Since commit 8208181fe536 ("clk: imx: composite-8m:
Add imx8m_divider_determine_rate") the lcdif controller has
had the ability to set the lcdif_pixel rate which propagates
up the tree and sets the video_pll1 rate automatically.
By setting this value low, it will force the recalculation of
video_pll1 to the lowest rate needed by lcdif instead of
dividing a larger clock down to the desired clock speed. This
has the advantage of being able to lower the video_pll1 rate
from 594MHz to 148.5MHz when operating at 1080p. It can go even
lower when operating at lower resolutions and refresh rates.
Signed-off-by: Adam Ford <aford173@xxxxxxxxx>
diff --git a/arch/arm64/boot/dts/freescale/imx8mm.dtsi b/arch/arm64/boot/dts/freescale/imx8mm.dtsi
index a3dae114c20e..669fdd2c54e4 100644
--- a/arch/arm64/boot/dts/freescale/imx8mm.dtsi
+++ b/arch/arm64/boot/dts/freescale/imx8mm.dtsi
@@ -1131,7 +1131,7 @@ lcdif: lcdif@32e00000 {
assigned-clock-parents = <&clk IMX8MM_VIDEO_PLL1_OUT>,
<&clk IMX8MM_SYS_PLL2_1000M>,
<&clk IMX8MM_SYS_PLL1_800M>;
- assigned-clock-rates = <594000000>, <500000000>, <200000000>;
+ assigned-clock-rates = <24000000>, <500000000>, <200000000>;
interrupts = <GIC_SPI 5 IRQ_TYPE_LEVEL_HIGH>;
power-domains = <&disp_blk_ctrl IMX8MM_DISPBLK_PD_LCDIF>;
status = "disabled";
--
2.40.1
