[PATCH] arm64: dts: allwinner: a523: x96qpro+: overvolting eMMC
Andre Przywara <[email protected]>
| Newsgroups | dev.linux.lists.linux-sunxi,org.infradead.lists.linux-arm-kernel,org.kernel.vger.linux-devicetree,org.kernel.vger.linux-kernel |
|---|---|
| Message-ID | <[email protected]> |
On the X96QPro+ TV box, the eMMC wasn't working properly: the chip would be detected, but most requests failed, leaving it unusable. Some "solutions" were circulating downstream, one "popular" one is severely limiting the clock frequency, with a drastic performance impact. Instead slightly bumping the I/O voltage on PortC from the canonical 1.8V to 1.9V seemed to do the trick: the eMMC now works and reaches the expected 120MB/s performance. Adjust the respective regulator voltage in the .dts to enable eMMC operation on that device. Signed-off-by: Andre Przywara <[email protected]> --- Hi, I am not super happy with this patch, but it seems to be a pragmatic and the least hacky solution I have seen. Cheers, Andre arch/arm64/boot/dts/allwinner/sun55i-h728-x96qpro+.dts | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm64/boot/dts/allwinner/sun55i-h728-x96qpro+.dts b/arch/arm64/boot/dts/allwinner/sun55i-h728-x96qpro+.dts index a96927fbdadd5..5636e95312218 100644 --- a/arch/arm64/boot/dts/allwinner/sun55i-h728-x96qpro+.dts +++ b/arch/arm64/boot/dts/allwinner/sun55i-h728-x96qpro+.dts @@ -194,8 +194,8 @@ reg_bldo4: bldo4 { reg_cldo1: cldo1 { regulator-always-on; - regulator-min-microvolt = <1800000>; - regulator-max-microvolt = <1800000>; + regulator-min-microvolt = <1900000>; + regulator-max-microvolt = <1900000>; regulator-name = "vcc-codec-sd"; }; -- 2.46.4