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[media] exynos4-is: Improve clock management 

There is no need to keep all clocks prepared all the time. Call to
clk_prepare/unprepare can be done on demand from runtime pm callbacks
(it is allowed to call sleeping functions from that context).

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Acked-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Marek Szyprowski 2016-08-31 10:25:17 -03:00 committed by Mauro Carvalho Chehab
parent 438236e7c1
commit 5f6d636f91
1 changed files with 4 additions and 12 deletions
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16
drivers/media/platform/exynos4-is/fimc-lite.c
View File

@ -1454,25 +1454,17 @@ static void fimc_lite_clk_put(struct fimc_lite *fimc)
if (IS_ERR(fimc->clock))
return;
clk_unprepare(fimc->clock);
clk_put(fimc->clock);
fimc->clock = ERR_PTR(-EINVAL);
}
static int fimc_lite_clk_get(struct fimc_lite *fimc)
{
int ret;
fimc->clock = clk_get(&fimc->pdev->dev, FLITE_CLK_NAME);
if (IS_ERR(fimc->clock))
return PTR_ERR(fimc->clock);
ret = clk_prepare(fimc->clock);
if (ret < 0) {
clk_put(fimc->clock);
fimc->clock = ERR_PTR(-EINVAL);
}
return ret;
return 0;
}
static const struct of_device_id flite_of_match[];
@ -1543,7 +1535,7 @@ static int fimc_lite_probe(struct platform_device *pdev)
pm_runtime_enable(dev);
if (!pm_runtime_enabled(dev)) {
ret = clk_enable(fimc->clock);
ret = clk_prepare_enable(fimc->clock);
if (ret < 0)
goto err_sd;
}
@ -1568,7 +1560,7 @@ static int fimc_lite_runtime_resume(struct device *dev)
{
struct fimc_lite *fimc = dev_get_drvdata(dev);
clk_enable(fimc->clock);
clk_prepare_enable(fimc->clock);
return 0;
}
@ -1576,7 +1568,7 @@ static int fimc_lite_runtime_suspend(struct device *dev)
{
struct fimc_lite *fimc = dev_get_drvdata(dev);
clk_disable(fimc->clock);
clk_disable_unprepare(fimc->clock);
return 0;
}
#endif