq));
+	if (ret < 0)
+		return ret;
+
+	msleep(120);
+
+	ret = s6e63j0x03_power_off(ctx);
+	if (ret < 0)
+		return ret;
+
+	bl_dev->props.power = FB_BLANK_POWERDOWN;
+
+	return 0;
+}
+
+static int s6e63j0x03_prepare(struct drm_panel *panel)
+{
+	struct s6e63j0x03 *ctx = panel_to_s6e63j0x03(panel);
+	struct backlight_device *bl_dev = ctx->bl_dev;
+	int ret;
+	int i;
+
+	ret = s6e63j0x03_power_on(ctx);
+	if (ret < 0)
+		return ret;
+
+	ret = s6e63j0x03_enable_lv2_command(ctx);
+	if (ret < 0)
+		return ret;
+
+	ret = s6e63j0x03_apply_mtp_key(ctx, true);
+	if (ret < 0)
+		return ret;
+
+	for (i = 0; i < ARRAY_SIZE(prepare_cmds1); i++) {
+		ret = s6e63j0x03_dcs_write_seq(ctx, &prepare_cmds1[i][1],
+						prepare_cmds1[i][0]);
+		if (ret < 0)
+			return ret;
+	}
+
+	msleep(120);
+
+	for (i = 0; i < ARRAY_SIZE(prepare_cmds2); i++) {
+		ret = s6e63j0x03_dcs_write_seq(ctx, &prepare_cmds2[i][1],
+						prepare_cmds2[i][0]);
+		if (ret < 0)
+			return ret;
+	}
+
+	ret = s6e63j0x03_apply_mtp_key(ctx, false);
+	if (ret < 0)
+		return ret;
+
+	bl_dev->props.power = FB_BLANK_NORMAL;
+
+	return 0;
+}
+
+static int s6e63j0x03_enable(struct drm_panel *panel)
+{
+	struct s6e63j0x03 *ctx = panel_to_s6e63j0x03(panel);
+	struct backlight_device *bl_dev = ctx->bl_dev;
+	u8 seq[] = { MIPI_DCS_SET_DISPLAY_ON };
+	int ret;
+
+	ret = s6e63j0x03_dcs_write_seq(ctx, seq, ARRAY_SIZE(seq));
+	if (ret > 0)
+		bl_dev->props.power = FB_BLANK_UNBLANK;
+
+	return 0;
+}
+
+static const struct drm_display_mode default_mode = {
+	.clock = 4644,
+	.hdisplay = 320,
+	.hsync_start = 320 + 1,
+	.hsync_end = 320 + 1 + 1,
+	.htotal = 320 + 1 + 1 + 1,
+	.vdisplay = 320,
+	.vsync_start = 320 + 150,
+	.vsync_end = 320 + 150 + 1,
+	.vtotal = 320 + 150 + 1 + 2,
+	.vrefresh = 30,
+	.flags = 0,
+};
+
+static int s6e63j0x03_get_modes(struct drm_panel *panel)
+{
+	struct drm_connector *connector = panel->connector;
+	struct drm_display_mode *mode;
+
+	mode = drm_mode_duplicate(panel->drm, &default_mode);
+	if (!mode) {
+		DRM_ERROR("failed to add mode %ux%ux@%u\n",
+				default_mode.hdisplay, default_mode.vdisplay,
+				default_mode.vrefresh);
+		return -ENOMEM;
+	}
+
+	drm_mode_set_name(mode);
+
+	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
+	drm_mode_probed_add(connector, mode);
+
+	connector->display_info.width_mm = 29;
+	connector->display_info.height_mm = 29;
+
+	return 1;
+}
+
+static const struct drm_panel_funcs s6e63j0x03_funcs = {
+	.disable = s6e63j0x03_disable,
+	.unprepare = s6e63j0x03_unprepare,
+	.prepare = s6e63j0x03_prepare,
+	.enable = s6e63j0x03_enable,
+	.get_modes = s6e63j0x03_get_modes,
+};
+
+static int s6e63j0x03_probe(struct mipi_dsi_device *dsi)
+{
+	struct device *dev = &dsi->dev;
+	struct s6e63j0x03 *ctx;
+	int ret;
+
+	ctx = devm_kzalloc(dev, sizeof(struct s6e63j0x03), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	mipi_dsi_set_drvdata(dsi, ctx);
+
+	ctx->dev = dev;
+
+	dsi->lanes = 1;
+	dsi->format = MIPI_DSI_FMT_RGB888;
+	dsi->mode_flags = MIPI_DSI_MODE_EOT_PACKET | MIPI_DSI_MODE_VIDEO_BURST;
+
+	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_HIGH);
+	if (IS_ERR(ctx->reset_gpio)) {
+		dev_err(dev, "cannot get reset-gpio: %ld\n",
+				PTR_ERR(ctx->reset_gpio));
+		return PTR_ERR(ctx->reset_gpio);
+	}
+
+	drm_panel_init(&ctx->panel);
+	ctx->panel.dev = dev;
+	ctx->panel.funcs = &s6e63j0x03_funcs;
+
+	ctx->bl_dev = backlight_device_register("s6e63j0x03", dev, ctx,
+						&s6e63j0x03_bl_ops, NULL);
+	if (IS_ERR(ctx->bl_dev)) {
+		dev_err(dev, "failed to register backlight device\n");
+		return PTR_ERR(ctx->bl_dev);
+	}
+
+	ctx->bl_dev->props.max_brightness = MAX_BRIGHTNESS;
+	ctx->bl_dev->props.brightness = DEFAULT_BRIGHTNESS;
+	ctx->bl_dev->props.power = FB_BLANK_POWERDOWN;
+
+	ret = drm_panel_add(&ctx->panel);
+	if (ret < 0)
+		goto unregister_backlight;
+
+	ret = mipi_dsi_attach(dsi);
+	if (ret < 0)
+		goto remove_panel;
+
+	return ret;
+
+remove_panel:
+	drm_panel_remove(&ctx->panel);
+
+unregister_backlight:
+	backlight_device_unregister(ctx->bl_dev);
+
+	return ret;
+}
+
+static int s6e63j0x03_remove(struct mipi_dsi_device *dsi)
+{
+	struct s6e63j0x03 *ctx = mipi_dsi_get_drvdata(dsi);
+
+	mipi_dsi_detach(dsi);
+	drm_panel_remove(&ctx->panel);
+
+	backlight_device_unregister(ctx->bl_dev);
+
+	return 0;
+}
+
+static const struct of_device_id s6e63j0x03_of_match[] = {
+	{ .compatible = "samsung,s6e63j0x03" },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, s6e63j0x03_of_match);
+
+static struct mipi_dsi_driver s6e63j0x03_driver = {
+	.probe = s6e63j0x03_probe,
+	.remove = s6e63j0x03_remove,
+	.driver = {
+		.name = "panel_samsung_s6e63j0x03",
+		.of_match_table = s6e63j0x03_of_match,
+	},
+};
+module_mipi_dsi_driver(s6e63j0x03_driver);
+
+MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
+MODULE_AUTHOR("Hoegeun Kwon <hoegeun.kwon@samsung.com>");
+MODULE_DESCRIPTION("MIPI-DSI based s6e63j0x03 AMOLED LCD Panel Driver");
+MODULE_LICENSE("GPL v2");
-- 
1.9.1

