[U-Boot] [PATCH 1/1] sunxi: mmc: Fix phase delays

[Jagan Teki]

On Thu, Mar 29, 2018 at 6:52 PM, Maxime Ripard
<maxime.ripard at bootlin.com> wrote:
> On Tue, Mar 27, 2018 at 04:57:23PM +0300, Stefan Mavrodiev wrote:
>> U-boot driver for sunxi-mmc uses PLL6, unlike linux kernel where
>> PLL5 is used, with clock rates respectively 600MHz and 768MHz.
>> Thus there are different phase degree steps - 24 for the kernel and
>> 30 for u-boot.
>>
>> In the kernel driver the phase is set 90 deg for output and 120 for
>> sample. Dividing by 30 will result values 3 and 4. Those are the
>> values set in the u-boot driver.
>>
>> However, the condition defining delays is wrong. MMC core driver
>> requests clock of 52MHz, sunxi-driver sets clock of 50MHz, but
>> phase is set 30 deg for output and 120 deg for sample.
>>
>> Apparently this works for most cards.
>> On A20-SOM204-EVB-eMMC there is eMMC card (KLMAG2GEND) which complains
>> about it. Maybe there is other boards with similar problem?
>> So the fix is to match delays for both u-boot and kernel.
>>
>> Signed-off-by: Stefan Mavrodiev <stefan at olimex.com>
>
> Acked-by: Maxime Ripard <maxime.ripard at bootlin.com>

Applied to u-boot-sunxi/master