[PATCH v3 1/2] dt-bindings: display/panel: add bindings for S6E88A0-AMS452EF01

[PATCH v3 1/2] dt-bindings: display/panel: add bindings for S6E88A0-AMS452EF01

[michael.srba]

From: Michael Srba <Michael.Srba@seznam.cz>

This patch adds dts bindings for Samsung AMS452EF01 AMOLED panel, which makes
use of their S6E88A0 controller.

Signed-off-by: Michael Srba <Michael.Srba@seznam.cz>
---
Hi,
I recall now that tabs cause a syntax error in yaml, should be easy to check 
in checkpatch.pl?
I hope there are no more embarassing oversights left.

Changes in v2: use yaml format for the binding
Changes in v3: fix oversights too embarassing to admit here
---
 .../panel/samsung,s6e88a0-ams452ef01.yaml     | 46 +++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/panel/samsung,s6e88a0-ams452ef01.yaml

diff --git a/Documentation/devicetree/bindings/display/panel/samsung,s6e88a0-ams452ef01.yaml b/Documentation/devicetree/bindings/display/panel/samsung,s6e88a0-ams452ef01.yaml
new file mode 100644
index 000000000000..298fc9a78297
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/panel/samsung,s6e88a0-ams452ef01.yaml
@@ -0,0 +1,46 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/display/panel/samsung,s6e88a0-ams452ef01#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Samsung AMS452EF01 AMOLED panel with S6E88A0 video mode DSI controller
+
+maintainers:
+  - Michael Srba <Michael.Srba@seznam.cz>
+
+allOf:
+  - $ref: panel-common.yaml#
+
+properties:
+  compatible:
+    const: samsung,s6e88a0-ams452ef01
+  reg: true
+  reset-gpios: true
+  vdd3-supply:
+     description: core voltage supply
+  vci-supply:
+     description: voltage supply for analog circuits
+
+required:
+  - compatible
+  - reg
+  - vdd3-supply
+  - vci-supply
+  - reset-gpios
+
+additionalProperties: false
+
+examples:
+  - |
+    #include <dt-bindings/gpio/gpio.h>
+
+    panel@0 {
+            reg = <0>;
+
+            compatible = "samsung,s6e88a0-ams452ef01";
+
+            vdd3-supply = <&pm8916_l17>;
+            vci-supply = <&reg_vlcd_vci>;
+            reset-gpios = <&msmgpio 25 GPIO_ACTIVE_HIGH>;
+    };
-- 
2.24.0

[PATCH v3 2/2] drm/panel: Add a driver for Samsung s6e88a0-ams452ef01 panel

[michael.srba]

From: Michael Srba <Michael.Srba@seznam.cz>

Signed-off-by: Michael Srba <Michael.Srba@seznam.cz>
---
Changes in v2: reorder includes; remove empty functions; fix after rebasing
Changes in v3: fix straightforward line-over-80-chars issues
---
 drivers/gpu/drm/panel/Kconfig                 |   6 +
 drivers/gpu/drm/panel/Makefile                |   1 +
 .../panel/panel-samsung-s6e88a0-ams452ef01.c  | 291 ++++++++++++++++++
 3 files changed, 298 insertions(+)
 create mode 100644 drivers/gpu/drm/panel/panel-samsung-s6e88a0-ams452ef01.c

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index ae44ac2ec106..0c7d61f32b0e 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -275,6 +275,12 @@ config DRM_PANEL_SAMSUNG_S6E63M0
 	  Say Y here if you want to enable support for Samsung S6E63M0
 	  AMOLED LCD panel.
 
