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

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: openwrt/openwrt#17364 Signed-off-by: Shiji Yang <[email protected]> Link: openwrt/openwrt#17375 Signed-off-by: Hauke Mehrtens <[email protected]>
lede-project · Dec 26, 2024 · de0c143 · de0c143
1 parent df222e5
commit de0c143
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Showing 3 changed files with 2 additions and 6 deletions.
diff --git a/target/linux/ramips/dts/mt7620a.dtsi b/target/linux/ramips/dts/mt7620a.dtsi
@@ -540,7 +540,7 @@
 		interrupt-parent = <&intc>;
 		interrupts = <14>;
 
-		max-frequency = <48000000>;
+		max-frequency = <24000000>;
 
 		pinctrl-names = "default", "state_uhs";
 		pinctrl-0 = <&sdhci_pins>;

diff --git a/target/linux/ramips/dts/mt7620a_hiwifi_hc5861.dts b/target/linux/ramips/dts/mt7620a_hiwifi_hc5861.dts
@@ -108,10 +108,6 @@
 	};
 };
 
-&sdhci {
-	max-frequency = <24000000>;
-};
-
 &wmac {
 	pinctrl-names = "default", "pa_gpio";
 	pinctrl-0 = <&pa_pins>;

diff --git a/target/linux/ramips/dts/mt7628an.dtsi b/target/linux/ramips/dts/mt7628an.dtsi
@@ -394,7 +394,7 @@
 		interrupt-parent = <&intc>;
 		interrupts = <14>;
 
-		max-frequency = <48000000>;
+		max-frequency = <24000000>;
 
 		pinctrl-names = "default", "state_uhs";
 		pinctrl-0 = <&sdxc_pins>;