linux-kernel - [PATCH 1/8] arm64: dts: imx8mp-skov-revb-mi1010ait-1cp1: Add panel-timing node to panel node

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Message-Id: <20240930052903.168881-2-victor.liu@nxp.com>
Date: Mon, 30 Sep 2024 13:28:56 +0800
From: Liu Ying <victor.liu@....com>
To: dri-devel@...ts.freedesktop.org,
	devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	imx@...ts.linux.dev,
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Subject: [PATCH 1/8] arm64: dts: imx8mp-skov-revb-mi1010ait-1cp1: Add panel-timing node to panel node

Add a panel-timing node to panel node to override any fixed display
modes written in a panel driver.  This way, 68.9MHz clock frequency
specified in panel-timing node may accommodate 7-fold 482.3MHz
"media_ldb" clock which is derived from 964.6MHz "video_pll1" clock.
The above clock frequencies align to the clock rates assigned in the
lvds_bridge node and media_blk_ctrl node in this DT file.

This should be able to suppress this LDB driver warning:
[   17.206644] fsl-ldb 32ec0000.blk-ctrl:bridge@5c: Configured LDB clock (70000000 Hz) does not match requested LVDS clock: 490000000 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: 6d382d51d979 ("arm64: dts: freescale: Add SKOV IMX8MP CPU revB board")
Signed-off-by: Liu Ying <victor.liu@....com>
---
 .../freescale/imx8mp-skov-revb-mi1010ait-1cp1.dts | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx8mp-skov-revb-mi1010ait-1cp1.dts b/arch/arm64/boot/dts/freescale/imx8mp-skov-revb-mi1010ait-1cp1.dts
index 3c2efdc59bfa..4e9f76de7462 100644
--- a/arch/arm64/boot/dts/freescale/imx8mp-skov-revb-mi1010ait-1cp1.dts
+++ b/arch/arm64/boot/dts/freescale/imx8mp-skov-revb-mi1010ait-1cp1.dts
@@ -13,6 +13,21 @@ panel {
 		backlight = <&backlight>;
 		power-supply = <&reg_tft_vcom>;
 
+		panel-timing {
+			clock-frequency = <68900000>;
+			hactive = <1280>;
+			vactive = <800>;
+			hfront-porch = <30>;
+			hback-porch = <30>;
+			hsync-len = <10>;
+			vfront-porch = <5>;
+			vback-porch = <5>;
+			vsync-len = <5>;
+			hsync-active = <0>;
+			vsync-active = <0>;
+			de-active = <1>;
+		};
+
 		port {
 			in_lvds0: endpoint {
 				remote-endpoint = <&ldb_lvds_ch0>;
-- 
2.34.1