Re: [PATCH 2/3] drm/panel: Add support for s6e63j0x03 panel driver

[Andrzej Hajda]

Hi Hoegeun,

Nice to see patches completing support for mainlined platforms.

On 09.06.2017 06:59, Hoegeun Kwon wrote:
> This patch adds MIPI-DSI based S6E63J0X03 AMOLED LCD panel driver
> which uses mipi_dsi bus to communicate with panel. The panel has
> 320×320 resolution in 1.63" physical panel. This panel is used in
> Samsung Galaxy Gear 2.
>
> Signed-off-by: Inki Dae <inki.dae@samsung.com>
> Signed-off-by: Hyungwon Hwang <human.hwang@samsung.com>
> Signed-off-by: Hoegeun Kwon <hoegeun.kwon@samsung.com>
> ---
>  drivers/gpu/drm/panel/Kconfig                    |   7 +
>  drivers/gpu/drm/panel/Makefile                   |   1 +
>  drivers/gpu/drm/panel/panel-samsung-s6e63j0x03.c | 491 +++++++++++++++++++++++
>  3 files changed, 499 insertions(+)
>  create mode 100644 drivers/gpu/drm/panel/panel-samsung-s6e63j0x03.c
>
> diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
> index 3e29a99..e47e56d 100644
> --- a/drivers/gpu/drm/panel/Kconfig
> +++ b/drivers/gpu/drm/panel/Kconfig
> @@ -68,6 +68,13 @@ config DRM_PANEL_SAMSUNG_S6E3HA2
>  	depends on DRM_MIPI_DSI
>  	select VIDEOMODE_HELPERS
>  
> +config DRM_PANEL_SAMSUNG_S6E63J0X03
> +	tristate "Samsung S6E63J0X03 DSI video mode panel"

I suspect it is command mode panel, isn't?

> +	depends on OF
> +	depends on DRM_MIPI_DSI
> +	depends on BACKLIGHT_CLASS_DEVICE
> +	select VIDEOMODE_HELPERS
> +
>  config DRM_PANEL_SAMSUNG_S6E8AA0
>  	tristate "Samsung S6E8AA0 DSI video mode panel"
>  	depends on OF
> diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
> index 292b3c7..f028269 100644
> --- a/drivers/gpu/drm/panel/Makefile
> +++ b/drivers/gpu/drm/panel/Makefile
> @@ -5,6 +5,7 @@ obj-$(CONFIG_DRM_PANEL_LG_LG4573) += panel-lg-lg4573.o
>  obj-$(CONFIG_DRM_PANEL_PANASONIC_VVX10F034N00) += panel-panasonic-vvx10f034n00.o
>  obj-$(CONFIG_DRM_PANEL_SAMSUNG_LD9040) += panel-samsung-ld9040.o
>  obj-$(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
>  obj-$(CONFIG_DRM_PANEL_SHARP_LQ101R1SX01) += panel-sharp-lq101r1sx01.o
>  obj-$(CONFIG_DRM_PANEL_SHARP_LS043T1LE01) += panel-sharp-ls043t1le01.o
> diff --git a/drivers/gpu/drm/panel/panel-samsung-s6e63j0x03.c b/drivers/gpu/drm/panel/panel-samsung-s6e63j0x03.c
> new file mode 100644
> index 0000000..bf70a20
> --- /dev/null
> +++ b/drivers/gpu/drm/panel/panel-samsung-s6e63j0x03.c
> @@ -0,0 +1,491 @@
> +/*
> + * MIPI-DSI based S6E63J0X03 AMOLED lcd 1.63 inch panel driver.
> + *
> + * Copyright (c) 2014 Samsung Electronics Co., Ltd

Maybe range 2014-2017 would be better.

