MLK-20181-6: drm/mxsfb: Add PM_SLEEP support

Since power to the lcdif block can be lost on suspend implement
PM_SLEEP_OPS using drm_mode_config_helper_suspend/resume to save/restore
the current mode.

Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
Reviewed-by: Stefan Agner <stefan@agner.ch>
Reviewed-by: Sean Paul <seanpaul@chromium.org>
Signed-off-by: Stefan Agner <stefan@agner.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/cfa1a4083eefd112362e640deeb2e120584ac3f5.1537191359.git.leonard.crestez@nxp.com

diff --git a/drivers/gpu/drm/mxsfb/mxsfb_drv.c b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
index 6c22d5f..2d68597 100644 (file)
--- a/drivers/gpu/drm/mxsfb/mxsfb_drv.c
+++ b/drivers/gpu/drm/mxsfb/mxsfb_drv.c
@@ -542,67 +542,23 @@ static int mxsfb_remove(struct platform_device *pdev)
        return 0;
 }
 
-#ifdef CONFIG_PM
-static int mxsfb_runtime_suspend(struct device *dev)
-{
-       struct drm_device *drm = dev_get_drvdata(dev);
-       struct mxsfb_drm_private *mxsfb = drm->dev_private;
-
-       if (!drm->registered)
-               return 0;
-
-       if (mxsfb->enabled) {
-               mxsfb_crtc_disable(mxsfb);
-               mxsfb->suspended = true;
-       }
-
-       return 0;
-}
-
-static int mxsfb_runtime_resume(struct device *dev)
-{
-       struct drm_device *drm = dev_get_drvdata(dev);
-       struct mxsfb_drm_private *mxsfb = drm->dev_private;
-
-       if (!drm->registered || !mxsfb->suspended)
-               return 0;
-
-       mxsfb_crtc_enable(mxsfb);
-       mxsfb->suspended = false;
-
-       return 0;
-}
-
+#ifdef CONFIG_PM_SLEEP
 static int mxsfb_suspend(struct device *dev)
 {
        struct drm_device *drm = dev_get_drvdata(dev);
-       struct mxsfb_drm_private *mxsfb = drm->dev_private;
-
-       if (mxsfb->enabled) {
-               mxsfb_crtc_disable(mxsfb);
-               mxsfb->suspended = true;
-       }
 
-       return 0;
+       return drm_mode_config_helper_suspend(drm);
 }
 
 static int mxsfb_resume(struct device *dev)
 {
        struct drm_device *drm = dev_get_drvdata(dev);
-       struct mxsfb_drm_private *mxsfb = drm->dev_private;
-
-       if (!mxsfb->suspended)
-               return 0;
 
-       mxsfb_crtc_enable(mxsfb);
-       mxsfb->suspended = false;
-
-       return 0;
+       return drm_mode_config_helper_resume(drm);
 }
 #endif
 
 static const struct dev_pm_ops mxsfb_pm_ops = {
-       SET_RUNTIME_PM_OPS(mxsfb_runtime_suspend, mxsfb_runtime_resume, NULL)
        SET_SYSTEM_SLEEP_PM_OPS(mxsfb_suspend, mxsfb_resume)
 };
 
@@ -613,7 +569,7 @@ static struct platform_driver mxsfb_platform_driver = {
        .driver = {
                .name           = "mxsfb",
                .of_match_table = mxsfb_dt_ids,
-               .pm = &mxsfb_pm_ops,
+               .pm             = &mxsfb_pm_ops,
        },
 };