Re: [PATCH 1/3] mmc: fix mmc mode selection for HS-DDR and higher

[Chen-Yu Tsai]

On Thu, Jun 2, 2016 at 2:58 AM, Bjorn Andersson
<bjorn.andersson@xxxxxxxxxx> wrote:
> On Sun, May 29, 2016 at 12:04 AM, Chen-Yu Tsai <wens@xxxxxxxx> wrote:
>> When IS_ERR_VALUE was removed from the mmc core code, it was replaced
>> with a simple not-zero check. This does not work, as the value checked
>> is the return value for mmc_select_bus_width, which returns the set
>> bit width on success. This made eMMC modes higher than HS-DDR unusable.
>>
>> Fix this by checking for a positive return value instead.
>
> mmc_select_bus_width() can return 0 on "success" as well and the
> previous check was !IS_ERR_VALUE(err), which coverts that. So I
> believe these checks should be for err >= 0 rather than just > 0.

>From the comments above the function:
"Zero is returned instead of error value if the wide width is not supported."

The documents I found, which were more vendor datasheets, only list
bit widths 4 and 8 for high speed SDR/DDR and HS200.

Not sure what the MMC spec actually says though, as I do not have
it.

Regards
ChenYu

>
>
> Either way this fixes the boot failures seen on my Qualcomm based
> boards with v4.7-rc1.
>
> Regards,
> Bjorn