mmc: sdhci-of-at91: Internal clock never stabilised

[Alexandre Belloni]

Hi,

I think Cyrille worked on that a few month ago, maybe he has a comment.

On 08/01/2017 at 14:07:53 +0200, Alex Gershgorin wrote :
> Hi All,
> We have two different HW platforms based on SAMA5D2 SoC (SAMA5D2 Xplained
> Board and our own HW).
> On both of them we are facing stabilization of the internal
> clock problem, it does not happen all the time but quite often.
> Please see below my Kernel boot messages:
> 
> sdhci: Copyright(c) Pierre Ossman
> sdhci-pltfm: SDHCI platform and OF driver helper
> sdhci-at91 a0000000.sdio-host: update clk mul to 39 as gck rate is
> 480000000 Hz
> mmc0: Internal clock never stabilised.
> mmc0: Internal clock never stabilised.
> mmc0: SDHCI controller on a0000000.sdio-host [a0000000.sdio-host] using ADMA
> 
> snip
> 
> snip
> 
> Waiting for root device /dev/mmcblk0p2...
> mmc0: Internal clock never stabilised.
> mmc0: Timeout waiting for hardware cmd interrupt.
> sdhci: =========== REGISTER DUMP (mmc0)===========
> sdhci: Sys addr: 0x00000000 | Version:  0x00001502
> sdhci: Blk size: 0x00000000 | Blk cnt:  0x00000000
> sdhci: Argument: 0x00000000 | Trn mode: 0x00000000
> sdhci: Present: 0x01ff0001 | Host ctl: 0x00000001
> sdhci: Power: 0x0000000f | Blk gap:  0x00000000
> sdhci: Wake-up: 0x00000000 | Clock:    0x0000ffe1
> sdhci: Timeout: 0x00000000 | Int stat: 0x00000000
> sdhci: Int enab: 0x00ff0003 | Sig enab: 0x00ff0003
> sdhci: AC12 err: 0x00000000 | Slot int: 0x00000000
> sdhci: Caps: 0x27ec0c8c | Caps_1: 0x00270f77
> sdhci: Cmd: 0x00000000 | Max curr: 0x00000000
> sdhci: Host ctl2: 0x00000000
> sdhci: ADMA Err: 0x00000000 | ADMA Ptr: 0x00000000
> sdhci: ===========================================
> 
> Any direction to solve this problem?
> 
> Thanks,
> Alex Gershgorin

-- 
Alexandre Belloni, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com