drm/i915/fbc: disable framebuffer compression on GeminiLake

BugLink: https://bugs.launchpad.net/bugs/1838700
commit 396dd8143bdd94bd1c358a228a631c8c895a1126 upstream.

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@intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: <stable@vger.kernel.org> # v4.11+
Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Signed-off-by: Daniel Drake <drake@endlessm.com>
Signed-off-by: Jian-Hong Pan <jian-hong@endlessm.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190423092810.28359-1-jian-hong@endlessm.com
(cherry picked from commit 1d25724b41fad7eeb2c3058a5c8190d6ece73e08)
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/drivers/gpu/drm/i915/intel_fbc.c b/drivers/gpu/drm/i915/intel_fbc.c
index 1a0f5e0c8d1056801074732bc2243c48632d05e2..44db444bca4cb0bbb9ff686e0147181cfc0962e3 100644 (file)
--- a/drivers/gpu/drm/i915/intel_fbc.c
+++ b/drivers/gpu/drm/i915/intel_fbc.c
@@ -1319,6 +1319,10 @@ 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;