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drm/i915: Reinstate an early latency==0 check for skl+ 

I thought we could remove all the early latency==0 checks
and rely on skl_wm_method{1,2}() checking for it. But
skl_compute_plane_wm() applies a bunch of workarounds to bump
up the latency before calling those guys so clearly it won't
end up doing the right thing. Also not sure if the calculations
based on the method1/2 results are safe agaisnt overflows so
it might not work all that well in any case. Let's put the
early check back.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181221171436.8218-3-ville.syrjala@linux.intel.com
Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
This commit is contained in:
Ville Syrjälä 2018-12-21 19:14:29 +02:00
parent b52c273be6
commit 692927f4e9
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/i915/intel_pm.c
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@ -4700,6 +4700,9 @@ static void skl_compute_plane_wm(const struct intel_crtc_state *cstate,
to_intel_atomic_state(cstate->base.state);
bool apply_memory_bw_wa = skl_needs_memory_bw_wa(state);
if (latency == 0)
return;
/* Display WA #1141: kbl,cfl */
if ((IS_KABYLAKE(dev_priv) || IS_COFFEELAKE(dev_priv) ||
IS_CNL_REVID(dev_priv, CNL_REVID_A0, CNL_REVID_B0)) &&