[Intel-gfx] [PATCH v3 4/8] drm/i915/tc/icl: Implement TC cold sequences
Souza, Jose
jose.souza at intel.com
Tue Apr 7 22:20:02 UTC 2020
On Wed, 2020-04-08 at 01:03 +0300, Imre Deak wrote:
> On Tue, Apr 07, 2020 at 02:39:56PM -0700, José Roberto de Souza
> wrote:
> > This is required for legacy/static TC ports as IOM is not aware of
> > the connection and will not trigger the TC cold exit.
> >
> > Just request PCODE to exit TCCOLD is not enough as it could enter
> > again before driver makes use of the port, to prevent it BSpec
> > states
> > that aux powerwell should be held.
> >
> > So here embedding the TC cold exit sequence into ICL aux enable,
> > it will enable aux and then request TC cold to exit.
> >
> > The TC cold block(exit and aux hold) and unblock was added to some
> > exported TC functions for the others and to access PHY registers,
> > callers should enable and keep aux powerwell enabled during access.
> >
> > Also adding TC cold check and warnig in tc_port_load_fia_params()
> > as
> > at this point of the driver initialization we can't request power
> > wells, if we get this warning we will need to figure out how to
> > handle
> > it.
> >
> > v2:
> > - moved ICL TC cold exit function to intel_display_power
> > - using dig_port->tc_legacy_port to only execute sequences for
> > legacy
> > ports, hopefully VBTs will have this right
> > - fixed check to call _hsw_power_well_continue_enable()
> > - calling _hsw_power_well_continue_enable() unconditionally in
> > icl_tc_phy_aux_power_well_enable(), if needed we will surpress
> > timeout
> > warnings of TC legacy ports
> > - only blocking TC cold around fia access
> >
> > v3:
> > - added timeout of 5msec to not loop forever if
> > sandybridge_pcode_write_timeout() keeps returning -EAGAIN
> > returning -EAGAIN in in icl_tc_cold_exit()
> > - removed leftover tc_cold_wakeref
> > - added one msec sleep when PCODE returns -EAGAIN
> >
> > BSpec: 21750
> > Fixes: https://gitlab.freedesktop.org/drm/intel/issues/1296
> > Cc: Imre Deak <imre.deak at intel.com>
> > Cc: Cooper Chiou <cooper.chiou at intel.com>
> > Cc: Kai-Heng Feng <kai.heng.feng at canonical.com>
> > Signed-off-by: José Roberto de Souza <jose.souza at intel.com>
> > ---
> > .../drm/i915/display/intel_display_power.c | 24 ++++++-
> > drivers/gpu/drm/i915/display/intel_tc.c | 64
> > +++++++++++++++++--
> > drivers/gpu/drm/i915/i915_reg.h | 1 +
> > 3 files changed, 82 insertions(+), 7 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_display_power.c
> > b/drivers/gpu/drm/i915/display/intel_display_power.c
> > index 1cd271d0f114..2d7b2999561a 100644
> > --- a/drivers/gpu/drm/i915/display/intel_display_power.c
> > +++ b/drivers/gpu/drm/i915/display/intel_display_power.c
> > @@ -575,6 +575,27 @@ static void icl_tc_port_assert_ref_held(struct
> > drm_i915_private *dev_priv,
> >
> > #define TGL_AUX_PW_TO_TC_PORT(pw_idx) ((pw_idx) -
> > TGL_PW_CTL_IDX_AUX_TC1)
> >
> > +static void icl_tc_cold_exit(struct drm_i915_private *i915)
> > +{
> > + const ktime_t timeout = ktime_add_ms(ktime_get_raw(), 5);
> > + int ret;
> > +
> > + do {
> > + ret = sandybridge_pcode_write_timeout(i915,
> > + ICL_PCODE_EXIT_TC
> > COLD,
> > + 0, 250, 1);
> > + if (ret == -EAGAIN)
> > + msleep(1);
> > + } while (ret == -EAGAIN && ktime_compare(timeout,
> > ktime_get_raw()) > 0);
>
> this could exit after a single pcode_write() that polled for 1ms, and
> msleep(1); is not needed in the last iteration. Retrying 3 times as
> discussed earlier would solve that.
