From: Darren Etheridge detheridge@ti.com
On resume the screen contents were not being restored properly. Looking at other DRM drivers it seems a call to drm_helper_resume_force_mode() is needed in the resume handler to force restoration of the mode and framebuffer data.
Signed-off-by: Darren Etheridge detheridge@ti.com --- drivers/gpu/drm/tilcdc/tilcdc_drv.c | 7 +++++++ 1 file changed, 7 insertions(+)
diff --git a/drivers/gpu/drm/tilcdc/tilcdc_drv.c b/drivers/gpu/drm/tilcdc/tilcdc_drv.c index 171a820..1a5ddfa 100644 --- a/drivers/gpu/drm/tilcdc/tilcdc_drv.c +++ b/drivers/gpu/drm/tilcdc/tilcdc_drv.c @@ -563,6 +563,13 @@ static int tilcdc_pm_resume(struct device *dev) if (registers[i].save && (priv->rev >= registers[i].rev)) tilcdc_write(ddev, registers[i].reg, priv->saved_register[n++]);
+ /* + * if this call isn't here, the display is blank on return from + * suspend. With this call here the contents of the framebuffer + * during suspend are restored correctly. + */ + drm_helper_resume_force_mode(ddev); + drm_kms_helper_poll_enable(ddev);
return 0;