On Wed, 2020-04-01 at 15:55 +0300, Imre Deak wrote:
> On Tue, Mar 31, 2020 at 05:41:20PM -0700, José Roberto de Souza
> wrote:
> > TC ports can enter in TCCOLD to save power and is required to
> > request
> > to PCODE to exit this state before use or read to TC registers.
> >
> > For TGL there is a new MBOX command to do that with a parameter to
> > ask
> > PCODE to exit and block TCCOLD entry or unblock TCCOLD entry.
> >
> > So adding a new power domain to reuse the refcount and only allow
> > TC cold when all TC ports are not in use.
> >
> > BSpec: 49294
> > Cc: Imre Deak <imre.deak@xxxxxxxxx>
> > Cc: Cooper Chiou <cooper.chiou@xxxxxxxxx>
> > Cc: Kai-Heng Feng <kai.heng.feng@xxxxxxxxxxxxx>
> > Signed-off-by: José Roberto de Souza <jose.souza@xxxxxxxxx>
> > ---
> > .../drm/i915/display/intel_display_power.c | 46 ++++++++++++++
> > .../drm/i915/display/intel_display_power.h | 1 +
> > drivers/gpu/drm/i915/display/intel_tc.c | 63
> > +++++++++++++++----
> > drivers/gpu/drm/i915/display/intel_tc.h | 1 +
> > drivers/gpu/drm/i915/i915_reg.h | 3 +
> > 5 files changed, 103 insertions(+), 11 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c
> > b/drivers/gpu/drm/i915/display/intel_display_power.c
> > index 1ccd57d645c7..5de115583146 100644
> > --- a/drivers/gpu/drm/i915/display/intel_display_power.c
> > +++ b/drivers/gpu/drm/i915/display/intel_display_power.c
> > @@ -2842,6 +2842,8 @@ void intel_display_power_put(struct
> > drm_i915_private *dev_priv,
> > #define TGL_AUX_I_TBT6_IO_POWER_DOMAINS ( \
> > BIT_ULL(POWER_DOMAIN_AUX_I_TBT))
> >
> > +#define TGL_TC_COLD_OFF (BIT_ULL(POWER_DOMAIN_TC_COLD_OFF))
>
> TGL_TC_COLD_OFF_POWER_DOMAINS
Okay
> and should also include all the AUX power domains.
So we would call intel_display_power_get() in intel_tc with aux domain
instead of POWER_DOMAIN_TC_COLD_OFF?
>
> > +
> > static const struct i915_power_well_ops
> > i9xx_always_on_power_well_ops = {
> > .sync_hw = i9xx_power_well_sync_hw_noop,
> > .enable = i9xx_always_on_power_well_noop,
> > @@ -3944,6 +3946,44 @@ static const struct i915_power_well_desc
> > ehl_power_wells[] = {
> > },
> > };
> >
> > +static void
> > +tgl_tc_cold_off_power_well_enable(struct drm_i915_private *i915,
> > + struct i915_power_well *power_well)
> > +{
> > + intel_tc_tgl_tc_cold_request(i915, true);
> > +}
> > +
> > +static void
> > +tgl_tc_cold_off_power_well_disable(struct drm_i915_private *i915,
> > + struct i915_power_well *power_well)
> > +{
> > + intel_tc_tgl_tc_cold_request(i915, false);
> > +}
> > +
> > +static void
> > +tgl_tc_cold_off_power_well_sync_hw(struct drm_i915_private *i915,
> > + struct i915_power_well *power_well)
> > +{
> > + if (power_well->count > 0)
> > + tgl_tc_cold_off_power_well_enable(i915, power_well);
> > + else
> > + tgl_tc_cold_off_power_well_disable(i915, power_well);
> > +}
> > +
> > +static bool tgl_tc_cold_off_power_well_is_enabled(struct
> > drm_i915_private *dev_priv,
> > + struct
> > i915_power_well *power_well)
> > +{
> > + /* There is no way to just read it from PCODE */
> > + return false;
