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Commit 58486982 authored by Sylvain Rochet's avatar Sylvain Rochet Committed by Boris Brezillon
Browse files

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



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: default avatarSylvain Rochet <sylvain.rochet@finsecur.com>
Reviewed-by: default avatarAndrzej Hajda <a.hajda@samsung.com>
Signed-off-by: default avatarBoris Brezillon <boris.brezillon@free-electrons.com>
parent 5957017d

drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c

+47 −0
Original line number Diff line number Diff line
@@ -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,

	},

};