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drm/i915: fix the transition minimums for gen9+ watermarks
author
Paulo Zanoni
<paulo.r.zanoni@intel.com>
Thu, 4 Oct 2018 23:15:56 +0000
(16:15 -0700)
committer
Paulo Zanoni
<paulo.r.zanoni@intel.com>
Thu, 11 Oct 2018 21:23:03 +0000
(14:23 -0700)
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
drivers/gpu/drm/i915/intel_pm.c
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diff --git
a/drivers/gpu/drm/i915/intel_pm.c
b/drivers/gpu/drm/i915/intel_pm.c
index
1392aa5
..
983af46
100644
(file)
--- a/
drivers/gpu/drm/i915/intel_pm.c
+++ b/
drivers/gpu/drm/i915/intel_pm.c
@@
-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) >= 1
0
)
+ trans_min =
14
;
+ if (INTEL_GEN(dev_priv) >= 1
1
)
trans_min = 4;
trans_offset_b = trans_min + trans_amount;