linux-kernel - [PATCH 2/8] arm64: dts: imx8mp-phyboard-pollux-rdk: Add panel-timing node to panel-lvds node

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Message-Id: <20240930052903.168881-3-victor.liu@nxp.com>
Date: Mon, 30 Sep 2024 13:28:57 +0800
From: Liu Ying <victor.liu@....com>
To: dri-devel@...ts.freedesktop.org,
	devicetree@...r.kernel.org,
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Subject: [PATCH 2/8] arm64: dts: imx8mp-phyboard-pollux-rdk: Add panel-timing node to panel-lvds node

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@....com>
---
 .../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>;
+		};
+
 		port {
 			panel1_in: endpoint {
 				remote-endpoint = <&ldb_lvds_ch1>;
-- 
2.34.1