[PATCH] drm/stm: add sleep power management

[Benjamin Gaignard]

Le mar. 26 mars 2019 à 14:02, Philippe CORNU <philippe.cornu at st.com> a écrit :
>
> (+ Benjamin)
>
> Dear Yannick,
> Many thanks for your patch.
> Acked-by: Philippe Cornu <philippe.cornu at st.com>
>
> Dear Benjamin,
> May I ask you please to merge this patch + "drm/stm: dw_mipi_dsi-stm:
> add sleep power management" on drm-misc, if you agree of course and when
> you think it is the right time (next week?)
> Big thanks,

Applied on drm-misc-next.

Benjamin

>
> Philippe :-)
>
>
> On 3/21/19 9:15 AM, Yannick Fertré wrote:
> > Implements system sleep power management ops.
> >
> > Signed-off-by: Yannick Fertré <yannick.fertre at st.com>
> > ---
> >   drivers/gpu/drm/stm/drv.c  | 35 +++++++++++++++++++++++++++++++++++
> >   drivers/gpu/drm/stm/ltdc.c | 24 ++++++++++++++++++++++++
> >   drivers/gpu/drm/stm/ltdc.h |  3 +++
> >   3 files changed, 62 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/stm/drv.c b/drivers/gpu/drm/stm/drv.c
> > index 0a7f933..5834ef5 100644
> > --- a/drivers/gpu/drm/stm/drv.c
> > +++ b/drivers/gpu/drm/stm/drv.c
> > @@ -129,6 +129,40 @@ static void drv_unload(struct drm_device *ddev)
> >       drm_mode_config_cleanup(ddev);
> >   }
> >
> > +static __maybe_unused int drv_suspend(struct device *dev)
> > +{
> > +     struct drm_device *ddev = dev_get_drvdata(dev);
> > +     struct ltdc_device *ldev = ddev->dev_private;
> > +     struct drm_atomic_state *state;
> > +
> > +     drm_kms_helper_poll_disable(ddev);
> > +     state = drm_atomic_helper_suspend(ddev);
> > +     if (IS_ERR(state)) {
> > +             drm_kms_helper_poll_enable(ddev);
> > +             return PTR_ERR(state);
> > +     }
> > +     ldev->suspend_state = state;
> > +     ltdc_suspend(ddev);
> > +
> > +     return 0;
> > +}
> > +
> > +static __maybe_unused int drv_resume(struct device *dev)
> > +{
> > +     struct drm_device *ddev = dev_get_drvdata(dev);
> > +     struct ltdc_device *ldev = ddev->dev_private;
> > +
> > +     ltdc_resume(ddev);
> > +     drm_atomic_helper_resume(ddev, ldev->suspend_state);
> > +     drm_kms_helper_poll_enable(ddev);
> > +
> > +     return 0;
> > +}
> > +
> > +static const struct dev_pm_ops drv_pm_ops = {
> > +     SET_SYSTEM_SLEEP_PM_OPS(drv_suspend, drv_resume)
> > +};
> > +
> >   static int stm_drm_platform_probe(struct platform_device *pdev)
> >   {
> >       struct device *dev = &pdev->dev;
> > @@ -186,6 +220,7 @@ static struct platform_driver stm_drm_platform_driver = {
> >       .driver = {
> >               .name = "stm32-display",
> >               .of_match_table = drv_dt_ids,
> > +             .pm = &drv_pm_ops,
> >       },
> >   };
> >
> > diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
> > index b1741a9..32fd6a3 100644
> > --- a/drivers/gpu/drm/stm/ltdc.c
> > +++ b/drivers/gpu/drm/stm/ltdc.c
> > @@ -1062,6 +1062,30 @@ static int ltdc_get_caps(struct drm_device *ddev)
> >       return 0;
> >   }
> >
> > +void ltdc_suspend(struct drm_device *ddev)
> > +{
> > +     struct ltdc_device *ldev = ddev->dev_private;
> > +
> > +     DRM_DEBUG_DRIVER("\n");
> > +     clk_disable_unprepare(ldev->pixel_clk);
> > +}
> > +
> > +int ltdc_resume(struct drm_device *ddev)
> > +{
> > +     struct ltdc_device *ldev = ddev->dev_private;
> > +     int ret;
> > +
> > +     DRM_DEBUG_DRIVER("\n");
> > +
> > +     ret = clk_prepare_enable(ldev->pixel_clk);
> > +     if (ret) {
> > +             DRM_ERROR("failed to enable pixel clock (%d)\n", ret);
> > +             return ret;
> > +     }
> > +
> > +     return 0;
> > +}
> > +
> >   int ltdc_load(struct drm_device *ddev)
> >   {
> >       struct platform_device *pdev = to_platform_device(ddev->dev);
> > diff --git a/drivers/gpu/drm/stm/ltdc.h b/drivers/gpu/drm/stm/ltdc.h
> > index e46f477..a1ad0ae 100644
> > --- a/drivers/gpu/drm/stm/ltdc.h
> > +++ b/drivers/gpu/drm/stm/ltdc.h
> > @@ -36,6 +36,7 @@ struct ltdc_device {
> >       u32 error_status;
> >       u32 irq_status;
> >       struct fps_info plane_fpsi[LTDC_MAX_LAYER];
> > +     struct drm_atomic_state *suspend_state;
> >   };
> >
> >   bool ltdc_crtc_scanoutpos(struct drm_device *dev, unsigned int pipe,
> > @@ -45,5 +46,7 @@ bool ltdc_crtc_scanoutpos(struct drm_device *dev, unsigned int pipe,
> >
> >   int ltdc_load(struct drm_device *ddev);
> >   void ltdc_unload(struct drm_device *ddev);
> > +void ltdc_suspend(struct drm_device *ddev);
> > +int ltdc_resume(struct drm_device *ddev);
> >
> >   #endif
> >