[PATCH v2 0/4] drm/panel: Support for OSD101T2045-53TS and OSD101T2587-53TS

[PATCH v2 0/4] drm/panel: Support for OSD101T2045-53TS and OSD101T2587-53TS

[Peter Ujfalusi]

Hi,

Changes since v1 (only panel-osd-osd101t2587-53ts changed):
- Removed unused members from struct osd101t2587_panel
- Use backlight_enable/backlight_disable
- Use devm_of_find_backlight()
- osd101t2587_of_match table standardized 
- osd101t2587_panel_unprepare() added to shutdown and remove callbacks to turn
  power off
- Fix probe in case mipi_dsi_attach() would fail

Add support for OSD101T2045-53TS and OSD101T2587-53TS from One Stop Displays.

The two panel is similar with one big difference: OSD101T2587-53TS requires the
MIPI_DSI_TURN_ON_PERIPHERAL message, thus can not be handled by panel-simple.

Regards,
Peter
---
Peter Ujfalusi (4):
  dt-bindings: display: Add bindings for OSD101T2045-53TS
  drm/panel: simple: Add support for OSD101T2045-53TS
  dt-bindings: display: Add bindings for OSD101T2587-53TS panel
  drm/panel: Add OSD101T2587-53TS driver

 .../display/panel/osd,osd101t2045-53ts.txt    |  11 +
 .../display/panel/osd,osd101t2587-53ts.txt    |  14 +
 drivers/gpu/drm/panel/Kconfig                 |   6 +
 drivers/gpu/drm/panel/Makefile                |   1 +
 .../drm/panel/panel-osd-osd101t2587-53ts.c    | 254 ++++++++++++++++++
 drivers/gpu/drm/panel/panel-simple.c          |  34 +++
 6 files changed, 320 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/panel/osd,osd101t2045-53ts.txt
 create mode 100644 Documentation/devicetree/bindings/display/panel/osd,osd101t2587-53ts.txt
 create mode 100644 drivers/gpu/drm/panel/panel-osd-osd101t2587-53ts.c

-- 
Peter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

[PATCH v2 1/4] dt-bindings: display: Add bindings for OSD101T2045-53TS

[Peter Ujfalusi]

This adds the device-tree bindings for the OSD101T2045-53TS 10.1"
1920x1200 panel from One Stop Displays.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
---
 .../bindings/display/panel/osd,osd101t2045-53ts.txt   | 11 +++++++++++
 1 file changed, 11 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/panel/osd,osd101t2045-53ts.txt

diff --git a/Documentation/devicetree/bindings/display/panel/osd,osd101t2045-53ts.txt b/Documentation/devicetree/bindings/display/panel/osd,osd101t2045-53ts.txt
new file mode 100644
index 000000000000..b3f6df59f7c1
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/panel/osd,osd101t2045-53ts.txt
@@ -0,0 +1,11 @@
+One Stop Displays OSD101T2045-53TS 10.1" 1920x1200 panel
+
+Required properties:
+- compatible: should be "osd,osd101t2045-53ts"
+- power-supply: as specified in the base binding
+
+Optional properties:
+- backlight: as specified in the base binding
+
+This binding is compatible with the simple-panel binding, which is specified
+in simple-panel.txt in this directory.
-- 
Peter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

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Re: [PATCH v2 1/4] dt-bindings: display: Add bindings for OSD101T2045-53TS

[Rob Herring]

On Fri, 22 Feb 2019 15:16:15 +0200, Peter Ujfalusi wrote:
> This adds the device-tree bindings for the OSD101T2045-53TS 10.1"
> 1920x1200 panel from One Stop Displays.
> 
> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
> ---
>  .../bindings/display/panel/osd,osd101t2045-53ts.txt   | 11 +++++++++++
>  1 file changed, 11 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/panel/osd,osd101t2045-53ts.txt
> 

Reviewed-by: Rob Herring <robh@kernel.org>
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[PATCH v2 2/4] drm/panel: simple: Add support for OSD101T2045-53TS

[Peter Ujfalusi]

Add support for the OSD101T2045-53TS 10.1" 1920x1200 panel from One Stop
Displays to the panel-simple driver

