Re: [PATCH 04/11] mmc: sunxi: Keep default timing phase settings for new timing mode

Re: [PATCH 04/11] mmc: sunxi: Keep default timing phase settings for new timing mode

[Ulf Hansson]

+stable

On 14 July 2017 at 08:42, Chen-Yu Tsai <wens@csie.org> wrote:
> The register for the "new timing mode" also has bit fields for setting
> output and sample timing phases. According to comments in Allwinner's
> BSP kernel, the default values are good enough.
>
> Keep the default values already in the hardware when setting new timing
> mode, instead of overwriting the whole register.
>
> Fixes: 9a37e53e451e ("mmc: sunxi: Enable the new timings for the A64 MMC
>                       controllers")
> Signed-off-by: Chen-Yu Tsai <wens@csie.org>

Thanks, applied for fixes and added a stable tag.

Kind regards
Uffe

> ---
>  drivers/mmc/host/sunxi-mmc.c | 8 ++++++--
>  1 file changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c
> index d6fa2214aaae..0fb4e4c119e1 100644
> --- a/drivers/mmc/host/sunxi-mmc.c
> +++ b/drivers/mmc/host/sunxi-mmc.c
> @@ -793,8 +793,12 @@ static int sunxi_mmc_clk_set_rate(struct sunxi_mmc_host *host,
>         }
>         mmc_writel(host, REG_CLKCR, rval);
>
> -       if (host->cfg->needs_new_timings)
> -               mmc_writel(host, REG_SD_NTSR, SDXC_2X_TIMING_MODE);
> +       if (host->cfg->needs_new_timings) {
> +               /* Don't touch the delay bits */
> +               rval = mmc_readl(host, REG_SD_NTSR);
> +               rval |= SDXC_2X_TIMING_MODE;
> +               mmc_writel(host, REG_SD_NTSR, rval);
> +       }
>
>         ret = sunxi_mmc_clk_set_phase(host, ios, rate);
>         if (ret)
> --
> 2.13.2
>