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ramips: mt762{0,8}: reduce default MMC clock to 24 MHz

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The upstream mtk-sd driver did not perform specific timing
optimization for MT762x series SoC, hence the SDHC peripheral
of some boards cannot run at too high frequency. Reduce the
maximum clock frequency to fix the mmc read/write error.

Closes: https://github.com/openwrt/openwrt/issues/17364
Signed-off-by: Shiji Yang <yangshiji66@qq.com>
Link: https://github.com/openwrt/openwrt/pull/17375
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
(cherry picked from commit de0c143742)
This commit is contained in:
Shiji Yang 2024-12-25 20:33:23 +08:00 • committed by Hauke Mehrtens
parent fe8812ab96
commit cc733e7e2a
3 changed files with 2 additions and 6 deletions
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2
target/linux/ramips/dts/mt7620a.dtsi
View file

@ -540,7 +540,7 @@
interrupt-parent = <&intc>;
interrupts = <14>;
max-frequency = <48000000>;
max-frequency = <24000000>;
pinctrl-names = "default", "state_uhs";
pinctrl-0 = <&sdhci_pins>;

4
target/linux/ramips/dts/mt7620a_hiwifi_hc5861.dts
View file

@ -108,10 +108,6 @@
};
};
&sdhci {
max-frequency = <24000000>;
};
&wmac {
pinctrl-names = "default", "pa_gpio";
pinctrl-0 = <&pa_pins>;

2
target/linux/ramips/dts/mt7628an.dtsi
View file

@ -394,7 +394,7 @@
interrupt-parent = <&intc>;
interrupts = <14>;
max-frequency = <48000000>;
max-frequency = <24000000>;
pinctrl-names = "default", "state_uhs";
pinctrl-0 = <&sdxc_pins>;