Re: [RFC] drm/i915/edp: use max lanes and clock for edp

[Jani Nikula <jani.nikula@intel.com>]

On Tue, 02 Sep 2014, Jani Nikula <jani.nikula@intel.com> wrote:
> How about throwing this at any eDP link parameter bugs and regressions?
> Does it feel too much like giving up the battle?

Fixes at least one bug...

https://bugs.freedesktop.org/show_bug.cgi?id=79386#c15

> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_dp.c | 24 +++++++-----------------
>  1 file changed, 7 insertions(+), 17 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index d7fc2c0e9ba8..f4248d7f64f9 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -889,23 +889,13 @@ intel_dp_compute_config(struct intel_encoder *encoder,
>  			bpp = dev_priv->vbt.edp_bpp;
>  		}
>  
> -		if (IS_BROADWELL(dev)) {
> -			/* Yes, it's an ugly hack. */
> -			min_lane_count = max_lane_count;
> -			DRM_DEBUG_KMS("forcing lane count to max (%u) on BDW\n",
> -				      min_lane_count);
> -		} else if (dev_priv->vbt.edp_lanes) {
> -			min_lane_count = min(dev_priv->vbt.edp_lanes,
> -					     max_lane_count);
> -			DRM_DEBUG_KMS("using min %u lanes per VBT\n",
> -				      min_lane_count);
> -		}
> -
> -		if (dev_priv->vbt.edp_rate) {
> -			min_clock = min(dev_priv->vbt.edp_rate >> 3, max_clock);
> -			DRM_DEBUG_KMS("using min %02x link bw per VBT\n",
> -				      bws[min_clock]);
> -		}
> +		/*
> +		 * Use the maximum clock and number of lanes the eDP panel
> +		 * advertizes being capable of. Typically these values
> +		 * correspond to the native resolution of the panel.
> +		 */
> +		min_lane_count = max_lane_count;
> +		min_clock = max_clock;
>  	}
>  
>  	for (; bpp >= 6*3; bpp -= 2*3) {
> -- 
> 1.9.1
>

-- 
Jani Nikula, Intel Open Source Technology Center