[PATCH v2] drm/i915/display: Wait for PHY readiness not needed for disabling sequence

[Kahola, Mika]

> -----Original Message-----
> From: Deak, Imre <imre.deak at intel.com>
> Sent: Wednesday, December 13, 2023 9:14 AM
> To: Kahola, Mika <mika.kahola at intel.com>
> Cc: intel-gfx at lists.freedesktop.org
> Subject: Re: [PATCH v2] drm/i915/display: Wait for PHY readiness not needed for disabling sequence
> 
> On Tue, Dec 12, 2023 at 01:51:30PM +0200, Mika Kahola wrote:
> > When going through the disconnection flow we don't need to wait for
> > PHY readiness and hence we can skip the wait part. For disabling the
> > function returns false as an indicator that the power is not enabled.
> > After all, we are not even using the return value when Type-C is disconnecting.
> >
> > v2: Cleanup for increased readibility (Imre)
> >
> > BSpec: 65380
> >
> > For VLK-53734
> >
> > Signed-off-by: Mika Kahola <mika.kahola at intel.com>
> 
> For next time: it would've been better to separate to refactor + fix patches. The change looks ok:

That's true that this really contains two parts, the refactoring and a small fix.

Thanks for the review!

-Mika-

> Reviewed-by: Imre Deak <imre.deak at intel.com>
> 
> > ---
> >  drivers/gpu/drm/i915/display/intel_tc.c | 25
> > ++++++++++++++++---------
> >  1 file changed, 16 insertions(+), 9 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_tc.c
> > b/drivers/gpu/drm/i915/display/intel_tc.c
> > index f64d348a969e..dcf05e00e505 100644
> > --- a/drivers/gpu/drm/i915/display/intel_tc.c
> > +++ b/drivers/gpu/drm/i915/display/intel_tc.c
> > @@ -1030,18 +1030,25 @@ static bool
> > xelpdp_tc_phy_enable_tcss_power(struct intel_tc_port *tc, bool enabl
> >
> >  	__xelpdp_tc_phy_enable_tcss_power(tc, enable);
> >
> > -	if ((!tc_phy_wait_for_ready(tc) ||
> > -	     !xelpdp_tc_phy_wait_for_tcss_power(tc, enable)) &&
> > -	    !drm_WARN_ON(&i915->drm, tc->mode == TC_PORT_LEGACY)) {
> > -		if (enable) {
> > -			__xelpdp_tc_phy_enable_tcss_power(tc, false);
> > -			xelpdp_tc_phy_wait_for_tcss_power(tc, false);
> > -		}
> > +	if (enable && !tc_phy_wait_for_ready(tc))
> > +		goto out_disable;
> >
> > -		return false;
> > -	}
> > +	if (!xelpdp_tc_phy_wait_for_tcss_power(tc, enable))
> > +		goto out_disable;
> >
> >  	return true;
> > +
> > +out_disable:
> > +	if (drm_WARN_ON(&i915->drm, tc->mode == TC_PORT_LEGACY))
> > +		return false;
> > +
> > +	if (!enable)
> > +		return false;
> > +
> > +	__xelpdp_tc_phy_enable_tcss_power(tc, false);
> > +	xelpdp_tc_phy_wait_for_tcss_power(tc, false);
> > +
> > +	return false;
> >  }
> >
> >  static void xelpdp_tc_phy_take_ownership(struct intel_tc_port *tc,
> > bool take)
> > --
> > 2.34.1
> >