linux-kernel - RE: [RFC PATCH 7/8] drm/rcar_du: Adapt vkms writeback to new drm_writeback

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Message-ID: <DM3PPF208195D8DB9C9690300904F07722BE328A@DM3PPF208195D8D.namprd11.prod.outlook.com>
Date: Mon, 11 Aug 2025 09:47:04 +0000
From: "Kandpal, Suraj" <suraj.kandpal@...el.com>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>
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Subject: RE: [RFC PATCH 7/8] drm/rcar_du: Adapt vkms writeback to new
 drm_writeback_connector

> > Signed-off-by: Suraj Kandpal <suraj.kandpal@...el.com>
> > ---
> >  .../gpu/drm/renesas/rcar-du/rcar_du_crtc.h    |  4 ++--
> >  .../drm/renesas/rcar-du/rcar_du_writeback.c   | 22 +++++++++++--------
> >  2 files changed, 15 insertions(+), 11 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/renesas/rcar-du/rcar_du_crtc.h
> > b/drivers/gpu/drm/renesas/rcar-du/rcar_du_crtc.h
> > index d0f38a8b3561..457c803d75bc 100644
> > --- a/drivers/gpu/drm/renesas/rcar-du/rcar_du_crtc.h
> > +++ b/drivers/gpu/drm/renesas/rcar-du/rcar_du_crtc.h
> > @@ -72,11 +72,11 @@ struct rcar_du_crtc {
> >  	const char *const *sources;
> >  	unsigned int sources_count;
> >
> > -	struct drm_writeback_connector writeback;
> > +	struct drm_connector connector;
> 
> You forgot to update the documentation of the structure.
> 
> "connector" is a too generic name. I'd keep the existing field name.
> 

Sure will leave the name as writeback 

> >  };
> >
> >  #define to_rcar_crtc(c)		container_of(c, struct rcar_du_crtc,
> crtc)
> > -#define wb_to_rcar_crtc(c)	container_of(c, struct rcar_du_crtc, writeback)
> > +#define connector_to_rcar_crtc(c)	container_of(c, struct rcar_du_crtc,
> connector)
> >
> >  /**
> >   * struct rcar_du_crtc_state - Driver-specific CRTC state diff --git
> > a/drivers/gpu/drm/renesas/rcar-du/rcar_du_writeback.c
> > b/drivers/gpu/drm/renesas/rcar-du/rcar_du_writeback.c
> > index 9986a10e8114..95e6810612c2 100644
> > --- a/drivers/gpu/drm/renesas/rcar-du/rcar_du_writeback.c
> > +++ b/drivers/gpu/drm/renesas/rcar-du/rcar_du_writeback.c
> > @@ -47,10 +47,12 @@ static int rcar_du_wb_conn_get_modes(struct
> drm_connector *connector)
> >  				    dev->mode_config.max_height);  }
> >
> > -static int rcar_du_wb_prepare_job(struct drm_writeback_connector
> > *connector,
> > +static int rcar_du_wb_prepare_job(struct drm_writeback_connector
> > +*wb_connector,
> >  				  struct drm_writeback_job *job)
> >  {
> > -	struct rcar_du_crtc *rcrtc = wb_to_rcar_crtc(connector);
> > +	struct drm_connector *connector =
> > +		container_of(wb_connector, struct drm_connector, writeback);
> > +	struct rcar_du_crtc *rcrtc = connector_to_rcar_crtc(connector);
> 
> Modify wb_to_rcar_crtc() instead of changing the code here and below.
> 

Sure will modify that when I send this as a real series once I get the Ack for this design.

Regards,
Suraj Kandpal

> >  	struct rcar_du_wb_job *rjob;
> >  	int ret;
> >
> > @@ -72,10 +74,12 @@ static int rcar_du_wb_prepare_job(struct
> drm_writeback_connector *connector,
> >  	return 0;
> >  }
> >
> > -static void rcar_du_wb_cleanup_job(struct drm_writeback_connector
> > *connector,
> > +static void rcar_du_wb_cleanup_job(struct drm_writeback_connector
> > +*wb_connector,
> >  				   struct drm_writeback_job *job)  {
> > -	struct rcar_du_crtc *rcrtc = wb_to_rcar_crtc(connector);
> > +	struct drm_connector *connector =
> > +		container_of(wb_connector, struct drm_connector, writeback);
> > +	struct rcar_du_crtc *rcrtc = connector_to_rcar_crtc(connector);
> >  	struct rcar_du_wb_job *rjob = job->priv;
> >
> >  	if (!job->fb)
> > @@ -199,7 +203,7 @@ static const u32 writeback_formats[] = {  int
> > rcar_du_writeback_init(struct rcar_du_device *rcdu,
> >  			   struct rcar_du_crtc *rcrtc)
> >  {
> > -	struct drm_writeback_connector *wb_conn = &rcrtc->writeback;
> > +	struct drm_writeback_connector *wb_conn =
> > +&rcrtc->connector.writeback;
> >
> >  	struct drm_encoder *encoder;
> >
> > @@ -212,7 +216,7 @@ int rcar_du_writeback_init(struct rcar_du_device
> > *rcdu,
> >
> >  	encoder->possible_crtcs = 1 << drm_crtc_index(&rcrtc->crtc);
> >
> > -	drm_connector_helper_add(&wb_conn->base,
> > +	drm_connector_helper_add(&rcrtc->connector,
> >  				 &rcar_du_wb_conn_helper_funcs);
> >
> >  	return drmm_writeback_connector_init(&rcdu->ddev, wb_conn, @@ -
> 231,7
> > +235,7 @@ void rcar_du_writeback_setup(struct rcar_du_crtc *rcrtc,
> >  	struct drm_framebuffer *fb;
> >  	unsigned int i;
> >
> > -	state = rcrtc->writeback.base.state;
> > +	state = rcrtc->connector.state;
> >  	if (!state || !state->writeback_job)
> >  		return;
> >
> > @@ -246,10 +250,10 @@ void rcar_du_writeback_setup(struct rcar_du_crtc
> *rcrtc,
> >  		cfg->mem[i] = sg_dma_address(rjob->sg_tables[i].sgl)
> >  			    + fb->offsets[i];
> >
> > -	drm_writeback_queue_job(&rcrtc->writeback, state);
> > +	drm_writeback_queue_job(&rcrtc->connector.writeback, state);
> >  }
> >
> >  void rcar_du_writeback_complete(struct rcar_du_crtc *rcrtc)  {
> > -	drm_writeback_signal_completion(&rcrtc->writeback, 0);
> > +	drm_writeback_signal_completion(&rcrtc->connector.writeback, 0);
> >  }
> 
> --
> Regards,
> 
> Laurent Pinchart