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
---
 drivers/gpu/drm/panel/panel-simple.c | 34 ++++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index 9e8218f6a3f2..0337583ffa49 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -2996,6 +2996,37 @@ static const struct panel_desc_dsi panasonic_vvx10f004b00 = {
 	.lanes = 4,
 };
 
+static const struct drm_display_mode osd101t2045_53ts_mode = {
+	.clock = 154500,
+	.hdisplay = 1920,
+	.hsync_start = 1920 + 112,
+	.hsync_end = 1920 + 112 + 16,
+	.htotal = 1920 + 112 + 16 + 32,
+	.vdisplay = 1200,
+	.vsync_start = 1200 + 16,
+	.vsync_end = 1200 + 16 + 2,
+	.vtotal = 1200 + 16 + 2 + 16,
+	.vrefresh = 60,
+	.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
+};
+
+static const struct panel_desc_dsi osd101t2045_53ts = {
+	.desc = {
+		.modes = &osd101t2045_53ts_mode,
+		.num_modes = 1,
+		.bpc = 8,
+		.size = {
+			.width = 217,
+			.height = 136,
+		},
+	},
+	.flags = MIPI_DSI_MODE_VIDEO | MIPI_DSI_MODE_VIDEO_BURST |
+		 MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
+		 MIPI_DSI_MODE_EOT_PACKET,
+	.format = MIPI_DSI_FMT_RGB888,
+	.lanes = 4,
+};
+
 static const struct of_device_id dsi_of_match[] = {
 	{
 		.compatible = "auo,b080uan01",
@@ -3012,6 +3043,9 @@ static const struct of_device_id dsi_of_match[] = {
 	}, {
 		.compatible = "panasonic,vvx10f004b00",
 		.data = &panasonic_vvx10f004b00
+	}, {
+		.compatible = "osd,osd101t2045-53ts",
+		.data = &osd101t2045_53ts
 	}, {
 		/* sentinel */
 	}
-- 
Peter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

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[PATCH v2 3/4] dt-bindings: display: Add bindings for OSD101T2587-53TS panel

[Peter Ujfalusi]

This adds the device-tree bindings for the OSD101T2587-53TS 10.1"
1920x1200 panel from One Stop Displays.

Note: the panel is similar to OSD101T2045-53TS, but it needs additional
MIPI_DSI_TURN_ON_PERIPHERAL message from the host.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
---
 .../display/panel/osd,osd101t2587-53ts.txt         | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/display/panel/osd,osd101t2587-53ts.txt

diff --git a/Documentation/devicetree/bindings/display/panel/osd,osd101t2587-53ts.txt b/Documentation/devicetree/bindings/display/panel/osd,osd101t2587-53ts.txt
new file mode 100644
index 000000000000..2082cae1a0e3
--- /dev/null
+++ b/Documentation/devicetree/bindings/display/panel/osd,osd101t2587-53ts.txt
@@ -0,0 +1,14 @@
+One Stop Displays OSD101T2587-53TS 10.1" 1920x1200 panel
+
+The panel is similar to OSD101T2045-53TS, but it needs additional
+MIPI_DSI_TURN_ON_PERIPHERAL message from the host.
+
+Required properties:
+- compatible: should be "osd,osd101t2587-53ts"
+- power-supply: as specified in the base binding
+
+Optional properties:
+- backlight: as specified in the base binding
+
+This binding is compatible with the simple-panel binding, which is specified
+in simple-panel.txt in this directory.
-- 
Peter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

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Re: [PATCH v2 3/4] dt-bindings: display: Add bindings for OSD101T2587-53TS panel

[Rob Herring]

On Fri, 22 Feb 2019 15:16:17 +0200, Peter Ujfalusi wrote:
> This adds the device-tree bindings for the OSD101T2587-53TS 10.1"
> 1920x1200 panel from One Stop Displays.
> 
> Note: the panel is similar to OSD101T2045-53TS, but it needs additional
> MIPI_DSI_TURN_ON_PERIPHERAL message from the host.
> 
> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
> ---
>  .../display/panel/osd,osd101t2587-53ts.txt         | 14 ++++++++++++++
>  1 file changed, 14 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/display/panel/osd,osd101t2587-53ts.txt
> 

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

[PATCH v2 4/4] drm/panel: Add OSD101T2587-53TS driver

[Peter Ujfalusi]

The panel is similar to OSD101T2045-53TS (which is handled by panel-simple)
with one big difference: osd101t2587-53ts needs MIPI_DSI_TURN_ON_PERIPHERAL
message to be sent from the host to be operational and thus can not be
handled by panel-simple.

