Re: [PATCH 6/8] drm/i915/icp: Add backlight Support for ICP

[Rodrigo Vivi <rodrigo.vivi@intel.com>]

On Thu, Jan 11, 2018 at 09:48:57PM +0000, James Ausmus wrote:
> On Thu, Jan 11, 2018 at 04:00:08PM -0200, Paulo Zanoni wrote:
> > From: Anusha Srivatsa <anusha.srivatsa@intel.com>
> >
> > ICP has two backlight controllers - similar to previous platforms like
> > BXT.
> >
> > v2: Remove the usage of ICP_SECOND_PPS_BACKLIGHT register.(Jani)
> > Reuse BXT code since it is very similar.(Ville)
> >
> > v3 (from Paulo): Rebase.
> >
> > Cc: Jani Nikula <jani.nikula@intel.com>
> > Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> > Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
> > Signed-off-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
> > ---
> >  drivers/gpu/drm/i915/intel_panel.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
> > index fa6831f8c004..ad80cca8c110 100644
> > --- a/drivers/gpu/drm/i915/intel_panel.c
> > +++ b/drivers/gpu/drm/i915/intel_panel.c
> > @@ -1865,7 +1865,7 @@ intel_panel_init_backlight_funcs(struct intel_panel *panel)
> >  		panel->backlight.set = bxt_set_backlight;
> >  		panel->backlight.get = bxt_get_backlight;
> >  		panel->backlight.hz_to_pwm = bxt_hz_to_pwm;
> > -	} else if (HAS_PCH_CNP(dev_priv)) {
> > +	} else if (HAS_PCH_CNP(dev_priv) || HAS_PCH_ICP(dev_priv)) {
>
> The commit message says reuse BXT, but the code says reuse CNP - which
> one should it be?

well,
CNP is like BXT, but with only one controller.
ICP is like BXT, including 2 controllers.

I don't know if it makes more sense re-use the cnp or bxt functions

But one way or another we have to address these lines from cnp_setup:

 /*
         * CNP has the BXT implementation of backlight, but with only
         * one controller. Future platforms could have multiple controll\
ers
         * so let's make this extensible and prepared for the future.
         */
        panel->backlight.controller = 0;

>
> >  		panel->backlight.setup = cnp_setup_backlight;
> >  		panel->backlight.enable = cnp_enable_backlight;
> >  		panel->backlight.disable = cnp_disable_backlight;
> > --
> > 2.14.3
> >
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