[Mesa-dev] [PATCH 1/2] r600g: fall back to blitter for compressed textures on cayman (v2)

[alexdeucher at gmail.com]

From: Alex Deucher <alexander.deucher at amd.com>

The DMA block seems to have alignment issues with large
block sizes.  Use the blitter for these surfaces.

v2: cayman/TN only

Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=60802

Note: this is a candidate for the 9.1 branch.

Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 src/gallium/drivers/r600/evergreen_state.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/src/gallium/drivers/r600/evergreen_state.c b/src/gallium/drivers/r600/evergreen_state.c
index 2bdefb0..b40ed01 100644
--- a/src/gallium/drivers/r600/evergreen_state.c
+++ b/src/gallium/drivers/r600/evergreen_state.c
@@ -3674,6 +3674,15 @@ boolean evergreen_dma_blit(struct pipe_context *ctx,
 		return FALSE;
 	}
 
+	/* The DMA block on cayman seems to have alignment issues
+	 * with large block sizes.  Needs more investigation.
+	 */
+	if ((rctx->chip_class == CAYMAN) &&
+	    (src_mode != dst_mode) &&
+	    (util_format_get_blocksize(src->format) >= 16)) {
+		return FALSE;
+	}
+
 	if (src_mode == dst_mode) {
 		uint64_t dst_offset, src_offset;
 		/* simple dma blit would do NOTE code here assume :
-- 
1.7.7.5