Re: [PATCH v2] ARM: dts: rockchip: temporarily remove emmc hs200 speed from rk3288-veyron-speedy.

Am Sonntag, 16. Oktober 2016, 21:49:43 schrieb Paul Kocialkowski:

Hi,

Le mardi 27 septembre 2016 à 13:53 -0700, Vagrant Cascadian a écrit :

quoted

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.

thanks for the heads up.

As discussed on IRC we now have varying reports of the emmc working or not 
working with and without that patch applied. So it's not really a bandaid fix 
and I've thus dropped this patch again.

Still hoping someone will find the source of the problem somewhere :-)


Heiko
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html