[U-Boot] mmc1 not working on Samsung snow chromebook

[Jaehoon Chung]

On 2017년 11월 17일 18:38, Guillaume Gardet wrote:
> 
> 
> Le 17/11/2017 à 10:36, Lukasz Majewski a écrit :
>> On Thu, 16 Nov 2017 13:29:56 +0100
>> Guillaume Gardet <guillaume.gardet at free.fr> wrote:
>>
>>> I found a workaround. If I disable MMC_MODE_HS_52MHz, then it is
>>> working fine.
>>>
>>> I guess there is a better way to implement the following patch ?
>>>
>>> **********************************************************************
>>> diff --git a/drivers/mmc/dw_mmc.c b/drivers/mmc/dw_mmc.c
>>> index 23f642980b..a6a0934eef 100644
>>> --- a/drivers/mmc/dw_mmc.c
>>> +++ b/drivers/mmc/dw_mmc.c
>>> @@ -508,7 +508,8 @@ void dwmci_setup_cfg(struct mmc_config *cfg,
>>> struct dwmci_host *host, cfg->host_caps |= MMC_MODE_4BIT;
>>>                   cfg->host_caps &= ~MMC_MODE_8BIT;
>>>           }
>>> -       cfg->host_caps |= MMC_MODE_HS | MMC_MODE_HS_52MHz;
>>> +       /* MMC_MODE_HS_52MHz is broken (at least) on Samsung Snow, so
>>> disbale it for now */
>>> +       cfg->host_caps |= MMC_MODE_HS;
>> This seems like a workaround. The root cause of the problem is the
>> regression with HS 52MHz....
> 
> Not sure it ever worked on this target.

Could you give me the debug log after enabled DEBUG?

Best Regards,
Jaehoon Chung

> 
> Guillaume
> 
>>
>>>           cfg->b_max = CONFIG_SYS_MMC_MAX_BLK_COUNT;
>>>    }
>>> **********************************************************************
>>>
>>>
>>> Guillaume
>>>
>>>
>>>
>>> Le 15/11/2017 à 11:27, Guillaume Gardet a écrit :
>>>>
>>>> Le 15/11/2017 à 11:22, Guillaume Gardet a écrit :
>>>>> Forgot to Cc ML. Done now.
>>>>>
>>>>>
>>>>> Le 15/11/2017 à 11:14, Guillaume Gardet a écrit :
>>>>>> Hello,
>>>>>>
>>>>>> I tested U-Boot v2017.09 on a Samsung Snow (Chromebook ARM) and
>>>>>> while mmc0 (internal eMMC) is working fine, mmc1 (external SD
>>>>>> slot) does not work. I get the following error for 'mmc dev 1'
>>>>>> command: mmc_init: -110, time 30
>>>> Please also note that on boot (or on 1st 'mmc dev 1' cmd if I stop
>>>> auto-boot), I firstly get: mmc_init: -5, time 39
>>>>
>>>> Then, all next attempts retruns:
>>>>      mmc_init: -110, time 30
>>>>
>>>>
>>>> Guillaume
>>>>
>>>>  
>>>>>> Any idea what could be wrong?
>>>>>>
>>>>>> Guillaume
>>>>>>
>>>>>>   
>>>>>   
>>>>   
>>> _______________________________________________
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>>
>>
>> Best regards,
>>
>> Lukasz Majewski
>>
>> -- 
>>
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