mmc: sdhci-s3c: Cache bus clock rates

To fix scheduling while atomic happening in sdhci_s3c_set_clock() caused
by calling clk_get_rate() that might sleep, this patch modifies the
driver to cache rates of all bus clocks at probe time and then only use
those cache values.

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Acked-by: Heiko Stuebner <heiko@sntech.de>
Tested-by: Jaehoon Chung <jh80.chung@samsung.com>
Acked-by; Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Chris Ball <chris@printf.net>

1 files changed, 6 insertions, 3 deletions

diff --git a/drivers/mmc/host/sdhci-s3c.c b/drivers/mmc/host/sdhci-s3c.c
index 52770d58cc47..9b783915b02a 100644
--- a/drivers/mmc/host/sdhci-s3c.c
+++ b/drivers/mmc/host/sdhci-s3c.c
@@ -57,6 +57,7 @@ struct sdhci_s3c {
 
         struct clk              *clk_io;
         struct clk              *clk_bus[MAX_BUS_CLK];
+        unsigned long           clk_rates[MAX_BUS_CLK];
 };
 
 /**
@@ -158,7 +159,7 @@ static unsigned int sdhci_s3c_consider_clock(struct sdhci_s3c *ourhost,
                 return wanted - rate;
         }
 
-        rate = clk_get_rate(clksrc);
+        rate = ourhost->clk_rates[src];
 
         for (shift = 0; shift < 8; ++shift) {
                 if ((rate >> shift) <= wanted)
@@ -215,7 +216,7 @@ static void sdhci_s3c_set_clock(struct sdhci_host *host, unsigned int clock)
                 writew(0, host->ioaddr + SDHCI_CLOCK_CONTROL);
 
                 ourhost->cur_clk = best_src;
-                host->max_clk = clk_get_rate(clk);
+                host->max_clk = ourhost->clk_rates[best_src];
 
                 ctrl = readl(host->ioaddr + S3C_SDHCI_CONTROL2);
                 ctrl &= ~S3C_SDHCI_CTRL2_SELBASECLK_MASK;
@@ -583,8 +584,10 @@ static int sdhci_s3c_probe(struct platform_device *pdev)
                  */
                 sc->cur_clk = ptr;
 
+                sc->clk_rates[ptr] = clk_get_rate(sc->clk_bus[ptr]);
+
                 dev_info(dev, "clock source %d: %s (%ld Hz)\n",
-                         ptr, name, clk_get_rate(clk));
+                                ptr, name, sc->clk_rates[ptr]);
         }
 
         if (clks == 0) {