From: Kevin Liu <kliu5@xxxxxxxxxxx>
With preset value enabled, there are two continuous times
of sd clock disable/enable. They can be combined into one
to save time and make code cleaner.
Signed-off-by: Kevin Liu <kliu5@xxxxxxxxxxx>
---
drivers/mmc/host/sdhci.c | 29 +++++++++--------------------
1 files changed, 9 insertions(+), 20 deletions(-)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 94dab9c..eb621dd 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1449,33 +1449,22 @@ static void sdhci_do_set_ios(struct sdhci_host *host, struct mmc_ios *ios)
ctrl_2 |= SDHCI_CTRL_DRV_TYPE_C;
sdhci_writew(host, ctrl_2, SDHCI_HOST_CONTROL2);
- } else {
- /*
- * According to SDHC Spec v3.00, if the Preset Value
- * Enable in the Host Control 2 register is set, we
- * need to reset SD Clock Enable before changing High
- * Speed Enable to avoid generating clock gliches.
- */
-
- /* Reset SD Clock Enable */
- clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
- clk &= ~SDHCI_CLOCK_CARD_EN;
- sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
-
- sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
-
- /* Re-enable SD Clock */
- clock = host->clock;
- host->clock = 0;
- sdhci_set_clock(host, clock);
}
-
/* Reset SD Clock Enable */
clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
clk &= ~SDHCI_CLOCK_CARD_EN;
sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);
+ /*
+ * According to SDHC Spec v3.00, if the Preset Value
+ * Enable in the Host Control 2 register is set, we
+ * need to reset SD Clock Enable before changing High
+ * Speed Enable to avoid generating clock gliches.
+ */
+ if (ctrl_2 & SDHCI_CTRL_PRESET_VAL_ENABLE)
+ sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
+
if (host->ops->set_uhs_signaling)
host->ops->set_uhs_signaling(host, ios->timing);
else {
--
1.7.0.4
--
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