[PATCH 1/3] drm/amdgpu: Add empty HDP flush function to JPEG v4.0.3

[Jane Jian]

From: Lijo Lazar <lijo.lazar at amd.com>

JPEG v4.0.3 doesn't support HDP flush when RRMT is enabled. Instead,
mmsch fw will do the flush.

Signed-off-by: Lijo Lazar <lijo.lazar at amd.com>
Signed-off-by: Jane Jian <Jane.Jian at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/jpeg_v4_0_3.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/jpeg_v4_0_3.c b/drivers/gpu/drm/amd/amdgpu/jpeg_v4_0_3.c
index 04d8966423de..ea601047dab0 100644
--- a/drivers/gpu/drm/amd/amdgpu/jpeg_v4_0_3.c
+++ b/drivers/gpu/drm/amd/amdgpu/jpeg_v4_0_3.c
@@ -621,6 +621,14 @@ static uint64_t jpeg_v4_0_3_dec_ring_get_wptr(struct amdgpu_ring *ring)
 			ring->pipe ? (0x40 * ring->pipe - 0xc80) : 0);
 }
 
+static void jpeg_v4_0_3_ring_emit_hdp_flush(struct amdgpu_ring *ring)
+{
+	/* VCN engine access for HDP flush doesn't work when RRMT is enabled.
+	 * This is a workaround to avoid any HDP flush through VCN ring. Instead
+	 * HDP flush will be done by driver while submitting doorbell.
+	 */
+}
+
 /**
  * jpeg_v4_0_3_dec_ring_set_wptr - set write pointer
  *
@@ -1072,6 +1080,7 @@ static const struct amdgpu_ring_funcs jpeg_v4_0_3_dec_ring_vm_funcs = {
 	.emit_ib = jpeg_v4_0_3_dec_ring_emit_ib,
 	.emit_fence = jpeg_v4_0_3_dec_ring_emit_fence,
 	.emit_vm_flush = jpeg_v4_0_3_dec_ring_emit_vm_flush,
+	.emit_hdp_flush = jpeg_v4_0_3_ring_emit_hdp_flush,
 	.test_ring = amdgpu_jpeg_dec_ring_test_ring,
 	.test_ib = amdgpu_jpeg_dec_ring_test_ib,
 	.insert_nop = jpeg_v4_0_3_dec_ring_nop,
-- 
2.34.1