[PATCH v4 1/2] dt-bindings: panel: Add Feiyang FY07024DI26A30-D MIPI-DSI LCD panel

[PATCH v4 1/2] dt-bindings: panel: Add Feiyang FY07024DI26A30-D MIPI-DSI LCD panel

[Jagan Teki]

Feiyang FY07024DI26A30-D is 1024x600, 4-lane MIPI-DSI LCD panel.

Add dt-bingings for it.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Reviewed-by: Rob Herring <robh@kernel.org>
---
Changes for v4, v3:
- none
Changes for v2:
- new patch, derived from another dsi series

 .../display/panel/feiyang,fy07024di26a30d.txt | 20 +++++++++++++++++++
 1 file changed, 20 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/panel/feiyang,fy07024di26a30d.txt

diff --git a/Documentation/devicetree/bindings/display/panel/feiyang,fy07024di26a30d.txt b/Documentation/devicetree/bindings/display/panel/feiyang,fy07024di26a30d.txt
new file mode 100644
index 000000000000..82caa7b65ae8
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/panel/feiyang,fy07024di26a30d.txt
@@ -0,0 +1,20 @@
+Feiyang FY07024DI26A30-D 7" MIPI-DSI LCD Panel
+
+Required properties:
+- compatible: must be "feiyang,fy07024di26a30d"
+- reg: DSI virtual channel used by that screen
+- avdd-supply: analog regulator dc1 switch
+- dvdd-supply: 3v3 digital regulator
+- reset-gpios: a GPIO phandle for the reset pin
+
+Optional properties:
+- backlight: phandle for the backlight control.
+
+panel@0 {
+	compatible = "feiyang,fy07024di26a30d";
+	reg = <0>;
+	avdd-supply = <&reg_dc1sw>;
+	dvdd-supply = <&reg_dldo2>;
+	reset-gpios = <&pio 3 24 GPIO_ACTIVE_HIGH>; /* LCD-RST: PD24 */
+	backlight = <&backlight>;
+};
-- 
2.18.0.321.gffc6fa0e3

[PATCH v4 2/2] drm/panel: Add Feiyang FY07024DI26A30-D MIPI-DSI LCD panel

[Jagan Teki]

Feiyang FY07024DI26A30-D is 1024x600, 4-lane MIPI-DSI LCD panel.

Add panel driver for it.

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
---
Changes for v5:
- rebase on master
- adjust the hporch values to satisfy the refresh
Changes for v4:
- use simple structure for command init
- update proper comments on power, reset delay sequnce
- fix to use set_display_off in disable function
- move mode type to structure
- drop refres rate value, let drm compute
Changes for v2:
- new patch, derived from another dsi series

 MAINTAINERS                                   |   6 +
 drivers/gpu/drm/panel/Kconfig                 |   9 +
 drivers/gpu/drm/panel/Makefile                |   1 +
 .../drm/panel/panel-feiyang-fy07024di26a30d.c | 286 ++++++++++++++++++
 4 files changed, 302 insertions(+)
 create mode 100644 drivers/gpu/drm/panel/panel-feiyang-fy07024di26a30d.c

diff --git a/MAINTAINERS b/MAINTAINERS
index e3f785bad68b..5c8591eb5840 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -4831,6 +4831,12 @@ T:	git git://anongit.freedesktop.org/drm/drm-misc
 S:	Maintained
 F:	drivers/gpu/drm/tve200/
 
+DRM DRIVER FOR FEIYANG FY07024DI26A30-D MIPI-DSI LCD PANELS
+M:	Jagan Teki <jagan@amarulasolutions.com>
+S:	Maintained
+F:	drivers/gpu/drm/panel/panel-feiyang-fy07024di26a30d.c
+F:	Documentation/devicetree/bindings/display/panel/feiyang,fy07024di26a30d.txt
+
 DRM DRIVER FOR ILITEK ILI9225 PANELS
 M:	David Lechner <david@lechnology.com>
 S:	Maintained
diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 151ddf720b83..5304db7b7b55 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -47,6 +47,15 @@ config DRM_PANEL_SIMPLE
 	  that it can be automatically turned off when the panel goes into a
 	  low power state.
 
