Message-ID: <CAA8EJpq6Gkp4W=rGbpY6ASPgoDt=64HTFDk4_OZsTmbSUxhhGw@mail.gmail.com>
Date: Mon, 18 Nov 2024 01:55:54 +0200
From: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>
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Subject: Re: [PATCH 1/5] drm/encoder_slave: make mode_valid accept const
 struct drm_display_mode

On Mon, 18 Nov 2024 at 01:33, Laurent Pinchart
<laurent.pinchart@...asonboard.com> wrote:
>
> 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@...aro.org>
> > >
> > > Reviewed-by: Laurent Pinchart <laurent.pinchart+renesas@...asonboard.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.

Me neither. Probably moving those two and drm_encoder_slave to nouveau
is really the best course for now.

>
> > > > ---
> > > >  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



-- 
With best wishes
Dmitry

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