+config DRM_PANEL_SAMSUNG_S6E88A0_AMS452EF01
+	tristate "Samsung AMS452EF01 panel with S6E88A0 DSI video mode controller"
+	depends on OF
+	select DRM_MIPI_DSI
+	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 7c4d3c581fd4..5b622fbe4014 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6D16D0) += panel-samsung-s6d16d0.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E3HA2) += panel-samsung-s6e3ha2.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E63J0X03) += panel-samsung-s6e63j0x03.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E63M0) += panel-samsung-s6e63m0.o
+obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E88A0_AMS452EF01) += panel-samsung-s6e88a0-ams452ef01.o
 obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E8AA0) += panel-samsung-s6e8aa0.o
 obj-$(CONFIG_DRM_PANEL_SEIKO_43WVF1G) += panel-seiko-43wvf1g.o
 obj-$(CONFIG_DRM_PANEL_SHARP_LQ101R1SX01) += panel-sharp-lq101r1sx01.o
diff --git a/drivers/gpu/drm/panel/panel-samsung-s6e88a0-ams452ef01.c b/drivers/gpu/drm/panel/panel-samsung-s6e88a0-ams452ef01.c
new file mode 100644
index 000000000000..14d983f70226
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-samsung-s6e88a0-ams452ef01.c
@@ -0,0 +1,291 @@
+// SPDX-License-Identifier: GPL-2.0-only
+// Copyright (C) 2019, Michael Srba
+
+#include <linux/delay.h>
+#include <linux/gpio/consumer.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/regulator/consumer.h>
+
+#include <video/mipi_display.h>
+
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_modes.h>
+#include <drm/drm_panel.h>
+
+struct s6e88a0_ams452ef01 {
+	struct drm_panel panel;
+	struct mipi_dsi_device *dsi;
+	struct regulator_bulk_data supplies[2];
+	struct gpio_desc *reset_gpio;
+
+	bool prepared;
+};
+
+static inline struct s6e88a0_ams452ef01 *to_s6e88a0_ams452ef01(struct drm_panel *panel)
+{
+	return container_of(panel, struct s6e88a0_ams452ef01, panel);
+}
+
+#define dsi_dcs_write_seq(dsi, seq...) do {				\
+		static const u8 d[] = { seq };				\
+		int ret;						\
+		ret = mipi_dsi_dcs_write_buffer(dsi, d, ARRAY_SIZE(d));	\
+		if (ret < 0)						\
+			return ret;					\
+	} while (0)
+
+static void s6e88a0_ams452ef01_reset(struct s6e88a0_ams452ef01 *ctx)
+{
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+	usleep_range(5000, 6000);
+	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+	usleep_range(1000, 2000);
+	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
+	usleep_range(10000, 11000);
+}
+
+static int s6e88a0_ams452ef01_on(struct s6e88a0_ams452ef01 *ctx)
+{
+	struct mipi_dsi_device *dsi = ctx->dsi;
+	struct device *dev = &dsi->dev;
+	int ret;
+
+	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
+
+	dsi_dcs_write_seq(dsi, 0xf0, 0x5a, 0x5a); // enable LEVEL2 commands
+	dsi_dcs_write_seq(dsi, 0xcc, 0x4c); // set Pixel Clock Divider polarity
+
+	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
+	if (ret < 0) {
+		dev_err(dev, "Failed to exit sleep mode: %d\n", ret);
