linux-kernel - Re: [PATCH v2] drm_bridge: register content protect property

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Message-ID: <CAOw6vbLPUkwoaSHyWARZnkcsacf9rsmB6M=97z1-98kgM7BNEQ@mail.gmail.com>
Date:   Tue, 18 Oct 2022 14:25:41 -0400
From:   Sean Paul <seanpaul@...omium.org>
To:     Hsin-Yi Wang <hsinyi@...omium.org>
Cc:     Douglas Anderson <dianders@...omium.org>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel <dri-devel@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] drm_bridge: register content protect property

On Mon, Oct 17, 2022 at 9:49 AM Hsin-Yi Wang <hsinyi@...omium.org> wrote:
>
> On Wed, Oct 12, 2022 at 12:20 PM Hsin-Yi Wang <hsinyi@...omium.org> wrote:
> >
> > Some bridges are able to update HDCP status from userspace request if
> > they support HDCP.
> >
> > HDCP property is the same as other connector properties that need to be
> > created after the connecter is initialized and before the connector is
> > registered.
> >
> anx7625 is a user for this.

I feel like we should not unconditionally attach this property for
bridges, this should be done in the driver which supports it IMO.

Sean

>
>
> > Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
> > Reported-by: kernel test robot <lkp@...el.com>
> > ---
> > v2: Fix compile error when config is not set.
> > ---
> >  drivers/gpu/drm/drm_bridge_connector.c | 3 +++
> >  include/drm/display/drm_hdcp_helper.h  | 8 ++++++++
> >  2 files changed, 11 insertions(+)
> >
> > diff --git a/drivers/gpu/drm/drm_bridge_connector.c b/drivers/gpu/drm/drm_bridge_connector.c
> > index 1c7d936523df5..a3b9ef8dc3f0b 100644
> > --- a/drivers/gpu/drm/drm_bridge_connector.c
> > +++ b/drivers/gpu/drm/drm_bridge_connector.c
> > @@ -7,6 +7,7 @@
> >  #include <linux/module.h>
> >  #include <linux/slab.h>
> >
> > +#include <drm/display/drm_hdcp_helper.h>
> >  #include <drm/drm_atomic_state_helper.h>
> >  #include <drm/drm_bridge.h>
> >  #include <drm/drm_bridge_connector.h>
> > @@ -398,6 +399,8 @@ struct drm_connector *drm_bridge_connector_init(struct drm_device *drm,
> >         if (panel_bridge)
> >                 drm_panel_bridge_set_orientation(connector, panel_bridge);
> >
> > +       drm_connector_attach_content_protection_property(connector, true);
> > +
> >         return connector;
> >  }
> >  EXPORT_SYMBOL_GPL(drm_bridge_connector_init);
> > diff --git a/include/drm/display/drm_hdcp_helper.h b/include/drm/display/drm_hdcp_helper.h
> > index 8aaf87bf27351..c65d9f06a2532 100644
> > --- a/include/drm/display/drm_hdcp_helper.h
> > +++ b/include/drm/display/drm_hdcp_helper.h
> > @@ -15,8 +15,16 @@ struct drm_device;
> >  struct drm_connector;
> >
> >  int drm_hdcp_check_ksvs_revoked(struct drm_device *dev, u8 *ksvs, u32 ksv_count);
> > +#if defined(CONFIG_DRM_DISPLAY_HDCP_HELPER)
> >  int drm_connector_attach_content_protection_property(struct drm_connector *connector,
> >                                                      bool hdcp_content_type);
> > +#else
> > +static inline int drm_connector_attach_content_protection_property(struct drm_connector *connector,
> > +                                                                  bool hdcp_content_type)
> > +{
> > +       return 0;
> > +}
> > +#endif
> >  void drm_hdcp_update_content_protection(struct drm_connector *connector, u64 val);
> >
> >  #endif
> > --
> > 2.38.0.rc1.362.ged0d419d3c-goog
> >