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
---
 drivers/gpu/drm/panel/Kconfig                 |   6 +
 drivers/gpu/drm/panel/Makefile                |   1 +
 .../drm/panel/panel-osd-osd101t2587-53ts.c    | 254 ++++++++++++++++++
 3 files changed, 261 insertions(+)
 create mode 100644 drivers/gpu/drm/panel/panel-osd-osd101t2587-53ts.c

diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
index 3e070153ef21..351661920838 100644
--- a/drivers/gpu/drm/panel/Kconfig
+++ b/drivers/gpu/drm/panel/Kconfig
@@ -122,6 +122,12 @@ config DRM_PANEL_ORISETECH_OTM8009A
 	  Say Y here if you want to enable support for Orise Technology
 	  otm8009a 480x800 dsi 2dl panel.
 
+config DRM_PANEL_OSD_OSD101T2587_53TS
+	tristate "OSD OSD101T2587-53TS DSI 1920x1200 video mode panel"
+	depends on OF
+	depends on DRM_MIPI_DSI
+	depends on BACKLIGHT_CLASS_DEVICE
+
 config DRM_PANEL_PANASONIC_VVX10F034N00
 	tristate "Panasonic VVX10F034N00 1920x1200 video mode panel"
 	depends on OF
diff --git a/drivers/gpu/drm/panel/Makefile b/drivers/gpu/drm/panel/Makefile
index e7ab71968bbf..d9d99956db0c 100644
--- a/drivers/gpu/drm/panel/Makefile
+++ b/drivers/gpu/drm/panel/Makefile
@@ -10,6 +10,7 @@ obj-$(CONFIG_DRM_PANEL_KINGDISPLAY_KD097D04) += panel-kingdisplay-kd097d04.o
 obj-$(CONFIG_DRM_PANEL_LG_LG4573) += panel-lg-lg4573.o
 obj-$(CONFIG_DRM_PANEL_OLIMEX_LCD_OLINUXINO) += panel-olimex-lcd-olinuxino.o
 obj-$(CONFIG_DRM_PANEL_ORISETECH_OTM8009A) += panel-orisetech-otm8009a.o
+obj-$(CONFIG_DRM_PANEL_OSD_OSD101T2587_53TS) += panel-osd-osd101t2587-53ts.o
 obj-$(CONFIG_DRM_PANEL_PANASONIC_VVX10F034N00) += panel-panasonic-vvx10f034n00.o
 obj-$(CONFIG_DRM_PANEL_RASPBERRYPI_TOUCHSCREEN) += panel-raspberrypi-touchscreen.o
 obj-$(CONFIG_DRM_PANEL_RAYDIUM_RM68200) += panel-raydium-rm68200.o
diff --git a/drivers/gpu/drm/panel/panel-osd-osd101t2587-53ts.c b/drivers/gpu/drm/panel/panel-osd-osd101t2587-53ts.c
new file mode 100644
index 000000000000..196a2a883d17
--- /dev/null
+++ b/drivers/gpu/drm/panel/panel-osd-osd101t2587-53ts.c
@@ -0,0 +1,254 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ *  Copyright (C) 2019 Texas Instruments Incorporated - http://www.ti.com
+ *  Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
+ */
+
+#include <linux/backlight.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/regulator/consumer.h>
+
+#include <drm/drm_device.h>
+#include <drm/drm_crtc.h>
+#include <drm/drm_mipi_dsi.h>
+#include <drm/drm_panel.h>
+
+#include <video/mipi_display.h>
+
+struct osd101t2587_panel {
+	struct drm_panel base;
+	struct mipi_dsi_device *dsi;
+
+	struct backlight_device *backlight;
+	struct regulator *supply;
+
+	bool prepared;
+	bool enabled;
+
+	const struct drm_display_mode *default_mode;
+};
+
+static inline struct osd101t2587_panel *to_osd101t2587_panel(struct drm_panel *panel)
+{