> + *
> + * Inki Dae, <inki.dae@samsung.com>
> + * Hoegeun Kwon, <hoegeun.kwon@samsung.com>

No comma after name.

> + *
> + * 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_mipi_dsi.h>
> +#include <drm/drm_panel.h>
> +#include <linux/backlight.h>
> +#include <linux/gpio.h>

Probably linux/gpio/consumer.h should be used here.

> +#include <linux/regulator/consumer.h>
> +#include <video/mipi_display.h>
> +
> +#define MCS_LEVEL2_KEY		0xf0
> +#define MCS_MTP_KEY		0xf1
> +#define MCS_MTP_SET3		0xd4
> +
> +#define MIN_BRIGHTNESS		0
> +#define MAX_BRIGHTNESS		100
> +#define DEFAULT_BRIGHTNESS	80
> +
> +#define NUM_GAMMA_STEPS		9
> +#define GAMMA_CMD_CNT		28
> +
> +struct s6e63j0x03 {
> +	struct device *dev;
> +	struct drm_panel panel;
> +	struct backlight_device *bl_dev;
> +
> +	struct regulator_bulk_data supplies[2];
> +	struct gpio_desc *reset_gpio;
> +};
> +
> +static const unsigned char gamma_tbl[NUM_GAMMA_STEPS][GAMMA_CMD_CNT] = {
> +	{	/* Gamma 10 */
> +		MCS_MTP_SET3,
> +		0x00, 0x00, 0x00, 0x7f, 0x7f, 0x7f, 0x52, 0x6b, 0x6f, 0x26,
> +		0x28, 0x2d, 0x28, 0x26, 0x27, 0x33, 0x34, 0x32, 0x36, 0x36,
> +		0x35, 0x00, 0xab, 0x00, 0xae, 0x00, 0xbf
> +	},
> +	{	/* gamma 30 */
> +		MCS_MTP_SET3,
> +		0x00, 0x00, 0x00, 0x70, 0x7f, 0x7f, 0x4e, 0x64, 0x69, 0x26,
> +		0x27, 0x2a, 0x28, 0x29, 0x27, 0x31, 0x32, 0x31, 0x35, 0x34,
> +		0x35, 0x00, 0xc4, 0x00, 0xca, 0x00, 0xdc
> +	},
> +	{	/* gamma 60 */
> +		MCS_MTP_SET3,
> +		0x00, 0x00, 0x00, 0x65, 0x7b, 0x7d, 0x5f, 0x67, 0x68, 0x2a,
> +		0x28, 0x29, 0x28, 0x2a, 0x27, 0x31, 0x2f, 0x30, 0x34, 0x33,
> +		0x34, 0x00, 0xd9, 0x00, 0xe4, 0x00, 0xf5
> +	},
> +	{	/* gamma 90 */
> +		MCS_MTP_SET3,
> +		0x00, 0x00, 0x00, 0x4d, 0x6f, 0x71, 0x67, 0x6a, 0x6c, 0x29,
> +		0x28, 0x28, 0x28, 0x29, 0x27, 0x30, 0x2e, 0x30, 0x32, 0x31,
> +		0x31, 0x00, 0xea, 0x00, 0xf6, 0x01, 0x09
> +	},
> +	{	/* gamma 120 */
> +		MCS_MTP_SET3,
> +		0x00, 0x00, 0x00, 0x3d, 0x66, 0x68, 0x69, 0x69, 0x69, 0x28,
> +		0x28, 0x27, 0x28, 0x28, 0x27, 0x30, 0x2e, 0x2f, 0x31, 0x31,
> +		0x30, 0x00, 0xf9, 0x01, 0x05, 0x01, 0x1b
> +	},
> +	{	/* gamma 150 */
> +		MCS_MTP_SET3,
> +		0x00, 0x00, 0x00, 0x31, 0x51, 0x53, 0x66, 0x66, 0x67, 0x28,
> +		0x29, 0x27, 0x28, 0x27, 0x27, 0x2e, 0x2d, 0x2e, 0x31, 0x31,
> +		0x30, 0x01, 0x04, 0x01, 0x11, 0x01, 0x29
> +	},
> +	{	/* gamma 200 */
> +		MCS_MTP_SET3,
> +		0x00, 0x00, 0x00, 0x2f, 0x4f, 0x51, 0x67, 0x65, 0x65, 0x29,
> +		0x2a, 0x28, 0x27, 0x25, 0x26, 0x2d, 0x2c, 0x2c, 0x30, 0x30,
> +		0x30, 0x01, 0x14, 0x01, 0x23, 0x01, 0x3b
> +	},
> +	{	/* gamma 240 */
> +		MCS_MTP_SET3,
> +		0x00, 0x00, 0x00, 0x2c, 0x4d, 0x50, 0x65, 0x63, 0x64, 0x2a,
> +		0x2c, 0x29, 0x26, 0x24, 0x25, 0x2c, 0x2b, 0x2b, 0x30, 0x30,
> +		0x30, 0x01, 0x1e, 0x01, 0x2f, 0x01, 0x47
> +	},
> +	{	/* gamma 300 */
> +		MCS_MTP_SET3,
> +		0x00, 0x00, 0x00, 0x38, 0x61, 0x64, 0x65, 0x63, 0x64, 0x28,
> +		0x2a, 0x27, 0x26, 0x23, 0x25, 0x2b, 0x2b, 0x2a, 0x30, 0x2f,
> +		0x30, 0x01, 0x2d, 0x01, 0x3f, 0x01, 0x57
> +	}
> +};
> +
> +static const unsigned char prepare_cmds1[][15] = {
> +	{ 3, 0xf2, 0x1c, 0x28 },		/* porch_adjustment */
> +	{ 4, 0xb5, 0x00, 0x02, 0x00 },		/* frame_freq */
> +	{ 5, 0x2a, 0x00, 0x14, 0x01, 0x53 },	/* mem_addr_set_0 */
> +	{ 5, 0x2b, 0x00, 0x00, 0x01, 0x3f },	/* mem_addr_set_1 */
Two commands above are realized by mipi_dsi_dcs_set_column_address and
mipi_dsi_dcs_set_page_address helpers.
> +	{ 14, 0xf8, 0x08, 0x08, 0x08, 0x17,	/* ltps_timming_set_0_60hz */
> +	      0x00, 0x2a, 0x02, 0x26,
> +	      0x00, 0x00, 0x02, 0x00, 0x00 },
> +	{ 2, 0xf7, 0x02 },			/* ltps_timming_set_1 */
> +	{ 2, 0xb0, 0x01 },			/* param_pos_te_edge */
> +	{ 2, 0xe2, 0x0f },			/* te_rising_edge */
> +	{ 2, 0xb0, 0x00 },			/* param_pos_default */
> +	{ 1, MIPI_DCS_EXIT_SLEEP_MODE },

