[PATCH] mmc: sdhci: programmable clock calculation needs multiplier +1

[curtis.machida at intel.com]

From: cmachida <curtis.machida at intel.com>

According to the SD Host Controller Simplified Specification v4.20,
the multiplier value M is one more than the Clock Multiplier field.

Copied code from Linux project.  drivers/mmc/host/sdhci.c line 4405

Signed-off-by: cmachida <curtis.machida at intel.com>
---

 drivers/mmc/sdhci.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/mmc/sdhci.c b/drivers/mmc/sdhci.c
index 0178ed8a11..a8476ec4e9 100644
--- a/drivers/mmc/sdhci.c
+++ b/drivers/mmc/sdhci.c
@@ -929,6 +929,15 @@ int sdhci_setup_cfg(struct mmc_config *cfg, struct sdhci_host *host,
 		debug("%s, caps_1: 0x%x\n", __func__, caps_1);
 		host->clk_mul = (caps_1 & SDHCI_CLOCK_MUL_MASK) >>
 				SDHCI_CLOCK_MUL_SHIFT;
+
+		/*
+		 * In case the value in Clock Multiplier is 0, then programmable
+		 * clock mode is not supported, otherwise the actual clock
+		 * multiplier is one more than the value of Clock Multiplier
+		 * in the Capabilities Register.
+		 */
+		if (host->clk_mul)
+			host->clk_mul += 1;
 	}
 
 	if (host->max_clk == 0) {
-- 
2.43.2