Hi Nicolas, Am 22.03.21 um 19:58 schrieb Nicolas Saenz Julienne: > From: Nicolas Saenz Julienne <[email protected]> > > 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 (a pretty common case). This ends up causing unwarranted > SDHCI CMD hangs when no SD card is present. > > Signed-off-by: Nicolas Saenz Julienne <[email protected]> > --- > arch/arm/boot/dts/bcm2711-rpi-4-b.dts | 6 ++++++ > 1 file changed, 6 insertions(+) > > 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>;
i don't want to bike-shed here, but is there any chance to solve this in clk-bcm2835 in a less hacky way? Anyway thank for taking care of this. Best regards > status = "okay"; > }; >
