diff mbox series

[RFC,1/2] ARM: dts: Fix-up EMMC2 controller's frequency

Message ID 20210225095216.28591-2-nsaenzjulienne@suse.de
State New
Headers show
Series sdhci-iproc CMD timeouts | expand

Commit Message

Nicolas Saenz Julienne Feb. 25, 2021, 9:52 a.m. UTC
Force emmc2's frequency to 150MHz as the default 100MHz (set by FW)
seems to interfere with the VPU clock when setup at frequencies bigger
than 500MHz, causing unwarranted SDHCI CMD hangs when no SD card is
present.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
---
 arch/arm/boot/dts/bcm2711-rpi-4-b.dts | 6 ++++++
 1 file changed, 6 insertions(+)
diff mbox series

Patch

diff --git a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
index 3b4ab947492a..9aa8408d9960 100644
--- a/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
+++ b/arch/arm/boot/dts/bcm2711-rpi-4-b.dts
@@ -257,6 +257,12 @@  &emmc2 {
 	vqmmc-supply = <&sd_io_1v8_reg>;
 	vmmc-supply = <&sd_vcc_reg>;
 	broken-cd;
+	/*
+	 * Force the frequency to 150MHz as the default 100MHz seems to
+	 * interfere with the VPU clock when setup at frequencies bigger than
+	 * 500MHz, causing unwarranted CMD hangs.
+	 */
+	clock-frequency = <150000000>;
 	status = "okay";
 };