The DLL clock has to be enabled until the correct
clock frequency is delivered to DLL
'1'(default) - DLL clock is disabled
'0' - dll clock has legacly clock enable.
Signed-off-by: Varadarajan Narayanan <varada@xxxxxxxxxxxxxx>
Signed-off-by: Sreedhar Sambangi <ssambang@xxxxxxxxxxxxxx>
---
drivers/mmc/host/sdhci-msm.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
index 4695bee..95b8b70 100644
--- a/drivers/mmc/host/sdhci-msm.c
+++ b/drivers/mmc/host/sdhci-msm.c
@@ -43,6 +43,9 @@
#define CORE_DLL_CONFIG 0x100
#define CORE_DLL_STATUS 0x108
+#define CORE_DLL_CONFIG2 0x1b4
+#define CORE_DLL_CLK_DISABLE BIT(21)
+
#define CORE_VENDOR_SPEC 0x10c
#define CORE_CLK_PWRSAVE BIT(1)
@@ -326,6 +329,10 @@ static int msm_init_cm_dll(struct sdhci_host *host)
writel_relaxed((readl_relaxed(host->ioaddr + CORE_DLL_CONFIG)
| CORE_CK_OUT_EN), host->ioaddr + CORE_DLL_CONFIG);
+ /* Write 0 to DLL_CLOCK_DISABLE bit of DLL_CONFIG_2 register */
+ writel_relaxed((readl_relaxed(host->ioaddr + CORE_DLL_CONFIG2)
+ & ~CORE_DLL_CLK_DISABLE), host->ioaddr + CORE_DLL_CONFIG2);
+
/* Wait until DLL_LOCK bit of DLL_STATUS register becomes '1' */
while (!(readl_relaxed(host->ioaddr + CORE_DLL_STATUS) &
CORE_DLL_LOCK)) {
--
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a Linux Foundation Collaborative Project
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