drm/radeon/kms: properly compute group_size on 6xx/7xx

Needed for tiled surfaces.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Cc: stable@kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>

2 files changed, 10 insertions, 6 deletions

diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c
index 83ba9644dcb..33952a12f0a 100644
--- a/drivers/gpu/drm/radeon/r600.c
+++ b/drivers/gpu/drm/radeon/r600.c
@@ -1608,8 +1608,11 @@ void r600_gpu_init(struct radeon_device *rdev)
         rdev->config.r600.tiling_npipes = rdev->config.r600.max_tile_pipes;
         rdev->config.r600.tiling_nbanks = 4 << ((ramcfg & NOOFBANK_MASK) >> NOOFBANK_SHIFT);
         tiling_config |= BANK_TILING((ramcfg & NOOFBANK_MASK) >> NOOFBANK_SHIFT);
-        tiling_config |= GROUP_SIZE(0);
-        rdev->config.r600.tiling_group_size = 256;
+        tiling_config |= GROUP_SIZE((ramcfg & BURSTLENGTH_MASK) >> BURSTLENGTH_SHIFT);
+        if ((ramcfg & BURSTLENGTH_MASK) >> BURSTLENGTH_SHIFT)
+                rdev->config.r600.tiling_group_size = 512;
+        else
+                rdev->config.r600.tiling_group_size = 256;
         tmp = (ramcfg & NOOFROWS_MASK) >> NOOFROWS_SHIFT;
         if (tmp > 3) {
                 tiling_config |= ROW_TILING(3);
diff --git a/drivers/gpu/drm/radeon/rv770.c b/drivers/gpu/drm/radeon/rv770.c
index ab83f688263..245374e2b77 100644
--- a/drivers/gpu/drm/radeon/rv770.c
+++ b/drivers/gpu/drm/radeon/rv770.c
@@ -644,10 +644,11 @@ static void rv770_gpu_init(struct radeon_device *rdev)
         else
                 gb_tiling_config |= BANK_TILING((mc_arb_ramcfg & NOOFBANK_MASK) >> NOOFBANK_SHIFT);
         rdev->config.rv770.tiling_nbanks = 4 << ((gb_tiling_config >> 4) & 0x3);
-
-        gb_tiling_config |= GROUP_SIZE(0);
-        rdev->config.rv770.tiling_group_size = 256;
-
+        gb_tiling_config |= GROUP_SIZE((mc_arb_ramcfg & BURSTLENGTH_MASK) >> BURSTLENGTH_SHIFT);
+        if ((mc_arb_ramcfg & BURSTLENGTH_MASK) >> BURSTLENGTH_SHIFT)
+                rdev->config.rv770.tiling_group_size = 512;
+        else
+                rdev->config.rv770.tiling_group_size = 256;
         if (((mc_arb_ramcfg & NOOFROWS_MASK) >> NOOFROWS_SHIFT) > 3) {
                 gb_tiling_config |= ROW_TILING(3);
                 gb_tiling_config |= SAMPLE_SPLIT(3);