releases/4.19.50/drm-i915-fbc-disable-framebuffer-compression-on-geminilake.patch

   1 From 396dd8143bdd94bd1c358a228a631c8c895a1126 Mon Sep 17 00:00:00 2001
   2 From: Daniel Drake <drake@endlessm.com>
   3 Date: Tue, 23 Apr 2019 17:28:10 +0800
   4 Subject: drm/i915/fbc: disable framebuffer compression on GeminiLake
   5
   6 From: Daniel Drake <drake@endlessm.com>
   7
   8 commit 396dd8143bdd94bd1c358a228a631c8c895a1126 upstream.
   9
  10 On many (all?) the Gemini Lake systems we work with, there is frequent
  11 momentary graphical corruption at the top of the screen, and it seems
  12 that disabling framebuffer compression can avoid this.
  13
  14 The ticket was reported 6 months ago and has already affected a
  15 multitude of users, without any real progress being made. So, lets
  16 disable framebuffer compression on GeminiLake until a solution is found.
  17
  18 Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=108085
  19 Fixes: fd7d6c5c8f3e ("drm/i915: enable FBC on gen9+ too")
  20 Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
  21 Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
  22 Cc: Jani Nikula <jani.nikula@linux.intel.com>
  23 Cc: <stable@vger.kernel.org> # v4.11+
  24 Reviewed-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
  25 Signed-off-by: Daniel Drake <drake@endlessm.com>
  26 Signed-off-by: Jian-Hong Pan <jian-hong@endlessm.com>
  27 Signed-off-by: Jani Nikula <jani.nikula@intel.com>
  28 Link: https://patchwork.freedesktop.org/patch/msgid/20190423092810.28359-1-jian-hong@endlessm.com
  29 (cherry picked from commit 1d25724b41fad7eeb2c3058a5c8190d6ece73e08)
  30 Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
  31 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  32
  33 ---
  34  drivers/gpu/drm/i915/intel_fbc.c |    4 ++++
  35  1 file changed, 4 insertions(+)
  36
  37 --- a/drivers/gpu/drm/i915/intel_fbc.c
  38 +++ b/drivers/gpu/drm/i915/intel_fbc.c
  39 @@ -1267,6 +1267,10 @@ static int intel_sanitize_fbc_option(str
  40         if (!HAS_FBC(dev_priv))
  41                 return 0;
  42
  43 +       /* https://bugs.freedesktop.org/show_bug.cgi?id=108085 */
  44 +       if (IS_GEMINILAKE(dev_priv))
  45 +               return 0;
  46 +
  47         if (IS_BROADWELL(dev_priv) || INTEL_GEN(dev_priv) >= 9)
  48                 return 1;
  49