+		return ret;
+	}
+	msleep(120);
+
+	// set default brightness/gama
+	dsi_dcs_write_seq(dsi, 0xca,
+			  0x01, 0x00, 0x01, 0x00, 0x01, 0x00,	// V255 RR,GG,BB
+			  0x80, 0x80, 0x80,			// V203 R,G,B
+			  0x80, 0x80, 0x80,			// V151 R,G,B
+			  0x80, 0x80, 0x80,			// V87  R,G,B
+			  0x80, 0x80, 0x80,			// V51  R,G,B
+			  0x80, 0x80, 0x80,			// V35  R,G,B
+			  0x80, 0x80, 0x80,			// V23  R,G,B
+			  0x80, 0x80, 0x80,			// V11  R,G,B
+			  0x6b, 0x68, 0x71,			// V3   R,G,B
+			  0x00, 0x00, 0x00);			// V1   R,G,B
+	dsi_dcs_write_seq(dsi, 0xb2, 0x40, 0x0a, 0x17, 0x00, 0x0a); // set default Amoled Off Ratio
+	dsi_dcs_write_seq(dsi, 0xb6, 0x2c, 0x0b); // set default elvss voltage
+	dsi_dcs_write_seq(dsi, MIPI_DCS_WRITE_POWER_SAVE, 0x00);
+	dsi_dcs_write_seq(dsi, 0xf7, 0x03); // gamma/aor update
+	dsi_dcs_write_seq(dsi, 0xf0, 0xa5, 0xa5); // disable LEVEL2 commands
+
+	ret = mipi_dsi_dcs_set_display_on(dsi);
+	if (ret < 0) {
+		dev_err(dev, "Failed to set display on: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int s6e88a0_ams452ef01_off(struct s6e88a0_ams452ef01 *ctx)
+{
+	struct mipi_dsi_device *dsi = ctx->dsi;
+	struct device *dev = &dsi->dev;
+	int ret;
+
+	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
+
+	ret = mipi_dsi_dcs_set_display_off(dsi);
+	if (ret < 0) {
+		dev_err(dev, "Failed to set display off: %d\n", ret);
+		return ret;
+	}
+	msleep(35);
+
+	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
+	if (ret < 0) {
+		dev_err(dev, "Failed to enter sleep mode: %d\n", ret);
+		return ret;
+	}
+	msleep(120);
+
+	return 0;
+}
+
+static int s6e88a0_ams452ef01_prepare(struct drm_panel *panel)
+{
+	struct s6e88a0_ams452ef01 *ctx = to_s6e88a0_ams452ef01(panel);
+	struct device *dev = &ctx->dsi->dev;
+	int ret;
+
+	if (ctx->prepared)
+		return 0;
+
+	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+	if (ret < 0) {
+		dev_err(dev, "Failed to enable regulators: %d\n", ret);
+		return ret;
+	}
+
+	s6e88a0_ams452ef01_reset(ctx);
+
+	ret = s6e88a0_ams452ef01_on(ctx);
+	if (ret < 0) {
+		dev_err(dev, "Failed to initialize panel: %d\n", ret);
+		gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+		regulator_bulk_disable(ARRAY_SIZE(ctx->supplies),
+				       ctx->supplies);
+		return ret;
+	}
+
+	ctx->prepared = true;
+	return 0;
+}
+
+static int s6e88a0_ams452ef01_unprepare(struct drm_panel *panel)
+{
+	struct s6e88a0_ams452ef01 *ctx = to_s6e88a0_ams452ef01(panel);
+	struct device *dev = &ctx->dsi->dev;
+	int ret;
+
+	if (!ctx->prepared)
+		return 0;
+
+	ret = s6e88a0_ams452ef01_off(ctx);
+	if (ret < 0)
+		dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
+
+	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
+	regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
+
+	ctx->prepared = false;
+	return 0;
+}
+
+static const struct drm_display_mode s6e88a0_ams452ef01_mode = {
+	.clock = (540 + 88 + 4 + 20) * (960 + 14 + 2 + 8) * 60 / 1000,