+config DRM_PANEL_FEIYANG_FY07024DI26A30D
+	tristate "Feiyang FY07024DI26A30-D MIPI-DSI LCD panel"
+	depends on OF
+	depends on DRM_MIPI_DSI
+	depends on BACKLIGHT_CLASS_DEVICE
+	help
+	  Say Y if you want to enable support for panels based on the
+	  Feiyang FY07024DI26A30-D MIPI-DSI interface.
+
 config DRM_PANEL_ILITEK_IL9322
 	tristate "Ilitek ILI9322 320x240 QVGA panels"
 	depends on OF && SPI
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index 54db0921f329..c88dacf9d439 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -3,6 +3,7 @@ obj-$(CONFIG_DRM_PANEL_ARM_VERSATILE) += panel-arm-versatile.o
 obj-$(CONFIG_DRM_PANEL_BANANAPI_S070WV20_ICN6211) += panel-bananapi-s070wv20-icn6211.o
 obj-$(CONFIG_DRM_PANEL_LVDS) += panel-lvds.o
 obj-$(CONFIG_DRM_PANEL_SIMPLE) += panel-simple.o
+obj-$(CONFIG_DRM_PANEL_FEIYANG_FY07024DI26A30D) += panel-feiyang-fy07024di26a30d.o
 obj-$(CONFIG_DRM_PANEL_ILITEK_IL9322) += panel-ilitek-ili9322.o
 obj-$(CONFIG_DRM_PANEL_ILITEK_ILI9881C) += panel-ilitek-ili9881c.o
 obj-$(CONFIG_DRM_PANEL_INNOLUX_P079ZCA) += panel-innolux-p079zca.o
diff --git a/drivers/gpu/drm/panel/panel-feiyang-fy07024di26a30d.c b/drivers/gpu/drm/panel/panel-feiyang-fy07024di26a30d.c
new file mode 100644
index 000000000000..f655647aeade
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-feiyang-fy07024di26a30d.c
@@ -0,0 +1,286 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Copyright (C) 2018 Amarula Solutions
+ * Author: Jagan Teki <jagan@amarulasolutions.com>
+ */
+
+#include <linux/backlight.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/of_device.h>
+
+#include <linux/gpio/consumer.h>
+#include <linux/regulator/consumer.h>
+
+#include <drm/drmP.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_panel.h>
+
+#define FEIYANG_INIT_CMD_LEN	2
+
+struct feiyang {
+	struct drm_panel	panel;
+	struct mipi_dsi_device	*dsi;
+
+	struct backlight_device	*backlight;
+	struct regulator	*dvdd;
+	struct regulator	*avdd;
+	struct gpio_desc	*reset;
+};
+
+static inline struct feiyang *panel_to_feiyang(struct drm_panel *panel)
+{
+	return container_of(panel, struct feiyang, panel);
+}
+
+struct feiyang_init_cmd {
+	u8 data[FEIYANG_INIT_CMD_LEN];
+};
+
+static const struct feiyang_init_cmd feiyang_init_cmds[] = {
+	{ .data = { 0x80, 0x58 } },
+	{ .data = { 0x81, 0x47 } },
+	{ .data = { 0x82, 0xD4 } },
+	{ .data = { 0x83, 0x88 } },
+	{ .data = { 0x84, 0xA9 } },
+	{ .data = { 0x85, 0xC3 } },
+	{ .data = { 0x86, 0x82 } },
+};
+
+static int feiyang_prepare(struct drm_panel *panel)
+{
+	struct feiyang *ctx = panel_to_feiyang(panel);
+	struct mipi_dsi_device *dsi = ctx->dsi;
+	unsigned int i;
+	int ret;
+
+	ret = regulator_enable(ctx->dvdd);
+	if (ret)