mipi_dsi_dcs_exit_sleep_mode, I am not a big fan of these helpers, but
at least the code will be consistent with current drm_panel drivers.

> +};
> +
> +static const  unsigned char prepare_cmds2[][4] = {
> +	{ 3, 0xb1, 0x00, 0x09 },	/* elvss_cond */
> +	{ 2, 0x36, 0x40 },		/* set_pos */

It is standard DCS command:

    MIPI_DCS_SET_ADDRESS_MODE    = 0x36,
> +	{ 2, 0x51, 0xff },		/* white_brightness_default */
> +	{ 2, 0x53, 0x20 },		/* white_ctrl */
> +	{ 2, 0x55, 0x00 },		/* acl_off */
    MIPI_DCS_SET_DISPLAY_BRIGHTNESS = 0x51,        /* MIPI DCS 1.3 */
    MIPI_DCS_WRITE_CONTROL_DISPLAY  = 0x53,        /* MIPI DCS 1.3 */
    MIPI_DCS_WRITE_POWER_SAVE    = 0x55,        /* MIPI DCS 1.3 */

> +	{ 1, MIPI_DCS_SET_TEAR_ON },

mipi_dsi_dcs_set_tear_on

> +};
> +


I think it would be probably better to remove prepare_cmds[12] arrays
and code commands directly,
maybe with some helper allowing variable number of parameters for DCS
command, it has chances to be accepted[1].

[1]: http://marc.info/?l=dri-devel&m=148637093704184&w=2

> +
> +static inline struct s6e63j0x03 *panel_to_s6e63j0x03(struct drm_panel *panel)
> +{
> +	return container_of(panel, struct s6e63j0x03, panel);
> +}
> +
> +static inline ssize_t s6e63j0x03_dcs_write_seq(struct s6e63j0x03 *ctx,
> +					const void *seq, size_t len)
> +{
> +	struct mipi_dsi_device *dsi = to_mipi_dsi_device(ctx->dev);
> +
> +	return mipi_dsi_dcs_write_buffer(dsi, seq, len);
> +}
> +
> +static inline int s6e63j0x03_enable_lv2_command(struct s6e63j0x03 *ctx)
> +{
> +	unsigned char seq[] = { MCS_LEVEL2_KEY, 0x5a, 0x5a };
> +
> +	return s6e63j0x03_dcs_write_seq(ctx, seq, ARRAY_SIZE(seq));
> +}
> +
> +static inline int s6e63j0x03_apply_mtp_key(struct s6e63j0x03 *ctx, bool on)
> +{
> +	unsigned char seq1[3] = { MCS_MTP_KEY, 0x5a, 0x5a };
> +	unsigned char seq2[3] = { MCS_MTP_KEY, 0xa5, 0xa5 };
> +
> +	return s6e63j0x03_dcs_write_seq(ctx, on ? seq1 : seq2,
> +					ARRAY_SIZE(seq1));
> +}
> +
> +static int s6e63j0x03_power_on(struct s6e63j0x03 *ctx)
> +{
> +	int ret;
> +
> +	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
> +	if (ret < 0)
> +		return ret;
> +
> +	msleep(30);
> +
> +	gpiod_set_value(ctx->reset_gpio, 0);
> +	usleep_range(1000, 2000);
> +	gpiod_set_value(ctx->reset_gpio, 1);
> +	usleep_range(5000, 6000);
> +
> +	return 0;
> +}
> +
> +static int s6e63j0x03_power_off(struct s6e63j0x03 *ctx)
> +{
> +	int ret;
> +
> +	gpiod_set_value(ctx->reset_gpio, 0);
> +
> +	ret = regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
> +	if (ret < 0)
> +		return ret;
> +
> +	return 0;
> +}
> +
> +static int s6e63j0x03_get_brightness(struct backlight_device *bl_dev)
> +{
> +	return bl_dev->props.brightness;
> +}

