[media] exynos4-is: Handle suspend/resume of fimc-is-i2c correctly

If the same callbacks are used for runtime and system suspend/resume,
clocks can get disabled twice, which can lead to negative reference
counts and kernel warnings.
This patch splits suspend/resume callbacks into separate runtime and
system-wide functions, so clock gating is done correctly.

Signed-off-by: Tomasz Figa <t.figa@samsung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>

1 files changed, 29 insertions, 4 deletions

diff --git a/drivers/media/platform/exynos4-is/fimc-is-i2c.c b/drivers/media/platform/exynos4-is/fimc-is-i2c.c
index 617a798d9235..6bc481a9e93f 100644
--- a/drivers/media/platform/exynos4-is/fimc-is-i2c.c
+++ b/drivers/media/platform/exynos4-is/fimc-is-i2c.c
@@ -83,21 +83,46 @@ static int fimc_is_i2c_remove(struct platform_device *pdev)
         return 0;
 }
 
-static int fimc_is_i2c_suspend(struct device *dev)
+#if defined(CONFIG_PM_RUNTIME) || defined(CONFIG_PM_SLEEP)
+static int fimc_is_i2c_runtime_suspend(struct device *dev)
 {
         struct fimc_is_i2c *isp_i2c = dev_get_drvdata(dev);
+
         clk_disable_unprepare(isp_i2c->clock);
         return 0;
 }
 
-static int fimc_is_i2c_resume(struct device *dev)
+static int fimc_is_i2c_runtime_resume(struct device *dev)
 {
         struct fimc_is_i2c *isp_i2c = dev_get_drvdata(dev);
+
         return clk_prepare_enable(isp_i2c->clock);
 }
+#endif
 
-static UNIVERSAL_DEV_PM_OPS(fimc_is_i2c_pm_ops, fimc_is_i2c_suspend,
-                     fimc_is_i2c_resume, NULL);
+#ifdef CONFIG_PM_SLEEP
+static int fimc_is_i2c_suspend(struct device *dev)
+{
+        if (pm_runtime_suspended(dev))
+                return 0;
+
+        return fimc_is_i2c_runtime_suspend(dev);
+}
+
+static int fimc_is_i2c_resume(struct device *dev)
+{
+        if (pm_runtime_suspended(dev))
+                return 0;
+
+        return fimc_is_i2c_runtime_resume(dev);
+}
+#endif
+
+static struct dev_pm_ops fimc_is_i2c_pm_ops = {
+        SET_RUNTIME_PM_OPS(fimc_is_i2c_runtime_suspend,
+                                        fimc_is_i2c_runtime_resume, NULL)
+        SET_SYSTEM_SLEEP_PM_OPS(fimc_is_i2c_suspend, fimc_is_i2c_resume)
+};
 
 static const struct of_device_id fimc_is_i2c_of_match[] = {
         { .compatible = FIMC_IS_I2C_COMPATIBLE },