+		return ret;
+
+	/* T1 (dvdd start + dvdd rise) 0 < T1 <= 10ms */
+	msleep(10);
+
+	ret = regulator_enable(ctx->avdd);
+	if (ret)
+		return ret;
+
+	/* T3 (dvdd rise + avdd start + avdd rise) T3 >= 20ms */
+	msleep(20);
+
+	gpiod_set_value(ctx->reset, 1);
+	msleep(50);
+
+	gpiod_set_value(ctx->reset, 0);
+	/* T5 + T6 (avdd rise + video & logic signal rise)
+	 * T5 >= 10ms, 0 < T6 <= 10ms
+	 */
+	msleep(20);
+
+	gpiod_set_value(ctx->reset, 1);
+
+	/* T12 (video & logic signal rise + backlight rise) T12 >= 200ms */
+	msleep(200);
+
+	for (i = 0; i < ARRAY_SIZE(feiyang_init_cmds); i++) {
+		const struct feiyang_init_cmd *cmd =
+						&feiyang_init_cmds[i];
+
+		ret = mipi_dsi_dcs_write_buffer(dsi, cmd->data,
+						FEIYANG_INIT_CMD_LEN);
+		if (ret < 0)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int feiyang_enable(struct drm_panel *panel)
+{
+	struct feiyang *ctx = panel_to_feiyang(panel);
+
+	/* T12 (video & logic signal rise + backlight rise) T12 >= 200ms */
+	msleep(200);
+
+	mipi_dsi_dcs_set_display_on(ctx->dsi);
+	backlight_enable(ctx->backlight);
+
+	return 0;
+}
+
+static int feiyang_disable(struct drm_panel *panel)
+{
+	struct feiyang *ctx = panel_to_feiyang(panel);
+
+	backlight_disable(ctx->backlight);
+	return mipi_dsi_dcs_set_display_off(ctx->dsi);
+}
+
+static int feiyang_unprepare(struct drm_panel *panel)
+{
+	struct feiyang *ctx = panel_to_feiyang(panel);
+	int ret;
+
+	ret = mipi_dsi_dcs_set_display_off(ctx->dsi);
+	if (ret < 0)
+		DRM_DEV_ERROR(panel->dev, "failed to set display off: %d\n",
+			      ret);
+
+	ret = mipi_dsi_dcs_enter_sleep_mode(ctx->dsi);
+	if (ret < 0)
+		DRM_DEV_ERROR(panel->dev, "failed to enter sleep mode: %d\n",
+			      ret);
+
+	/* T13 (backlight fall + video & logic signal fall) T13 >= 200ms */
+	msleep(200);
+
+	gpiod_set_value(ctx->reset, 0);
+
+	regulator_disable(ctx->avdd);
+
+	/* T11 (dvdd rise to fall) 0 < T11 <= 10ms  */
+	msleep(10);
+
+	regulator_disable(ctx->dvdd);
+
+	return 0;
+}
+
+static const struct drm_display_mode feiyang_default_mode = {
+	.clock = 55000,
+
+	.hdisplay = 1024,
+	.hsync_start = 1024 + 310,
+	.hsync_end = 1024 + 310 + 20,
+	.htotal = 1024 + 310 + 20 + 90,
+
+	.vdisplay = 600,
+	.vsync_start = 600 + 12,
+	.vsync_end = 600 + 12 + 2,
+	.vtotal = 600 + 12 + 2 + 21,
+
+	.type = DRM_MODE_TYPE_DRIVER | DRM_MODE_TYPE_PREFERRED,
+};
+
+static int feiyang_get_modes(struct drm_panel *panel)
+{
+	struct drm_connector *connector = panel->connector;
+	struct feiyang *ctx = panel_to_feiyang(panel);
+	struct drm_display_mode *mode;
+
+	mode = drm_mode_duplicate(panel->drm, &feiyang_default_mode);
+	if (!mode) {
+		DRM_DEV_ERROR(&ctx->dsi->dev, "failed to add mode %ux%ux@%u\n",
