[Bug 94406] Vulkan: fast clear isn't working on skl

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94406

            Bug ID: 94406
           Summary: Vulkan: fast clear isn't working on skl
           Product: Mesa
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Drivers/Vulkan/intel
          Assignee: intel-3d-bugs at lists.freedesktop.org
          Reporter: notasas at gmail.com
        QA Contact: intel-3d-bugs at lists.freedesktop.org
                CC: notasas at gmail.com

Created attachment 122118
  --> https://bugs.freedesktop.org/attachment.cgi?id=122118&action=edit
bad clear

On the vulkan branch fast clear isn't working in normal GL, works fine on
master. I couldn't properly bisect because GL isn't working at all in the early
history of the vulkan branch on skl.

>From what I was able to determine the problem shows up after master commit
8a0c85b "i965/gen9: Enable rep clears on gen9" gets merged into vulkan branch.
If I checkout at this commit in master branch it works fine, but at it's merge
point to vulkan branch (958fc04) there is already a problem.

This hack seems to help:
diff --git a/src/mesa/drivers/dri/i965/brw_clear.c
b/src/mesa/drivers/dri/i965/brw_clear.c
index 841ba5d..dfd08de 100644
--- a/src/mesa/drivers/dri/i965/brw_clear.c
+++ b/src/mesa/drivers/dri/i965/brw_clear.c
@@ -240,7 +240,7 @@ brw_clear(struct gl_context *ctx, GLbitfield mask)
    }

    /* Clear color buffers with fast clear or at least rep16 writes. */
-   if (brw->gen >= 6 && (mask & BUFFER_BITS_COLOR)) {
+   if (0) { //brw->gen >= 6 && (mask & BUFFER_BITS_COLOR)) {
       if (brw_meta_fast_clear(brw, fb, mask, partial_clear)) {
          debug_mask("blorp color", mask & BUFFER_BITS_COLOR);
          mask &= ~BUFFER_BITS_COLOR;

Mesa 11.3.0-devel (git-81f30e2)
Intel(R) HD Graphics 530 (Skylake GT2) 
kernel: 4.5.0-rc5+

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