drm/amdgpu: Fix bugs in setting CP RB/MEC DOORBELL_RANGE registers

CP_RB_DOORBELL_RANGE_LOWER/UPPER and CP_MEC_DOORBELL_RANGE_LOWER/UPPER
are used for waking up an idle scheduler and for power gating support.
Usually the first few doorbells in pci doorbell bar are used for RB
and all leftover for MEC. This patch fixes the incorrect settings.

Theoretically, gfx ring doorbells should come before all MEC doorbells
to be consistent with the design. However, since the doorbell
allocations are agreed by all and we are not free to change them, also
considering the kernel MEC ring doorbells which are before gfx ring
doorbells are not used often, we compromise by leaving the doorbell
allocations unchanged.

Signed-off-by: Yong Zhao <Yong.Zhao@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 15 insertions, 4 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
index b8e50a34bdb3..41cf9d0224d9 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v8_0.c
@@ -4223,8 +4223,8 @@ static void gfx_v8_0_set_cpg_door_bell(struct amdgpu_device *adev, struct amdgpu
                                         adev->doorbell_index.gfx_ring0);
         WREG32(mmCP_RB_DOORBELL_RANGE_LOWER, tmp);
 
-        WREG32(mmCP_RB_DOORBELL_RANGE_UPPER,
-                CP_RB_DOORBELL_RANGE_UPPER__DOORBELL_RANGE_UPPER_MASK);
+        /* There is only one GFX queue */
+        WREG32(mmCP_RB_DOORBELL_RANGE_UPPER, tmp);
 }
 
 static int gfx_v8_0_cp_gfx_resume(struct amdgpu_device *adev)
@@ -4646,8 +4646,19 @@ static int gfx_v8_0_kcq_init_queue(struct amdgpu_ring *ring)
 static void gfx_v8_0_set_mec_doorbell_range(struct amdgpu_device *adev)
 {
         if (adev->asic_type > CHIP_TONGA) {
-                WREG32(mmCP_MEC_DOORBELL_RANGE_LOWER, adev->doorbell_index.kiq << 2);
-                WREG32(mmCP_MEC_DOORBELL_RANGE_UPPER, adev->doorbell_index.mec_ring7 << 2);
+                /* The first few doorbells in pci doorbell bar are for GFX RB
+                 * rings and all the leftover for MEC.
+                 * So CP_MEC_DOORBELL_RANGE_LOWER should be set one index after
+                 * CP_RB_DOORBELL_RANGE_UPPER, as we assume there is only one
+                 * GFX RB rings.
+                 */
+                u32 tmp = REG_SET_FIELD(0, CP_MEC_DOORBELL_RANGE_LOWER,
+                                DOORBELL_RANGE_LOWER,
+                                adev->gfx.gfx_ring[0].doorbell_index + 1);
+
+                WREG32(mmCP_MEC_DOORBELL_RANGE_LOWER, tmp);
+                WREG32(mmCP_MEC_DOORBELL_RANGE_UPPER,
+                                CP_MEC_DOORBELL_RANGE_UPPER__DOORBELL_RANGE_UPPER_MASK);
         }
         /* enable doorbells */
         WREG32_FIELD(CP_PQ_STATUS, DOORBELL_ENABLE, 1);