On Fri, May 15, 2020 at 08:24:45PM +0300, Imre Deak wrote:
> On Fri, May 15, 2020 at 07:21:06PM +0300, Ville Syrjälä wrote:
> > On Thu, May 14, 2020 at 11:45:53PM +0300, Imre Deak wrote:
> > > Make sure to select the port's AUX power domain while holding the TC
> > > port lock. The domain depends on the port's current TC mode, which may
> > > get changed under us if we're not holding the lock.
> >
> > Can we toss in a lockdep assert?
>
> Yes, can do that. However, now I realize, there is one more place to fix
> in intel_dp_force(), where I think we could just drop the aux get/put.
>
> So are you ok to do that as a follow-up?
Sure.
>
> > Did this by any chance help with the MST issues you were seeing?
>
> No, at least it didn't resolve it. Still some missing responses to MST
> down messages. More precisely the sink does send interrupts as a
> response, but the interrupt handler won't see the DP_DOWN_REP_MSG_RDY
> being set in ESI.
:(
>
> > > This was left out from
> > > commit 8c10e2262663 ("drm/i915: Keep the TypeC port mode fixed for detect/AUX transfers")
> > >
> > > Cc: <stable@xxxxxxxxxxxxxxx> # v5.4+
> > > Signed-off-by: Imre Deak <imre.deak@xxxxxxxxx>
> > > ---
> > > drivers/gpu/drm/i915/display/intel_dp.c | 5 +++--
> > > 1 file changed, 3 insertions(+), 2 deletions(-)
> > >
> > > diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> > > index 408c3c1c5e81..40d42dcff0b7 100644
> > > --- a/drivers/gpu/drm/i915/display/intel_dp.c
> > > +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> > > @@ -1359,8 +1359,7 @@ intel_dp_aux_xfer(struct intel_dp *intel_dp,
> > > bool is_tc_port = intel_phy_is_tc(i915, phy);
> > > i915_reg_t ch_ctl, ch_data[5];
> > > u32 aux_clock_divider;
> > > - enum intel_display_power_domain aux_domain =
> > > - intel_aux_power_domain(intel_dig_port);
> > > + enum intel_display_power_domain aux_domain;
> > > intel_wakeref_t aux_wakeref;
> > > intel_wakeref_t pps_wakeref;
> > > int i, ret, recv_bytes;
> > > @@ -1375,6 +1374,8 @@ intel_dp_aux_xfer(struct intel_dp *intel_dp,
> > > if (is_tc_port)
> > > intel_tc_port_lock(intel_dig_port);
> > >
> > > + aux_domain = intel_aux_power_domain(intel_dig_port);
> > > +
> > > aux_wakeref = intel_display_power_get(i915, aux_domain);
> > > pps_wakeref = pps_lock(intel_dp);
> > >
> > > --
> > > 2.23.1
> > >
> > > _______________________________________________
> > > Intel-gfx mailing list
> > > Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> > > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
> >
> > --
> > Ville Syrjälä
> > Intel
--
Ville Syrjälä
Intel
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