On 28 June 2017 at 17:23, Wolfram Sang <wsa+rene...@sang-engineering.com> 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+rene...@sang-engineering.com>
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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