+			      feiyang_default_mode.hdisplay,
+			      feiyang_default_mode.vdisplay,
+			      feiyang_default_mode.vrefresh);
+		return -ENOMEM;
+	}
+
+	drm_mode_set_name(mode);
+
+	drm_mode_probed_add(connector, mode);
+
+	return 1;
+}
+
+static const struct drm_panel_funcs feiyang_funcs = {
+	.disable = feiyang_disable,
+	.unprepare = feiyang_unprepare,
+	.prepare = feiyang_prepare,
+	.enable = feiyang_enable,
+	.get_modes = feiyang_get_modes,
+};
+
+static int feiyang_dsi_probe(struct mipi_dsi_device *dsi)
+{
+	struct feiyang *ctx;
+	int ret;
+
+	ctx = devm_kzalloc(&dsi->dev, sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+	mipi_dsi_set_drvdata(dsi, ctx);
+	ctx->dsi = dsi;
+
+	drm_panel_init(&ctx->panel);
+	ctx->panel.dev = &dsi->dev;
+	ctx->panel.funcs = &feiyang_funcs;
+
+	ctx->dvdd = devm_regulator_get(&dsi->dev, "dvdd");
+	if (IS_ERR(ctx->dvdd)) {
+		DRM_DEV_ERROR(&dsi->dev, "Couldn't get dvdd regulator\n");
+		return PTR_ERR(ctx->dvdd);
+	}
+
+	ctx->avdd = devm_regulator_get(&dsi->dev, "avdd");
+	if (IS_ERR(ctx->avdd)) {
+		DRM_DEV_ERROR(&dsi->dev, "Couldn't get avdd regulator\n");
+		return PTR_ERR(ctx->avdd);
+	}
+
+	ctx->reset = devm_gpiod_get(&dsi->dev, "reset", GPIOD_OUT_LOW);
+	if (IS_ERR(ctx->reset)) {
+		DRM_DEV_ERROR(&dsi->dev, "Couldn't get our reset GPIO\n");
+		return PTR_ERR(ctx->reset);
+	}
+
+	ctx->backlight = devm_of_find_backlight(&dsi->dev);
+	if (IS_ERR(ctx->backlight))
+		return PTR_ERR(ctx->backlight);
+
+	ret = drm_panel_add(&ctx->panel);
+	if (ret < 0)
+		goto put_backlight;
+
+	dsi->mode_flags = MIPI_DSI_MODE_VIDEO_BURST;
+	dsi->format = MIPI_DSI_FMT_RGB888;
+	dsi->lanes = 4;
+
+	ret = mipi_dsi_attach(dsi);
+	if (ret < 0)
+		goto panel_remove;
+
+	return ret;
+
+panel_remove:
+	drm_panel_remove(&ctx->panel);
+put_backlight:
+	if (ctx->backlight)
+		put_device(&ctx->backlight->dev);
+
+	return ret;
+}
+
+static int feiyang_dsi_remove(struct mipi_dsi_device *dsi)
+{
+	struct feiyang *ctx = mipi_dsi_get_drvdata(dsi);
+
+	mipi_dsi_detach(dsi);
+	drm_panel_remove(&ctx->panel);
+
+	if (ctx->backlight)
+		put_device(&ctx->backlight->dev);
+
+	return 0;
+}
+
+static const struct of_device_id feiyang_of_match[] = {
+	{ .compatible = "feiyang,fy07024di26a30d", },
+	{ }
+};
+MODULE_DEVICE_TABLE(of, feiyang_of_match);
+
+static struct mipi_dsi_driver feiyang_driver = {
+	.probe = feiyang_dsi_probe,
+	.remove = feiyang_dsi_remove,
+	.driver = {
+		.name = "feiyang-fy07024di26a30d",
+		.of_match_table = feiyang_of_match,
+	},
+};
+module_mipi_dsi_driver(feiyang_driver);
+
+MODULE_AUTHOR("Jagan Teki <jagan@amarulasolutions.com>");
+MODULE_DESCRIPTION("Feiyang FY07024DI26A30-D MIPI-DSI LCD panel");
+MODULE_LICENSE("GPL");
-- 
2.18.0.321.gffc6fa0e3

