Hi, Le mardi 27 septembre 2016 à 13:53 -0700, Vagrant Cascadian a écrit : > This essentially mimics what was done with rk3288-veyron-minnie in > commit 984926781122f034d5bc9962815d135b6c4a8e1d. > > The eMMC of the speedy Chromebook also appears to need the same tuning > workaround, as it frequently fails to recognize the eMMC without it. I have a device where (without this patch) eMMC sometimes fails, with: [ 3.561010] dwmmc_rockchip ff0f0000.dwmmc: Successfully tuned phase to 175 [ 3.571742] mmc2: new HS200 MMC card at address 0001 [ 3.571943] mmcblk2: mmc2:0001 HAG2e 14.7 GiB [ 3.572026] mmcblk2boot0: mmc2:0001 HAG2e partition 1 4.00 MiB [ 3.572107] mmcblk2boot1: mmc2:0001 HAG2e partition 2 4.00 MiB [ 3.572181] mmcblk2rpmb: mmc2:0001 HAG2e partition 3 4.00 MiB [ 3.685647] mmcblk2: error -110 transferring data, sector 0, nr 8, cmd response 0x900, card status 0x0 And sometimes works, with: [ 3.451058] dwmmc_rockchip ff0f0000.dwmmc: Successfully tuned phase to 176 [ 3.491093] mmc2: new HS200 MMC card at address 0001 [ 3.491277] mmcblk2: mmc2:0001 HAG2e 14.7 GiB [ 3.491345] mmcblk2boot0: mmc2:0001 HAG2e partition 1 4.00 MiB [ 3.491409] mmcblk2boot1: mmc2:0001 HAG2e partition 2 4.00 MiB [ 3.491474] mmcblk2rpmb: mmc2:0001 HAG2e partition 3 4.00 MiB [ 3.493548] mmcblk2: p1 p2 However, with this change, it always fails, with: [ 3.322129] mmc_host mmc2: Bus speed (slot 0) = 50000000Hz (slot req 52000000Hz, actual 50000000HZ div = 0) [ 3.333174] mmc2: error -110 whilst initialising MMC card I don't have so much time to investigate this issue, but it's clear that this patch doesn't fix the issue (and actually worsens it) for my device. Cheers! > Signed-off-by: Vagrant Cascadian <vagrantc@xxxxxxxxxxx> > --- > Changes in v2: > - Added Signed-off-by. > > arch/arm/boot/dts/rk3288-veyron-speedy.dts | 5 +++++ > 1 file changed, 5 insertions(+) > > diff --git a/arch/arm/boot/dts/rk3288-veyron-speedy.dts > b/arch/arm/boot/dts/rk3288-veyron-speedy.dts > index a0d033f..500fd18 100644 > --- a/arch/arm/boot/dts/rk3288-veyron-speedy.dts > +++ b/arch/arm/boot/dts/rk3288-veyron-speedy.dts > @@ -124,6 +124,11 @@ > &sdmmc_bus4>; > }; > > + > +&emmc { > + /delete-property/mmc-hs200-1_8v; > +}; > + > &vcc_5v { > enable-active-high; > gpio = <&gpio7 21 GPIO_ACTIVE_HIGH>; > _______________________________________________ > Linux-rockchip mailing list > Linux-rockchip@xxxxxxxxxxxxxxxxxxx > http://lists.infradead.org/mailman/listinfo/linux-rockchip -- Paul Kocialkowski, developer of free digital technology at the lower levels Website: https://www.paulk.fr/ Coding blog: https://code.paulk.fr/ Git repositories: https://git.paulk.fr/ https://git.code.paulk.fr/
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