6.15-stable review patch. If anyone has any objections, please let me know.
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From: Adam Ford aford173@gmail.com
[ Upstream commit e16ad6c79906bba5e2ac499492b6a5b29ab19d6c ]
The reference manual for the i.MX8MN states the clock rate in MMC mode is 1/2 of the input clock, therefore to properly run at HS400 rates, the input clock must be 400MHz to operate at 200MHz. Currently the clock is set to 200MHz which is half the rate it should be, so the throughput is half of what it should be for HS400 operation.
Fixes: 36ca3c8ccb53 ("arm64: dts: imx: Add Beacon i.MX8M Nano development kit") Signed-off-by: Adam Ford aford173@gmail.com Reviewed-by: Fabio Estevam festevam@gmail.com Signed-off-by: Shawn Guo shawnguo@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- arch/arm64/boot/dts/freescale/imx8mn-beacon-som.dtsi | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/arm64/boot/dts/freescale/imx8mn-beacon-som.dtsi b/arch/arm64/boot/dts/freescale/imx8mn-beacon-som.dtsi index bb11590473a4..353d0c9ff35c 100644 --- a/arch/arm64/boot/dts/freescale/imx8mn-beacon-som.dtsi +++ b/arch/arm64/boot/dts/freescale/imx8mn-beacon-som.dtsi @@ -297,6 +297,8 @@ &usdhc3 { pinctrl-0 = <&pinctrl_usdhc3>; pinctrl-1 = <&pinctrl_usdhc3_100mhz>; pinctrl-2 = <&pinctrl_usdhc3_200mhz>; + assigned-clocks = <&clk IMX8MN_CLK_USDHC3>; + assigned-clock-rates = <400000000>; bus-width = <8>; non-removable; status = "okay";