[PATCH v3 0/3] add Gopher 2b LCD panel

The Gopher 2b LCD panel is used in Gopher 2b handhelds.
It's simple panel with NewVision NV3047 driver,
but SPI lines are not connected.
It has no specific name, since it's unique to that handhelds.
lot name at AliExpress: 4.3 inch 40PIN TFT LCD Screen COG
NV3047 Drive IC 480(RGB)*272 No Touch 24Bit RGB Interface

Changelog:
v2: remove .num_modes
v3: sort QiShenglong vendor prefix,
	sort qishenglong_gopher2b_lcd_panel_modes struct

Artjom Vejsel (3):
  dt-bindings: Add QiShenglong vendor prefix
  dt-bindings: Add DT bindings for QiShenglong Gopher 2b panel
  drm/panel-simple: add Gopher 2b LCD panel

 .../bindings/display/panel/panel-simple.yaml  |  2 +
 .../devicetree/bindings/vendor-prefixes.yaml  |  2 +
 drivers/gpu/drm/panel/panel-simple.c          | 43 +++++++++++++++++++
 3 files changed, 47 insertions(+)

--
2.32.0

Add vendor prefix for Shenzhen QiShenglong Industrialist Co., Ltd.
QiShenglong is a Chinese manufacturer of handheld gaming consoles, most of
which run (very old) versions of Linux.
QiShenglong is known as Hamy.

Signed-off-by: Artjom Vejsel <redacted>
---
 Documentation/devicetree/bindings/vendor-prefixes.yaml | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/vendor-prefixes.yaml b/Documentation/devicetree/bindings/vendor-prefixes.yaml
index b868cefc7c55..1d45a2d7a7bb 100644
--- a/Documentation/devicetree/bindings/vendor-prefixes.yaml
+++ b/Documentation/devicetree/bindings/vendor-prefixes.yaml

@@ -926,6 +926,8 @@ patternProperties:
     description: Chengdu Kaixuan Information Technology Co., Ltd.
   "^qiaodian,.*":
     description: QiaoDian XianShi Corporation
+  "^qishenglong,.*":
+    description: Shenzhen QiShenglong Industrialist Co., Ltd.
   "^qnap,.*":
     description: QNAP Systems, Inc.
   "^radxa,.*":

-- 
2.32.0

Add DT bindings for QiShenglong Gopher 2b 4.3" 480(RGB)x272 TFT LCD panel.

Signed-off-by: Artjom Vejsel <redacted>
---
 .../devicetree/bindings/display/panel/panel-simple.yaml         | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/devicetree/bindings/display/panel/panel-simple.yaml b/Documentation/devicetree/bindings/display/panel/panel-simple.yaml
index 3624363938dd..e7f3db118c5d 100644
--- a/Documentation/devicetree/bindings/display/panel/panel-simple.yaml
+++ b/Documentation/devicetree/bindings/display/panel/panel-simple.yaml

@@ -244,6 +244,8 @@ properties:
       - powertip,ph800480t013-idf02
         # QiaoDian XianShi Corporation 4"3 TFT LCD panel
       - qiaodian,qd43003c0-40
+        # Shenzhen QiShenglong Industrialist Co., Ltd. Gopher 2b 4.3" 480(RGB)x272 TFT LCD panel
+      - qishenglong,gopher2b-lcd-panel
         # Rocktech Displays Ltd. RK101II01D-CT 10.1" TFT 1280x800
       - rocktech,rk101ii01d-ct
         # Rocktech Display Ltd. RK070ER9427 800(RGB)x480 TFT LCD panel

-- 
2.32.0

The Gopher 2b LCD panel is used in Gopher 2b handhelds.
It's simple panel with NewVision NV3047 driver, but SPI lines are not connected.
It has no specific name, since it's unique to that handhelds.
lot name at AliExpress: 4.3 inch 40PIN TFT LCD Screen COG NV3047 Drive IC 480(RGB)*272 No Touch 24Bit RGB Interface

Signed-off-by: Artjom Vejsel <redacted>
---
 drivers/gpu/drm/panel/panel-simple.c | 43 ++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index 9b286bd4444f..6b69c0c70814 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c

@@ -3563,6 +3563,46 @@ static const struct panel_desc qd43003c0_40 = {
 	.bus_format = MEDIA_BUS_FMT_RGB888_1X24,
 };
 
