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

[Zhang, Hawking]

[AMD Official Use Only - AMD Internal Distribution Only]

Series is

Reviewed-by: Hawking Zhang <Hawking.Zhang at amd.com>

Regards,
Hawking
-----Original Message-----
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> On Behalf Of Jane Jian
Sent: Tuesday, July 16, 2024 15:59
To: Lazar, Lijo <Lijo.Lazar at amd.com>; Chang, HaiJun <HaiJun.Chang at amd.com>; Zhao, Victor <Victor.Zhao at amd.com>
Cc: amd-gfx at lists.freedesktop.org; Lazar, Lijo <Lijo.Lazar at amd.com>; Jian, Jane <Jane.Jian at amd.com>
Subject: [PATCH 1/3] drm/amdgpu: Add empty HDP flush function to JPEG v4.0.3

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.

This change is necessary for JPEG v4.0.3, no need for backward compatibility

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 | 8 ++++++++
 1 file changed, 8 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..30a143ab592d 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 +621,13 @@ 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) {
+       /* JPEG engine access for HDP flush doesn't work when RRMT is enabled.
+        * This is a workaround to avoid any HDP flush through JPEG ring.
+        */
+}
+
 /**
  * jpeg_v4_0_3_dec_ring_set_wptr - set write pointer
  *
@@ -1072,6 +1079,7 @@ 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