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

[Alex Gershgorin]

Hi Ludovic,
As we read the chip ID from CHIPID_CIDR register we get 0x8a5c08c0 (we
use ATSAMA5D27A-CU).


Thanks,
Alex

On Mon, Jan 9, 2017 at 9:19 AM, Ludovic Desroches
<ludovic.desroches at atmel.com> wrote:
> Hi Alex,
>
> Which revision of SoC are you using?
>
> Regards
>
> Ludovic
>
> On Sun, Jan 08, 2017 at 01:53:44PM +0100, Alexandre Belloni wrote:
>> 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
>>
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