> -----Original Message----- > From: Hogander, Jouni <jouni.hogander@xxxxxxxxx> > Sent: Friday, May 17, 2024 1:02 PM > To: Shankar, Uma <uma.shankar@xxxxxxxxx>; intel-gfx@xxxxxxxxxxxxxxxxxxxxx > Subject: Re: [PATCH 1/3] drm/i915/psr: LunarLake IO and Fast Wake time line > count maximums are 63 > > On Fri, 2024-05-17 at 06:28 +0000, Shankar, Uma wrote: > > > > > > > -----Original Message----- > > > From: Intel-gfx <intel-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> On Behalf > > > Of Jouni Högander > > > Sent: Friday, May 3, 2024 11:36 AM > > > To: intel-gfx@xxxxxxxxxxxxxxxxxxxxx > > > Cc: Hogander, Jouni <jouni.hogander@xxxxxxxxx> > > > Subject: [PATCH 1/3] drm/i915/psr: LunarLake IO and Fast Wake time > > > line count maximums are 63 > > > > > > On LunarLake maximum for IO and Fast Wake times are 63. Take this > > > into account in calculation and when writing the IO Wake lines. > > > > > > Bspec: 69885, 70294 > > > > > > Signed-off-by: Jouni Högander <jouni.hogander@xxxxxxxxx> > > > --- > > > drivers/gpu/drm/i915/display/intel_psr.c | 5 +++-- > > > 1 file changed, 3 insertions(+), 2 deletions(-) > > > > > > diff --git a/drivers/gpu/drm/i915/display/intel_psr.c > > > b/drivers/gpu/drm/i915/display/intel_psr.c > > > index f5b33335a9ae..678987bbe168 100644 > > > --- a/drivers/gpu/drm/i915/display/intel_psr.c > > > +++ b/drivers/gpu/drm/i915/display/intel_psr.c > > > @@ -1364,8 +1364,9 @@ static bool _compute_alpm_params(struct > > > intel_dp *intel_dp, > > > fast_wake_time = precharge + preamble + phy_wake + > > > tfw_exit_latency; > > > > > > - if (DISPLAY_VER(i915) >= 12) > > > - /* TODO: Check how we can use ALPM_CTL fast wake > > > extended field */ > > > + if (DISPLAY_VER(i915) >= 20) > > > + max_wake_lines = 63; > > > > As per spec, hardware will add 5 extra lines to the programmed value. > > For prior platforms it was set to 12 as 7 (3bits) + 5. I guess we > > should make this consistent. > > Thank you Uma for pointing this out. I have fixed this and the typo you mentioned > on patch 3. Please recheck. Hi Jouni, Looks good, RB'ed now. You can go ahead for merge (seems some unrelated CI failures are there). Regards, Uma Shankar > BR, > > Jouni Högander > > > > Regards, > > Uma Shankar > > > > > + else if (DISPLAY_VER(i915) >= 12) > > > max_wake_lines = 12; > > > else > > > max_wake_lines = 8; > > > -- > > > 2.34.1 > >
