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ramips: mt7621: reduce MMC clock to 48 MHz

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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 <daniel@makrotopia.org>
This commit is contained in:
Daniel Golle 2024-07-12 02:38:53 +01:00
parent 238aa35c49
commit 04818d5857
1 changed files with 1 additions and 1 deletions
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2
target/linux/ramips/dts/mt7621.dtsi
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@ -365,7 +365,7 @@
interrupt-parent = <&gic>;
interrupts = <GIC_SHARED 20 IRQ_TYPE_LEVEL_HIGH>;
max-frequency = <50000000>;
max-frequency = <48000000>;
pinctrl-names = "default", "state_uhs";
pinctrl-0 = <&sdhci_pins>;