linux-kernel - Re: [PATCH] arm64: dts: imx8mn: Slow default video

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Message-ID: <ZdqyZCudSlazj7gW@dragon>
Date: Sun, 25 Feb 2024 11:22:12 +0800
From: Shawn Guo <shawnguo2@...h.net>
To: Adam Ford <aford173@...il.com>
Cc: linux-arm-kernel@...ts.infradead.org, marex@...x.de,
	aford@...conembedded.com, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
	Conor Dooley <conor+dt@...nel.org>, Shawn Guo <shawnguo@...nel.org>,
	Sascha Hauer <s.hauer@...gutronix.de>,
	Pengutronix Kernel Team <kernel@...gutronix.de>,
	Fabio Estevam <festevam@...il.com>,
	NXP Linux Team <linux-imx@....com>, devicetree@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm64: dts: imx8mn: Slow default video_pll clock rate

On Sun, Feb 11, 2024 at 05:15:08PM -0600, Adam Ford wrote:
> Since commit 8208181fe536 ("clk: imx: composite-8m:
> Add imx8m_divider_determine_rate") the lcdif controller has
> had the ability to set the disp_pixel_clk rate which propagates
> up the tree and sets the video_pll rate automatically.
> 
> By setting this value low, it will force the recalculation of
> video_pll 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_pll 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@...il.com>

Applied, thanks!