+	.hdisplay = 540,
+	.hsync_start = 540 + 88,
+	.hsync_end = 540 + 88 + 4,
+	.htotal = 540 + 88 + 4 + 20,
+	.vdisplay = 960,
+	.vsync_start = 960 + 14,
+	.vsync_end = 960 + 14 + 2,
+	.vtotal = 960 + 14 + 2 + 8,
+	.vrefresh = 60,
+	.width_mm = 56,
+	.height_mm = 100,
+};
+
+static int s6e88a0_ams452ef01_get_modes(struct drm_panel *panel,
+					struct drm_connector *connector)
+{
+	struct drm_display_mode *mode;
+
+	mode = drm_mode_duplicate(connector->dev, &s6e88a0_ams452ef01_mode);
+	if (!mode)
+		return -ENOMEM;
+
+	drm_mode_set_name(mode);
+
+	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
+	connector->display_info.width_mm = mode->width_mm;
+	connector->display_info.height_mm = mode->height_mm;
+	drm_mode_probed_add(connector, mode);
+
+	return 1;
+}
+
+static const struct drm_panel_funcs s6e88a0_ams452ef01_panel_funcs = {
+	.unprepare = s6e88a0_ams452ef01_unprepare,
+	.prepare = s6e88a0_ams452ef01_prepare,
+	.get_modes = s6e88a0_ams452ef01_get_modes,
+};
+
+static int s6e88a0_ams452ef01_probe(struct mipi_dsi_device *dsi)
+{
+	struct device *dev = &dsi->dev;
+	struct s6e88a0_ams452ef01 *ctx;
+	int ret;
+
+	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	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)) {
+		ret = PTR_ERR(ctx->reset_gpio);
+		dev_err(dev, "Failed to get reset-gpios: %d\n", ret);
+		return ret;
+	}
+
+	ctx->dsi = dsi;
+	mipi_dsi_set_drvdata(dsi, ctx);
+
+	dsi->lanes = 2;
+	dsi->format = MIPI_DSI_FMT_RGB888;
+	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST;
+
+	drm_panel_init(&ctx->panel, dev, &s6e88a0_ams452ef01_panel_funcs,
+		       DRM_MODE_CONNECTOR_DSI);
+
+	ret = drm_panel_add(&ctx->panel);
+	if (ret < 0) {
+		dev_err(dev, "Failed to add panel: %d\n", ret);
+		return ret;
+	}
+
+	ret = mipi_dsi_attach(dsi);
+	if (ret < 0) {
+		dev_err(dev, "Failed to attach to DSI host: %d\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+static int s6e88a0_ams452ef01_remove(struct mipi_dsi_device *dsi)
+{
+	struct s6e88a0_ams452ef01 *ctx = mipi_dsi_get_drvdata(dsi);
+	int ret;
+
+	ret = mipi_dsi_detach(dsi);
+	if (ret < 0)
+		dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);
+
+	drm_panel_remove(&ctx->panel);
+
+	return 0;
+}
+
+static const struct of_device_id s6e88a0_ams452ef01_of_match[] = {
+	{ .compatible = "samsung,s6e88a0-ams452ef01" },
+	{ /* sentinel */ },
+};
+MODULE_DEVICE_TABLE(of, s6e88a0_ams452ef01_of_match);
+
+static struct mipi_dsi_driver s6e88a0_ams452ef01_driver = {
+	.probe = s6e88a0_ams452ef01_probe,
+	.remove = s6e88a0_ams452ef01_remove,
+	.driver = {
+		.name = "panel-s6e88a0-ams452ef01",
+		.of_match_table = s6e88a0_ams452ef01_of_match,
+	},
+};
+module_mipi_dsi_driver(s6e88a0_ams452ef01_driver);
+
+MODULE_AUTHOR("Michael Srba <Michael.Srba@seznam.cz>");
+MODULE_DESCRIPTION("MIPI-DSI based Panel Driver for AMS452EF01 AMOLED LCD with a S6E88A0 controller");
+MODULE_LICENSE("GPL v2");
-- 
2.24.0

