[Intel-gfx] [PATCH] drm/i915: Implement w/a 22010492432 for adl-s

[Matt Roper]

On Mon, Jun 13, 2022 at 11:14:39PM +0300, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> adl-s needs the combo PLL DCO fraction w/a as well.
> Get us slightly more accurate clock out of the PLL.
> 
> Cc: stable at vger.kernel.org
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

Reviewed-by: Matt Roper <matthew.d.roper at intel.com>

> ---
>  drivers/gpu/drm/i915/display/intel_dpll_mgr.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
> index 64708e874b13..982e5b945680 100644
> --- a/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
> +++ b/drivers/gpu/drm/i915/display/intel_dpll_mgr.c
> @@ -2459,7 +2459,7 @@ static void icl_wrpll_params_populate(struct skl_wrpll_params *params,
>  }
>  
>  /*
> - * Display WA #22010492432: ehl, tgl, adl-p
> + * Display WA #22010492432: ehl, tgl, adl-s, adl-p
>   * Program half of the nominal DCO divider fraction value.
>   */
>  static bool
> @@ -2467,7 +2467,7 @@ ehl_combo_pll_div_frac_wa_needed(struct drm_i915_private *i915)
>  {
>  	return ((IS_PLATFORM(i915, INTEL_ELKHARTLAKE) &&
>  		 IS_JSL_EHL_DISPLAY_STEP(i915, STEP_B0, STEP_FOREVER)) ||
> -		 IS_TIGERLAKE(i915) || IS_ALDERLAKE_P(i915)) &&
> +		 IS_TIGERLAKE(i915) || IS_ALDERLAKE_S(i915) || IS_ALDERLAKE_P(i915)) &&
>  		 i915->dpll.ref_clks.nssc == 38400;
>  }
>  
> -- 
> 2.35.1
> 

-- 
Matt Roper
Graphics Software Engineer
VTT-OSGC Platform Enablement
Intel Corporation