linux-kernel - Re: [PATCH] drm/i915: Don't enable WaIncreaseLatencyIPCEnabled when IPC is disabled

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Message-ID: <20200504161213.GD6112@intel.com>
Date:   Mon, 4 May 2020 19:12:13 +0300
From:   Ville Syrjälä <ville.syrjala@...ux.intel.com>
To:     Sultan Alsawaf <sultan@...neltoast.com>
Cc:     stable@...r.kernel.org, Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/i915: Don't enable WaIncreaseLatencyIPCEnabled when
 IPC is disabled

On Thu, Apr 30, 2020 at 02:46:54PM -0700, Sultan Alsawaf wrote:
> From: Sultan Alsawaf <sultan@...neltoast.com>
> 
> In commit 5a7d202b1574, a logical AND was erroneously changed to an OR,
> causing WaIncreaseLatencyIPCEnabled to be enabled unconditionally for
> kabylake and coffeelake, even when IPC is disabled. Fix the logic so
> that WaIncreaseLatencyIPCEnabled is only used when IPC is enabled.
> 
> Fixes: 5a7d202b1574 ("drm/i915: Drop WaIncreaseLatencyIPCEnabled/1140 for cnl")
> Cc: stable@...r.kernel.org # 5.3.x+
> Signed-off-by: Sultan Alsawaf <sultan@...neltoast.com>
> ---
>  drivers/gpu/drm/i915/intel_pm.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 8375054ba27d..a52986a9e7a6 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -4992,7 +4992,7 @@ static void skl_compute_plane_wm(const struct intel_crtc_state *crtc_state,
>  	 * WaIncreaseLatencyIPCEnabled: kbl,cfl
>  	 * Display WA #1141: kbl,cfl
>  	 */
> -	if ((IS_KABYLAKE(dev_priv) || IS_COFFEELAKE(dev_priv)) ||
> +	if ((IS_KABYLAKE(dev_priv) || IS_COFFEELAKE(dev_priv)) &&

Whoops. Thanks for the fix. Pushed.

>  	    dev_priv->ipc_enabled)
>  		latency += 4;
>  
> -- 
> 2.26.2

-- 
Ville Syrjälä
Intel