This callback can be omitted.

> +
> +static unsigned int s6e63j0x03_get_brightness_index(unsigned int brightness)
> +{
> +	unsigned int index;
> +
> +	index = brightness / (MAX_BRIGHTNESS / NUM_GAMMA_STEPS);
> +
> +	if (index >= NUM_GAMMA_STEPS)
> +		index = NUM_GAMMA_STEPS - 1;
> +
> +	return index;
> +}
> +
> +static int s6e63j0x03_update_gamma(struct s6e63j0x03 *ctx,
> +					unsigned int brightness)
> +{
> +	struct backlight_device *bl_dev = ctx->bl_dev;
> +	unsigned int index = s6e63j0x03_get_brightness_index(brightness);
> +	int ret;
> +
> +	ret = s6e63j0x03_apply_mtp_key(ctx, true);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = s6e63j0x03_dcs_write_seq(ctx, gamma_tbl[index], GAMMA_CMD_CNT);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = s6e63j0x03_apply_mtp_key(ctx, false);
> +	if (ret < 0)
> +		return ret;
> +
> +	bl_dev->props.brightness = brightness;
> +
> +	return 0;
> +}
> +
> +static int s6e63j0x03_set_brightness(struct backlight_device *bl_dev)
> +{
> +	struct s6e63j0x03 *ctx = (struct s6e63j0x03 *)bl_get_data(bl_dev);
> +	unsigned int brightness = bl_dev->props.brightness;
> +	int ret;
> +
> +	if (brightness < MIN_BRIGHTNESS ||
> +		brightness > bl_dev->props.max_brightness) {
> +		dev_err(ctx->dev, "Invalid brightness: %u\n", brightness);
> +		return -EINVAL;
> +	}

Range check is performed already by the framework, so it can be removed.

> +
> +	if (bl_dev->props.power > FB_BLANK_NORMAL)
> +		return -EPERM;

I guess this is unnecessary as almost nobody checks error code returned
by backlight_update_status.
I suspect the function is missing props.power handling but the whole
backlight framework is not clear for me :)

> +
> +	ret = s6e63j0x03_update_gamma(ctx, brightness);
> +	if (ret < 0)
> +		return ret;
> +
> +	return 0;
> +}
> +
> +static const struct backlight_ops s6e63j0x03_bl_ops = {
> +	.get_brightness = s6e63j0x03_get_brightness,
> +	.update_status = s6e63j0x03_set_brightness,
> +};
> +
> +static int s6e63j0x03_disable(struct drm_panel *panel)
> +{
> +	struct s6e63j0x03 *ctx = panel_to_s6e63j0x03(panel);
> +	struct backlight_device *bl_dev = ctx->bl_dev;
> +	u8 seq[] = { MIPI_DCS_SET_DISPLAY_OFF };
> +	int ret;
> +
> +	ret = s6e63j0x03_dcs_write_seq(ctx, seq, ARRAY_SIZE(seq));

 Use mipi_dsi_dcs_set_display_off instead.

> +	if (ret > 0)
> +		bl_dev->props.power = FB_BLANK_NORMAL;
> +
> +	return 0;
> +}
> +
> +static int s6e63j0x03_unprepare(struct drm_panel *panel)
> +{
> +	struct s6e63j0x03 *ctx = panel_to_s6e63j0x03(panel);
> +	struct backlight_device *bl_dev = ctx->bl_dev;
> +	u8 seq[] = { MIPI_DCS_ENTER_SLEEP_MODE };
> +	int ret;
> +
> +	ret = s6e63j0x03_dcs_write_seq(ctx, seq, ARRAY_SIZE(seq));

