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drm/i915: fix the transition minimums for gen9+ watermarks 

The transition minimum is 14 blocks for gens 9 and 10, and 4 blocks
for gen 11. This minimum value is supposed to be added to the
configurable trans_amount. This matches both BSpec and additional
information provided by our HW engineers.

Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181004231600.14101-3-paulo.r.zanoni@intel.com
This commit is contained in:
Paulo Zanoni 2018-10-04 16:15:56 -07:00
parent ef51e0a3eb
commit 91961a850d
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/i915/intel_pm.c
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@ -4875,8 +4875,8 @@ static void skl_compute_transition_wm(struct intel_crtc_state *cstate,
if (!dev_priv->ipc_enabled)
goto exit;
trans_min = 0;
if (INTEL_GEN(dev_priv) >= 10)
trans_min = 14;
if (INTEL_GEN(dev_priv) >= 11)
trans_min = 4;
trans_offset_b = trans_min + trans_amount;