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drm/i915/gen9: implement missing case for SKL watermarks calculation

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This should affect linear and X tiled planes on really small htotal
cases. It doesn't seem to be a very feasible case, but let's implement
it since it's on the specification and it's better to have it and
never need than not have it and realize we needed it.

Reviewed-by: Lyude <cpaul@redhat.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Paulo Zanoni <paulo.r.zanoni@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1474578035-424-9-git-send-email-paulo.r.zanoni@intel.com
This commit is contained in:
Paulo Zanoni
2016-09-22 18:00:34 -03:00
parent 75676ed423
commit f1db3eafe5
1 changed files with 4 additions and 1 deletions
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drivers/gpu/drm/i915/intel_pm.c
+4 -1
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@@ -3615,7 +3615,10 @@ static int skl_compute_plane_wm(const struct drm_i915_private *dev_priv,
fb->modifier[0] == I915_FORMAT_MOD_Yf_TILED) {
selected_result = max(method2, y_tile_minimum);
} else {
if ((ddb_allocation / plane_blocks_per_line) >= 1)
if ((cpp * cstate->base.adjusted_mode.crtc_htotal / 512 < 1) &&
(plane_bytes_per_line / 512 < 1))
selected_result = method2;
else if ((ddb_allocation / plane_blocks_per_line) >= 1)
selected_result = min(method1, method2);
else
selected_result = method1;