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authorTomasz Figa <tomasz.figa@gmail.com>2014-01-11 22:39:06 +0100
committerChris Ball <chris@printf.net>2014-03-03 16:23:39 +0100
commit2200300060ada5e32136d597502e446ac2ef2a27 (patch)
tree31bef47f87192c6a2df62bc4d36ce03771d57687 /drivers/mmc/host/sdhci-s3c.c
parentmmc: sdhci-s3c: Fix handling of bus clock switching (diff)
downloadlinux-2200300060ada5e32136d597502e446ac2ef2a27.tar.xz
linux-2200300060ada5e32136d597502e446ac2ef2a27.zip
mmc: sdhci-s3c: Do not allow frequencies higher than requested
This patch modifies sdhci_s3c_consider_clock() to fail if bus clock being considered can not provide frequency lower or equal requested, instead of returning the lowest supported. 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>
Diffstat (limited to 'drivers/mmc/host/sdhci-s3c.c')
-rw-r--r--drivers/mmc/host/sdhci-s3c.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/mmc/host/sdhci-s3c.c b/drivers/mmc/host/sdhci-s3c.c
index bad0e00a3e8f..d61eb5a70833 100644
--- a/drivers/mmc/host/sdhci-s3c.c
+++ b/drivers/mmc/host/sdhci-s3c.c
@@ -126,11 +126,18 @@ static unsigned int sdhci_s3c_consider_clock(struct sdhci_s3c *ourhost,
rate = ourhost->clk_rates[src];
- for (shift = 0; shift < 8; ++shift) {
+ for (shift = 0; shift <= 8; ++shift) {
if ((rate >> shift) <= wanted)
break;
}
+ if (shift > 8) {
+ dev_dbg(&ourhost->pdev->dev,
+ "clk %d: rate %ld, min rate %lu > wanted %u\n",
+ src, rate, rate / 256, wanted);
+ return UINT_MAX;
+ }
+
dev_dbg(&ourhost->pdev->dev, "clk %d: rate %ld, want %d, got %ld\n",
src, rate, wanted, rate >> shift);