From 04818d5857ae69350ad2e00dc57eade174f64422 Mon Sep 17 00:00:00 2001 From: Daniel Golle Date: Fri, 12 Jul 2024 02:38:53 +0100 Subject: [PATCH] ramips: mt7621: reduce MMC clock to 48 MHz The switch to the upstream mmc-mtk driver caused problems with MT7621 because of unstable too high clock frequency: [ 49.643291] mmc0: error -88 whilst initialising SD card [ 49.890047] mmc0: error -88 whilst initialising SD card [ 50.142414] mmc0: error -88 whilst initialising SD card [ 50.419218] mmc0: error -88 whilst initialising SD card ... Fix this by reducing the clock speed to 48 MHz instead of 50 MHz, which is also the value used in upstream Linux mt7621.dtsi. With that change applied SD cards work as expected on MT7621 devices also with the new driver. Signed-off-by: Daniel Golle --- target/linux/ramips/dts/mt7621.dtsi | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/target/linux/ramips/dts/mt7621.dtsi b/target/linux/ramips/dts/mt7621.dtsi index 033ba95dd7..da992bada4 100644 --- a/target/linux/ramips/dts/mt7621.dtsi +++ b/target/linux/ramips/dts/mt7621.dtsi @@ -365,7 +365,7 @@ interrupt-parent = <&gic>; interrupts = ; - max-frequency = <50000000>; + max-frequency = <48000000>; pinctrl-names = "default", "state_uhs"; pinctrl-0 = <&sdhci_pins>;