Messages in this thread | | | Subject | Re: [PATCH 4/4] ARM: dts: Fix-up EMMC2 controller's frequency | From | Scott Branden <> | Date | Mon, 22 Mar 2021 12:06:09 -0700 |
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1st line of commit should be ARM: dts: bcm2711
On 2021-03-22 11:58 a.m., Nicolas Saenz Julienne wrote: > From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de> > > 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 <nsaenz@kernel.org> > --- > 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>; > status = "okay"; > }; > >
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