Mesa (10.0): i965/hsw: Apply non-msrt fast color clear w/a to all HSW GTs

[Ian Romanick]

Module: Mesa
Branch: 10.0
Commit: edca52e6e7169f490b8c1ee4c6103d97c0409f3c
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=edca52e6e7169f490b8c1ee4c6103d97c0409f3c

Author: Chad Versace <chad.versace at linux.intel.com>
Date:   Tue Nov 26 17:04:24 2013 -0800

i965/hsw: Apply non-msrt fast color clear w/a to all HSW GTs

Pre-patch, the workaround was applied to only HSW GT3. However, the
workaround also fixes render corruption on the HSW GT1 Chromebook,
codenamed Falco.

Also, update the BSpec quote that discusses the workaround to reflect
the latest BSpec.

The BSpec states that the workaround is required for Ivybridge and
Baytrail as well as Haswell. But, we apply the workaround to only
Haswell because (a) we suspect that is the only hardware where it is
actually required and (b) we haven't yet validated the workaround for
the other hardware.

CC: "9.2, 10.0" <mesa-stable at lists.freedesktop.org>
CC: Anuj Phogat <anuj.phogat at gmail.com>
OTC-Tracker: CHRMOS-812
Reviewed-by: Paul Berry <stereotype441 at gmail.com>
Reviewed-by: Kenneth Graunke <kenneth at whitecape.org>
Signed-off-by: Chad Versace <chad.versace at linux.intel.com>
(cherry picked from commit 8b659cef3a244b1acdbbca0beb704a66b6bc2fbc)

---

 src/mesa/drivers/dri/i965/brw_blorp_clear.cpp |   18 ++++++++++++------
 1 files changed, 12 insertions(+), 6 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_blorp_clear.cpp b/src/mesa/drivers/dri/i965/brw_blorp_clear.cpp
index 02ec273..3f096b5 100644
--- a/src/mesa/drivers/dri/i965/brw_blorp_clear.cpp
+++ b/src/mesa/drivers/dri/i965/brw_blorp_clear.cpp
@@ -265,13 +265,19 @@ brw_blorp_clear_params::brw_blorp_clear_params(struct brw_context *brw,
       x_align *= 16;
       y_align *= 32;
 
-      if (brw->is_haswell && brw->gt == 3) {
+      if (brw->is_haswell) {
          /* From BSpec: 3D-Media-GPGPU Engine > 3D Pipeline > Pixel > Pixel
-          * Backend > MCS Buffer for Render Target(s) [DevIVB+]:
-          * [DevHSW:GT3]: Clear rectangle must be aligned to two times the
-          * number of pixels in the table shown below...
-          * x_align, y_align values computed above are the relevant entries
-          * in the referred table.
+          * Backend > MCS Buffer for Render Target(s) [DevIVB+] > Table "Color
+          * Clear of Non-MultiSampled Render Target Restrictions":
+          *
+          *   [IVB, VLVT, HSW]: Clear rectangle must be aligned to two times
+          *   the number of pixels in the table shown below...  x_align,
+          *   y_align values computed above are the relevant entries in the
+          *   referred table.
+          *
+          * We apply the workaround to only Haswell because (a) we suspect that
+          * is the only hardware where it is actually required and (b) we
+          * haven't yet validated the workaround for the other hardware.
           */
          x0 = ROUND_DOWN_TO(x0, 2 * x_align);
          y0 = ROUND_DOWN_TO(y0, 2 * y_align);