drm/radeon/kms: setup mc chremap properly on r7xx/evergreen
Should improve performance slightly and possibly fix some
issues.
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
index 4dc5b47..728358e 100644
--- a/drivers/gpu/drm/radeon/evergreen.c
+++ b/drivers/gpu/drm/radeon/evergreen.c
@@ -1382,6 +1382,42 @@
return backend_map;
}
+static void evergreen_program_channel_remap(struct radeon_device *rdev)
+{
+ u32 tcp_chan_steer_lo, tcp_chan_steer_hi, mc_shared_chremap, tmp;
+
+ tmp = RREG32(MC_SHARED_CHMAP);
+ switch ((tmp & NOOFCHAN_MASK) >> NOOFCHAN_SHIFT) {
+ case 0:
+ case 1:
+ case 2:
+ case 3:
+ default:
+ /* default mapping */
+ mc_shared_chremap = 0x00fac688;
+ break;
+ }
+
+ switch (rdev->family) {
+ case CHIP_HEMLOCK:
+ case CHIP_CYPRESS:
+ tcp_chan_steer_lo = 0x54763210;
+ tcp_chan_steer_hi = 0x0000ba98;
+ break;
+ case CHIP_JUNIPER:
+ case CHIP_REDWOOD:
+ case CHIP_CEDAR:
+ default:
+ tcp_chan_steer_lo = 0x76543210;
+ tcp_chan_steer_hi = 0x0000ba98;
+ break;
+ }
+
+ WREG32(TCP_CHAN_STEER_LO, tcp_chan_steer_lo);
+ WREG32(TCP_CHAN_STEER_HI, tcp_chan_steer_hi);
+ WREG32(MC_SHARED_CHREMAP, mc_shared_chremap);
+}
+
static void evergreen_gpu_init(struct radeon_device *rdev)
{
u32 cc_rb_backend_disable = 0;
@@ -1685,6 +1721,8 @@
WREG32(DMIF_ADDR_CONFIG, gb_addr_config);
WREG32(HDP_ADDR_CONFIG, gb_addr_config);
+ evergreen_program_channel_remap(rdev);
+
num_shader_engines = ((RREG32(GB_ADDR_CONFIG) & NUM_SHADER_ENGINES(3)) >> 12) + 1;
grbm_gfx_index = INSTANCE_BROADCAST_WRITES;