| Message ID | 20180426105046.14817-1-jbrunet@baylibre.com |
|---|---|
| State | Accepted |
| Commit | d5b4885b1dff72ac670b518cfeaac719d768bd4d |
| Headers | show |
| Series | ARM64: dts: meson: disable sd-uhs modes on the libretech-cc | expand |
Jerome Brunet <jbrunet@baylibre.com> writes: > There is a problem with the sd-uhs mode when doing a soft reboot. > Switching back from 1.8v to 3.3v messes with the card, which no longer > respond (timeout errors). According to the specification, we should > perform a card reset (power cycling the card) but this is something we > cannot control on this design. > > Then the only solution to restore the communication with the card is an > "unplug-plug" which is not acceptable > > Until we find a solution, if any, disable the sd-uhs modes on this design. > For the people using uhs at the moment, there will a performance drop as > a result. > > Fixes: 3cde63ebc85c ("ARM64: dts: meson-gxl: libretech-cc: enable high speed modes") > Signed-off-by: Jerome Brunet <jbrunet@baylibre.com> Applied to v4.17/fixes, and adding a Cc to stable. Thanks, Kevin -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/arch/arm64/boot/dts/amlogic/meson-gxl-s905x-libretech-cc.dts b/arch/arm64/boot/dts/amlogic/meson-gxl-s905x-libretech-cc.dts index 3e3eb31748a3..f63bceb88caa 100644 --- a/arch/arm64/boot/dts/amlogic/meson-gxl-s905x-libretech-cc.dts +++ b/arch/arm64/boot/dts/amlogic/meson-gxl-s905x-libretech-cc.dts @@ -234,9 +234,6 @@ bus-width = <4>; cap-sd-highspeed; - sd-uhs-sdr12; - sd-uhs-sdr25; - sd-uhs-sdr50; max-frequency = <100000000>; disable-wp;
There is a problem with the sd-uhs mode when doing a soft reboot. Switching back from 1.8v to 3.3v messes with the card, which no longer respond (timeout errors). According to the specification, we should perform a card reset (power cycling the card) but this is something we cannot control on this design. Then the only solution to restore the communication with the card is an "unplug-plug" which is not acceptable Until we find a solution, if any, disable the sd-uhs modes on this design. For the people using uhs at the moment, there will a performance drop as a result. Fixes: 3cde63ebc85c ("ARM64: dts: meson-gxl: libretech-cc: enable high speed modes") Signed-off-by: Jerome Brunet <jbrunet@baylibre.com> --- arch/arm64/boot/dts/amlogic/meson-gxl-s905x-libretech-cc.dts | 3 --- 1 file changed, 3 deletions(-) -- 2.14.3 -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html