[media] exynos4-is: Fix FIMC-IS clocks initialization

The ISP clock register content is not preserved over the ISP power domain
off/on cycle. Instead of setting the clock frequencies once at probe time
the clock rates set up is moved to the runtime_resume handler, which is
invoked after the related power domain is already enabled, ensuring the
clocks are properly configured when the device is actively used.
This fixes the FIMC-IS malfunctions and STREAM ON timeout errors accuring
on some boards:
[ 59.860000] fimc_is_general_irq_handler:583 ISR_NDONE: 5: 0x800003e8, IS_ERROR_UNKNOWN
[ 59.860000] fimc_is_general_irq_handler:586 IS_ERROR_TIME_OUT

Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

diff --git a/drivers/media/platform/exynos4-is/fimc-is.c b/drivers/media/platform/exynos4-is/fimc-is.c
index 520e4398b69c32fae87b8597fc455a7695e7fc05..0741945b79ed08829d0fe7490771a9f725f6063c 100644 (file)
--- a/drivers/media/platform/exynos4-is/fimc-is.c
+++ b/drivers/media/platform/exynos4-is/fimc-is.c
@@ -834,23 +834,11 @@ static int fimc_is_probe(struct platform_device *pdev)
                goto err_clk;
        }
        pm_runtime_enable(dev);
-       /*
-        * Enable only the ISP power domain, keep FIMC-IS clocks off until
-        * the whole clock tree is configured. The ISP power domain needs
-        * be active in order to acces any CMU_ISP clock registers.
-        */
-       ret = pm_runtime_get_sync(dev);
-       if (ret < 0)
-               goto err_irq;
-
-       ret = fimc_is_setup_clocks(is);
-       pm_runtime_put_sync(dev);
 
+       ret = pm_runtime_get_sync(dev);
        if (ret < 0)
                goto err_irq;
 
-       is->clk_init = true;
-
        is->alloc_ctx = vb2_dma_contig_init_ctx(dev);
        if (IS_ERR(is->alloc_ctx)) {
                ret = PTR_ERR(is->alloc_ctx);
@@ -872,6 +860,8 @@ static int fimc_is_probe(struct platform_device *pdev)
        if (ret < 0)
                goto err_dfs;
 
+       pm_runtime_put_sync(dev);
+
        dev_dbg(dev, "FIMC-IS registered successfully\n");
        return 0;
 
@@ -891,9 +881,11 @@ err_clk:
 static int fimc_is_runtime_resume(struct device *dev)
 {
        struct fimc_is *is = dev_get_drvdata(dev);
+       int ret;
 
-       if (!is->clk_init)
-               return 0;
+       ret = fimc_is_setup_clocks(is);
+       if (ret)
+               return ret;
 
        return fimc_is_enable_clocks(is);
 }
@@ -902,9 +894,7 @@ static int fimc_is_runtime_suspend(struct device *dev)
 {
        struct fimc_is *is = dev_get_drvdata(dev);
 
-       if (is->clk_init)
-               fimc_is_disable_clocks(is);
-
+       fimc_is_disable_clocks(is);
        return 0;
 }
 

diff --git a/drivers/media/platform/exynos4-is/fimc-is.h b/drivers/media/platform/exynos4-is/fimc-is.h
index 606a7c9fe526a821f9e44b19863846cafe285a7e..d7db133b493f7068e9f5281af8a2c95b9c21bf50 100644 (file)
--- a/drivers/media/platform/exynos4-is/fimc-is.h
+++ b/drivers/media/platform/exynos4-is/fimc-is.h
@@ -264,7 +264,6 @@ struct fimc_is {
        spinlock_t                      slock;
 
        struct clk                      *clocks[ISS_CLKS_MAX];
-       bool                            clk_init;
        void __iomem                    *regs;
        void __iomem                    *pmu_regs;
        int                             irq;