[Intel-gfx] [PATCH 06/15] drm/i915: Extract intel_edp_backlight_setup()

[Luca Coelho]

On Mon, 2022-09-12 at 14:18 +0300, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala at 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.syrjala at 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?


> +		/*
> +		 * 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?

--
Cheers,
Luca.