+static const struct drm_display_mode qishenglong_gopher2b_lcd_panel_modes[] = {
+	{ /* 60 Hz */
+		.clock = 10800,
+		.hdisplay = 480,
+		.hsync_start = 480 + 77,
+		.hsync_end = 480 + 77 + 41,
+		.htotal = 480 + 77 + 41 + 2,
+		.vdisplay = 272,
+		.vsync_start = 272 + 16,
+		.vsync_end = 272 + 16 + 10,
+		.vtotal = 272 + 16 + 10 + 2,
+		.flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC,
+	},
+	{ /* 50 Hz */
+		.clock = 10800,
+		.hdisplay = 480,
+		.hsync_start = 480 + 17,
+		.hsync_end = 480 + 17 + 41,
+		.htotal = 480 + 17 + 41 + 2,
+		.vdisplay = 272,
+		.vsync_start = 272 + 116,
+		.vsync_end = 272 + 116 + 10,
+		.vtotal = 272 + 116 + 10 + 2,
+		.flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC,
+	},
+};
+
+static const struct panel_desc qishenglong_gopher2b_lcd_panel = {
+	.modes = qishenglong_gopher2b_lcd_panel_modes,
+	.num_modes = ARRAY_SIZE(qishenglong_gopher2b_lcd_panel_modes),
+	.bpc = 8,
+	.size = {
+		.width = 95,
+		.height = 54,
+	},
+	.bus_format = MEDIA_BUS_FMT_RGB888_1X24,
+	.bus_flags = DRM_BUS_FLAG_DE_HIGH | DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE,
+	.connector_type = DRM_MODE_CONNECTOR_DPI,
+};
+
 static const struct display_timing rocktech_rk070er9427_timing = {
 	.pixelclock = { 26400000, 33300000, 46800000 },
 	.hactive = { 800, 800, 800 },

@@ -4651,6 +4691,9 @@ static const struct of_device_id platform_of_match[] = {
 	}, {
 		.compatible = "qiaodian,qd43003c0-40",
 		.data = &qd43003c0_40,
+	}, {
+		.compatible = "qishenglong,gopher2b-lcd-panel",
+		.data = &qishenglong_gopher2b_lcd_panel,
 	}, {
 		.compatible = "rocktech,rk070er9427",
 		.data = &rocktech_rk070er9427,

-- 
2.32.0

Hi Artjom,

Le lun., juil. 26 2021 at 01:15:25 +0300, Artjom Vejsel 
[off-list ref] a écrit :

Add vendor prefix for Shenzhen QiShenglong Industrialist Co., Ltd.
QiShenglong is a Chinese manufacturer of handheld gaming consoles, 
most of
which run (very old) versions of Linux.
QiShenglong is known as Hamy.

Signed-off-by: Artjom Vejsel <redacted>

Reviewed-by: Paul Cercueil <paul@crapouillou.net>

Cheers,
-Paul

Hi Artjom,

Le lun., juil. 26 2021 at 01:15:26 +0300, Artjom Vejsel 
[off-list ref] a écrit :

Add DT bindings for QiShenglong Gopher 2b 4.3" 480(RGB)x272 TFT LCD 
panel.

Signed-off-by: Artjom Vejsel <redacted>

Reviewed-by: Paul Cercueil <paul@crapouillou.net>

Cheers,
-Paul

Le lun., juil. 26 2021 at 01:15:27 +0300, Artjom Vejsel 
[off-list ref] a écrit :

The Gopher 2b LCD panel is used in Gopher 2b handhelds.
It's simple panel with NewVision NV3047 driver, but SPI lines are not 
connected.
It has no specific name, since it's unique to that handhelds.
lot name at AliExpress: 4.3 inch 40PIN TFT LCD Screen COG NV3047 
Drive IC 480(RGB)*272 No Touch 24Bit RGB Interface

Signed-off-by: Artjom Vejsel <redacted>

Reviewed-by: Paul Cercueil <paul@crapouillou.net>

Cheers,
-Paul

Hi Artjom,

Le lun., juil. 26 2021 at 01:15:27 +0300, Artjom Vejsel 
[off-list ref] a écrit :

The Gopher 2b LCD panel is used in Gopher 2b handhelds.
It's simple panel with NewVision NV3047 driver, but SPI lines are not 
connected.
It has no specific name, since it's unique to that handhelds.
lot name at AliExpress: 4.3 inch 40PIN TFT LCD Screen COG NV3047 
Drive IC 480(RGB)*272 No Touch 24Bit RGB Interface

 From what I gathered the Gopher2's LCD panel is the exact same that is 
inside the RS-07 handheld. According to the teardown (in [1]), the 
RS-07 panel is a Amelin AML043056B0-40 (see [2]).

Could you verify that? According to the photos, the product code is 
written on the flexible connector.

If that's the case, instead of using the 
"qishenglong,gopher2b-lcd-panel" compatible string, could you use 
"amelin,aml043056b0-40"?

Cheers,
-Paul

[1]: https://steward-fu.github.io/website/handheld/rs07/teardown.htm
[2]: http://www.amelin.com.cn/en/h-pd-355.html

Hello, Paul!


Thanks for your investigation.

But while this two panels are compatible with the timing set in the 
driver, their timing ranges are different ([1], [2]) and therefore 
should have different compatible strings.


[1]: https://wendangmao.net/doc/753b5635102de2bd960588e2-51.html

[2]: https://www.newhavendisplay.com/appnotes/datasheets/LCDs/ST7282.pdf


Artjom.

