On Fri, Mar 08, 2024 at 04:39:55PM +0200, Ville Syrjälä wrote:
> On Fri, Mar 08, 2024 at 01:00:38PM +0200, Jouni Högander wrote:
> > IO buffer wake time used for IO wake calculation is dependent on port clock
> > on LunarLake and beyond. Take this into account in get_io_buffer_wake_time.
> >
> > Bspec: 65450
> >
> > v2: add own io_wake_time helper for LunarLake
> >
> > Signed-off-by: Jouni Högander <jouni.hogander@xxxxxxxxx>
> > ---
> > drivers/gpu/drm/i915/display/intel_psr.c | 14 +++++++++++++-
> > 1 file changed, 13 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
> > index 747761efa4be..e3daaf05d640 100644
> > --- a/drivers/gpu/drm/i915/display/intel_psr.c
> > +++ b/drivers/gpu/drm/i915/display/intel_psr.c
> > @@ -1165,11 +1165,23 @@ static int tgl_io_buffer_wake_time(void)
> > return 10;
> > }
> >
> > +static int lnl_io_buffer_wake_time(int port_clock)
> > +{
> > + if (port_clock > 270000)
> > + return 10;
> > + else if (port_clock > 162000)
> > + return 11;
> > + else
> > + return 15;
> > +}
>
> These numbers are only listed in the MTL section of bspec. There
> is nothing like this in the LNL PHY power section AFAICS.
Windows appears to use fixed 12us here.
>
> > +
> > static int io_buffer_wake_time(const struct intel_crtc_state *crtc_state)
> > {
> > struct drm_i915_private *i915 = to_i915(crtc_state->uapi.crtc->dev);
> >
> > - if (DISPLAY_VER(i915) >= 12)
> > + if (DISPLAY_VER(i915) >= 20)
> > + return lnl_io_buffer_wake_time(crtc_state->port_clock);
> > + else if (DISPLAY_VER(i915) >= 12)
> > return tgl_io_buffer_wake_time();
> > else
> > return skl_io_buffer_wake_time();
> > --
> > 2.34.1
>
> --
> Ville Syrjälä
> Intel
--
Ville Syrjälä
Intel
