On 02/22/2015 06:51 PM, Sylvain Rochet wrote:
> 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 at finsecur.com>
Reviewed-by: Andrzej Hajda <a.hajda at samsung.com>
Regards
Andrzej
> ---
> drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c | 47
> ++++++++++++++++++++++++++++
> 1 file changed, 47 insertions(+)
>
> diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
> b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
> index 22c3cca..c4bb1f9 100644
> --- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
> +++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_dc.c
> @@ -559,6 +559,52 @@ 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" },
> { },
> @@ -569,6 +615,7 @@ 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,
> },
> };
>
