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radeonsi: fix a GPU hang with tessellation on 2-CU configs 

Only harvested Stoney has 2 CUs. Tested on 2-CU Stoney and Fiji forced
to 2 CUs.

Cc: 17.0 17.1 <mesa-stable@lists.freedesktop.org>
Tested-by: Edmondo Tommasina <edmondo.tommasina@gmail.com>
Tested-by: Dieter Nützel <Dieter@nuetzel-hh.de>
This commit is contained in:
Marek Olšák 2017-05-23 21:52:11 +02:00
parent b9f9bad4eb
commit 6c655cfeb4
1 changed files with 5 additions and 1 deletions
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6
src/gallium/drivers/radeonsi/si_state_draw.c
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@ -169,8 +169,12 @@ static void si_emit_derived_tess_state(struct si_context *sctx,
/* Make sure that the data fits in LDS. This assumes the shaders only
* use LDS for the inputs and outputs.
*
* While CIK can use 64K per threadgroup, there is a hang on Stoney
* with 2 CUs if we use more than 32K. The closed Vulkan driver also
* uses 32K at most on all GCN chips.
*/
hardware_lds_size = sctx->b.chip_class >= CIK ? 65536 : 32768;
hardware_lds_size = 32768;
*num_patches = MIN2(*num_patches, hardware_lds_size / (input_patch_size +
output_patch_size));