From: Hawking Zhang <Hawking.Zhang@amd.com>
Date: Tue, 22 Dec 2020 07:55:35 +0000 (+0800)
Subject: drm/amdgpu: bypass hdp read cache invalidation for aldebaran (v2)
X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=d02692ae0d538598e9ef970dabfd29620055b18b;p=linux.git

drm/amdgpu: bypass hdp read cache invalidation for aldebaran (v2)

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@amd.com>
Reviewed-by: Feifei Xu <Feifei.Xu@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/amd/amdgpu/hdp_v4_0.c b/drivers/gpu/drm/amd/amdgpu/hdp_v4_0.c
index e46621fed5b95..edbd35d293ebf 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