[PATCH 6.18 186/333] drm/amd: Disable MES LR compute W/A

Greg Kroah-Hartman
2026-03-17T17:18:24Z

From: Mario Limonciello <mario.limonciello@amd.com>

commit 6b0d812971370c64b837a2db4275410f478272fe upstream.

A workaround was introduced in commit 1fb710793ce2 ("drm/amdgpu: Enable
MES lr_compute_wa by default") to help with some hangs observed in gfx1151.

This WA didn't fully fix the issue. It was actually fixed by adjusting
the VGPR size to the correct value that matched the hardware in commit
b42f3bf9536c ("drm/amdkfd: bump minimum vgpr size for gfx1151").

There are reports of instability on other products with newer GC microcode
versions, and I believe they're caused by this workaround. As we don't
need the workaround any more, remove it.

Fixes: b42f3bf9536c ("drm/amdkfd: bump minimum vgpr size for gfx1151")
Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
(cherry picked from commit 9973e64bd6ee7642860a6f3b6958cbf14e89cabd)
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/gpu/drm/amd/amdgpu/mes_v11_0.c | 5 -----
drivers/gpu/drm/amd/amdgpu/mes_v12_0.c | 5 -----
2 files changed, 10 deletions(-)

--- a/drivers/gpu/drm/amd/amdgpu/mes_v11_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/mes_v11_0.c
@@ -714,11 +714,6 @@ static int mes_v11_0_set_hw_resources(st
mes_set_hw_res_pkt.enable_reg_active_poll = 1;
mes_set_hw_res_pkt.enable_level_process_quantum_check = 1;
mes_set_hw_res_pkt.oversubscription_timer = 50;
- if ((mes->adev->mes.sched_version & AMDGPU_MES_VERSION_MASK) >= 0x7f)
- mes_set_hw_res_pkt.enable_lr_compute_wa = 1;
- else
- dev_info_once(mes->adev->dev,
- "MES FW version must be >= 0x7f to enable LR compute workaround.\n");

if (amdgpu_mes_log_enable) {
mes_set_hw_res_pkt.enable_mes_event_int_logging = 1;
--- a/drivers/gpu/drm/amd/amdgpu/mes_v12_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/mes_v12_0.c
@@ -775,11 +775,6 @@ static int mes_v12_0_set_hw_resources(st
mes_set_hw_res_pkt.use_different_vmid_compute = 1;
mes_set_hw_res_pkt.enable_reg_active_poll = 1;
mes_set_hw_res_pkt.enable_level_process_quantum_check = 1;
- if ((mes->adev->mes.sched_version & AMDGPU_MES_VERSION_MASK) >= 0x82)
- mes_set_hw_res_pkt.enable_lr_compute_wa = 1;
- else
- dev_info_once(adev->dev,
- "MES FW version must be >= 0x82 to enable LR compute workaround.\n");

/*
* Keep oversubscribe timer for sdma . When we have unmapped doorbell