[PATCH 5/5] drm/tegra: Add minimal power management

[Sean Paul]

On Fri, Dec 19, 2014 at 10:24 AM, Thierry Reding
<thierry.reding at gmail.com> wrote:
> From: Thierry Reding <treding at nvidia.com>
>
> For now only disable the KMS hotplug polling helper logic upon suspend
> and re-enable it on resume.
>
> Signed-off-by: Thierry Reding <treding at nvidia.com>

Reviewed-by: Sean Paul <seanpaul at chromium.org>

> ---
>  drivers/gpu/drm/tegra/drm.c | 25 +++++++++++++++++++++++++
>  1 file changed, 25 insertions(+)
>
> diff --git a/drivers/gpu/drm/tegra/drm.c b/drivers/gpu/drm/tegra/drm.c
> index 272c2dca3536..16c44b9abbd8 100644
> --- a/drivers/gpu/drm/tegra/drm.c
> +++ b/drivers/gpu/drm/tegra/drm.c
> @@ -889,6 +889,30 @@ static int host1x_drm_remove(struct host1x_device *dev)
>         return 0;
>  }
>
> +#ifdef CONFIG_PM_SLEEP
> +static int host1x_drm_suspend(struct device *dev)
> +{
> +       struct drm_device *drm = dev_get_drvdata(dev);
> +
> +       drm_kms_helper_poll_disable(drm);
> +
> +       return 0;
> +}
> +
> +static int host1x_drm_resume(struct device *dev)
> +{
> +       struct drm_device *drm = dev_get_drvdata(dev);
> +
> +       drm_kms_helper_poll_enable(drm);
> +
> +       return 0;
> +}
> +#endif
> +
> +static const struct dev_pm_ops host1x_drm_pm_ops = {
> +       SET_SYSTEM_SLEEP_PM_OPS(host1x_drm_suspend, host1x_drm_resume)
> +};
> +
>  static const struct of_device_id host1x_drm_subdevs[] = {
>         { .compatible = "nvidia,tegra20-dc", },
>         { .compatible = "nvidia,tegra20-hdmi", },
> @@ -910,6 +934,7 @@ static const struct of_device_id host1x_drm_subdevs[] = {
>  static struct host1x_driver host1x_drm_driver = {
>         .driver = {
>                 .name = "drm",
> +               .pm = &host1x_drm_pm_ops,
>         },
>         .probe = host1x_drm_probe,
>         .remove = host1x_drm_remove,
> --
> 2.1.3
>
> --
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