Re: [PATCH v4 2/2] drm/panel: Add Feiyang FY07024DI26A30-D MIPI-DSI LCD panel

[Sam Ravnborg]

Hi Jagan.

Thanks for this nice patch, a few comments below.

On Fri, Jan 25, 2019 at 12:13:13AM +0530, Jagan Teki wrote:
> Feiyang FY07024DI26A30-D is 1024x600, 4-lane MIPI-DSI LCD panel.
> 
> Add panel driver for it.
> 
> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
> ---
> Changes for v5:
> - rebase on master
> - adjust the hporch values to satisfy the refresh
> Changes for v4:
> - use simple structure for command init
> - update proper comments on power, reset delay sequnce
> - fix to use set_display_off in disable function
> - move mode type to structure
> - drop refres rate value, let drm compute
> Changes for v2:
> - new patch, derived from another dsi series
> 
>  MAINTAINERS                                   |   6 +
>  drivers/gpu/drm/panel/Kconfig                 |   9 +
>  drivers/gpu/drm/panel/Makefile                |   1 +
>  .../drm/panel/panel-feiyang-fy07024di26a30d.c | 286 ++++++++++++++++++
>  4 files changed, 302 insertions(+)
>  create mode 100644 drivers/gpu/drm/panel/panel-feiyang-fy07024di26a30d.c
> 
> diff --git a/MAINTAINERS b/MAINTAINERS
> index e3f785bad68b..5c8591eb5840 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -4831,6 +4831,12 @@ T:	git git://anongit.freedesktop.org/drm/drm-misc
>  S:	Maintained
>  F:	drivers/gpu/drm/tve200/
>  
> +DRM DRIVER FOR FEIYANG FY07024DI26A30-D MIPI-DSI LCD PANELS
> +M:	Jagan Teki <jagan@amarulasolutions.com>
> +S:	Maintained
> +F:	drivers/gpu/drm/panel/panel-feiyang-fy07024di26a30d.c
> +F:	Documentation/devicetree/bindings/display/panel/feiyang,fy07024di26a30d.txt
> +
>  DRM DRIVER FOR ILITEK ILI9225 PANELS
>  M:	David Lechner <david@lechnology.com>
>  S:	Maintained
> diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
> index 151ddf720b83..5304db7b7b55 100644
> --- a/drivers/gpu/drm/panel/Kconfig
> +++ b/drivers/gpu/drm/panel/Kconfig
> @@ -47,6 +47,15 @@ config DRM_PANEL_SIMPLE
>  	  that it can be automatically turned off when the panel goes into a
>  	  low power state.
>  
> +config DRM_PANEL_FEIYANG_FY07024DI26A30D
> +	tristate "Feiyang FY07024DI26A30-D MIPI-DSI LCD panel"
> +	depends on OF
> +	depends on DRM_MIPI_DSI
> +	depends on BACKLIGHT_CLASS_DEVICE
> +	help
> +	  Say Y if you want to enable support for panels based on the
> +	  Feiyang FY07024DI26A30-D MIPI-DSI interface.
> +
>  config DRM_PANEL_ILITEK_IL9322
>  	tristate "Ilitek ILI9322 320x240 QVGA panels"
>  	depends on OF && SPI
> diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
> index 54db0921f329..c88dacf9d439 100644
> --- a/drivers/gpu/drm/panel/Makefile
> +++ b/drivers/gpu/drm/panel/Makefile
> @@ -3,6 +3,7 @@ obj-$(CONFIG_DRM_PANEL_ARM_VERSATILE) += panel-arm-versatile.o
>  obj-$(CONFIG_DRM_PANEL_BANANAPI_S070WV20_ICN6211) += panel-bananapi-s070wv20-icn6211.o
>  obj-$(CONFIG_DRM_PANEL_LVDS) += panel-lvds.o
>  obj-$(CONFIG_DRM_PANEL_SIMPLE) += panel-simple.o
> +obj-$(CONFIG_DRM_PANEL_FEIYANG_FY07024DI26A30D) += panel-feiyang-fy07024di26a30d.o
>  obj-$(CONFIG_DRM_PANEL_ILITEK_IL9322) += panel-ilitek-ili9322.o
>  obj-$(CONFIG_DRM_PANEL_ILITEK_ILI9881C) += panel-ilitek-ili9881c.o
>  obj-$(CONFIG_DRM_PANEL_INNOLUX_P079ZCA) += panel-innolux-p079zca.o
> diff --git a/drivers/gpu/drm/panel/panel-feiyang-fy07024di26a30d.c b/drivers/gpu/drm/panel/panel-feiyang-fy07024di26a30d.c
> new file mode 100644
> index 000000000000..f655647aeade
> --- /dev/null
> +++ b/drivers/gpu/drm/panel/panel-feiyang-fy07024di26a30d.c
> @@ -0,0 +1,286 @@
> +// SPDX-License-Identifier: GPL-2.0+
> +/*
> + * Copyright (C) 2018 Amarula Solutions
> + * Author: Jagan Teki <jagan@amarulasolutions.com>
> + */
> +
> +#include <linux/backlight.h>
> +#include <linux/delay.h>
> +#include <linux/module.h>
> +#include <linux/of_device.h>
> +
> +#include <linux/gpio/consumer.h>
> +#include <linux/regulator/consumer.h>
> +
> +#include <drm/drmP.h>
Please do not use drmP.h in new drivers.
We are slowly gettting rid of it and in drm-misc.git the
drmP.h file no longer contains anything (other than includes/forwards).


