[PATCH 2/2] mmc: sdhci-esdhc-imx: Add HS400 support for iMX7ULP

[Oleksandr Suvorov]

On Tue, Aug 31, 2021 at 8:34 PM Fabio Estevam <festevam at gmail.com> wrote:
>
> Hi Oleksandr,
>
> On Tue, Aug 31, 2021 at 1:42 PM Oleksandr Suvorov
> <oleksandr.suvorov at foundries.io> wrote:
> >
> > Import HS400 support for iMX7ULP B0 from the Linux kernel:
> >
> > 2eaf5a533afd ("mmc: sdhci-esdhc-imx: Add HS400 support for iMX7ULP")
> >
> > According to IC suggest, need to clear the STROBE_DLL_CTRL_RESET
> > before any setting of STROBE_DLL_CTRL register.
> >
> > USDHC has register bits(bit[27~20] of register STROBE_DLL_CTRL)
> > for slave sel value. If this register bits value is 0,  it needs
> > 256 ref_clk cycles to update slave sel value. IC suggest to set
> > bit[27~20] to 0x4, it only need 4 ref_clk cycle to update slave
> > sel value. This will short the lock time of slave.
> >
> > i.MX7ULP B0 will need more time to lock the REF and SLV, so change
> > to add 5us delay.
> >
> > Signed-off-by: Oleksandr Suvorov <oleksandr.suvorov at foundries.io>
> > Series-notes
> > fsl_esdhc_imx improvements
> >
> > Import individual settings for soc imx7ulp and add support of HS400 for
> > this soc.
> > END
>
> The text below the Signed-off-by should be removed.

Oops, missed ":" :) The fix is coming.

>
> Other than that, the patch looks good:
>
> Reviewed-by: Fabio Estevam <festevam at gmail.com>

Thanks, Fabio!


-- 
Best regards
Oleksandr

Oleksandr Suvorov
cryosay at gmail.com