[PATCH] drm/amdgpu/vce1: Fix checking whether VCE1 is idle

["Timur Kristóf" <timur.kristof@gmail.com>]

It turns out that the VCE_STATUS register bits that we
used to check whether VCE1 is idle are actually not useful:
VCE_STATUS.JOB_BUSY doesn't exist until VCE3
VCE_STATUS.UENC_BUSY seems to be stuck high on Cape Verde

Instead, do the following:
Check that the read and write pointer matches for each ring.
Check VCE_STATUS.VCPU_REPORT bits to check busy status.
Finally, also check SRBM_STATUS2.VCE_BUSY just in case,
although this one seems bogus on VCE1.

Fixes: d4a640d4b9f3 ("drm/amdgpu/vce1: Implement VCE1 IP block (v2)")
Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
---
 drivers/gpu/drm/amd/amdgpu/vce_v1_0.c         | 25 ++++++++++++++-----
 .../include/asic_reg/vce/vce_1_0_sh_mask.h    |  2 --
 2 files changed, 19 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/vce_v1_0.c b/drivers/gpu/drm/amd/amdgpu/vce_v1_0.c
index b1428f5bbc81..38e21d1a3ebb 100644
--- a/drivers/gpu/drm/amd/amdgpu/vce_v1_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/vce_v1_0.c
@@ -47,6 +47,9 @@
 #define VCE_V1_0_STACK_SIZE	(64 * 1024)
 #define VCE_V1_0_DATA_SIZE	(ALIGN(7808 * (AMDGPU_MAX_VCE_HANDLES + 1), VCE_V1_0_ALIGNMENT))
 #define VCE_STATUS_VCPU_REPORT_FW_LOADED_MASK	0x02
+#define VCE_STATUS_VCPU_REPORT_AUTO_BUSY_MASK   0x08
+#define VCE_STATUS_VCPU_REPORT_RB0_BUSY_MASK    0x10
+#define VCE_STATUS_VCPU_REPORT_RB1_BUSY_MASK    0x20
 
 static void vce_v1_0_set_ring_funcs(struct amdgpu_device *adev);
 static void vce_v1_0_set_irq_funcs(struct amdgpu_device *adev);
@@ -349,19 +352,29 @@ static int vce_v1_0_mc_resume(struct amdgpu_device *adev)
  *
  * @ip_block: amdgpu_ip_block pointer
  *
- * Check whether VCE is busy according to VCE_STATUS.
+ * Check whether VCE is busy according to VCE_STATUS
+ * and whether the ring pointers match.
+ *
  * Also check whether the SRBM thinks VCE is busy, although
- * SRBM_STATUS.VCE_BUSY seems to be bogus because it
+ * SRBM_STATUS2.VCE_BUSY seems to be bogus because it
  * appears to mirror the VCE_STATUS.VCPU_REPORT_FW_LOADED bit.
  */
 static bool vce_v1_0_is_idle(struct amdgpu_ip_block *ip_block)
 {
 	struct amdgpu_device *adev = ip_block->adev;
-	bool busy =
-		(RREG32(mmVCE_STATUS) & (VCE_STATUS__JOB_BUSY_MASK | VCE_STATUS__UENC_BUSY_MASK)) ||
-		(RREG32(mmSRBM_STATUS2) & SRBM_STATUS2__VCE_BUSY_MASK);
 
-	return !busy;
+	/* Check whether the rings are busy. */
+	if (RREG32(mmVCE_RB_RPTR) != RREG32(mmVCE_RB_WPTR) ||
+	    RREG32(mmVCE_RB_RPTR2) != RREG32(mmVCE_RB_WPTR2))
+		return false;
+
+	/* Check whether the VCPU is busy. */
+	if (RREG32(mmVCE_STATUS) & (VCE_STATUS_VCPU_REPORT_AUTO_BUSY_MASK |
+				    VCE_STATUS_VCPU_REPORT_RB0_BUSY_MASK |
+				    VCE_STATUS_VCPU_REPORT_RB1_BUSY_MASK))
+		return false;
+
+	return !(RREG32(mmSRBM_STATUS2) & SRBM_STATUS2__VCE_BUSY_MASK);
 }
 
 static int vce_v1_0_wait_for_idle(struct amdgpu_ip_block *ip_block)
diff --git a/drivers/gpu/drm/amd/include/asic_reg/vce/vce_1_0_sh_mask.h b/drivers/gpu/drm/amd/include/asic_reg/vce/vce_1_0_sh_mask.h
index 1f82d6f5abde..13c15c2138b3 100644
--- a/drivers/gpu/drm/amd/include/asic_reg/vce/vce_1_0_sh_mask.h
+++ b/drivers/gpu/drm/amd/include/asic_reg/vce/vce_1_0_sh_mask.h
@@ -63,8 +63,6 @@
 #define VCE_SOFT_RESET__ECPU_SOFT_RESET__SHIFT 0x00000000
 #define VCE_SOFT_RESET__FME_SOFT_RESET_MASK 0x00000004L
 #define VCE_SOFT_RESET__FME_SOFT_RESET__SHIFT 0x00000002
-#define VCE_STATUS__JOB_BUSY_MASK 0x00000001L
-#define VCE_STATUS__JOB_BUSY__SHIFT 0x00000000
 #define VCE_STATUS__UENC_BUSY_MASK 0x00000100L
 #define VCE_STATUS__UENC_BUSY__SHIFT 0x00000008
 #define VCE_STATUS__VCPU_REPORT_MASK 0x000000feL
-- 
2.55.0