[PATCH V3 1/2][SRU][OEM-OSP1-B] drm/i915/fbc: disable framebuffer compression on GeminiLake

[You-Sheng Yang]

From: Daniel Drake <drake at endlessm.com>

BugLink: https://bugs.launchpad.net/bugs/1840236

On many (all?) the Gemini Lake systems we work with, there is frequent
momentary graphical corruption at the top of the screen, and it seems
that disabling framebuffer compression can avoid this.

The ticket was reported 6 months ago and has already affected a
multitude of users, without any real progress being made. So, lets
disable framebuffer compression on GeminiLake until a solution is found.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=108085
Fixes: fd7d6c5c8f3e ("drm/i915: enable FBC on gen9+ too")
Cc: Paulo Zanoni <paulo.r.zanoni at intel.com>
Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
Cc: Jani Nikula <jani.nikula at linux.intel.com>
Cc: <stable at vger.kernel.org> # v4.11+
Reviewed-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
Signed-off-by: Daniel Drake <drake at endlessm.com>
Signed-off-by: Jian-Hong Pan <jian-hong at endlessm.com>
Signed-off-by: Jani Nikula <jani.nikula at intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190423092810.28359-1-jian-hong@endlessm.com
(cherry picked from commit 1d25724b41fad7eeb2c3058a5c8190d6ece73e08)
Signed-off-by: You-Sheng Yang <vicamo.yang at canonical.com>
---
 drivers/gpu/drm/i915/intel_fbc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_fbc.c b/drivers/gpu/drm/i915/intel_fbc.c
index 8b9c92e80715b..6d3c5057b2413 100644
--- a/drivers/gpu/drm/i915/intel_fbc.c
+++ b/drivers/gpu/drm/i915/intel_fbc.c
@@ -1279,6 +1279,10 @@ static int intel_sanitize_fbc_option(struct drm_i915_private *dev_priv)
 	if (!HAS_FBC(dev_priv))
 		return 0;
 
+	/* https://bugs.freedesktop.org/show_bug.cgi?id=108085 */
+	if (IS_GEMINILAKE(dev_priv))
+		return 0;
+
 	if (IS_BROADWELL(dev_priv) || INTEL_GEN(dev_priv) >= 9)
 		return 1;
 
-- 
2.23.0