>
> > +
> > + /* Spec states that TC cold exit can take up to 1ms to complete
> > */
> > + if (!ret)
> > + msleep(1);
> > +
> > + drm_dbg_kms(&i915->drm, "TC cold block %s\n", ret ? "failed" :
> > + "succeeded");
>
> You missed turning this to an error.
Can we postpone this at least for ICL?
The ICL machines in CI don't have
the IFWI that have this PCODE command, so it is failing.
I have asked to
CI team do update but it is going to take a while. VLK-9040
>
> > +}
> > +
> > static void
> > icl_tc_phy_aux_power_well_enable(struct drm_i915_private
> > *dev_priv,
> > struct i915_power_well *power_well)
> > @@ -593,7 +614,8 @@ icl_tc_phy_aux_power_well_enable(struct
> > drm_i915_private *dev_priv,
> >
> > hsw_power_well_enable_prepare(dev_priv, power_well);
> >
> > - /* TODO ICL TC cold handling */
> > + if (INTEL_GEN(dev_priv) == 11 && dig_port->tc_legacy_port)
> > + icl_tc_cold_exit(dev_priv);
> >
> > hsw_power_well_enable_complete(dev_priv, power_well);
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_tc.c
> > b/drivers/gpu/drm/i915/display/intel_tc.c
> > index 9b850c11aa78..74061bf9b2b9 100644
> > --- a/drivers/gpu/drm/i915/display/intel_tc.c
> > +++ b/drivers/gpu/drm/i915/display/intel_tc.c
> > @@ -34,6 +34,7 @@ tc_port_load_fia_params(struct drm_i915_private
> > *i915,
> > if (INTEL_INFO(i915)->display.has_modular_fia) {
> > modular_fia = intel_uncore_read(&i915->uncore,
> > PORT_TX_DFLEXDPSP(FIA1)
> > );
> > + drm_WARN_ON(&i915->drm, modular_fia == 0xffffffff);
> > modular_fia &= MODULAR_FIA_MASK;
> > } else {
> > modular_fia = 0;
> > @@ -52,6 +53,37 @@ tc_port_load_fia_params(struct drm_i915_private
> > *i915,
> > }
> > }
> >
> > +static intel_wakeref_t
> > +tc_cold_block(struct intel_digital_port *dig_port)
> > +{
> > + struct drm_i915_private *i915 = to_i915(dig_port-
> > >base.base.dev);
> > + enum intel_display_power_domain domain;
> > +
> > + if (INTEL_GEN(i915) != 11 || !dig_port->tc_legacy_port)
> > + return 0;
> > +
> > + domain = intel_legacy_aux_to_power_domain(dig_port->aux_ch);
> > + return intel_display_power_get(i915, domain);
> > +}
> > +
> > +static void
> > +tc_cold_unblock(struct intel_digital_port *dig_port,
> > intel_wakeref_t wakeref)
> > +{
> > + struct drm_i915_private *i915 = to_i915(dig_port-
> > >base.base.dev);
> > + enum intel_display_power_domain domain;
> > +
> > + /*
> > + * wakeref == -1, means some error happened saving
> > save_depot_stack but
> > + * power should still be put down and 0 is a invalid
> > save_depot_stack
> > + * id so can be used to skip it for non TC legacy ports.
