Re: [PATCH] drm/i915: remove intermediate link rate entries for CHV

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

On Thu, 30 Jul 2015, Sivakumar Thulasimani <sivakumar.thulasimani@intel.com> wrote:
> From: "Thulasimani,Sivakumar" <sivakumar.thulasimani@intel.com>
>
> CHV does not support intermediate link rates nor does it support
> HBR2. This patch removes those entries and returns HBR as the max
> link rate supported on CHV platform.

These are two separate changes, and should be two separate
patches. Moreover, the intermediate link rate change should be a revert
of

commit fe51bfb95c996733150c44d21e1c9f4b6322a326
Author: Ville Syrjälä <ville.syrjala@linux.intel.com>
Date:   Thu Mar 12 17:10:38 2015 +0200

    drm/i915: Add eDP intermediate frequencies for CHV

with Cc: Ville and Sonika to record this back and forth here.

BR,
Jani.


>
> Signed-off-by: Sivakumar Thulasimani <sivakumar.thulasimani@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_dp.c |   11 +++--------
>  1 file changed, 3 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 898dc74..5c68b17 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -95,9 +95,6 @@ static const int bxt_rates[] = { 162000, 216000, 243000, 270000,
>  				  324000, 432000, 540000 };
>  static const int skl_rates[] = { 162000, 216000, 270000,
>  				  324000, 432000, 540000 };
> -static const int chv_rates[] = { 162000, 202500, 210000, 216000,
> -				 243000, 270000, 324000, 405000,
> -				 420000, 432000, 540000 };
>  static const int default_rates[] = { 162000, 270000, 540000 };
>  
>  /**
> @@ -1186,15 +1183,13 @@ intel_dp_source_rates(struct drm_device *dev, const int **source_rates)
>  	} else if (IS_SKYLAKE(dev)) {
>  		*source_rates = skl_rates;
>  		return ARRAY_SIZE(skl_rates);
> -	} else if (IS_CHERRYVIEW(dev)) {
> -		*source_rates = chv_rates;
> -		return ARRAY_SIZE(chv_rates);
>  	}
>  
>  	*source_rates = default_rates;
>  
> -	if (IS_SKYLAKE(dev) && INTEL_REVID(dev) <= SKL_REVID_B0)
> -		/* WaDisableHBR2:skl */
> +	/* WaDisableHBR2:skl */
> +	if ((IS_SKYLAKE(dev) && INTEL_REVID(dev) <= SKL_REVID_B0) ||
> +		IS_CHERRYVIEW(dev))
>  		return (DP_LINK_BW_2_7 >> 3) + 1;
>  	else if (INTEL_INFO(dev)->gen >= 8 ||
>  	    (IS_HASWELL(dev) && !IS_HSW_ULX(dev)))
> -- 
> 1.7.9.5
>
> _______________________________________________
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-- 
Jani Nikula, Intel Open Source Technology Center
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