On Mon, Sep 26, 2022 at 01:58:42PM +0300, Luca Coelho wrote:
> On Mon, 2022-09-12 at 14:18 +0300, Ville Syrjala wrote:
> > From: Ville Syrjälä <ville.syrj...@linux.intel.com>
> >
> > Pull the eDP backlight setup ino its own function. No
> > reason to pollute intel_edp_init_connector() with all
> > the mundane details.
> >
> > Signed-off-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
> > ---
> > drivers/gpu/drm/i915/display/intel_dp.c | 51 +++++++++++++++----------
> > 1 file changed, 30 insertions(+), 21 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_dp.c
> > b/drivers/gpu/drm/i915/display/intel_dp.c
> > index a5eca5396fed..de5a4d2df78e 100644
> > --- a/drivers/gpu/drm/i915/display/intel_dp.c
> > +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> > @@ -5217,6 +5217,35 @@ intel_edp_add_properties(struct intel_dp *intel_dp)
> > fixed_mode->vdisplay);
> > }
> >
> > +static void intel_edp_backlight_setup(struct intel_dp *intel_dp,
> > + struct intel_connector *connector)
> > +{
> > + struct drm_i915_private *i915 = dp_to_i915(intel_dp);
> > + enum pipe pipe = INVALID_PIPE;
> > +
> > + if (IS_VALLEYVIEW(i915) || IS_CHERRYVIEW(i915)) {
>
> Isn't this too restrictive? Isn't there another way to check whether
> the hardware supports backlight?
That's not what we're checking.
Only VLV/CHV have per-pipe backlight registers, whereas
other platforms have less insane design. So we only need
to figure out the pipe on VLV/CHV.
>
>
> > + /*
> > + * Figure out the current pipe for the initial backlight setup.
> > + * If the current pipe isn't valid, try the PPS pipe, and if
> > that
> > + * fails just assume pipe A.
> > + */
> > + pipe = vlv_active_pipe(intel_dp);
> > +
> > + if (pipe != PIPE_A && pipe != PIPE_B)
> > + pipe = intel_dp->pps.pps_pipe;
> > +
> > + if (pipe != PIPE_A && pipe != PIPE_B)
> > + pipe = PIPE_A;
> > +
> > + drm_dbg_kms(&i915->drm,
> > + "[CONNECTOR:%d:%s] using pipe %c for initial
> > backlight setup\n",
> > + connector->base.base.id, connector->base.name,
> > + pipe_name(pipe));
> > + }
> > +
> > + intel_backlight_setup(connector, pipe);
>
> In most cases we will call intel_backlight_setup() with INVALID_PIPE.
> Wouldn't it be better to skip this call completely in that case?
INVALD_PIPE doesn't mean "no backlight", it just means we don't
care about the pipe.
--
Ville Syrjälä
Intel