> > +}
> > +
> > +static const struct i915_power_well_ops tgl_tc_cold_off_ops = {
> > + .sync_hw = tgl_tc_cold_off_power_well_sync_hw,
> > + .enable = tgl_tc_cold_off_power_well_enable,
> > + .disable = tgl_tc_cold_off_power_well_disable,
> > + .is_enabled = tgl_tc_cold_off_power_well_is_enabled,
> > +};
> > +
> > static const struct i915_power_well_desc tgl_power_wells[] = {
> > {
> > .name = "always-on",
> > @@ -4271,6 +4311,12 @@ static const struct i915_power_well_desc
> > tgl_power_wells[] = {
> > .hsw.irq_pipe_mask = BIT(PIPE_D),
> > },
> > },
> > + {
> > + .name = "TC cold off",
> > + .domains = POWER_DOMAIN_TC_COLD_OFF,
>
> TGL_TC_COLD_OFF_POWER_DOMAINS
>
> > + .ops = &tgl_tc_cold_off_ops,
> > + .id = DISP_PW_ID_NONE,
> > + },
> > };
> >
> > static int
> > diff --git a/drivers/gpu/drm/i915/display/intel_display_power.h
> > b/drivers/gpu/drm/i915/display/intel_display_power.h
> > index da64a5edae7a..070457e7b948 100644
> > --- a/drivers/gpu/drm/i915/display/intel_display_power.h
> > +++ b/drivers/gpu/drm/i915/display/intel_display_power.h
> > @@ -76,6 +76,7 @@ enum intel_display_power_domain {
> > POWER_DOMAIN_MODESET,
> > POWER_DOMAIN_GT_IRQ,
> > POWER_DOMAIN_DPLL_DC_OFF,
> > + POWER_DOMAIN_TC_COLD_OFF,
> > POWER_DOMAIN_INIT,
> >
> > POWER_DOMAIN_NUM,
> > diff --git a/drivers/gpu/drm/i915/display/intel_tc.c
> > b/drivers/gpu/drm/i915/display/intel_tc.c
> > index b6d67f069ef7..58f19037411a 100644
> > --- a/drivers/gpu/drm/i915/display/intel_tc.c
> > +++ b/drivers/gpu/drm/i915/display/intel_tc.c
> > @@ -507,11 +507,16 @@ static void __intel_tc_port_lock(struct
> > intel_digital_port *dig_port,
> >
> > mutex_lock(&dig_port->tc_lock);
> >
> > - if (INTEL_GEN(i915) == 11 && dig_port->tc_link_refcount == 0) {
> > - enum intel_display_power_domain aux_domain;
> > + if (dig_port->tc_link_refcount == 0) {
> > + enum intel_display_power_domain domain;
> >
> > - aux_domain = intel_aux_ch_to_power_domain(dig_port-
> > >aux_ch);
> > - dig_port->tc_cold_wakeref =
> > intel_display_power_get(i915, aux_domain);
> > + if (INTEL_GEN(i915) == 11)
> > + domain = intel_aux_ch_to_power_domain(dig_port-
> > >aux_ch);
> > + else
> > + domain = POWER_DOMAIN_TC_COLD_OFF;
> > +
> > + dig_port->tc_cold_wakeref =
> > intel_display_power_get(i915,
> > + dom
> > ain);
> > }
> >
> > if (!dig_port->tc_link_refcount &&
> > @@ -527,18 +532,23 @@ void intel_tc_port_lock(struct
> > intel_digital_port *dig_port)
> > __intel_tc_port_lock(dig_port, 1);
> > }
> >
> > -static void icl_tc_cold_unblock(struct intel_digital_port
> > *dig_port)
> > +static void tc_cold_unblock(struct intel_digital_port *dig_port)
> > {
> > struct drm_i915_private *i915 = to_i915(dig_port-
> > >base.base.dev);
> > - enum intel_display_power_domain aux_domain;
> > + enum intel_display_power_domain domain;
> > intel_wakeref_t tc_cold_wakeref;
> >
> > - if (INTEL_GEN(i915) != 11 || dig_port->tc_link_refcount > 0)
> > + if (dig_port->tc_link_refcount > 0)
>
> You could drop the ref whenever wakeref passed to this function is
> not NULL.
