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arm64: dts: imx8mm: Slow default video_pll1 clock rate

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Since commit 8208181fe5 ("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@gmail.com>
Reviewed-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Tested-by: Frieder Schrempf <frieder.schrempf@kontron.de> # Kontron BL i.MX8MM
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Adam Ford 2023-11-27 22:54:15 -06:00 committed by Shawn Guo
parent 5b28b39dda
commit a0deedcc0c
1 changed files with 1 additions and 1 deletions
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2
arch/arm64/boot/dts/freescale/imx8mm.dtsi
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@ -1133,7 +1133,7 @@ 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";