+	return container_of(panel, struct osd101t2587_panel, base);
+}
+
+static int osd101t2587_panel_disable(struct drm_panel *panel)
+{
+	struct osd101t2587_panel *osd101t2587 = to_osd101t2587_panel(panel);
+	int ret;
+
+	if (!osd101t2587->enabled)
+		return 0;
+
+	backlight_disable(osd101t2587->backlight);
+
+	ret = mipi_dsi_shutdown_peripheral(osd101t2587->dsi);
+
+	osd101t2587->enabled = false;
+
+	return ret;
+}
+
+static int osd101t2587_panel_unprepare(struct drm_panel *panel)
+{
+	struct osd101t2587_panel *osd101t2587 = to_osd101t2587_panel(panel);
+
+	if (!osd101t2587->prepared)
+		return 0;
+
+	regulator_disable(osd101t2587->supply);
+	osd101t2587->prepared = false;
+
+	return 0;
+}
+
+static int osd101t2587_panel_prepare(struct drm_panel *panel)
+{
+	struct osd101t2587_panel *osd101t2587 = to_osd101t2587_panel(panel);
+	int ret;
+
+	if (osd101t2587->prepared)
+		return 0;
+
+	ret = regulator_enable(osd101t2587->supply);
+	if (!ret)
+		osd101t2587->prepared = true;
+
+	return ret;
+}
+
+static int osd101t2587_panel_enable(struct drm_panel *panel)
+{
+	struct osd101t2587_panel *osd101t2587 = to_osd101t2587_panel(panel);
+	int ret;
+
+	if (osd101t2587->enabled)
+		return 0;
+
+	ret = mipi_dsi_turn_on_peripheral(osd101t2587->dsi);
+	if (ret)
+		return ret;
+
+	backlight_enable(osd101t2587->backlight);
+
+	osd101t2587->enabled = true;
+
+	return ret;
+}
+
+static const struct drm_display_mode default_mode_osd101t2587 = {
+	.clock = 164400,
+	.hdisplay = 1920,
+	.hsync_start = 1920 + 152,
+	.hsync_end = 1920 + 152 + 52,
+	.htotal = 1920 + 152 + 52 + 20,
+	.vdisplay = 1200,
+	.vsync_start = 1200 + 24,
+	.vsync_end = 1200 + 24 + 6,
+	.vtotal = 1200 + 24 + 6 + 48,
+	.vrefresh = 60,
+	.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC,
+};
+
+static int osd101t2587_panel_get_modes(struct drm_panel *panel)
+{
+	struct osd101t2587_panel *osd101t2587 = to_osd101t2587_panel(panel);
+	struct drm_display_mode *mode;
+
+	mode = drm_mode_duplicate(panel->drm, osd101t2587->default_mode);
+	if (!mode) {
+		dev_err(panel->drm->dev, "failed to add mode %ux%ux@%u\n",
+			osd101t2587->default_mode->hdisplay,
+			osd101t2587->default_mode->vdisplay,
+			osd101t2587->default_mode->vrefresh);
+		return -ENOMEM;
+	}
+
+	drm_mode_set_name(mode);
+
+	drm_mode_probed_add(panel->connector, mode);
+
+	panel->connector->display_info.width_mm = 217;
+	panel->connector->display_info.height_mm = 136;
+
+	return 1;
+}
+
+static const struct drm_panel_funcs osd101t2587_panel_funcs = {
+	.disable = osd101t2587_panel_disable,
+	.unprepare = osd101t2587_panel_unprepare,
+	.prepare = osd101t2587_panel_prepare,
+	.enable = osd101t2587_panel_enable,
+	.get_modes = osd101t2587_panel_get_modes,
+};
+
+static const struct of_device_id osd101t2587_of_match[] = {
+	{
+		.compatible = "osd,osd101t2587-53ts",
+		.data = &default_mode_osd101t2587,
