linux-kernel - Re: [PATCH 1/7] arm64: dts: imx8mm-venice-gw700x: Increase HS400 USDHC clock speed

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Message-ID: <aHDFiN8dn8zVnmZl@dragon>
Date: Fri, 11 Jul 2025 16:04:24 +0800
From: Shawn Guo <shawnguo2@...h.net>
To: Tim Harvey <tharvey@...eworks.com>
Cc: linux-arm-kernel@...ts.infradead.org, Rob Herring <robh@...nel.org>,
	Krzysztof Kozlowski <krzk+dt@...nel.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>, devicetree@...r.kernel.org,
	imx@...ts.linux.dev, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH 1/7] arm64: dts: imx8mm-venice-gw700x: Increase HS400
 USDHC clock speed

On Mon, Jul 07, 2025 at 01:16:56PM -0700, Tim Harvey wrote:
> The IMX8M reference manuals indicate in the USDHC Clock generator section
> that the clock rate for DDR is 1/2 the input clock therefore HS400 rates
> clocked at 200Mhz require a 400Mhz SDHC clock.
> 
> This showed about a 1.5x improvement in read performance for the eMMC's
> used on the various imx8m{m,n,p}-venice boards.
> 
> Fixes: 6f30b27c5ef5 ("arm64: dts: imx8mm: Add Gateworks i.MX 8M Mini Development Kits")
> Signed-off-by: Tim Harvey <tharvey@...eworks.com>

Applied all, thanks!