From: Likun Gao <Likun.Gao@amd.com>
Date: Wed, 6 Aug 2025 02:28:18 +0000 (+0800)
Subject: drm/amdgpu: disable burst for gfx v12_1
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a2a7e75020cbff0af16abae74a90bdff2834a191;p=thirdparty%2Fkernel%2Flinux.git

drm/amdgpu: disable burst for gfx v12_1

Disable burst in GL1A and GLARBA for gfx v12_1.

Signed-off-by: Likun Gao <Likun.Gao@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v12_1.c b/drivers/gpu/drm/amd/amdgpu/gfx_v12_1.c
index 6777319234969..c2b9311831646 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v12_1.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v12_1.c
@@ -2637,11 +2637,19 @@ static void gfx_v12_1_xcc_enable_atomics(struct amdgpu_device *adev,
 	WREG32_SOC15(GC, GET_INST(GC, xcc_id), regTCP_UTCL0_CNTL1, data);
 }
 
+static void gfx_v12_1_xcc_disable_burst(struct amdgpu_device *adev,
+					int xcc_id)
+{
+	WREG32_SOC15(GC, GET_INST(GC, xcc_id), regGL1_DRAM_BURST_CTRL, 0xf);
+	WREG32_SOC15(GC, GET_INST(GC, xcc_id), regGLARB_DRAM_BURST_CTRL, 0xf);
+}
+
 static void gfx_v12_1_init_golden_registers(struct amdgpu_device *adev)
 {
 	int i;
 
 	for (i = 0; i < NUM_XCC(adev->gfx.xcc_mask); i++) {
+		gfx_v12_1_xcc_disable_burst(adev, i);
 		gfx_v12_1_xcc_enable_atomics(adev, i);
 		gfx_v12_1_xcc_setup_tcp_thrashing_ctrl(adev, i);
 	}