[PATCH 100/159] drm/amdgpu: bypass hdp read cache invalidation for aldebaran (v2)

[Alex Deucher]

From: Hawking Zhang <Hawking.Zhang at amd.com>

hdp read cache is removed in aldebaran. don't issue
an mmio write or write data packet to hardware.

v2: rebase

Signed-off-by: Hawking Zhang <Hawking.Zhang at amd.com>
Reviewed-by: Feifei Xu <Feifei.Xu at amd.com>
Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/hdp_v4_0.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/hdp_v4_0.c b/drivers/gpu/drm/amd/amdgpu/hdp_v4_0.c
index e46621fed5b9..edbd35d293eb 100644
--- a/drivers/gpu/drm/amd/amdgpu/hdp_v4_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/hdp_v4_0.c
@@ -49,6 +49,9 @@ static void hdp_v4_0_flush_hdp(struct amdgpu_device *adev,
 static void hdp_v4_0_invalidate_hdp(struct amdgpu_device *adev,
 				    struct amdgpu_ring *ring)
 {
+	if (adev->asic_type == CHIP_ALDEBARAN)
+		return;
+
 	if (!ring || !ring->funcs->emit_wreg)
 		WREG32_SOC15_NO_KIQ(HDP, 0, mmHDP_READ_CACHE_INVALIDATE, 1);
 	else
-- 
2.29.2