[PATCH] drm/amd/pm: disable pcie speed switching on Intel platform for smu v14.0.2/3

[Wang, Yang(Kevin)]

[AMD Official Use Only - AMD Internal Distribution Only]

Acked-by: Yang Wang <kevinyang.wang at amd.com>

Best Regards,
Kevin

-----Original Message-----
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> On Behalf Of Kenneth Feng
Sent: Monday, November 18, 2024 16:01
To: amd-gfx at lists.freedesktop.org
Cc: Wang, Yang(Kevin) <KevinYang.Wang at amd.com>; Feng, Kenneth <Kenneth.Feng at amd.com>
Subject: [PATCH] drm/amd/pm: disable pcie speed switching on Intel platform for smu v14.0.2/3

disable pcie speed switching on Intel platform for smu v14.0.2/3 based on Intel's requirement.

Signed-off-by: Kenneth Feng <kenneth.feng at amd.com>
---
 drivers/gpu/drm/amd/pm/swsmu/smu14/smu_v14_0_2_ppt.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu14/smu_v14_0_2_ppt.c b/drivers/gpu/drm/amd/pm/swsmu/smu14/smu_v14_0_2_ppt.c
index 59b369eff30f..337d3312ef30 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/smu14/smu_v14_0_2_ppt.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/smu14/smu_v14_0_2_ppt.c
@@ -1472,6 +1472,14 @@ static int smu_v14_0_2_update_pcie_parameters(struct smu_context *smu,
                if (pcie_table->pcie_lane[i] > pcie_width_cap)
                        pcie_table->pcie_lane[i] = pcie_width_cap;

+               if (i < pcie_table->num_of_link_levels - 1 &&
+                       !(smu->adev->pm.pp_feature & PP_PCIE_DPM_MASK)) {
+                       if (pcie_table->pcie_gen[i] < pcie_gen_cap)
+                               pcie_table->pcie_gen[i] = pcie_gen_cap;
+                       if (pcie_table->pcie_lane[i] < pcie_width_cap)
+                               pcie_table->pcie_lane[i] = pcie_width_cap;
+               }
+
                smu_pcie_arg = i << 16;
                smu_pcie_arg |= pcie_table->pcie_gen[i] << 8;
                smu_pcie_arg |= pcie_table->pcie_lane[i];
--
2.34.1