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drm/i915/gen9: Drop invalid WARN() during data rate calculation 

It's possible to have a non-zero plane mask and still wind up with a
total data rate of zero.  There are two cases where this can happen:

 * planes are active (from the KMS point of view), but are
   all fully clipped (positioned offscreen)
 * the only active plane on a CRTC is the cursor (which is handled
   independently and not counted into the general data rate computations

These are both valid display setups (although unusual), so we need to
drop the WARN().

Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Testcase: kms_universal_planes.cursor-only-pipe-*
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1466196140-16336-4-git-send-email-matthew.d.roper@intel.com
Cc: stable@vger.kernel.org #v4.7+
(cherry picked from commit 43aa7e8750)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Matt Roper 2016-06-17 13:42:20 -07:00 committed by Jani Nikula
parent f4750a46a0
commit c7aca235aa
1 changed files with 0 additions and 2 deletions
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2
drivers/gpu/drm/i915/intel_pm.c
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@ -3107,8 +3107,6 @@ skl_get_total_relative_data_rate(struct intel_crtc_state *intel_cstate)
total_data_rate += intel_cstate->wm.skl.plane_y_data_rate[id];
}
WARN_ON(cstate->plane_mask && total_data_rate == 0);
return total_data_rate;
}