Re: [PATCH v3 2/2] drm/panel: Add a driver for Samsung s6e88a0-ams452ef01 panel

[Sam Ravnborg]

Hi Michael.

I fixed a few too long lines warnings.

static inline struct s6e88a0_ams452ef01 *to_s6e88a0_ams452ef01(struct drm_panel *panel)
became:
static inline struct
s6e88a0_ams452ef01 *to_s6e88a0_ams452ef01(struct drm_panel *panel)

And another long line where the comment was moved one line up.

And finally I added a proper changelog.

With this fixed - applied to drm-misc-next.

	Sam


On Thu, Jan 30, 2020 at 09:35:55PM +0100, michael.srba@seznam.cz wrote:
> From: Michael Srba <Michael.Srba@seznam.cz>
> 
> Signed-off-by: Michael Srba <Michael.Srba@seznam.cz>
> ---
> Changes in v2: reorder includes; remove empty functions; fix after rebasing
> Changes in v3: fix straightforward line-over-80-chars issues
> ---
>  drivers/gpu/drm/panel/Kconfig                 |   6 +
>  drivers/gpu/drm/panel/Makefile                |   1 +
>  .../panel/panel-samsung-s6e88a0-ams452ef01.c  | 291 ++++++++++++++++++
>  3 files changed, 298 insertions(+)
>  create mode 100644 drivers/gpu/drm/panel/panel-samsung-s6e88a0-ams452ef01.c
> 
> diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
> index ae44ac2ec106..0c7d61f32b0e 100644
> --- a/drivers/gpu/drm/panel/Kconfig
> +++ b/drivers/gpu/drm/panel/Kconfig
> @@ -275,6 +275,12 @@ config DRM_PANEL_SAMSUNG_S6E63M0
>  	  Say Y here if you want to enable support for Samsung S6E63M0
>  	  AMOLED LCD panel.
>  
> +config DRM_PANEL_SAMSUNG_S6E88A0_AMS452EF01
> +	tristate "Samsung AMS452EF01 panel with S6E88A0 DSI video mode controller"
> +	depends on OF
> +	select DRM_MIPI_DSI
> +	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 7c4d3c581fd4..5b622fbe4014 100644
> --- a/drivers/gpu/drm/panel/Makefile
> +++ b/drivers/gpu/drm/panel/Makefile
> @@ -28,6 +28,7 @@ obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6D16D0) += panel-samsung-s6d16d0.o
>  obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E3HA2) += panel-samsung-s6e3ha2.o
>  obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E63J0X03) += panel-samsung-s6e63j0x03.o
>  obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E63M0) += panel-samsung-s6e63m0.o
> +obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E88A0_AMS452EF01) += panel-samsung-s6e88a0-ams452ef01.o
>  obj-$(CONFIG_DRM_PANEL_SAMSUNG_S6E8AA0) += panel-samsung-s6e8aa0.o
>  obj-$(CONFIG_DRM_PANEL_SEIKO_43WVF1G) += panel-seiko-43wvf1g.o
>  obj-$(CONFIG_DRM_PANEL_SHARP_LQ101R1SX01) += panel-sharp-lq101r1sx01.o
> diff --git a/drivers/gpu/drm/panel/panel-samsung-s6e88a0-ams452ef01.c b/drivers/gpu/drm/panel/panel-samsung-s6e88a0-ams452ef01.c
> new file mode 100644
> index 000000000000..14d983f70226
> --- /dev/null
> +++ b/drivers/gpu/drm/panel/panel-samsung-s6e88a0-ams452ef01.c
> @@ -0,0 +1,291 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +// Copyright (C) 2019, Michael Srba
> +
> +#include <linux/delay.h>
> +#include <linux/gpio/consumer.h>
> +#include <linux/module.h>
> +#include <linux/of.h>
> +#include <linux/regulator/consumer.h>
> +
> +#include <video/mipi_display.h>
> +
> +#include <drm/drm_mipi_dsi.h>
> +#include <drm/drm_modes.h>
> +#include <drm/drm_panel.h>
> +
> +struct s6e88a0_ams452ef01 {
> +	struct drm_panel panel;
> +	struct mipi_dsi_device *dsi;
> +	struct regulator_bulk_data supplies[2];
> +	struct gpio_desc *reset_gpio;
> +
> +	bool prepared;
> +};
> +
> +static inline struct s6e88a0_ams452ef01 *to_s6e88a0_ams452ef01(struct drm_panel *panel)
> +{
> +	return container_of(panel, struct s6e88a0_ams452ef01, panel);
> +}
> +
> +#define dsi_dcs_write_seq(dsi, seq...) do {				\
> +		static const u8 d[] = { seq };				\