+	}, {
+		/* sentinel */
+	}
+};
+MODULE_DEVICE_TABLE(of, osd101t2587_of_match);
+
+static int osd101t2587_panel_add(struct osd101t2587_panel *osd101t2587)
+{
+	struct device *dev = &osd101t2587->dsi->dev;
+
+	osd101t2587->supply = devm_regulator_get(dev, "power");
+	if (IS_ERR(osd101t2587->supply))
+		return PTR_ERR(osd101t2587->supply);
+
+	osd101t2587->backlight = devm_of_find_backlight(dev);
+	if (IS_ERR(osd101t2587->backlight))
+		return PTR_ERR(osd101t2587->backlight);
+
+	drm_panel_init(&osd101t2587->base);
+	osd101t2587->base.funcs = &osd101t2587_panel_funcs;
+	osd101t2587->base.dev = &osd101t2587->dsi->dev;
+
+	return drm_panel_add(&osd101t2587->base);
+}
+
+static int osd101t2587_panel_probe(struct mipi_dsi_device *dsi)
+{
+	struct osd101t2587_panel *osd101t2587;
+	const struct of_device_id *id;
+	int ret;
+
+	id = of_match_node(osd101t2587_of_match, dsi->dev.of_node);
+	if (!id)
+		return -ENODEV;
+
+	dsi->lanes = 4;
+	dsi->format = MIPI_DSI_FMT_RGB888;
+	dsi->mode_flags = MIPI_DSI_MODE_VIDEO |
+			  MIPI_DSI_MODE_VIDEO_BURST |
+			  MIPI_DSI_MODE_VIDEO_SYNC_PULSE |
+			  MIPI_DSI_MODE_EOT_PACKET;
+
+	osd101t2587 = devm_kzalloc(&dsi->dev, sizeof(*osd101t2587), GFP_KERNEL);
+	if (!osd101t2587)
+		return -ENOMEM;
+
+	mipi_dsi_set_drvdata(dsi, osd101t2587);
+
+	osd101t2587->dsi = dsi;
+	osd101t2587->default_mode = id->data;
+
+	ret = osd101t2587_panel_add(osd101t2587);
+	if (ret < 0)
+		return ret;
+
+	ret = mipi_dsi_attach(dsi);
+	if (ret)
+		drm_panel_remove(&osd101t2587->base);
+
+	return ret;
+}
+
+static int osd101t2587_panel_remove(struct mipi_dsi_device *dsi)
+{
+	struct osd101t2587_panel *osd101t2587 = mipi_dsi_get_drvdata(dsi);
+	int ret;
+
+	ret = osd101t2587_panel_disable(&osd101t2587->base);
+	if (ret < 0)
+		dev_warn(&dsi->dev, "failed to disable panel\n");
+
+	osd101t2587_panel_unprepare(&osd101t2587->base);
+
+	drm_panel_remove(&osd101t2587->base);
+
+	ret = mipi_dsi_detach(dsi);
+	if (ret < 0)
+		dev_warn(&dsi->dev, "failed to detach from DSI host\n");
+
+	return ret;
+}
+
+static void osd101t2587_panel_shutdown(struct mipi_dsi_device *dsi)
+{
+	struct osd101t2587_panel *osd101t2587 = mipi_dsi_get_drvdata(dsi);
+
+	osd101t2587_panel_disable(&osd101t2587->base);
+	osd101t2587_panel_unprepare(&osd101t2587->base);
+}
+
+static struct mipi_dsi_driver osd101t2587_panel_driver = {
+	.driver = {
+		.name = "panel-osd-osd101t2587-53ts",
+		.of_match_table = osd101t2587_of_match,
+	},
+	.probe = osd101t2587_panel_probe,
+	.remove = osd101t2587_panel_remove,
+	.shutdown = osd101t2587_panel_shutdown,
+};
+module_mipi_dsi_driver(osd101t2587_panel_driver);
+
+MODULE_AUTHOR("Peter Ujfalusi <peter.ujfalusi@ti.com>");
+MODULE_DESCRIPTION("OSD101T2587-53TS DSI panel");
+MODULE_LICENSE("GPL v2");
-- 
Peter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki

