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drm/i915/gen9: Reject display updates that exceed wm limitations (v2)

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If we can't find any valid level 0 watermark values for the requested
atomic transaction, reject the configuration before we try to start
programming the hardware.

v2:
 - Add extra debugging output when we reject level 0 watermarks so that
   we can more easily debug how/why they were rejected.

Cc: Lyude Paul <cpaul@redhat.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1463061971-19638-17-git-send-email-matthew.d.roper@intel.com
This commit is contained in:
Matt Roper 2016-05-12 07:06:10 -07:00
parent 734fa01f3a
commit 6b6bada7d4
1 changed files with 16 additions and 1 deletions
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17
drivers/gpu/drm/i915/intel_pm.c
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@ -3306,7 +3306,22 @@ static int skl_compute_plane_wm(const struct drm_i915_private *dev_priv,
if (res_blocks >= ddb_allocation || res_lines > 31) {
*enabled = false;
return 0;
/*
* If there are no valid level 0 watermarks, then we can't
* support this display configuration.
*/
if (level) {
return 0;
} else {
DRM_DEBUG_KMS("Requested display configuration exceeds system watermark limitations\n");
DRM_DEBUG_KMS("Plane %d.%d: blocks required = %u/%u, lines required = %u/31\n",
to_intel_crtc(cstate->base.crtc)->pipe,
skl_wm_plane_id(to_intel_plane(pstate->plane)),
res_blocks, ddb_allocation, res_lines);
return -EINVAL;
}
}
*out_blocks = res_blocks;