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

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@sang-engineering.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/host/tmio_mmc_core.c b/drivers/mmc/host/tmio_mmc_core.c
index ad31bdf..12cf828 100644 (file)
--- 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,