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Re: [PATCH v2 4/4] drm/panel: Add OSD101T2587-53TS driver

[Sam Ravnborg]

Hi Peter.

Driver looks to be in good shape now.
With the few comments below addressed you can add my:
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>

	Sam

On Fri, Feb 22, 2019 at 03:16:18PM +0200, Peter Ujfalusi wrote:
> The panel is similar to OSD101T2045-53TS (which is handled by panel-simple)
> with one big difference: osd101t2587-53ts needs MIPI_DSI_TURN_ON_PERIPHERAL
> message to be sent from the host to be operational and thus can not be
> handled by panel-simple.
> 
> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
> ---
>  drivers/gpu/drm/panel/Kconfig                 |   6 +
>  drivers/gpu/drm/panel/Makefile                |   1 +
>  .../drm/panel/panel-osd-osd101t2587-53ts.c    | 254 ++++++++++++++++++
>  3 files changed, 261 insertions(+)
>  create mode 100644 drivers/gpu/drm/panel/panel-osd-osd101t2587-53ts.c
> 
> diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
> index 3e070153ef21..351661920838 100644
> --- a/drivers/gpu/drm/panel/Kconfig
> +++ b/drivers/gpu/drm/panel/Kconfig
> @@ -122,6 +122,12 @@ config DRM_PANEL_ORISETECH_OTM8009A
>  	  Say Y here if you want to enable support for Orise Technology
>  	  otm8009a 480x800 dsi 2dl panel.
>  
> +config DRM_PANEL_OSD_OSD101T2587_53TS
> +	tristate "OSD OSD101T2587-53TS DSI 1920x1200 video mode panel"
> +	depends on OF
> +	depends on DRM_MIPI_DSI
> +	depends on BACKLIGHT_CLASS_DEVICE
Please add a help-text

> +
> +static int osd101t2587_panel_unprepare(struct drm_panel *panel)
> +{
> +	struct osd101t2587_panel *osd101t2587 = to_osd101t2587_panel(panel);
> +
> +	if (!osd101t2587->prepared)
> +		return 0;
> +
> +	regulator_disable(osd101t2587->supply);
> +	osd101t2587->prepared = false;
> +
> +	return 0;
> +}
> +
> +static int osd101t2587_panel_prepare(struct drm_panel *panel)
> +{
> +	struct osd101t2587_panel *osd101t2587 = to_osd101t2587_panel(panel);
> +	int ret;
> +
> +	if (osd101t2587->prepared)
> +		return 0;
> +
> +	ret = regulator_enable(osd101t2587->supply);
> +	if (!ret)
> +		osd101t2587->prepared = true;

Logic is wrong here. regulator_enable() will return a negative value on error
and 0 in the good case.
So osd101t2587->prepared is set to true only in the error case, not in the good case.


> +
> +	ret = mipi_dsi_attach(dsi);
> +	if (ret)
> +		drm_panel_remove(&osd101t2587->base);

I do not see panel-simple.c do a drm_panel_remove() if mipi_dsi_attach() fails.
Maybe the driver core will call remove() is probe fails?
Or maybe panel-simple() should call drm_panel_remove()

Keep the above as is - I just wanted to express that this looks different
from the panle-simple() driver.

> +static int osd101t2587_panel_remove(struct mipi_dsi_device *dsi)
> +{
> +	struct osd101t2587_panel *osd101t2587 = mipi_dsi_get_drvdata(dsi);
> +	int ret;
> +
> +	ret = osd101t2587_panel_disable(&osd101t2587->base);
> +	if (ret < 0)
> +		dev_warn(&dsi->dev, "failed to disable panel\n");
This is already warned in lower layers and I think you could
drop the dev_warn().

> +
> +	osd101t2587_panel_unprepare(&osd101t2587->base);
> +
> +	drm_panel_remove(&osd101t2587->base);
> +
> +	ret = mipi_dsi_detach(dsi);
> +	if (ret < 0)
> +		dev_warn(&dsi->dev, "failed to detach from DSI host\n");
Add error code in logging.

Re: [PATCH v2 4/4] drm/panel: Add OSD101T2587-53TS driver

[Peter Ujfalusi]