> +		int ret;						\
> +		ret = mipi_dsi_dcs_write_buffer(dsi, d, ARRAY_SIZE(d));	\
> +		if (ret < 0)						\
> +			return ret;					\
> +	} while (0)
> +
> +static void s6e88a0_ams452ef01_reset(struct s6e88a0_ams452ef01 *ctx)
> +{
> +	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
> +	usleep_range(5000, 6000);
> +	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
> +	usleep_range(1000, 2000);
> +	gpiod_set_value_cansleep(ctx->reset_gpio, 1);
> +	usleep_range(10000, 11000);
> +}
> +
> +static int s6e88a0_ams452ef01_on(struct s6e88a0_ams452ef01 *ctx)
> +{
> +	struct mipi_dsi_device *dsi = ctx->dsi;
> +	struct device *dev = &dsi->dev;
> +	int ret;
> +
> +	dsi->mode_flags |= MIPI_DSI_MODE_LPM;
> +
> +	dsi_dcs_write_seq(dsi, 0xf0, 0x5a, 0x5a); // enable LEVEL2 commands
> +	dsi_dcs_write_seq(dsi, 0xcc, 0x4c); // set Pixel Clock Divider polarity
> +
> +	ret = mipi_dsi_dcs_exit_sleep_mode(dsi);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to exit sleep mode: %d\n", ret);
> +		return ret;
> +	}
> +	msleep(120);
> +
> +	// set default brightness/gama
> +	dsi_dcs_write_seq(dsi, 0xca,
> +			  0x01, 0x00, 0x01, 0x00, 0x01, 0x00,	// V255 RR,GG,BB
> +			  0x80, 0x80, 0x80,			// V203 R,G,B
> +			  0x80, 0x80, 0x80,			// V151 R,G,B
> +			  0x80, 0x80, 0x80,			// V87  R,G,B
> +			  0x80, 0x80, 0x80,			// V51  R,G,B
> +			  0x80, 0x80, 0x80,			// V35  R,G,B
> +			  0x80, 0x80, 0x80,			// V23  R,G,B
> +			  0x80, 0x80, 0x80,			// V11  R,G,B
> +			  0x6b, 0x68, 0x71,			// V3   R,G,B
> +			  0x00, 0x00, 0x00);			// V1   R,G,B
> +	dsi_dcs_write_seq(dsi, 0xb2, 0x40, 0x0a, 0x17, 0x00, 0x0a); // set default Amoled Off Ratio
> +	dsi_dcs_write_seq(dsi, 0xb6, 0x2c, 0x0b); // set default elvss voltage
> +	dsi_dcs_write_seq(dsi, MIPI_DCS_WRITE_POWER_SAVE, 0x00);
> +	dsi_dcs_write_seq(dsi, 0xf7, 0x03); // gamma/aor update
> +	dsi_dcs_write_seq(dsi, 0xf0, 0xa5, 0xa5); // disable LEVEL2 commands
> +
> +	ret = mipi_dsi_dcs_set_display_on(dsi);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to set display on: %d\n", ret);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int s6e88a0_ams452ef01_off(struct s6e88a0_ams452ef01 *ctx)
> +{
> +	struct mipi_dsi_device *dsi = ctx->dsi;
> +	struct device *dev = &dsi->dev;
> +	int ret;
> +
> +	dsi->mode_flags &= ~MIPI_DSI_MODE_LPM;
> +
> +	ret = mipi_dsi_dcs_set_display_off(dsi);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to set display off: %d\n", ret);
> +		return ret;
> +	}
> +	msleep(35);
> +
> +	ret = mipi_dsi_dcs_enter_sleep_mode(dsi);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to enter sleep mode: %d\n", ret);
> +		return ret;
> +	}
> +	msleep(120);
> +
> +	return 0;
> +}
> +
> +static int s6e88a0_ams452ef01_prepare(struct drm_panel *panel)
> +{
> +	struct s6e88a0_ams452ef01 *ctx = to_s6e88a0_ams452ef01(panel);
> +	struct device *dev = &ctx->dsi->dev;
> +	int ret;
> +
> +	if (ctx->prepared)
> +		return 0;
> +
> +	ret = regulator_bulk_enable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to enable regulators: %d\n", ret);
> +		return ret;
> +	}
> +
> +	s6e88a0_ams452ef01_reset(ctx);
> +
> +	ret = s6e88a0_ams452ef01_on(ctx);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to initialize panel: %d\n", ret);
> +		gpiod_set_value_cansleep(ctx->reset_gpio, 0);
> +		regulator_bulk_disable(ARRAY_SIZE(ctx->supplies),
> +				       ctx->supplies);
> +		return ret;
> +	}
> +
> +	ctx->prepared = true;
> +	return 0;
> +}
> +
> +static int s6e88a0_ams452ef01_unprepare(struct drm_panel *panel)
> +{
> +	struct s6e88a0_ams452ef01 *ctx = to_s6e88a0_ams452ef01(panel);
> +	struct device *dev = &ctx->dsi->dev;
> +	int ret;
> +
> +	if (!ctx->prepared)
