Re: [PATCH v2 2/9] arm64: dts: imx8mp-phyboard-pollux-rdk: Add panel-timing node to panel-lvds node

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On 10/12/24 9:35 AM, Liu Ying wrote:
Add a panel-timing node to panel-lvds node to override any fixed
display modes written in a panel driver.  This way, 74.25MHz clock
frequency specified in panel-timing node may accommodate 7-fold
519.75MHz "media_ldb" clock which is derived from 1.0395GHz
"video_pll1" clock.

This should suppress this LDB driver warning:
[   17.923709] fsl-ldb 32ec0000.blk-ctrl:bridge@5c: Configured LDB clock (72400000 Hz) does not match requested LVDS clock: 506800000 Hz

This also makes the display mode used by the panel pass mode validation
against pixel clock rate and "media_ldb" clock rate in a certain display
driver.

Fixes: 326d86e197fc ("arm64: dts: imx8mp-phyboard-pollux-rdk: add etml panel support")
Signed-off-by: Liu Ying <victor.liu@xxxxxxx>
---
v2:
* No change.

  .../dts/freescale/imx8mp-phyboard-pollux-rdk.dts  | 15 +++++++++++++++
  1 file changed, 15 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mp-phyboard-pollux-rdk.dts b/arch/arm64/boot/dts/freescale/imx8mp-phyboard-pollux-rdk.dts
index 50debe821c42..20cb5363cccb 100644
--- a/arch/arm64/boot/dts/freescale/imx8mp-phyboard-pollux-rdk.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mp-phyboard-pollux-rdk.dts
@@ -37,6 +37,21 @@ panel1_lvds: panel-lvds {
  		backlight = <&backlight_lvds>;
  		power-supply = <&reg_vcc_3v3_sw>;
+ panel-timing {
+			clock-frequency = <74250000>;
+			hactive = <1280>;
+			vactive = <800>;
+			hfront-porch = <72>;
+			hback-porch = <86>;
+			hsync-len = <2>;
+			vfront-porch = <15>;
+			vback-porch = <21>;
+			vsync-len = <2>;
+			hsync-active = <0>;
+			vsync-active = <0>;
+			de-active = <1>;
+		};
There is an existing entry for this panel in panel-simple.c , please do not duplicate timings in the DT:

drivers/gpu/drm/panel/panel-simple.c:static const struct panel_desc edt_etml1010g3dra = { drivers/gpu/drm/panel/panel-simple.c: .timings = &edt_etml1010g3dra_timing, drivers/gpu/drm/panel/panel-simple.c: .compatible = "edt,etml1010g3dra",



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