Hi Marek,
On Wed, 20 Feb 2019 at 16:49, Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> wrote:
>
> The maximum voltage value for BUCK8 regulator on Odroid XU3/4 boards is
> set too low. Increase it to the 2000mV as specified on the board schematic.
> So far the board worked fine, because of the bug in the PMIC driver, which
> used incorrect step value for that regulator. It interpreted the voltage
> value set by the bootloader as 1500mV and kept it unchanged. The regulator
> driver has been however fixed recently in the commit 56b5d4ea778c
> ("regulator: s2mps11: Fix steps for buck7, buck8 and LDO35"), what results
> in reading the proper BUCK8 value and forcing it to 1500mV on boot. This
> is not enough for proper board operation and results in eMMC errors during
> heavy IO traffic. Increasing maximum voltage value for BUCK8 restores
> original driver behavior and fixes eMMC issues.
>
Their is a pincrtl setting to configure Read Strobe (RDQS) added to
support higher data rate
RDSQ --------XMMC0RDQS/GPC0_7/EXT_INT9_7
will setting this bit help resolve the eMMC error
Also we could increase the following
samsung,read-strobe-delay = <150>;
To increase stability of the eMMC.
Best Regards
-Anand
