[RFC PATCH 05/17] drm/exynos: dsi: Get the mode from bridge

[Sam Ravnborg]

On Thu, Jul 29, 2021 at 03:20:17PM +0200, Robert Foss wrote:
> Hey Jagan,
> 
> On Sun, 4 Jul 2021 at 11:04, Jagan Teki <jagan at amarulasolutions.com> wrote:
> >
> > Now the exynos dsi driver is fully aware of bridge
> > handling, so get the display mode from bridge, mode_set
> > API instead of legacy encoder crtc.
> >
> > This makes bridge usage more efficient instead of relying
> > on encoder stack.
> >
> > Add mode_set in drm_bridge_funcs.
> >
> > Signed-off-by: Jagan Teki <jagan at amarulasolutions.com>
> > ---
> >  drivers/gpu/drm/exynos/exynos_drm_dsi.c | 13 ++++++++++++-
> >  1 file changed, 12 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/exynos/exynos_drm_dsi.c b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> > index d828be07c325..99a1b8c22313 100644
> > --- a/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> > +++ b/drivers/gpu/drm/exynos/exynos_drm_dsi.c
> > @@ -275,6 +275,7 @@ struct exynos_dsi {
> >         u32 format;
> >
> >         int state;
> > +       struct drm_display_mode mode;
> >         struct drm_property *brightness;
> >         struct completion completed;
> >
> > @@ -881,7 +882,7 @@ static int exynos_dsi_init_link(struct exynos_dsi *dsi)
> >
> >  static void exynos_dsi_set_display_mode(struct exynos_dsi *dsi)
> >  {
> > -       struct drm_display_mode *m = &dsi->encoder.crtc->state->adjusted_mode;
> > +       struct drm_display_mode *m = &dsi->mode;
> >         unsigned int num_bits_resol = dsi->driver_data->num_bits_resol;
> >         u32 reg;
> >
> > @@ -1411,6 +1412,15 @@ static void exynos_dsi_bridge_disable(struct drm_bridge *bridge)
> >         pm_runtime_put_sync(dsi->dev);
> >  }
> >
> > +static void exynos_dsi_bridge_mode_set(struct drm_bridge *bridge,
> > +                                      const struct drm_display_mode *mode,
> > +                                      const struct drm_display_mode *adjusted_mode)
> > +{
> > +       struct exynos_dsi *dsi = bridge_to_dsi(bridge);
> > +
> > +       drm_mode_copy(&dsi->mode, adjusted_mode);
> > +}
> > +
> >  static int exynos_dsi_panel_or_bridge(struct exynos_dsi *dsi,
> >                                       struct device_node *node)
> >  {
> > @@ -1451,6 +1461,7 @@ static int exynos_dsi_bridge_attach(struct drm_bridge *bridge,
> >  static const struct drm_bridge_funcs exynos_dsi_bridge_funcs = {
> >         .enable = exynos_dsi_bridge_enable,
> >         .disable = exynos_dsi_bridge_disable,
> > +       .mode_set = exynos_dsi_bridge_mode_set,
> 
> As far as I understand it, .enable(), .disable() &.mode_set() are
> deprecated[1] and should be replaced by atomic_enable(),
> atomic_disable() & atomic_enable() respectively.
> 
> [1] https://lore.kernel.org/dri-devel/20210722062246.2512666-8-sam@ravnborg.org/

Correct, we are slowly moving away from the deprecated bridge functions.
Need to find time to update my patchset that address some of this.

	Sam