> > + */
> > + if (wakeref == 0)
> > + return;
> > +
> > + domain = intel_legacy_aux_to_power_domain(dig_port->aux_ch);
> > + intel_display_power_put_async(i915, domain, wakeref);
> > +}
> > +
> > u32 intel_tc_port_get_lane_mask(struct intel_digital_port
> > *dig_port)
> > {
> > struct drm_i915_private *i915 = to_i915(dig_port-
> > >base.base.dev);
> > @@ -415,9 +447,14 @@ static void intel_tc_port_reset_mode(struct
> > intel_digital_port *dig_port,
> > enum tc_port_mode old_tc_mode = dig_port->tc_mode;
> >
> > intel_display_power_flush_work(i915);
> > - drm_WARN_ON(&i915->drm,
> > - intel_display_power_is_enabled(i915,
> > - intel_aux_power_domain(dig_port
> > )));
> > + if (INTEL_GEN(i915) != 11 || !dig_port->tc_legacy_port) {
> > + enum intel_display_power_domain aux_domain;
> > + bool aux_powered;
> > +
> > + aux_domain = intel_aux_power_domain(dig_port);
> > + aux_powered = intel_display_power_is_enabled(i915,
> > aux_domain);
> > + drm_WARN_ON(&i915->drm, aux_powered);
> > + }
> >
> > icl_tc_phy_disconnect(dig_port);
> > icl_tc_phy_connect(dig_port, required_lanes);
> > @@ -439,9 +476,11 @@ intel_tc_port_link_init_refcount(struct
> > intel_digital_port *dig_port,
> > void intel_tc_port_sanitize(struct intel_digital_port *dig_port)
> > {
> > struct intel_encoder *encoder = &dig_port->base;
> > + intel_wakeref_t tc_cold_wref;
> > int active_links = 0;
> >
> > mutex_lock(&dig_port->tc_lock);
> > + tc_cold_wref = tc_cold_block(dig_port);
> >
> > dig_port->tc_mode = intel_tc_port_get_current_mode(dig_port);
> > if (dig_port->dp.is_mst)
> > @@ -466,6 +505,7 @@ void intel_tc_port_sanitize(struct
> > intel_digital_port *dig_port)
> > dig_port->tc_port_name,
> > tc_port_mode_name(dig_port->tc_mode));
> >
> > + tc_cold_unblock(dig_port, tc_cold_wref);
> > mutex_unlock(&dig_port->tc_lock);
> > }
> >
> > @@ -487,10 +527,15 @@ static bool intel_tc_port_needs_reset(struct
> > intel_digital_port *dig_port)
> > bool intel_tc_port_connected(struct intel_digital_port *dig_port)
> > {
> > bool is_connected;
> > + intel_wakeref_t tc_cold_wref;
> >
> > intel_tc_port_lock(dig_port);
> > + tc_cold_wref = tc_cold_block(dig_port);
> > +
> > is_connected = tc_port_live_status_mask(dig_port) &
> > BIT(dig_port->tc_mode);
> > +
> > + tc_cold_unblock(dig_port, tc_cold_wref);
> > intel_tc_port_unlock(dig_port);
> >
> > return is_connected;
> > @@ -506,9 +551,16 @@ static void __intel_tc_port_lock(struct
> > intel_digital_port *dig_port,
> >
> > mutex_lock(&dig_port->tc_lock);
> >
> > - if (!dig_port->tc_link_refcount &&
> > - intel_tc_port_needs_reset(dig_port))
> > - intel_tc_port_reset_mode(dig_port, required_lanes);
> > + if (!dig_port->tc_link_refcount) {
> > + intel_wakeref_t tc_cold_wref;
> > +
> > + tc_cold_wref = tc_cold_block(dig_port);
> > +
> > + if (intel_tc_port_needs_reset(dig_port))
> > + intel_tc_port_reset_mode(dig_port,
> > required_lanes);
> > +
> > + tc_cold_unblock(dig_port, tc_cold_wref);
> > + }
> >
> > drm_WARN_ON(&i915->drm, dig_port->tc_lock_wakeref);
> > dig_port->tc_lock_wakeref = wakeref;
> > diff --git a/drivers/gpu/drm/i915/i915_reg.h
> > b/drivers/gpu/drm/i915/i915_reg.h
> > index 1a7bd6db164b..0389afa2361f 100644
> > --- a/drivers/gpu/drm/i915/i915_reg.h
> > +++ b/drivers/gpu/drm/i915/i915_reg.h
> > @@ -9108,6 +9108,7 @@ enum {
> > #define ICL_PCODE_MEM_SS_READ_QGV_POINT_INFO(point) (((poin
> > t) << 16) | (0x1 << 8))
> > #define GEN6_PCODE_READ_D_COMP 0x10
> > #define GEN6_PCODE_WRITE_D_COMP 0x11
> > +#define ICL_PCODE_EXIT_TCCOLD 0x12
> > #define HSW_PCODE_DE_WRITE_FREQ_REQ 0x17
> > #define DISPLAY_IPS_CONTROL 0x19
> > /* See also IPS_CTL */
> > --
> > 2.26.0
> >
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