mipi_dsi_dcs_enter_sleep_mode

> +	if (ret < 0)
> +		return ret;
> +
> +	msleep(120);
> +
> +	ret = s6e63j0x03_power_off(ctx);
> +	if (ret < 0)
> +		return ret;
> +
> +	bl_dev->props.power = FB_BLANK_POWERDOWN;
> +
> +	return 0;
> +}
> +
> +static int s6e63j0x03_prepare(struct drm_panel *panel)
> +{
> +	struct s6e63j0x03 *ctx = panel_to_s6e63j0x03(panel);
> +	struct backlight_device *bl_dev = ctx->bl_dev;
> +	int ret;
> +	int i;
> +
> +	ret = s6e63j0x03_power_on(ctx);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = s6e63j0x03_enable_lv2_command(ctx);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = s6e63j0x03_apply_mtp_key(ctx, true);
> +	if (ret < 0)
> +		return ret;
> +
> +	for (i = 0; i < ARRAY_SIZE(prepare_cmds1); i++) {
> +		ret = s6e63j0x03_dcs_write_seq(ctx, &prepare_cmds1[i][1],
> +						prepare_cmds1[i][0]);
> +		if (ret < 0)
> +			return ret;
> +	}
> +
> +	msleep(120);
> +
> +	for (i = 0; i < ARRAY_SIZE(prepare_cmds2); i++) {
> +		ret = s6e63j0x03_dcs_write_seq(ctx, &prepare_cmds2[i][1],
> +						prepare_cmds2[i][0]);
> +		if (ret < 0)
> +			return ret;
> +	}
> +
> +	ret = s6e63j0x03_apply_mtp_key(ctx, false);
> +	if (ret < 0)
> +		return ret;
> +
> +	bl_dev->props.power = FB_BLANK_NORMAL;
> +
> +	return 0;
> +}
> +
> +static int s6e63j0x03_enable(struct drm_panel *panel)
> +{
> +	struct s6e63j0x03 *ctx = panel_to_s6e63j0x03(panel);
> +	struct backlight_device *bl_dev = ctx->bl_dev;
> +	u8 seq[] = { MIPI_DCS_SET_DISPLAY_ON };
> +	int ret;
> +
> +	ret = s6e63j0x03_dcs_write_seq(ctx, seq, ARRAY_SIZE(seq));
> +	if (ret > 0)
> +		bl_dev->props.power = FB_BLANK_UNBLANK;
> +
> +	return 0;
> +}

For many (maybe most) panels power on sequence is as follows:
0. Enable power supplies and gpios.
1. Initialization, including MIPI_DCS_EXIT_SLEEP_MODE
2. Wait for 120ms, to avoid display glitches.
3. Unblanking and adjusting display, including MIPI_DCS_SET_DISPLAY_ON.

And power-off:
4. MIPI_DCS_SET_DISPLAY_OFF
5. MIPI_DCS_ENTER_SLEEP_MODE
6. Wait for 120ms
7. Disable power supplies and gpios.

I suppose waiting for 120ms is a good indicator what should be put into
prepare/enable/disable/unprepare phase.
In my opinion it should be as follows:
Prepare: 0, 1
Enable: 2, 3
Disable: 4,5,6
Unprepare: 7

What do you think about it?
Could you arrange the code this way and test if it works correctly?
Maybe you/other developers have some opinions about it?

> +
> +static const struct drm_display_mode default_mode = {
> +	.clock = 4644,
> +	.hdisplay = 320,
> +	.hsync_start = 320 + 1,
> +	.hsync_end = 320 + 1 + 1,
> +	.htotal = 320 + 1 + 1 + 1,
> +	.vdisplay = 320,
> +	.vsync_start = 320 + 150,
> +	.vsync_end = 320 + 150 + 1,
> +	.vtotal = 320 + 150 + 1 + 2,
> +	.vrefresh = 30,
> +	.flags = 0,
> +};

clock should be equal vtotal*htotal*vrefresh, it is little higher? what
is the reason?
What is actual refresh rate?


> +
> +static int s6e63j0x03_get_modes(struct drm_panel *panel)
> +{
> +	struct drm_connector *connector = panel->connector;
> +	struct drm_display_mode *mode;
> +
> +	mode = drm_mode_duplicate(panel->drm, &default_mode);
> +	if (!mode) {
> +		DRM_ERROR("failed to add mode %ux%ux@%u\n",
> +				default_mode.hdisplay, default_mode.vdisplay,
> +				default_mode.vrefresh);
> +		return -ENOMEM;
> +	}
> +
> +	drm_mode_set_name(mode);
> +
> +	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
> +	drm_mode_probed_add(connector, mode);
> +
> +	connector->display_info.width_mm = 29;
> +	connector->display_info.height_mm = 29;
> +
> +	return 1;
> +}
> +
> +static const struct drm_panel_funcs s6e63j0x03_funcs = {
> +	.disable = s6e63j0x03_disable,
> +	.unprepare = s6e63j0x03_unprepare,
> +	.prepare = s6e63j0x03_prepare,
> +	.enable = s6e63j0x03_enable,
> +	.get_modes = s6e63j0x03_get_modes,
> +};
> +
> +static int s6e63j0x03_probe(struct mipi_dsi_device *dsi)
> +{
> +	struct device *dev = &dsi->dev;
> +	struct s6e63j0x03 *ctx;
> +	int ret;
> +
> +	ctx = devm_kzalloc(dev, sizeof(struct s6e63j0x03), GFP_KERNEL);
> +	if (!ctx)
> +		return -ENOMEM;
> +
> +	mipi_dsi_set_drvdata(dsi, ctx);
> +
> +	ctx->dev = dev;
> +
> +	dsi->lanes = 1;
> +	dsi->format = MIPI_DSI_FMT_RGB888;
> +	dsi->mode_flags = MIPI_DSI_MODE_EOT_PACKET | MIPI_DSI_MODE_VIDEO_BURST;

MIPI_DSI_MODE_VIDEO_BURST flag is only valid with MIPI_DSI_MODE_VIDEO,
ie in video mode.

