[PATCH hwc v2 06/18] drm_hwcomposer: Add writeback connector support

[Alexandru-Cosmin Gheorghe]

Hi Sean,

On Mon, Apr 16, 2018 at 03:59:07PM -0400, Sean Paul wrote:
> On Wed, Apr 11, 2018 at 04:22:17PM +0100, Alexandru Gheorghe wrote:
> > Writeback connector is a special case of connector, which can be
> > linked to a CRTC in order to get the result of the composition back to
> > a memory buffer. This had not been merged to the mainline kernel yet,
> > latest version of the kernel patches could be found here [1].
> > 
> > [1] https://lists.freedesktop.org/archives/dri-devel/2018-February/167703.html
> > 
> > Signed-off-by: Alexandru Gheorghe <alexandru-cosmin.gheorghe at arm.com>
> > ---
> >  drmconnector.cpp | 42 +++++++++++++++++++++++++++++++++++++++++-
> >  drmconnector.h   |  7 +++++++
> >  2 files changed, 48 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drmconnector.cpp b/drmconnector.cpp
> > index 145518f..e482832 100644
> > --- a/drmconnector.cpp
> > +++ b/drmconnector.cpp
> > @@ -52,6 +52,26 @@ int DrmConnector::Init() {
> >      ALOGE("Could not get CRTC_ID property\n");
> >      return ret;
> >    }
> > +  if (writeback()) {
> > +    ret = drm_->GetConnectorProperty(*this, "WRITEBACK_PIXEL_FORMATS",
> > +                                     &writeback_pixel_formats_);
> > +    if (ret) {
> > +      ALOGE("Could not get WRITEBACK_PIXEL_FORMATS connector_id = %d\n", id_);
> > +      return ret;
> > +    }
> > +    ret =
> > +        drm_->GetConnectorProperty(*this, "WRITEBACK_FB_ID", &writeback_fb_id_);
> 
> Please break on the function arguments instead of the =

It's clang-format-diff-3.8 fault again.
Will do.

> 
> 
> > +    if (ret) {
> > +      ALOGE("Could not get WRITEBACK_FB_ID connector_id = %d\n", id_);
> > +      return ret;
> > +    }
> > +    ret = drm_->GetConnectorProperty(*this, "WRITEBACK_OUT_FENCE_PTR",
> > +                                     &writeback_out_fence_);
> 
> Like this :)

That's me :).

> 
> With that,
> 
> Reviewed-by: Sean Paul <seanpaul at chromium.org>
> 
> 
> 
> 
> > +    if (ret) {
> > +      ALOGE("Could not get WRITEBACK_OUT_FENCE_PTR connector_id = %d\n", id_);
> > +      return ret;
> > +    }
> > +  }
> >    return 0;
> >  }
> >  
> > @@ -78,8 +98,16 @@ bool DrmConnector::external() const {
> >           type_ == DRM_MODE_CONNECTOR_VGA;
> >  }
> >  
> > +bool DrmConnector::writeback() const {
> > +#ifdef DRM_MODE_CONNECTOR_WRITEBACK
> > +  return type_ == DRM_MODE_CONNECTOR_WRITEBACK;
> > +#else
> > +  return false;
> > +#endif
> > +}
> > +
> >  bool DrmConnector::valid_type() const {
> > -  return internal() || external();
> > +  return internal() || external() || writeback();
> >  }
> >  
> >  int DrmConnector::UpdateModes() {
> > @@ -130,6 +158,18 @@ const DrmProperty &DrmConnector::crtc_id_property() const {
> >    return crtc_id_property_;
> >  }
> >  
> > +const DrmProperty &DrmConnector::writeback_pixel_formats() const {
> > +  return writeback_pixel_formats_;
> > +}
> > +
> > +const DrmProperty &DrmConnector::writeback_fb_id() const {
> > +  return writeback_fb_id_;
> > +}
> > +
> > +const DrmProperty &DrmConnector::writeback_out_fence() const {
> > +  return writeback_out_fence_;
> > +}
> > +
> >  DrmEncoder *DrmConnector::encoder() const {
> >    return encoder_;
> >  }
> > diff --git a/drmconnector.h b/drmconnector.h
> > index 5601e06..e139730 100644
> > --- a/drmconnector.h
> > +++ b/drmconnector.h
> > @@ -46,6 +46,7 @@ class DrmConnector {
> >  
> >    bool internal() const;
> >    bool external() const;
> > +  bool writeback() const;
> >    bool valid_type() const;
> >  
> >    int UpdateModes();
> > @@ -58,6 +59,9 @@ class DrmConnector {
> >  
> >    const DrmProperty &dpms_property() const;
> >    const DrmProperty &crtc_id_property() const;
> > +  const DrmProperty &writeback_pixel_formats() const;
> > +  const DrmProperty &writeback_fb_id() const;
> > +  const DrmProperty &writeback_out_fence() const;
> >  
> >    const std::vector<DrmEncoder *> &possible_encoders() const {
> >      return possible_encoders_;
> > @@ -88,6 +92,9 @@ class DrmConnector {
> >  
> >    DrmProperty dpms_property_;
> >    DrmProperty crtc_id_property_;
> > +  DrmProperty writeback_pixel_formats_;
> > +  DrmProperty writeback_fb_id_;
> > +  DrmProperty writeback_out_fence_;
> >  
> >    std::vector<DrmEncoder *> possible_encoders_;
> >  };
> > -- 
> > 2.7.4
> > 
> 
> -- 
> Sean Paul, Software Engineer, Google / Chromium OS

-- 
Cheers,
Alex G