[PATCH] drm/amd/pm: conditionally disable pcie lane switching for some sienna_cichlid SKUs
Alex Deucher
alexdeucher at gmail.com
Wed May 31 12:12:34 UTC 2023
Sure. Please go ahead.
Alex
On Wed, May 31, 2023 at 5:54 AM Quan, Evan <Evan.Quan at amd.com> wrote:
>
> [AMD Official Use Only - General]
>
> Hi Alex,
>
> Can we land this as a temporary solution while we are seeking a more proper one?
> This is gating our customer and I was pushed for a solution.
>
> BR,
> Evan
> > -----Original Message-----
> > From: Quan, Evan
> > Sent: Friday, April 21, 2023 3:32 PM
> > To: amd-gfx at lists.freedesktop.org
> > Cc: Deucher, Alexander <Alexander.Deucher at amd.com>; Limonciello, Mario
> > <Mario.Limonciello at amd.com>
> > Subject: RE: [PATCH] drm/amd/pm: conditionally disable pcie lane switching
> > for some sienna_cichlid SKUs
> >
> > [AMD Official Use Only - General]
> >
> > This seems able to address some audio noise issue observed per customer's
> > feedback.
> >
> > Evan
> > > -----Original Message-----
> > > From: Quan, Evan <Evan.Quan at amd.com>
> > > Sent: Friday, April 21, 2023 3:29 PM
> > > To: amd-gfx at lists.freedesktop.org
> > > Cc: Deucher, Alexander <Alexander.Deucher at amd.com>; Limonciello, Mario
> > > <Mario.Limonciello at amd.com>; Quan, Evan <Evan.Quan at amd.com>
> > > Subject: [PATCH] drm/amd/pm: conditionally disable pcie lane switching
> > > for some sienna_cichlid SKUs
> > >
> > > Disable the pcie lane switching for some sienna_cichlid SKUs since it
> > > might not work well on some platforms.
> > >
> > > Signed-off-by: Evan Quan <evan.quan at amd.com>
> > > Change-Id: Iea9ceaa146c8706768ee077c10e5d33bce9bc1c2
> > > ---
> > > .../amd/pm/swsmu/smu11/sienna_cichlid_ppt.c | 92 +++++++++++++++-
> > --
> > > -
> > > 1 file changed, 74 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 4b91cdc3eaa0..e7223513e384 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
> > > @@ -2067,33 +2067,94 @@ static int
> > > sienna_cichlid_display_disable_memory_clock_switch(struct smu_context
> > > return ret;
> > > }
> > >
> > > +static void sienna_cichlid_get_override_pcie_settings(struct
> > > +smu_context
> > > *smu,
> > > + uint32_t
> > > *gen_speed_override,
> > > + uint32_t
> > > *lane_width_override)
> > > +{
> > > + struct amdgpu_device *adev = smu->adev;
> > > +
> > > + *gen_speed_override = 0xff;
> > > + *lane_width_override = 0xff;
> > > +
> > > + switch (adev->pdev->device) {
> > > + case 0x73A0:
> > > + case 0x73A1:
> > > + case 0x73A2:
> > > + case 0x73A3:
> > > + case 0x73AB:
> > > + case 0x73AE:
> > > + /* Bit 7:0: PCIE lane width, 1 to 7 corresponds is x1 to x32 */
> > > + *lane_width_override = 6;
> > > + break;
> > > + case 0x73E0:
> > > + case 0x73E1:
> > > + case 0x73E3:
> > > + *lane_width_override = 4;
> > > + break;
> > > + case 0x7420:
> > > + case 0x7421:
> > > + case 0x7422:
> > > + case 0x7423:
> > > + case 0x7424:
> > > + *lane_width_override = 3;
> > > + break;
> > > + default:
> > > + break;
> > > + }
> > > +}
> > > +
> > > +#define MAX(a, b) ((a) > (b) ? (a) : (b))
> > > +
> > > 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;
> > > -
> > > - uint32_t smu_pcie_arg;
> > > + struct smu_11_0_pcie_table *pcie_table = &dpm_context-
> > > >dpm_tables.pcie_table;
> > > + uint32_t gen_speed_override, lane_width_override;
> > > 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;
> > >
> > > GET_PPTABLE_MEMBER(PcieGenSpeed, &table_member1);
> > > GET_PPTABLE_MEMBER(PcieLaneCount, &table_member2);
> > >
> > > - /* lclk dpm table setup */
> > > - for (i = 0; i < MAX_PCIE_CONF; i++) {
> > > - dpm_context->dpm_tables.pcie_table.pcie_gen[i] =
> > > table_member1[i];
> > > - dpm_context->dpm_tables.pcie_table.pcie_lane[i] =
> > > table_member2[i];
> > > + sienna_cichlid_get_override_pcie_settings(smu,
> > > + &gen_speed_override,
> > > + &lane_width_override);
> > > +
> > > + /* PCIE gen speed override */
> > > + if (gen_speed_override != 0xff) {
> > > + min_gen_speed = MIN(pcie_gen_cap, gen_speed_override);
> > > + max_gen_speed = MIN(pcie_gen_cap,
> > > gen_speed_override);
> > > + } else {
> > > + 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;
> > > }
> > > + pcie_table->pcie_gen[0] = min_gen_speed;
> > > + pcie_table->pcie_gen[1] = max_gen_speed;
> > > +
> > > + /* PCIE lane width override */
> > > + if (lane_width_override != 0xff) {
> > > + min_lane_width = MIN(pcie_width_cap,
> > > lane_width_override);
> > > + max_lane_width = MIN(pcie_width_cap,
> > > lane_width_override);
> > > + } else {
> > > + 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;
> > > + }
> > > + pcie_table->pcie_lane[0] = min_lane_width;
> > > + pcie_table->pcie_lane[1] = max_lane_width;
> > >
> > > for (i = 0; i < NUM_LINK_LEVELS; i++) {
> > > - smu_pcie_arg = (i << 16) |
> > > - ((table_member1[i] <= pcie_gen_cap) ?
> > > - (table_member1[i] << 8) :
> > > - (pcie_gen_cap << 8)) |
> > > - ((table_member2[i] <= pcie_width_cap) ?
> > > - table_member2[i] :
> > > - pcie_width_cap);
> > > + smu_pcie_arg = (i << 16 |
> > > + pcie_table->pcie_gen[i] << 8 |
> > > + pcie_table->pcie_lane[i]);
> > >
> > > ret = smu_cmn_send_smc_msg_with_param(smu,
> > > SMU_MSG_OverridePcieParameters,
> > > @@ -2101,11 +2162,6 @@ static int
> > > sienna_cichlid_update_pcie_parameters(struct smu_context *smu,
> > > NULL);
> > > if (ret)
> > > return ret;
> > > -
> > > - if (table_member1[i] > pcie_gen_cap)
> > > - dpm_context->dpm_tables.pcie_table.pcie_gen[i] =
> > > pcie_gen_cap;
> > > - if (table_member2[i] > pcie_width_cap)
> > > - dpm_context->dpm_tables.pcie_table.pcie_lane[i] =
> > > pcie_width_cap;
> > > }
> > >
> > > return 0;
> > > --
> > > 2.34.1
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