[Bug 55500] [sna gen4 w/a] corrupt rendering (including wrong rendering of characters and flickering on redraw)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=55500

--- Comment #149 from Edward Sheldrake <ejsheldrake at gmail.com> ---
(In reply to comment #148)
> Worth trying just:
> 
> diff --git a/src/sna/gen4_render.c b/src/sna/gen4_render.c
> index 637137e..dc80de3 100644
> --- a/src/sna/gen4_render.c
> +++ b/src/sna/gen4_render.c
> @@ -660,9 +660,11 @@ inline static int gen4_get_rectangles(struct sna *sna,
>                 if (rem <= 0) {
>                         if (sna->render.vertex_offset) {
>                                 gen4_vertex_flush(sna);
> -                               if (gen4_magic_ca_pass(sna, op))
> +                               if (gen4_magic_ca_pass(sna, op)) {
> +                                       OUT_BATCH(MI_FLUSH |
> MI_INHIBIT_RENDER_CACHE_FLUSH);
>                                         gen4_emit_pipelined_pointers(sna,
> op, op->op,
>                                                                     
> op->u.gen4.wm_kernel);
> +                               }
>                         }
>                         OUT_BATCH(MI_FLUSH | MI_INHIBIT_RENDER_CACHE_FLUSH);
>                         rem = MAX_FLUSH_VERTICES;
> 
> if you are happy that it reproduces reliably.

This change did not fully solve the problem. One text file in gedit displayed
as blank initially for a bit, although things then seemed fine. But the freeze
with "[drm] stuck on render ring" happened during a second run of gtkperf -
while the "GtkDrawingArea - Text" test was running.

But I didn't spot any corrupted characters while running 2.99.907 with
MAX_FLUSH_VERTICES set back to 6 - although I hadn't been running that for very
long, and I only see a single garbled char occasionally, and I think they only
appear in Firefox.

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