[PATCH v4] drm/amdgpu: fix the doorbell missing when in CGPG issue for renoir.

[Deucher, Alexander]

[Public]

Reviewed-by: Alex Deucher <alexander.deucher at amd.com>
________________________________
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> on behalf of Yifan Zhang <yifan1.zhang at amd.com>
Sent: Thursday, July 29, 2021 5:46 AM
To: amd-gfx at lists.freedesktop.org <amd-gfx at lists.freedesktop.org>
Cc: Zhang, Yifan <Yifan1.Zhang at amd.com>
Subject: [PATCH v4] drm/amdgpu: fix the doorbell missing when in CGPG issue for renoir.

If GC has entered CGPG, ringing doorbell > first page doesn't wakeup GC.
Enlarge CP_MEC_DOORBELL_RANGE_UPPER to workaround this issue.

Signed-off-by: Yifan Zhang <yifan1.zhang at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c | 21 ++++++++++++++++++++-
 1 file changed, 20 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
index 03acc777adf7..ab79ca770dcd 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
@@ -1295,6 +1295,16 @@ 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))
@@ -3675,7 +3685,16 @@ 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);
         }

--
2.25.1

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