[PATCH] drm/amd: Fix logic error in sienna_cichlid_update_pcie_parameters()
Hamza Mahfooz
hamza.mahfooz at amd.com
Fri Sep 29 15:23:14 UTC 2023
On 9/26/23 22:07, Mario Limonciello wrote:
> While aligning SMU11 with SMU13 implementation an assumption was made that
> `dpm_context->dpm_tables.pcie_table` was populated in dpm table initialization
> like in SMU13 but it isn't.
>
> So restore some of the original logic and instead just check for
> amdgpu_device_pcie_dynamic_switching_supported() to decide whether to hardcode
> values; erring on the side of performance.
>
> Cc: stable at vger.kernel.org # 6.1+
> Reported-and-tested-by: Umio Yasuno <coelacanth_dream at protonmail.com>
> Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/1447#note_2101382
> Fixes: e701156ccc6c ("drm/amd: Align SMU11 SMU_MSG_OverridePcieParameters implementation with SMU13")
> Signed-off-by: Mario Limonciello <mario.limonciello at amd.com>
> ---
> .../amd/pm/swsmu/smu11/sienna_cichlid_ppt.c | 41 +++++++++++--------
> 1 file changed, 23 insertions(+), 18 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/pm/swsmu/smu11/sienna_cichlid_ppt.c b/drivers/gpu/drm/amd/pm/swsmu/smu11/sienna_cichlid_ppt.c
> index f0800c0c5168..9119b0df2419 100644
> --- a/drivers/gpu/drm/amd/pm/swsmu/smu11/sienna_cichlid_ppt.c
> +++ b/drivers/gpu/drm/amd/pm/swsmu/smu11/sienna_cichlid_ppt.c
> @@ -2081,36 +2081,41 @@ static int sienna_cichlid_display_disable_memory_clock_switch(struct smu_context
> return ret;
> }
>
> +#define MAX(a, b) ((a) > (b) ? (a) : (b))
Is there a reason why you can't use the max() defined in linux/minmax.h
instead?
> +
> static int sienna_cichlid_update_pcie_parameters(struct smu_context *smu,
> uint32_t pcie_gen_cap,
> uint32_t pcie_width_cap)
> {
> struct smu_11_0_dpm_context *dpm_context = smu->smu_dpm.dpm_context;
> struct smu_11_0_pcie_table *pcie_table = &dpm_context->dpm_tables.pcie_table;
> - u32 smu_pcie_arg;
> + uint8_t *table_member1, *table_member2;
> + uint32_t min_gen_speed, max_gen_speed;
> + uint32_t min_lane_width, max_lane_width;
> + uint32_t smu_pcie_arg;
> int ret, i;
>
> - /* PCIE gen speed and lane width override */
> - if (!amdgpu_device_pcie_dynamic_switching_supported()) {
> - if (pcie_table->pcie_gen[NUM_LINK_LEVELS - 1] < pcie_gen_cap)
> - pcie_gen_cap = pcie_table->pcie_gen[NUM_LINK_LEVELS - 1];
> + GET_PPTABLE_MEMBER(PcieGenSpeed, &table_member1);
> + GET_PPTABLE_MEMBER(PcieLaneCount, &table_member2);
>
> - if (pcie_table->pcie_lane[NUM_LINK_LEVELS - 1] < pcie_width_cap)
> - pcie_width_cap = pcie_table->pcie_lane[NUM_LINK_LEVELS - 1];
> + min_gen_speed = MAX(0, table_member1[0]);
> + max_gen_speed = MIN(pcie_gen_cap, table_member1[1]);
> + min_gen_speed = min_gen_speed > max_gen_speed ?
> + max_gen_speed : min_gen_speed;
> + min_lane_width = MAX(1, table_member2[0]);
> + max_lane_width = MIN(pcie_width_cap, table_member2[1]);
> + min_lane_width = min_lane_width > max_lane_width ?
> + max_lane_width : min_lane_width;
>
> - /* Force all levels to use the same settings */
> - for (i = 0; i < NUM_LINK_LEVELS; i++) {
> - pcie_table->pcie_gen[i] = pcie_gen_cap;
> - pcie_table->pcie_lane[i] = pcie_width_cap;
> - }
> + if (!amdgpu_device_pcie_dynamic_switching_supported()) {
> + pcie_table->pcie_gen[0] = max_gen_speed;
> + pcie_table->pcie_lane[0] = max_lane_width;
> } else {
> - for (i = 0; i < NUM_LINK_LEVELS; i++) {
> - 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;
> - }
> + pcie_table->pcie_gen[0] = min_gen_speed;
> + pcie_table->pcie_lane[0] = min_lane_width;
> }
> + pcie_table->pcie_gen[1] = max_gen_speed;
> + pcie_table->pcie_lane[1] = max_lane_width;
>
> for (i = 0; i < NUM_LINK_LEVELS; i++) {
> smu_pcie_arg = (i << 16 |
--
Hamza
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