[PATCH v3] mmc: dw_mmc: rockchip: Set the drive phase properly

Enric Balletbo Serra eballetbo at gmail.com
Thu May 19 09:53:09 PDT 2016

2016-05-13 0:52 GMT+02:00 Heiko Stuebner <heiko at sntech.de>:
> Am Donnerstag, 12. Mai 2016, 11:31:50 schrieb Douglas Anderson:
> [...]
>> In commit 7a03fe6f48f3 ("clk: rockchip: reset init state before mmc card
>> initialization") we actually started setting this explicitly in the
>> kernel, but that commit wasn't quite right and also wasn't quite
>> enough.  See <https://patchwork.kernel.org/patch/9085311/> for some
>> details.
>> Let's explicitly set this phase in dw_mmc.
> [...]
>> Fixes: 7a03fe6f48f3 ("clk: rockchip: reset init state before mmc card
>> initialization") Signed-off-by: Douglas Anderson <dianders at chromium.org>
>> Reviewed-by: Shawn Lin <shawn.lin at rock-chips.com>
> I've tested this patch together with the two clock patches linked above on a
> rk3288-firefly and a rk3288-veyron-jerry. On the firefly tuning still does not
> work (probably really some regulator issue) and on veyron tuning still works
> as expected, so
> Tested-by: Heiko Stuebner <heiko at sntech.de>
> Doug's explanations both in the commit message and the code look sane to me,
> but I don't feel confident enough in my understanding of the matter to
> transform that into a Reviewed-by tag.

I've tested this patch on rock2 square inserting some uSD cards and
seeing that they still enumerate properly, also I booted from a uSD
Note that in current state UHS is not supported so the tuning is not
executed. Enable UHS on rock2 requires some work, I'll try to look at
it but meanwhile I can say that doesn't break current state, so

Tested-by: Enric Balletbo i Serra <enric.balletbo at collabora.com>

> Heiko
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