[PATCH 3.16 146/148] mmc: sdhci-s3c: Check if clk_set_rate() succeeds

Ben Hutchings
2020-02-08T18:30:33Z

From: Mark Brown <broonie@linaro.org>

commit cd0cfdd2485e6252b3c69284bf09d06c4d303116 upstream.

It is possible that we may fail to set the clock rate, if we do so then
log the failure and don't bother reprogramming the IP.

Signed-off-by: Mark Brown <broonie@linaro.org>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/mmc/host/sdhci-s3c.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)

--- a/drivers/mmc/host/sdhci-s3c.c
+++ b/drivers/mmc/host/sdhci-s3c.c
@@ -300,6 +300,7 @@ static void sdhci_cmu_set_clock(struct s
struct device *dev = &ourhost->pdev->dev;
unsigned long timeout;
u16 clk = 0;
+ int ret;

host->mmc->actual_clock = 0;

@@ -311,7 +312,12 @@ static void sdhci_cmu_set_clock(struct s

sdhci_s3c_set_clock(host, clock);

- clk_set_rate(ourhost->clk_bus[ourhost->cur_clk], clock);
+ ret = clk_set_rate(ourhost->clk_bus[ourhost->cur_clk], clock);
+ if (ret != 0) {
+ dev_err(dev, "%s: failed to set clock rate %uHz\n",
+ mmc_hostname(host->mmc), clock);
+ return;
+ }

clk = SDHCI_CLOCK_INT_EN;
sdhci_writew(host, clk, SDHCI_CLOCK_CONTROL);