mmc: sdhci: switch from programmable clock mode to divided one if needed

In programmable mode, if the clock frequency is too high, the divider
can be too small to meet the clock frequency requirement especially to
init the SD card. In this case, switch to the divided clock mode.
Signed-off-by: NLudovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: NUlf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/sdhci.c

@@ -1151,6 +1151,7 @@ void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
 	int real_div = div, clk_mul = 1;
 	u16 clk = 0;
 	unsigned long timeout;
+	bool switch_base_clk = false;
 
 	host->mmc->actual_clock = 0;
 
@@ -1188,15 +1189,25 @@ void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
 					<= clock)
 					break;
 			}
-			/*
-			 * Set Programmable Clock Mode in the Clock
-			 * Control register.
-			 */
-			clk = SDHCI_PROG_CLOCK_MODE;
-			real_div = div;
-			clk_mul = host->clk_mul;
-			div--;
-		} else {
+			if ((host->max_clk * host->clk_mul / div) <= clock) {
+				/*
+				 * Set Programmable Clock Mode in the Clock
+				 * Control register.
+				 */
+				clk = SDHCI_PROG_CLOCK_MODE;
+				real_div = div;
+				clk_mul = host->clk_mul;
+				div--;
+			} else {
+				/*
+				 * Divisor can be too small to reach clock
+				 * speed requirement. Then use the base clock.
+				 */
+				switch_base_clk = true;
+			}
+		}
+
+		if (!host->clk_mul || switch_base_clk) {
 			/* Version 3.00 divisors must be a multiple of 2. */
 			if (host->max_clk <= clock)
 				div = 1;