> +		return 0;
> +
> +	ret = s6e88a0_ams452ef01_off(ctx);
> +	if (ret < 0)
> +		dev_err(dev, "Failed to un-initialize panel: %d\n", ret);
> +
> +	gpiod_set_value_cansleep(ctx->reset_gpio, 0);
> +	regulator_bulk_disable(ARRAY_SIZE(ctx->supplies), ctx->supplies);
> +
> +	ctx->prepared = false;
> +	return 0;
> +}
> +
> +static const struct drm_display_mode s6e88a0_ams452ef01_mode = {
> +	.clock = (540 + 88 + 4 + 20) * (960 + 14 + 2 + 8) * 60 / 1000,
> +	.hdisplay = 540,
> +	.hsync_start = 540 + 88,
> +	.hsync_end = 540 + 88 + 4,
> +	.htotal = 540 + 88 + 4 + 20,
> +	.vdisplay = 960,
> +	.vsync_start = 960 + 14,
> +	.vsync_end = 960 + 14 + 2,
> +	.vtotal = 960 + 14 + 2 + 8,
> +	.vrefresh = 60,
> +	.width_mm = 56,
> +	.height_mm = 100,
> +};
> +
> +static int s6e88a0_ams452ef01_get_modes(struct drm_panel *panel,
> +					struct drm_connector *connector)
> +{
> +	struct drm_display_mode *mode;
> +
> +	mode = drm_mode_duplicate(connector->dev, &s6e88a0_ams452ef01_mode);
> +	if (!mode)
> +		return -ENOMEM;
> +
> +	drm_mode_set_name(mode);
> +
> +	mode->type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED;
> +	connector->display_info.width_mm = mode->width_mm;
> +	connector->display_info.height_mm = mode->height_mm;
> +	drm_mode_probed_add(connector, mode);
> +
> +	return 1;
> +}
> +
> +static const struct drm_panel_funcs s6e88a0_ams452ef01_panel_funcs = {
> +	.unprepare = s6e88a0_ams452ef01_unprepare,
> +	.prepare = s6e88a0_ams452ef01_prepare,
> +	.get_modes = s6e88a0_ams452ef01_get_modes,
> +};
> +
> +static int s6e88a0_ams452ef01_probe(struct mipi_dsi_device *dsi)
> +{
> +	struct device *dev = &dsi->dev;
> +	struct s6e88a0_ams452ef01 *ctx;
> +	int ret;
> +
> +	ctx = devm_kzalloc(dev, sizeof(*ctx), GFP_KERNEL);
> +	if (!ctx)
> +		return -ENOMEM;
> +
> +	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)) {
> +		ret = PTR_ERR(ctx->reset_gpio);
> +		dev_err(dev, "Failed to get reset-gpios: %d\n", ret);
> +		return ret;
> +	}
> +
> +	ctx->dsi = dsi;
> +	mipi_dsi_set_drvdata(dsi, ctx);
> +
> +	dsi->lanes = 2;
> +	dsi->format = MIPI_DSI_FMT_RGB888;
> +	dsi->mode_flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST;
> +
> +	drm_panel_init(&ctx->panel, dev, &s6e88a0_ams452ef01_panel_funcs,
> +		       DRM_MODE_CONNECTOR_DSI);
> +
> +	ret = drm_panel_add(&ctx->panel);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to add panel: %d\n", ret);
> +		return ret;
> +	}
> +
> +	ret = mipi_dsi_attach(dsi);
> +	if (ret < 0) {
> +		dev_err(dev, "Failed to attach to DSI host: %d\n", ret);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static int s6e88a0_ams452ef01_remove(struct mipi_dsi_device *dsi)
> +{
> +	struct s6e88a0_ams452ef01 *ctx = mipi_dsi_get_drvdata(dsi);
> +	int ret;
> +
> +	ret = mipi_dsi_detach(dsi);
> +	if (ret < 0)
> +		dev_err(&dsi->dev, "Failed to detach from DSI host: %d\n", ret);
> +
> +	drm_panel_remove(&ctx->panel);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id s6e88a0_ams452ef01_of_match[] = {
> +	{ .compatible = "samsung,s6e88a0-ams452ef01" },
> +	{ /* sentinel */ },
> +};
> +MODULE_DEVICE_TABLE(of, s6e88a0_ams452ef01_of_match);
> +
> +static struct mipi_dsi_driver s6e88a0_ams452ef01_driver = {
> +	.probe = s6e88a0_ams452ef01_probe,
> +	.remove = s6e88a0_ams452ef01_remove,
> +	.driver = {
> +		.name = "panel-s6e88a0-ams452ef01",
> +		.of_match_table = s6e88a0_ams452ef01_of_match,
> +	},
> +};
> +module_mipi_dsi_driver(s6e88a0_ams452ef01_driver);
> +
> +MODULE_AUTHOR("Michael Srba <Michael.Srba@seznam.cz>");
> +MODULE_DESCRIPTION("MIPI-DSI based Panel Driver for AMS452EF01 AMOLED LCD with a S6E88A0 controller");
> +MODULE_LICENSE("GPL v2");
> -- 
> 2.24.0

