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

[Bjorn Andersson]

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.


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

Regards,
Bjorn