Hi Shawn,
On 07/25/2014 08:20 AM, Shawn Guo wrote:
> HDMI currently stops working after a system suspend/resume cycle. The
> cause is that the mode setting states in hardware gets lost and isn't
> restored across the suspend/resume cycle.
>
> The patch adds a very basic suspend/resume support to imx-drm driver,
> and calls drm_helper_resume_force_mode() in .resume hook to restore the
> mode setting states, so that HDMI can continue working after a system
> suspend/resume cycle.
>
> Signed-off-by: Shawn Guo <shawn.guo@xxxxxxxxxxxxx>
> ---
> Changs since v1:
> - Do not walk through connector->funcs->dpms() but only call
> drm_helper_resume_force_mode() in .resume.
>
> drivers/staging/imx-drm/imx-drm-core.c | 24 ++++++++++++++++++++++++
> 1 file changed, 24 insertions(+)
>
> diff --git a/drivers/staging/imx-drm/imx-drm-core.c b/drivers/staging/imx-drm/imx-drm-core.c
> index def8280d7ee6..ab41152089a3 100644
> --- a/drivers/staging/imx-drm/imx-drm-core.c
> +++ b/drivers/staging/imx-drm/imx-drm-core.c
> @@ -696,6 +696,29 @@ static int imx_drm_platform_remove(struct platform_device *pdev)
> return 0;
> }
>
> +#ifdef CONFIG_PM_SLEEP
> +static int imx_drm_suspend(struct device *dev)
> +{
> + struct drm_device *drm_dev = dev_get_drvdata(dev);
> +
> + drm_kms_helper_poll_disable(drm_dev);
drm_dev can be NULL here. You should add check before.
> +
> + return 0;
> +}
> +
> +static int imx_drm_resume(struct device *dev)
> +{
> + struct drm_device *drm_dev = dev_get_drvdata(dev);
> +
> + drm_helper_resume_force_mode(drm_dev);
ditto
Regards
Andrzej
> + drm_kms_helper_poll_enable(drm_dev);
> +
> + return 0;
> +}
> +#endif
> +
> +static SIMPLE_DEV_PM_OPS(imx_drm_pm_ops, imx_drm_suspend, imx_drm_resume);
> +
> static const struct of_device_id imx_drm_dt_ids[] = {
> { .compatible = "fsl,imx-display-subsystem", },
> { /* sentinel */ },
> @@ -708,6 +731,7 @@ static struct platform_driver imx_drm_pdrv = {
> .driver = {
> .owner = THIS_MODULE,
> .name = "imx-drm",
> + .pm = &imx_drm_pm_ops,
> .of_match_table = imx_drm_dt_ids,
> },
> };
>
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