| Message ID | 20170801152224.15754-1-jbrunet@baylibre.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Jerome Brunet <jbrunet@baylibre.com> writes: > Changing the card voltage on the p200 is not instantaneous, especially > when switching from 3.3v to 1.8v. > > I take at least 70ms for the regulator to go from 3.3v to 1.8v. Add > margin to that to make sure we don't upset the sdcard during the voltage > switch > > Fixes: ef8d2ffedf18 ("ARM64: dts: meson-gxbb: add MMC support") > Signed-off-by: Jerome Brunet <jbrunet@baylibre.com> Applied to v4.14/dt64, Thanks, Kevin
diff --git a/arch/arm64/boot/dts/amlogic/meson-gxbb-p20x.dtsi b/arch/arm64/boot/dts/amlogic/meson-gxbb-p20x.dtsi index 9603a635c7af..d3b194c20b72 100644 --- a/arch/arm64/boot/dts/amlogic/meson-gxbb-p20x.dtsi +++ b/arch/arm64/boot/dts/amlogic/meson-gxbb-p20x.dtsi @@ -84,6 +84,9 @@ /* Based on P200 schematics, signal CARD_1.8V/3.3V_CTR */ states = <1800000 0 3300000 1>; + + regulator-settling-time-up-us = <10000>; + regulator-settling-time-down-us = <150000>; }; vddio_boot: regulator-vddio_boot {
Changing the card voltage on the p200 is not instantaneous, especially when switching from 3.3v to 1.8v. I take at least 70ms for the regulator to go from 3.3v to 1.8v. Add margin to that to make sure we don't upset the sdcard during the voltage switch Fixes: ef8d2ffedf18 ("ARM64: dts: meson-gxbb: add MMC support") Signed-off-by: Jerome Brunet <jbrunet@baylibre.com> --- arch/arm64/boot/dts/amlogic/meson-gxbb-p20x.dtsi | 3 +++ 1 file changed, 3 insertions(+)