SDHCI has separate controls for the internal clock and enabling the
clock signal to the card.
The card clock signal was disabled via SDHCI_CLOCK_CARD_EN to avoid
glitches on the clock line. It is not necessary to reset the internal clock
to re-enable it. Instead re-enable by re-asserting SDHCI_CLOCK_CARD_EN.
Tested-by: Haibo Chen <haibo.chen@xxxxxxx>
Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
---
drivers/mmc/host/sdhci.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index beb1fe643634..9a245d5c532b 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2452,8 +2452,11 @@ void sdhci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios)
host->drv_type = ios->drv_type;
}
- /* Re-enable SD Clock */
- host->ops->set_clock(host, host->clock);
+ if (ios->clock) {
+ clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
+ clk |= SDHCI_CLOCK_CARD_EN;
+ sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
+ }
} else
sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
}
--
2.34.1
