drm: rcar-du: Add suspend resume helpers
The pipeline needs to ensure that the hardware is idle for suspend and
resume operations.
Implement suspend and resume functions using the DRM atomic helper
functions.
CC: dri-devel@lists.freedesktop.org
Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.c b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
index d2f29e6..9a544b8 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_drv.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
@@ -22,6 +22,7 @@
#include <linux/wait.h>
#include <drm/drmP.h>
+#include <drm/drm_atomic_helper.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_fb_cma_helper.h>
#include <drm/drm_gem_cma_helper.h>
@@ -265,9 +266,19 @@ static struct drm_driver rcar_du_driver = {
static int rcar_du_pm_suspend(struct device *dev)
{
struct rcar_du_device *rcdu = dev_get_drvdata(dev);
+ struct drm_atomic_state *state;
drm_kms_helper_poll_disable(rcdu->ddev);
- /* TODO Suspend the CRTC */
+ drm_fbdev_cma_set_suspend_unlocked(rcdu->fbdev, true);
+
+ state = drm_atomic_helper_suspend(rcdu->ddev);
+ if (IS_ERR(state)) {
+ drm_fbdev_cma_set_suspend_unlocked(rcdu->fbdev, false);
+ drm_kms_helper_poll_enable(rcdu->ddev);
+ return PTR_ERR(state);
+ }
+
+ rcdu->suspend_state = state;
return 0;
}
@@ -276,9 +287,10 @@ static int rcar_du_pm_resume(struct device *dev)
{
struct rcar_du_device *rcdu = dev_get_drvdata(dev);
- /* TODO Resume the CRTC */
-
+ drm_atomic_helper_resume(rcdu->ddev, rcdu->suspend_state);
+ drm_fbdev_cma_set_suspend_unlocked(rcdu->fbdev, false);
drm_kms_helper_poll_enable(rcdu->ddev);
+
return 0;
}
#endif
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.h b/drivers/gpu/drm/rcar-du/rcar_du_drv.h
index f8cd794..f400fde 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_drv.h
+++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.h
@@ -81,6 +81,7 @@ struct rcar_du_device {
struct drm_device *ddev;
struct drm_fbdev_cma *fbdev;
+ struct drm_atomic_state *suspend_state;
struct rcar_du_crtc crtcs[RCAR_DU_MAX_CRTCS];
unsigned int num_crtcs;
