linux-kernel - [PATCH 4.19 102/118] drm/i915: Downgrade Gen9 Plane WM latency error

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Date:   Tue, 11 Dec 2018 16:42:01 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Chris Wilson <chris@...is-wilson.co.uk>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Ville Syrjala <ville.syrjala@...ux.intel.com>
Subject: [PATCH 4.19 102/118] drm/i915: Downgrade Gen9 Plane WM latency error

4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Chris Wilson <chris@...is-wilson.co.uk>

commit 86c1c87d0e6241cbe35bd52badfc84b154e1b959 upstream.

According to intel_read_wm_latency() it is perfectly legal for one WM
and all subsequent levels to be 0 (and the deeper powersaving states
disabled), so don't shout *ERROR*, over and over again.

Signed-off-by: Chris Wilson <chris@...is-wilson.co.uk>
Cc: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
Cc: Ville Syrjala <ville.syrjala@...ux.intel.com>
Acked-by: Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180726161527.10516-1-chris@chris-wilson.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/gpu/drm/i915/intel_pm.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -2951,8 +2951,8 @@ static void intel_print_wm_latency(struc
 		unsigned int latency = wm[level];
 
 		if (latency == 0) {
-			DRM_ERROR("%s WM%d latency not provided\n",
-				  name, level);
+			DRM_DEBUG_KMS("%s WM%d latency not provided\n",
+				      name, level);
 			continue;
 		}