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

[Alex Deucher]

On Mon, Nov 18, 2024 at 3:04 AM Kenneth Feng <kenneth.feng at amd.com> wrote:
>
> 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>

Acked-by: Alex Deucher <alexander.deucher 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
>