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drm: rcar-du: Implement system suspend/resume support 

To support system suspend operations we must ensure the hardware is
stopped, and resumed explicitly from the suspend and resume handlers.

Implement suspend and resume functions using the DRM atomic helper
functions.

Signed-off-by: Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
This commit is contained in:
Kieran Bingham 2017-09-15 17:42:06 +01:00 committed by Laurent Pinchart
parent e2f930aaa3
commit 7912dee777
2 changed files with 16 additions and 3 deletions
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18
drivers/gpu/drm/rcar-du/rcar_du_drv.c
View File

@ -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>
@ -309,9 +310,19 @@ 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;
}
@ -320,9 +331,10 @@ 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

1
drivers/gpu/drm/rcar-du/rcar_du_drv.h
View File

@ -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;