Hi Sam,

On 23/02/2019 21.38, Sam Ravnborg wrote:
> Hi Peter.
> 
> Driver looks to be in good shape now.
> With the few comments below addressed you can add my:
> Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
> 
> 	Sam
> 
> On Fri, Feb 22, 2019 at 03:16:18PM +0200, Peter Ujfalusi wrote:
>> The panel is similar to OSD101T2045-53TS (which is handled by panel-simple)
>> with one big difference: osd101t2587-53ts needs MIPI_DSI_TURN_ON_PERIPHERAL
>> message to be sent from the host to be operational and thus can not be
>> handled by panel-simple.
>>
>> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
>> ---
>>  drivers/gpu/drm/panel/Kconfig                 |   6 +
>>  drivers/gpu/drm/panel/Makefile                |   1 +
>>  .../drm/panel/panel-osd-osd101t2587-53ts.c    | 254 ++++++++++++++++++
>>  3 files changed, 261 insertions(+)
>>  create mode 100644 drivers/gpu/drm/panel/panel-osd-osd101t2587-53ts.c
>>
>> diff --git a/drivers/gpu/drm/panel/Kconfig b/drivers/gpu/drm/panel/Kconfig
>> index 3e070153ef21..351661920838 100644
>> --- a/drivers/gpu/drm/panel/Kconfig
>> +++ b/drivers/gpu/drm/panel/Kconfig
>> @@ -122,6 +122,12 @@ config DRM_PANEL_ORISETECH_OTM8009A
>>  	  Say Y here if you want to enable support for Orise Technology
>>  	  otm8009a 480x800 dsi 2dl panel.
>>  
>> +config DRM_PANEL_OSD_OSD101T2587_53TS
>> +	tristate "OSD OSD101T2587-53TS DSI 1920x1200 video mode panel"
>> +	depends on OF
>> +	depends on DRM_MIPI_DSI
>> +	depends on BACKLIGHT_CLASS_DEVICE
> Please add a help-text

Sure, I forgot this.

>> +
>> +static int osd101t2587_panel_unprepare(struct drm_panel *panel)
>> +{
>> +	struct osd101t2587_panel *osd101t2587 = to_osd101t2587_panel(panel);
>> +
>> +	if (!osd101t2587->prepared)
>> +		return 0;
>> +
>> +	regulator_disable(osd101t2587->supply);
>> +	osd101t2587->prepared = false;
>> +
>> +	return 0;
>> +}
>> +
>> +static int osd101t2587_panel_prepare(struct drm_panel *panel)
>> +{
>> +	struct osd101t2587_panel *osd101t2587 = to_osd101t2587_panel(panel);
>> +	int ret;
>> +
>> +	if (osd101t2587->prepared)
>> +		return 0;
>> +
>> +	ret = regulator_enable(osd101t2587->supply);
>> +	if (!ret)
>> +		osd101t2587->prepared = true;
> 
> Logic is wrong here. regulator_enable() will return a negative value on error
> and 0 in the good case.
> So osd101t2587->prepared is set to true only in the error case, not in the good case.

It is good as it is:
'if (!0)' == 'if (1)'
'if (!-X)' == 'if (0)'

>> +
>> +	ret = mipi_dsi_attach(dsi);
>> +	if (ret)
>> +		drm_panel_remove(&osd101t2587->base);
> 
> I do not see panel-simple.c do a drm_panel_remove() if mipi_dsi_attach() fails.
> Maybe the driver core will call remove() is probe fails?
> Or maybe panel-simple() should call drm_panel_remove()
> 
> Keep the above as is - I just wanted to express that this looks different
> from the panle-simple() driver.

I have a patch for panel-simple as well with the following commit message:
"drm/panel: simple: Fix panel_simple_dsi_probe

In case mipi_dsi_attach() fails remove the registered panel to avoid
added panel without corresponding device."

It has the same bug.

>> +static int osd101t2587_panel_remove(struct mipi_dsi_device *dsi)
>> +{
>> +	struct osd101t2587_panel *osd101t2587 = mipi_dsi_get_drvdata(dsi);
>> +	int ret;
>> +
>> +	ret = osd101t2587_panel_disable(&osd101t2587->base);
>> +	if (ret < 0)
>> +		dev_warn(&dsi->dev, "failed to disable panel\n");
> This is already warned in lower layers and I think you could
> drop the dev_warn().

I think there is no warning from lower layer, but not sure as I never
hit this case.

>> +
>> +	osd101t2587_panel_unprepare(&osd101t2587->base);
>> +
>> +	drm_panel_remove(&osd101t2587->base);
>> +
>> +	ret = mipi_dsi_detach(dsi);
>> +	if (ret < 0)
>> +		dev_warn(&dsi->dev, "failed to detach from DSI host\n");
> Add error code in logging.

OK

- Péter

Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki.
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