Re: [PATCH 4/4] drm/i915: Drop WaIncreaseLatencyIPCEnabled/1140 for cnl

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

On Thu, Jan 31, 2019 at 09:42:16AM +0200, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> 
> Drop WaIncreaseLatencyIPCEnabled/Display w/a #1140 for
> early cnl steppings. Also switch the kbl/cfl case to check
> for IS_GEN9_BC() for brevity. It ends up being the same thing
> because IPC is disabled on SKL due to w/a #0477.

I think this deserves a commend in the code, otherwise someone
in the future might not notice that and send a patch to replace
9_BC per KBL || CFL...

anyway:

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>



> 
> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
> ---
>  drivers/gpu/drm/i915/intel_pm.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 306e41ccc50e..55491e2d5134 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -4701,9 +4701,7 @@ static void skl_compute_plane_wm(const struct intel_crtc_state *cstate,
>  	 * WaIncreaseLatencyIPCEnabled: kbl,cfl
>  	 * Display WA #1141: kbl,cfl
>  	 */
> -	if ((IS_KABYLAKE(dev_priv) || IS_COFFEELAKE(dev_priv) ||
> -	    IS_CNL_REVID(dev_priv, CNL_REVID_A0, CNL_REVID_B0)) &&
> -	    dev_priv->ipc_enabled)
> +	if (IS_GEN9_BC(dev_priv) && dev_priv->ipc_enabled)
>  		latency += 4;
>  
>  	if (skl_needs_memory_bw_wa(dev_priv) && wp->x_tiled)
> -- 
> 2.19.2
> 
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