[PATCH] drm/amdgpu/sdma4:fix sdma engine hang

[Deucher, Alexander]

The spec claims it does and we use it for HDP flush...

Acked-by: Alex Deucher <alexander.deucher at amd.com>

________________________________
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> on behalf of Emily Deng <Emily.Deng at amd.com>
Sent: Friday, March 30, 2018 4:24:08 AM
To: amd-gfx at lists.freedesktop.org
Cc: Deng, Emily
Subject: [PATCH] drm/amdgpu/sdma4:fix sdma engine hang

The sdma doesn't support register write and wait in one command.
Use this will make sdma engine hang.

Signed-off-by: Emily Deng <Emily.Deng at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c | 9 +--------
 1 file changed, 1 insertion(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c b/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c
index 9ac28b2..84d148d 100644
--- a/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/sdma_v4_0.c
@@ -1178,13 +1178,6 @@ static void sdma_v4_0_ring_emit_reg_wait(struct amdgpu_ring *ring, uint32_t reg,
         sdma_v4_0_wait_reg_mem(ring, 0, 0, reg, 0, val, mask, 10);
 }

-static void sdma_v4_0_ring_emit_reg_write_reg_wait(struct amdgpu_ring *ring,
-                                                  uint32_t reg0, uint32_t reg1,
-                                                  uint32_t ref, uint32_t mask)
-{
-       sdma_v4_0_wait_reg_mem(ring, 0, 1, reg0, reg1, ref, mask, 10);
-}
-
 static int sdma_v4_0_early_init(void *handle)
 {
         struct amdgpu_device *adev = (struct amdgpu_device *)handle;
@@ -1626,7 +1619,7 @@ static const struct amdgpu_ring_funcs sdma_v4_0_ring_funcs = {
         .pad_ib = sdma_v4_0_ring_pad_ib,
         .emit_wreg = sdma_v4_0_ring_emit_wreg,
         .emit_reg_wait = sdma_v4_0_ring_emit_reg_wait,
-       .emit_reg_write_reg_wait = sdma_v4_0_ring_emit_reg_write_reg_wait,
+       .emit_reg_write_reg_wait = amdgpu_ring_emit_reg_write_reg_wait_helper,
 };

 static void sdma_v4_0_set_ring_funcs(struct amdgpu_device *adev)
--
2.7.4

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