drm/amdgpu: fix the doorbell missing when in CGPG issue for renoir.

From Yifan Zhang
7525f2e4de0069983497a9d3eab1ca9813ae1b4b in linux 5.10.y/5.10.61
1c0539a6fc8a4a4b77278e35d763073890de96b9 in mainline linux

diff --git a/sys/dev/pci/drm/amd/amdgpu/gfx_v9_0.c b/sys/dev/pci/drm/amd/amdgpu/gfx_v9_0.c
index 25104e0..2c10b17 100644 (file)
--- a/sys/dev/pci/drm/amd/amdgpu/gfx_v9_0.c
+++ b/sys/dev/pci/drm/amd/amdgpu/gfx_v9_0.c
@@ -1271,6 +1271,16 @@ static bool is_raven_kicker(struct amdgpu_device *adev)
                return false;
 }
 
+static bool check_if_enlarge_doorbell_range(struct amdgpu_device *adev)
+{
+       if ((adev->asic_type == CHIP_RENOIR) &&
+           (adev->gfx.me_fw_version >= 0x000000a5) &&
+           (adev->gfx.me_feature_version >= 52))
+               return true;
+       else
+               return false;
+}
+
 static void gfx_v9_0_check_if_need_gfxoff(struct amdgpu_device *adev)
 {
        if (gfx_v9_0_should_disable_gfxoff(adev->pdev))
@@ -3619,7 +3629,16 @@ static int gfx_v9_0_kiq_init_register(struct amdgpu_ring *ring)
        if (ring->use_doorbell) {
                WREG32_SOC15(GC, 0, mmCP_MEC_DOORBELL_RANGE_LOWER,
                                        (adev->doorbell_index.kiq * 2) << 2);
-               WREG32_SOC15(GC, 0, mmCP_MEC_DOORBELL_RANGE_UPPER,
+               /* If GC has entered CGPG, ringing doorbell > first page
+                * doesn't wakeup GC. Enlarge CP_MEC_DOORBELL_RANGE_UPPER to
+                * workaround this issue. And this change has to align with firmware
+                * update.
+                */
+               if (check_if_enlarge_doorbell_range(adev))
+                       WREG32_SOC15(GC, 0, mmCP_MEC_DOORBELL_RANGE_UPPER,
+                                       (adev->doorbell.size - 4));
+               else
+                       WREG32_SOC15(GC, 0, mmCP_MEC_DOORBELL_RANGE_UPPER,
                                        (adev->doorbell_index.userqueue_end * 2) << 2);
        }