etnaviv: SINGLE_BUFFER support on GC3000

This patch adds support for the SINGLE_BUFFER feature on GC3000
GPUs, which allows rendering to a single buffer using multiple pixel
pipes.

This feature is always used when it is available, which means that
multi-tiled formats are no longer being used in that case, and all
buffers will be normal (super)tiled. This mimics the behavior of the
blob on GC3000.

- Because the same format can be used to render to and texture from,
  this avoids an extra resolve pass when rendering to texture.

- i.MX6qp includes a PRE which can scan-out directly from tiled formats,
  avoiding untiling overhead.

Signed-off-by: Wladimir J. van der Laan <[email protected]>
Reviewed-by: Christian Gmeiner <[email protected]>

1 files changed, 4 insertions, 2 deletions

diff --git a/src/gallium/drivers/etnaviv/etnaviv_emit.c b/src/gallium/drivers/etnaviv/etnaviv_emit.c
index af74cbb4c52..7ced5fcd11c 100644
--- a/src/gallium/drivers/etnaviv/etnaviv_emit.c
+++ b/src/gallium/drivers/etnaviv/etnaviv_emit.c
@@ -603,10 +603,12 @@ etna_emit_state(struct etna_context *ctx)
    if (unlikely(dirty & (ETNA_DIRTY_STENCIL_REF))) {
       /*014A0*/ EMIT_STATE(PE_STENCIL_CONFIG_EXT, ctx->stencil_ref.PE_STENCIL_CONFIG_EXT);
    }
+   if (unlikely(dirty & (ETNA_DIRTY_BLEND | ETNA_DIRTY_FRAMEBUFFER))) {
+      struct etna_blend_state *blend = etna_blend_state(ctx->blend);
+      /*014A4*/ EMIT_STATE(PE_LOGIC_OP, blend->PE_LOGIC_OP | ctx->framebuffer.PE_LOGIC_OP);
+   }
    if (unlikely(dirty & (ETNA_DIRTY_BLEND))) {
       struct etna_blend_state *blend = etna_blend_state(ctx->blend);
-
-      /*014A4*/ EMIT_STATE(PE_LOGIC_OP, blend->PE_LOGIC_OP);
       for (int x = 0; x < 2; ++x) {
          /*014A8*/ EMIT_STATE(PE_DITHER(x), blend->PE_DITHER[x]);
       }