Re: [PATCH v3 1/2] dt-bindings: display/panel: add bindings for S6E88A0-AMS452EF01

[Sam Ravnborg]

Hi Michael.

I fixed the following:
- added .yaml extension to $id
- added a dsi node to the example, and added #address-cells/size-cells
  to fix dt_binding_check warnings

With these fixes - applied to drm-misc-next.

	Sam

On Thu, Jan 30, 2020 at 09:35:54PM +0100, michael.srba@seznam.cz wrote:
> From: Michael Srba <Michael.Srba@seznam.cz>
> 
> This patch adds dts bindings for Samsung AMS452EF01 AMOLED panel, which makes
> use of their S6E88A0 controller.
> 
> Signed-off-by: Michael Srba <Michael.Srba@seznam.cz>
> ---
> Hi,
> I recall now that tabs cause a syntax error in yaml, should be easy to check 
> in checkpatch.pl?
> I hope there are no more embarassing oversights left.
> 
> Changes in v2: use yaml format for the binding
> Changes in v3: fix oversights too embarassing to admit here
> ---
>  .../panel/samsung,s6e88a0-ams452ef01.yaml     | 46 +++++++++++++++++++
>  1 file changed, 46 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/panel/samsung,s6e88a0-ams452ef01.yaml
> 
> diff --git a/Documentation/devicetree/bindings/display/panel/samsung,s6e88a0-ams452ef01.yaml b/Documentation/devicetree/bindings/display/panel/samsung,s6e88a0-ams452ef01.yaml
> new file mode 100644
> index 000000000000..298fc9a78297
> --- /dev/null
> +++ b/Documentation/devicetree/bindings/display/panel/samsung,s6e88a0-ams452ef01.yaml
> @@ -0,0 +1,46 @@
> +# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
> +%YAML 1.2
> +---
> +$id: http://devicetree.org/schemas/display/panel/samsung,s6e88a0-ams452ef01#
> +$schema: http://devicetree.org/meta-schemas/core.yaml#
> +
> +title: Samsung AMS452EF01 AMOLED panel with S6E88A0 video mode DSI controller
> +
> +maintainers:
> +  - Michael Srba <Michael.Srba@seznam.cz>
> +
> +allOf:
> +  - $ref: panel-common.yaml#
> +
> +properties:
> +  compatible:
> +    const: samsung,s6e88a0-ams452ef01
> +  reg: true
> +  reset-gpios: true
> +  vdd3-supply:
> +     description: core voltage supply
> +  vci-supply:
> +     description: voltage supply for analog circuits
> +
> +required:
> +  - compatible
> +  - reg
> +  - vdd3-supply
> +  - vci-supply
> +  - reset-gpios
> +
> +additionalProperties: false
> +
> +examples:
> +  - |
> +    #include <dt-bindings/gpio/gpio.h>
> +
> +    panel@0 {
> +            reg = <0>;
> +
> +            compatible = "samsung,s6e88a0-ams452ef01";
> +
> +            vdd3-supply = <&pm8916_l17>;
> +            vci-supply = <&reg_vlcd_vci>;
> +            reset-gpios = <&msmgpio 25 GPIO_ACTIVE_HIGH>;
> +    };
> -- 
> 2.24.0

Re: [PATCH v3 1/2] dt-bindings: display/panel: add bindings for S6E88A0-AMS452EF01

[Rob Herring]

On Thu, 30 Jan 2020 21:35:54 +0100, michael.srba@seznam.cz wrote:
> From: Michael Srba <Michael.Srba@seznam.cz>
> 
> This patch adds dts bindings for Samsung AMS452EF01 AMOLED panel, which makes
> use of their S6E88A0 controller.
> 
> Signed-off-by: Michael Srba <Michael.Srba@seznam.cz>
> ---
> Hi,
> I recall now that tabs cause a syntax error in yaml, should be easy to check 
> in checkpatch.pl?
> I hope there are no more embarassing oversights left.
> 
> Changes in v2: use yaml format for the binding
> Changes in v3: fix oversights too embarassing to admit here
> ---
>  .../panel/samsung,s6e88a0-ams452ef01.yaml     | 46 +++++++++++++++++++
>  1 file changed, 46 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/panel/samsung,s6e88a0-ams452ef01.yaml
> 

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

/builds/robherring/linux-dt-review/Documentation/devicetree/bindings/display/panel/samsung,s6e88a0-ams452ef01.yaml: $id: 'http://devicetree.org/schemas/display/panel/samsung,s6e88a0-ams452ef01#' does not match 'http://devicetree.org/schemas/.*\\.yaml#'
Documentation/devicetree/bindings/Makefile:12: recipe for target 'Documentation/devicetree/bindings/display/panel/samsung,s6e88a0-ams452ef01.example.dts' failed
make[1]: *** [Documentation/devicetree/bindings/display/panel/samsung,s6e88a0-ams452ef01.example.dts] Error 1
Makefile:1263: recipe for target 'dt_binding_check' failed
make: *** [dt_binding_check] Error 2

See https://patchwork.ozlabs.org/patch/1231597
Please check and re-submit.