On 26/07/2021 12.02, Paul Cercueil wrote:

Hi Artjom,

Le lun., juil. 26 2021 at 01:15:27 +0300, Artjom Vejsel 
[off-list ref] a écrit :

quoted

The Gopher 2b LCD panel is used in Gopher 2b handhelds.
It's simple panel with NewVision NV3047 driver, but SPI lines are not 
connected.
It has no specific name, since it's unique to that handhelds.
lot name at AliExpress: 4.3 inch 40PIN TFT LCD Screen COG NV3047 
Drive IC 480(RGB)*272 No Touch 24Bit RGB Interface

From what I gathered the Gopher2's LCD panel is the exact same that is 
inside the RS-07 handheld. According to the teardown (in [1]), the 
RS-07 panel is a Amelin AML043056B0-40 (see [2]).

Could you verify that? According to the photos, the product code is 
written on the flexible connector.

If that's the case, instead of using the 
"qishenglong,gopher2b-lcd-panel" compatible string, could you use 
"amelin,aml043056b0-40"?

Cheers,
-Paul

[1]: https://steward-fu.github.io/website/handheld/rs07/teardown.htm
[2]: http://www.amelin.com.cn/en/h-pd-355.html

quoted

Signed-off-by: Artjom Vejsel <redacted>
---
 drivers/gpu/drm/panel/panel-simple.c | 43 ++++++++++++++++++++++++++++
 1 file changed, 43 insertions(+)

diff --git a/drivers/gpu/drm/panel/panel-simple.c 

b/drivers/gpu/drm/panel/panel-simple.c
index 9b286bd4444f..6b69c0c70814 100644

--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c

@@ -3563,6 +3563,46 @@ static const struct panel_desc qd43003c0_40 = {

     .bus_format = MEDIA_BUS_FMT_RGB888_1X24,
 };

+static const struct drm_display_mode 
qishenglong_gopher2b_lcd_panel_modes[] = {
+    { /* 60 Hz */
+        .clock = 10800,
+        .hdisplay = 480,
+        .hsync_start = 480 + 77,
+        .hsync_end = 480 + 77 + 41,
+        .htotal = 480 + 77 + 41 + 2,
+        .vdisplay = 272,
+        .vsync_start = 272 + 16,
+        .vsync_end = 272 + 16 + 10,
+        .vtotal = 272 + 16 + 10 + 2,
+        .flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC,
+    },
+    { /* 50 Hz */
+        .clock = 10800,
+        .hdisplay = 480,
+        .hsync_start = 480 + 17,
+        .hsync_end = 480 + 17 + 41,
+        .htotal = 480 + 17 + 41 + 2,
+        .vdisplay = 272,
+        .vsync_start = 272 + 116,
+        .vsync_end = 272 + 116 + 10,
+        .vtotal = 272 + 116 + 10 + 2,
+        .flags = DRM_MODE_FLAG_NVSYNC | DRM_MODE_FLAG_NHSYNC,
+    },
+};
+
+static const struct panel_desc qishenglong_gopher2b_lcd_panel = {
+    .modes = qishenglong_gopher2b_lcd_panel_modes,
+    .num_modes = ARRAY_SIZE(qishenglong_gopher2b_lcd_panel_modes),
+    .bpc = 8,
+    .size = {
+        .width = 95,
+        .height = 54,
+    },
+    .bus_format = MEDIA_BUS_FMT_RGB888_1X24,
+    .bus_flags = DRM_BUS_FLAG_DE_HIGH | 
DRM_BUS_FLAG_PIXDATA_SAMPLE_NEGEDGE,
+    .connector_type = DRM_MODE_CONNECTOR_DPI,
+};
+
 static const struct display_timing rocktech_rk070er9427_timing = {
     .pixelclock = { 26400000, 33300000, 46800000 },
     .hactive = { 800, 800, 800 },

@@ -4651,6 +4691,9 @@ static const struct of_device_id 

platform_of_match[] = {
     }, {
         .compatible = "qiaodian,qd43003c0-40",
         .data = &qd43003c0_40,
+    }, {
+        .compatible = "qishenglong,gopher2b-lcd-panel",
+        .data = &qishenglong_gopher2b_lcd_panel,
     }, {
         .compatible = "rocktech,rk070er9427",
         .data = &rocktech_rk070er9427,
-- 
2.32.0

On Mon, 26 Jul 2021 01:15:25 +0300, Artjom Vejsel wrote:

Add vendor prefix for Shenzhen QiShenglong Industrialist Co., Ltd.
QiShenglong is a Chinese manufacturer of handheld gaming consoles, most of
which run (very old) versions of Linux.
QiShenglong is known as Hamy.

Signed-off-by: Artjom Vejsel <redacted>
---
 Documentation/devicetree/bindings/vendor-prefixes.yaml | 2 ++
 1 file changed, 2 insertions(+)

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

On Mon, Jul 26, 2021 at 01:15:26AM +0300, Artjom Vejsel wrote:

Does 'gopher2b' refer to anything besides this panel? If not, then 
'-lcd-panel' is redundant. Otherwise, '-panel' is redundant. Every LCD 
is a panel.

         # Rocktech Displays Ltd. RK101II01D-CT 10.1" TFT 1280x800
       - rocktech,rk101ii01d-ct
         # Rocktech Display Ltd. RK070ER9427 800(RGB)x480 TFT LCD panel
-- 
2.32.0