drm/exynos: dsi: add simple runtime pm support

Add simple runtime pm to let driver to control power domain. No runtime pm
callbacks are defined, because state of the driver is already handled by
the DRM core.

Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
[Add error routine for component_add like decon driver from probe]
Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>
Change-Id: I77cdcf9b669c2bee45c14ba8d86f7fd1bbf8ba9c

diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
index b1dd7ef..720bfed 100644 (file)
--- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
@@ -23,6 +23,7 @@
 #include <linux/of_graph.h>
 #include <linux/phy/phy.h>
 #include <linux/regulator/consumer.h>
+#include <linux/pm_runtime.h>
 #include <linux/component.h>
 
 #include <video/mipi_display.h>
@@ -1458,10 +1459,14 @@ static int exynos_dsi_poweron(struct exynos_dsi *dsi)
        struct exynos_dsi_driver_data *driver_data = dsi->driver_data;
        int ret, i;
 
+       ret = pm_runtime_get_sync(dsi->dev);
+       if (ret < 0)
+               return ret;
+
        ret = regulator_bulk_enable(ARRAY_SIZE(dsi->supplies), dsi->supplies);
        if (ret < 0) {
                dev_err(dsi->dev, "cannot enable regulators %d\n", ret);
-               return ret;
+               goto err_pm;
        }
 
        for (i = 0; i < driver_data->num_clks; i++) {
@@ -1482,6 +1487,8 @@ err_clk:
        while (--i > -1)
                clk_disable_unprepare(dsi->clks[i]);
        regulator_bulk_disable(ARRAY_SIZE(dsi->supplies), dsi->supplies);
+err_pm:
+       pm_runtime_put(dsi->dev);
 
        return ret;
 }
@@ -1511,6 +1518,7 @@ static void exynos_dsi_poweroff(struct exynos_dsi *dsi)
        ret = regulator_bulk_disable(ARRAY_SIZE(dsi->supplies), dsi->supplies);
        if (ret < 0)
                dev_err(dsi->dev, "cannot disable regulators %d\n", ret);
+       pm_runtime_put(dsi->dev);
 }
 
 static int exynos_dsi_enable(struct exynos_dsi *dsi)
@@ -1950,13 +1958,24 @@ static int exynos_dsi_probe(struct platform_device *pdev)
        }
 
        platform_set_drvdata(pdev, &dsi->display);
+       pm_runtime_enable(dev);
+
+       ret = component_add(dev, &exynos_dsi_component_ops);
+       if (ret)
+               goto err_pm;
+
+       return 0;
 
-       return component_add(dev, &exynos_dsi_component_ops);
+err_pm:
+       pm_runtime_disable(dev);
+
+       return ret;
 }
 
 static int exynos_dsi_remove(struct platform_device *pdev)
 {
        component_del(&pdev->dev, &exynos_dsi_component_ops);
+       pm_runtime_disable(&pdev->dev);
 
        return 0;
 }