--
Regards
Andrzej

> +
> +	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_HIGH);
> +	if (IS_ERR(ctx->reset_gpio)) {
> +		dev_err(dev, "cannot get reset-gpio: %ld\n",
> +				PTR_ERR(ctx->reset_gpio));
> +		return PTR_ERR(ctx->reset_gpio);
> +	}
> +
> +	drm_panel_init(&ctx->panel);
> +	ctx->panel.dev = dev;
> +	ctx->panel.funcs = &s6e63j0x03_funcs;
> +
> +	ctx->bl_dev = backlight_device_register("s6e63j0x03", dev, ctx,
> +						&s6e63j0x03_bl_ops, NULL);
> +	if (IS_ERR(ctx->bl_dev)) {
> +		dev_err(dev, "failed to register backlight device\n");
> +		return PTR_ERR(ctx->bl_dev);
> +	}
> +
> +	ctx->bl_dev->props.max_brightness = MAX_BRIGHTNESS;
> +	ctx->bl_dev->props.brightness = DEFAULT_BRIGHTNESS;
> +	ctx->bl_dev->props.power = FB_BLANK_POWERDOWN;
> +
> +	ret = drm_panel_add(&ctx->panel);
> +	if (ret < 0)
> +		goto unregister_backlight;
> +
> +	ret = mipi_dsi_attach(dsi);
> +	if (ret < 0)
> +		goto remove_panel;
> +
> +	return ret;
> +
> +remove_panel:
> +	drm_panel_remove(&ctx->panel);
> +
> +unregister_backlight:
> +	backlight_device_unregister(ctx->bl_dev);
> +
> +	return ret;
> +}
> +
> +static int s6e63j0x03_remove(struct mipi_dsi_device *dsi)
> +{
> +	struct s6e63j0x03 *ctx = mipi_dsi_get_drvdata(dsi);
> +
> +	mipi_dsi_detach(dsi);
> +	drm_panel_remove(&ctx->panel);
> +
> +	backlight_device_unregister(ctx->bl_dev);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id s6e63j0x03_of_match[] = {
> +	{ .compatible = "samsung,s6e63j0x03" },
> +	{ }
> +};
> +MODULE_DEVICE_TABLE(of, s6e63j0x03_of_match);
> +
> +static struct mipi_dsi_driver s6e63j0x03_driver = {
> +	.probe = s6e63j0x03_probe,
> +	.remove = s6e63j0x03_remove,
> +	.driver = {
> +		.name = "panel_samsung_s6e63j0x03",
> +		.of_match_table = s6e63j0x03_of_match,
> +	},
> +};
> +module_mipi_dsi_driver(s6e63j0x03_driver);
> +
> +MODULE_AUTHOR("Inki Dae <inki.dae@samsung.com>");
> +MODULE_AUTHOR("Hoegeun Kwon <hoegeun.kwon@samsung.com>");
> +MODULE_DESCRIPTION("MIPI-DSI based s6e63j0x03 AMOLED LCD Panel Driver");
> +MODULE_LICENSE("GPL v2");

Re: [PATCH 2/3] drm/panel: Add support for s6e63j0x03 panel driver

[Hoegeun Kwon]

Hi Andrzej,

Thanks for your review.

On 06/12/2017 10:16 PM, Andrzej Hajda wrote:
> Hi Hoegeun,
>
> Nice to see patches completing support for mainlined platforms.
>
> On 09.06.2017 06:59, Hoegeun Kwon wrote:
>> This patch adds MIPI-DSI based S6E63J0X03 AMOLED LCD panel driver
>> which uses mipi_dsi bus to communicate with panel. The panel has
>> 320×320 resolution in 1.63" physical panel. This panel is used in
>> Samsung Galaxy Gear 2.
>>
>> Signed-off-by: Inki Dae <inki.dae@samsung.com>
>> Signed-off-by: Hyungwon Hwang <human.hwang@samsung.com>
>> Signed-off-by: Hoegeun Kwon <hoegeun.kwon@samsung.com>
>> ---
>>   drivers/gpu/drm/panel/Kconfig                    |   7 +
>>   drivers/gpu/drm/panel/Makefile                   |   1 +
>>   drivers/gpu/drm/panel/panel-samsung-s6e63j0x03.c | 491 +++++++++++++++++++++++
>>   3 files changed, 499 insertions(+)
>>   create mode 100644 drivers/gpu/drm/panel/panel-samsung-s6e63j0x03.c
>>
>>

...

>> +
>> +static int s6e63j0x03_enable(struct drm_panel *panel)
>> +{
>> +	struct s6e63j0x03 *ctx = panel_to_s6e63j0x03(panel);
>> +	struct backlight_device *bl_dev = ctx->bl_dev;
>> +	u8 seq[] = { MIPI_DCS_SET_DISPLAY_ON };
>> +	int ret;
>> +
>> +	ret = s6e63j0x03_dcs_write_seq(ctx, seq, ARRAY_SIZE(seq));
>> +	if (ret > 0)
>> +		bl_dev->props.power = FB_BLANK_UNBLANK;
>> +
>> +	return 0;
>> +}
> For many (maybe most) panels power on sequence is as follows:
> 0. Enable power supplies and gpios.
> 1. Initialization, including MIPI_DCS_EXIT_SLEEP_MODE
> 2. Wait for 120ms, to avoid display glitches.
> 3. Unblanking and adjusting display, including MIPI_DCS_SET_DISPLAY_ON.
>
> And power-off:
> 4. MIPI_DCS_SET_DISPLAY_OFF
> 5. MIPI_DCS_ENTER_SLEEP_MODE
> 6. Wait for 120ms
> 7. Disable power supplies and gpios.
>
> I suppose waiting for 120ms is a good indicator what should be put into
> prepare/enable/disable/unprepare phase.
> In my opinion it should be as follows:
> Prepare: 0, 1
> Enable: 2, 3
> Disable: 4,5,6
> Unprepare: 7
>
> What do you think about it?
> Could you arrange the code this way and test if it works correctly?
> Maybe you/other developers have some opinions about it?