> +	gpiod_set_value(ctx->reset, 1);
> +	msleep(50);
> +
> +	gpiod_set_value(ctx->reset, 0);
> +	/* T5 + T6 (avdd rise + video & logic signal rise)
> +	 * T5 >= 10ms, 0 < T6 <= 10ms
> +	 */
> +	msleep(20);
> +
> +	gpiod_set_value(ctx->reset, 1);
Is it really necessary to do a 1 => 0 => 1 cycle here for reset?
panel-simple do not need it.

> +
> +static int feiyang_dsi_probe(struct mipi_dsi_device *dsi)
> +{
> +	struct feiyang *ctx;
> +	int ret;
> +
> +	ctx = devm_kzalloc(&dsi->dev, sizeof(*ctx), GFP_KERNEL);
> +	if (!ctx)
> +		return -ENOMEM;
> +	mipi_dsi_set_drvdata(dsi, ctx);
Add empty line atfer return -ENOMEM;?

> +	ctx->dsi = dsi;
> +
> +	drm_panel_init(&ctx->panel);
> +	ctx->panel.dev = &dsi->dev;
> +	ctx->panel.funcs = &feiyang_funcs;
> +
> +	ctx->dvdd = devm_regulator_get(&dsi->dev, "dvdd");
> +	if (IS_ERR(ctx->dvdd)) {
> +		DRM_DEV_ERROR(&dsi->dev, "Couldn't get dvdd regulator\n");
> +		return PTR_ERR(ctx->dvdd);
> +	}
> +
> +	ctx->avdd = devm_regulator_get(&dsi->dev, "avdd");
> +	if (IS_ERR(ctx->avdd)) {
> +		DRM_DEV_ERROR(&dsi->dev, "Couldn't get avdd regulator\n");
> +		return PTR_ERR(ctx->avdd);
> +	}
> +
> +	ctx->reset = devm_gpiod_get(&dsi->dev, "reset", GPIOD_OUT_LOW);
> +	if (IS_ERR(ctx->reset)) {
> +		DRM_DEV_ERROR(&dsi->dev, "Couldn't get our reset GPIO\n");
> +		return PTR_ERR(ctx->reset);
> +	}
> +
> +	ctx->backlight = devm_of_find_backlight(&dsi->dev);
> +	if (IS_ERR(ctx->backlight))
> +		return PTR_ERR(ctx->backlight);
> +
> +	ret = drm_panel_add(&ctx->panel);
> +	if (ret < 0)
> +		goto put_backlight;
> +
> +	dsi->mode_flags = MIPI_DSI_MODE_VIDEO_BURST;
> +	dsi->format = MIPI_DSI_FMT_RGB888;
> +	dsi->lanes = 4;
> +
> +	ret = mipi_dsi_attach(dsi);
> +	if (ret < 0)
> +		goto panel_remove;
> +
> +	return ret;
> +
> +panel_remove:
> +	drm_panel_remove(&ctx->panel);
> +put_backlight:
> +	if (ctx->backlight)
> +		put_device(&ctx->backlight->dev);
As devm_of_find_backlight() is used the put_device() will be done for you.
No need to do it here.
I think the same is true for the panel.

> +
> +	return ret;
> +}
> +
> +static int feiyang_dsi_remove(struct mipi_dsi_device *dsi)
> +{
> +	struct feiyang *ctx = mipi_dsi_get_drvdata(dsi);
> +
> +	mipi_dsi_detach(dsi);
> +	drm_panel_remove(&ctx->panel);
> +
> +	if (ctx->backlight)
> +		put_device(&ctx->backlight->dev);

Likewise, use of devm_of_find_backlight() will do this for you.

	Sam

Re: [v4,2/2] drm/panel: Add Feiyang FY07024DI26A30-D MIPI-DSI LCD panel

[Bhushan Shah]

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On Fri, Jan 25, 2019 at 12:13:13AM +0530, Jagan Teki wrote:
> Feiyang FY07024DI26A30-D is 1024x600, 4-lane MIPI-DSI LCD panel.
> 
> Add panel driver for it.
> 
> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>

Tested-by: Bhushan Shah <bshah@kde.org>

-- 
Bhushan Shah
http://blog.bshah.in
IRC Nick : bshah on Freenode
GPG key fingerprint : 0AAC 775B B643 7A8D 9AF7 A3AC FE07 8411 7FBC E11D

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