Re: [PATCH v3 3/3] drm/panel-simple: add Gopher 2b LCD panel

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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 <akawolf0@xxxxxxxxx> 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


Signed-off-by: Artjom Vejsel <akawolf0@xxxxxxxxx>
---
 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






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