>
> > return;
> >
> > tc_cold_wakeref = fetch_and_zero(&dig_port->tc_cold_wakeref);
> > - aux_domain = intel_aux_ch_to_power_domain(dig_port->aux_ch);
> > - intel_display_power_put_async(i915, aux_domain,
> > tc_cold_wakeref);
> > +
> > + if (INTEL_GEN(i915) == 11)
> > + domain = intel_aux_ch_to_power_domain(dig_port-
> > >aux_ch);
> > + else
> > + domain = POWER_DOMAIN_TC_COLD_OFF;
> > +
> > + intel_display_power_put_async(i915, domain, tc_cold_wakeref);
> > }
> >
> > void intel_tc_port_unlock(struct intel_digital_port *dig_port)
> > @@ -546,7 +556,7 @@ void intel_tc_port_unlock(struct
> > intel_digital_port *dig_port)
> > struct drm_i915_private *i915 = to_i915(dig_port-
> > >base.base.dev);
> > intel_wakeref_t wakeref = fetch_and_zero(&dig_port-
> > >tc_lock_wakeref);
> >
> > - icl_tc_cold_unblock(dig_port);
> > + tc_cold_unblock(dig_port);
> >
> > mutex_unlock(&dig_port->tc_lock);
> >
> > @@ -571,7 +581,7 @@ void intel_tc_port_put_link(struct
> > intel_digital_port *dig_port)
> > {
> > mutex_lock(&dig_port->tc_lock);
> > dig_port->tc_link_refcount--;
> > - icl_tc_cold_unblock(dig_port);
> > + tc_cold_unblock(dig_port);
> > mutex_unlock(&dig_port->tc_lock);
> > }
> >
> > @@ -611,3 +621,34 @@ void intel_tc_icl_tc_cold_exit(struct
> > drm_i915_private *i915)
> > drm_dbg_kms(&i915->drm, "TC cold block %s\n",
> > (ret == 0 ? "succeeded" : "failed"));
> > }
> > +
> > +void
> > +intel_tc_tgl_tc_cold_request(struct drm_i915_private *i915, bool
> > block)
> > +{
> > + u32 low_val, high_val;
> > + u8 tries = 0;
> > + int ret;
> > +
> > + do {
> > + low_val = 0;
> > + high_val = block ? 0 :
> > TGL_PCODE_EXIT_TCCOLD_DATA_H_UNBLOCK_REQ;
> > +
> > + ret = sandybridge_pcode_read(i915, TGL_PCODE_TCCOLD,
> > &low_val,
> > + &high_val);
> > + if (ret == 0) {
> > + if (block &&
> > + (low_val &
> > TGL_PCODE_EXIT_TCCOLD_DATA_L_EXIT_FAILED))
> > + ret = -EIO;
> > + else
> > + break;
> > + }
> > +
> > + if (ret != -EAGAIN)
> > + tries++;
> > + } while (tries < 3);
> > +
> > + if (ret)
> > + drm_dbg_kms(&i915->drm, "TC cold %sblock %s\n",
> > + (block ? "" : "un"),
> > + (ret == 0 ? "succeeded" : "failed"));
> > +}
> > diff --git a/drivers/gpu/drm/i915/display/intel_tc.h
> > b/drivers/gpu/drm/i915/display/intel_tc.h
> > index 168d8896fcfd..8bb358cc8f15 100644
> > --- a/drivers/gpu/drm/i915/display/intel_tc.h
> > +++ b/drivers/gpu/drm/i915/display/intel_tc.h
> > @@ -31,5 +31,6 @@ void intel_tc_port_init(struct intel_digital_port
> > *dig_port, bool is_legacy);
> >
> > u32 intel_tc_port_live_status_mask(struct intel_digital_port
> > *dig_port);
> > void intel_tc_icl_tc_cold_exit(struct drm_i915_private *i915);
> > +void intel_tc_tgl_tc_cold_request(struct drm_i915_private *i915,
> > bool block);
> >
> > #endif /* __INTEL_TC_H__ */
> > diff --git a/drivers/gpu/drm/i915/i915_reg.h
> > b/drivers/gpu/drm/i915/i915_reg.h
> > index b111815d6596..5548f3b56c0b 100644
> > --- a/drivers/gpu/drm/i915/i915_reg.h
> > +++ b/drivers/gpu/drm/i915/i915_reg.h
> > @@ -9110,6 +9110,9 @@ enum {
> > #define ICL_PCODE_EXIT_TCCOLD 0x12
> > #define HSW_PCODE_DE_WRITE_FREQ_REQ 0x17
> > #define DISPLAY_IPS_CONTROL 0x19
> > +#define TGL_PCODE_TCCOLD 0x26
> > +#define TGL_PCODE_EXIT_TCCOLD_DATA_L_EXIT_FAILED REG_BIT(0)
> > +#define TGL_PCODE_EXIT_TCCOLD_DATA_H_UNBLOCK_REQ REG_BIT(0)
> > /* See also IPS_CTL */
> > #define IPS_PCODE_CONTROL (1 << 30)
> > #define HSW_PCODE_DYNAMIC_DUTY_CYCLE_CONTROL 0x1A
> > --
> > 2.26.0
> >
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