Re: [PATCH 1/5] drm/encoder_slave: make mode_valid accept const struct drm_display_mode

[Laurent Pinchart <laurent.pinchart@ideasonboard.com>]

On Mon, Nov 18, 2024 at 01:22:12AM +0200, Dmitry Baryshkov wrote:
> On Sun, 17 Nov 2024 at 22:54, Laurent Pinchart wrote:
> > On Fri, Nov 15, 2024 at 11:09:26PM +0200, Dmitry Baryshkov wrote:
> > > The mode_valid() callbacks of drm_encoder, drm_crtc and drm_bridge
> > > accept const struct drm_display_mode argument. Change the mode_valid
> > > callback of drm_encoder_slave to also accept const argument.
> > >
> > > Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
> >
> > Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
> >
> > On a side note, there's only two I2C slave encoder drivers left... I
> > wonder if we could so something about them. The ch7006 and sil164
> > drivers seem to be used by nouveau only, could they be moved to
> > drivers/gpu/drm/nouveau/ ? We would move the whole drm_encoder_slave
> > implementation there too, and leave it to die (or get taken out of limbo
> > and fixed) with dispnv04.
> 
> Or it might be better to switch to drm_bridge. Currently we also have
> sil164 (sub)drivers in ast and i915 drivers. I don't know if there is
> any common code to share or not. If there is some, it might be nice to
> use common framework.

That would require porting nouveau and i915 to drm_bridge. As much as
I'd love to see that happening, I won't hold my breath.

> > > ---
> > >  drivers/gpu/drm/i2c/ch7006_drv.c          | 2 +-
> > >  drivers/gpu/drm/i2c/sil164_drv.c          | 2 +-
> > >  drivers/gpu/drm/nouveau/dispnv04/tvnv17.c | 2 +-
> > >  include/drm/drm_encoder_slave.h           | 2 +-
> > >  4 files changed, 4 insertions(+), 4 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/i2c/ch7006_drv.c b/drivers/gpu/drm/i2c/ch7006_drv.c
> > > index 131512a5f3bd996ad1e2eb869ffa09837daba0c7..a57f0a41c1a9e2006142fe0bad2914b0c344c82a 100644
> > > --- a/drivers/gpu/drm/i2c/ch7006_drv.c
> > > +++ b/drivers/gpu/drm/i2c/ch7006_drv.c
> > > @@ -104,7 +104,7 @@ static bool ch7006_encoder_mode_fixup(struct drm_encoder *encoder,
> > >  }
> > >
> > >  static int ch7006_encoder_mode_valid(struct drm_encoder *encoder,
> > > -                                  struct drm_display_mode *mode)
> > > +                                  const struct drm_display_mode *mode)
> > >  {
> > >       if (ch7006_lookup_mode(encoder, mode))
> > >               return MODE_OK;
> > > diff --git a/drivers/gpu/drm/i2c/sil164_drv.c b/drivers/gpu/drm/i2c/sil164_drv.c
> > > index ff23422727fce290a188e495d343e32bc2c373ec..708e119072fcb50c31b5596b75dc341429b93697 100644
> > > --- a/drivers/gpu/drm/i2c/sil164_drv.c
> > > +++ b/drivers/gpu/drm/i2c/sil164_drv.c
> > > @@ -255,7 +255,7 @@ sil164_encoder_restore(struct drm_encoder *encoder)
> > >
> > >  static int
> > >  sil164_encoder_mode_valid(struct drm_encoder *encoder,
> > > -                       struct drm_display_mode *mode)
> > > +                       const struct drm_display_mode *mode)
> > >  {
> > >       struct sil164_priv *priv = to_sil164_priv(encoder);
> > >
> > > diff --git a/drivers/gpu/drm/nouveau/dispnv04/tvnv17.c b/drivers/gpu/drm/nouveau/dispnv04/tvnv17.c
> > > index 3ecb101d23e949b753b873d24eec01ad6fe7f5d6..35ad4e10d27323c87704a3ff35b7dc26462c82bd 100644
> > > --- a/drivers/gpu/drm/nouveau/dispnv04/tvnv17.c
> > > +++ b/drivers/gpu/drm/nouveau/dispnv04/tvnv17.c
> > > @@ -308,7 +308,7 @@ static int nv17_tv_get_modes(struct drm_encoder *encoder,
> > >  }
> > >
> > >  static int nv17_tv_mode_valid(struct drm_encoder *encoder,
> > > -                           struct drm_display_mode *mode)
> > > +                           const struct drm_display_mode *mode)
> > >  {
> > >       struct nv17_tv_norm_params *tv_norm = get_tv_norm(encoder);
> > >
> > > diff --git a/include/drm/drm_encoder_slave.h b/include/drm/drm_encoder_slave.h
> > > index 49172166a164474f43e4afb2eeeb3cde8ae7c61a..b526643833dcf78bae29f9fbbe27de3f730b55d8 100644
> > > --- a/include/drm/drm_encoder_slave.h
> > > +++ b/include/drm/drm_encoder_slave.h
> > > @@ -85,7 +85,7 @@ struct drm_encoder_slave_funcs {
> > >        * @mode_valid: Analogous to &drm_encoder_helper_funcs @mode_valid.
> > >        */
> > >       int (*mode_valid)(struct drm_encoder *encoder,
> > > -                       struct drm_display_mode *mode);
> > > +                       const struct drm_display_mode *mode);
> > >       /**
> > >        * @mode_set: Analogous to &drm_encoder_helper_funcs @mode_set
> > >        * callback. Wrapped by drm_i2c_encoder_mode_set().
> > >

-- 
Regards,

Laurent Pinchart