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>
---
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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