I agree with you.
I will send ver2 patch with the above style.
And modify it to use as mipi_dsi_dcs_*.

>> +
>> +static const struct drm_display_mode default_mode = {
>> +	.clock = 4644,
>> +	.hdisplay = 320,
>> +	.hsync_start = 320 + 1,
>> +	.hsync_end = 320 + 1 + 1,
>> +	.htotal = 320 + 1 + 1 + 1,
>> +	.vdisplay = 320,
>> +	.vsync_start = 320 + 150,
>> +	.vsync_end = 320 + 150 + 1,
>> +	.vtotal = 320 + 150 + 1 + 2,
>> +	.vrefresh = 30,
>> +	.flags = 0,
>> +};
> clock should be equal vtotal*htotal*vrefresh, it is little higher? what
> is the reason?
> What is actual refresh rate?

The actual refresh rate is 30.43Hz
So I will modfiy the clock Hz to 4649.

((323 * 473 )* 30.43) / 1000 = 4649

Best regards,
Hoegeun

[PATCH 3/3] ARM: dts: exynos: Remove the display-timing and delay from rinato dts

[Hoegeun Kwon]

The display-timing and delay are included in the panel driver. So it
should be removed in dts.

Signed-off-by: Hoegeun Kwon <hoegeun.kwon@samsung.com>
---
 arch/arm/boot/dts/exynos3250-rinato.dts | 22 ----------------------
 1 file changed, 22 deletions(-)

diff --git a/arch/arm/boot/dts/exynos3250-rinato.dts b/arch/arm/boot/dts/exynos3250-rinato.dts
index 82e676a..3d19b7c 100644
--- a/arch/arm/boot/dts/exynos3250-rinato.dts
+++ b/arch/arm/boot/dts/exynos3250-rinato.dts
@@ -227,28 +227,6 @@
 		vci-supply = <&ldo20_reg>;
 		reset-gpios = <&gpe0 1 GPIO_ACTIVE_HIGH>;
 		te-gpios = <&gpx0 6 GPIO_ACTIVE_HIGH>;
-		power-on-delay= <30>;
-		power-off-delay= <120>;
-		reset-delay = <5>;
-		init-delay = <100>;
-		flip-horizontal;
-		flip-vertical;
-		panel-width-mm = <29>;
-		panel-height-mm = <29>;
-
-		display-timings {
-			timing-0 {
-				clock-frequency = <4600000>;
-				hactive = <320>;
-				vactive = <320>;
-				hfront-porch = <1>;
-				hback-porch = <1>;
-				hsync-len = <1>;
-				vfront-porch = <150>;
-				vback-porch = <1>;
-				vsync-len = <2>;
-			};
-		};
 	};
 };
 
-- 
1.9.1

Re: [PATCH 3/3] ARM: dts: exynos: Remove the display-timing and delay from rinato dts

[Krzysztof Kozlowski]

On Fri, Jun 09, 2017 at 01:59:14PM +0900, Hoegeun Kwon wrote:
> The display-timing and delay are included in the panel driver. So it
> should be removed in dts.
> 
> Signed-off-by: Hoegeun Kwon <hoegeun.kwon@samsung.com>
> ---
>  arch/arm/boot/dts/exynos3250-rinato.dts | 22 ----------------------
>  1 file changed, 22 deletions(-)

I understand this depends on merging in the panel driver so this will
have to wait till then. I'll take it when panel hits mainline (arm-soc
folks discourage recently cross-tree merges for DT).

Best regards,
Krzysztof

Re: [PATCH 3/3] ARM: dts: exynos: Remove the display-timing and delay from rinato dts

[Hoegeun Kwon]

On 06/09/2017 04:45 PM, Krzysztof Kozlowski wrote:
> On Fri, Jun 09, 2017 at 01:59:14PM +0900, Hoegeun Kwon wrote:
>> The display-timing and delay are included in the panel driver. So it
>> should be removed in dts.
>>
>> Signed-off-by: Hoegeun Kwon <hoegeun.kwon@samsung.com>
>> ---
>>   arch/arm/boot/dts/exynos3250-rinato.dts | 22 ----------------------
>>   1 file changed, 22 deletions(-)
> I understand this depends on merging in the panel driver so this will
> have to wait till then. I'll take it when panel hits mainline (arm-soc
> folks discourage recently cross-tree merges for DT).
>
> Best regards,
> Krzysztof

Thanks for your reply.
I agree with your opinion,
I will wait for the panel driver to merge.

Best regards,
Hoegeun