Re: [PATCH] mmc: tmio: don't wait on R-Car2+ when handling the clock

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On 28 June 2017 at 17:23, Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx> wrote:
> Our hardware engineers confirmed that it is unnecessary to wait when
> turning the clock on/off. The documentation was a tad vague, so we
> used to play safe.
>
> Signed-off-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>

Thanks, applied for next!

Kind regards
Uffe

> ---
>
> Tested on H2 and M3-W. Based on top of mmc/next with Simon's Gen3 DMA patches.
>
>  drivers/mmc/host/tmio_mmc_core.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mmc/host/tmio_mmc_core.c b/drivers/mmc/host/tmio_mmc_core.c
> index 77e7b56a909933..1851c883bfc82a 100644
> --- a/drivers/mmc/host/tmio_mmc_core.c
> +++ b/drivers/mmc/host/tmio_mmc_core.c
> @@ -207,7 +207,10 @@ static void tmio_mmc_clk_start(struct tmio_mmc_host *host)
>  {
>         sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, CLK_CTL_SCLKEN |
>                 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
> -       msleep(host->pdata->flags & TMIO_MMC_MIN_RCAR2 ? 1 : 10);
> +
> +       /* HW engineers overrode docs: no sleep needed on R-Car2+ */
> +       if (!(host->pdata->flags & TMIO_MMC_MIN_RCAR2))
> +               msleep(10);
>
>         if (host->pdata->flags & TMIO_MMC_HAVE_HIGH_REG) {
>                 sd_ctrl_write16(host, CTL_CLK_AND_WAIT_CTL, 0x0100);
> @@ -224,7 +227,10 @@ static void tmio_mmc_clk_stop(struct tmio_mmc_host *host)
>
>         sd_ctrl_write16(host, CTL_SD_CARD_CLK_CTL, ~CLK_CTL_SCLKEN &
>                 sd_ctrl_read16(host, CTL_SD_CARD_CLK_CTL));
> -       msleep(host->pdata->flags & TMIO_MMC_MIN_RCAR2 ? 5 : 10);
> +
> +       /* HW engineers overrode docs: no sleep needed on R-Car2+ */
> +       if (!(host->pdata->flags & TMIO_MMC_MIN_RCAR2))
> +               msleep(10);
>  }
>
>  static void tmio_mmc_set_clock(struct tmio_mmc_host *host,
> --
> 2.11.0
>
> --
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