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drm: atmel-hlcdc: Add PM suspend/resume support

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On suspend: switch off CRTC if not already suspended with runtime PM

On resume: switch on CRTC if we were not already suspended from runtime
PM while suspending.

Signed-off-by: Sylvain Rochet <sylvain.rochet@finsecur.com>
Reviewed-by: Andrzej Hajda <a.hajda@samsung.com>
Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
This commit is contained in:
Sylvain Rochet 2015-02-22 18:51:03 +01:00 committed by Boris Brezillon
parent 5957017db0
commit 5848698258
1 changed files with 47 additions and 0 deletions
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47
drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
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@ -561,6 +561,52 @@ static int atmel_hlcdc_dc_drm_remove(struct platform_device *pdev)
return 0;
}
#ifdef CONFIG_PM
static int atmel_hlcdc_dc_drm_suspend(struct device *dev)
{
struct drm_device *drm_dev = dev_get_drvdata(dev);
struct drm_crtc *crtc;
if (pm_runtime_suspended(dev))
return 0;
drm_modeset_lock_all(drm_dev);
list_for_each_entry(crtc, &drm_dev->mode_config.crtc_list, head) {
struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
if (crtc->enabled) {
crtc_funcs->disable(crtc);
/* save enable state for resume */
crtc->enabled = true;
}
}
drm_modeset_unlock_all(drm_dev);
return 0;
}
static int atmel_hlcdc_dc_drm_resume(struct device *dev)
{
struct drm_device *drm_dev = dev_get_drvdata(dev);
struct drm_crtc *crtc;
if (pm_runtime_suspended(dev))
return 0;
drm_modeset_lock_all(drm_dev);
list_for_each_entry(crtc, &drm_dev->mode_config.crtc_list, head) {
struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
if (crtc->enabled) {
crtc->enabled = false;
crtc_funcs->enable(crtc);
}
}
drm_modeset_unlock_all(drm_dev);
return 0;
}
#endif
static SIMPLE_DEV_PM_OPS(atmel_hlcdc_dc_drm_pm_ops,
atmel_hlcdc_dc_drm_suspend, atmel_hlcdc_dc_drm_resume);
static const struct of_device_id atmel_hlcdc_dc_of_match[] = {
{ .compatible = "atmel,hlcdc-display-controller" },
{ },
@ -571,6 +617,7 @@ static struct platform_driver atmel_hlcdc_dc_platform_driver = {
.remove = atmel_hlcdc_dc_drm_remove,
.driver = {
.name = "atmel-hlcdc-display-controller",
.pm = &atmel_hlcdc_dc_drm_pm_ops,
.of_match_table = atmel_hlcdc_dc_of_match,
},
};