Comment # 50
on bug 60802
from Anthony Waters
I believe I have the source of the bug, it appears that there is a special case
for Caymen GPUs that isn't handled in the DMA code path. In evergreen_state.c
within the method evergreen_create_sampler_view_custom there is the chunk of
code
/* 128 bit formats require tile type = 1 */
if (rscreen->chip_class == CAYMAN) {
if (util_format_get_blocksize(pipe_format) >= 16)
non_disp_tiling = 1;
}
however, within evergreen_dma_copy_tile in the same source file no such code
exists. I tested whether this was the case or not by placing the lines of code
if (util_format_get_blocksize(dst->format) >= 16) {
printf("Caymen non disp tiling skipping dma tile\n");
return FALSE;
}
before the call to evergreen_dma_copy_tile in evergreen_dma_blit, and the
corruption no longer appeared. (having this checks skips the DMA path for this
case and goes through the normal path, which would be
evergreen_create_sampler_view_custom I believe)
I'm not sure which bits in the DMA packet control this setting.
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