drm/i915: Calculate ironlake intermediate watermarks correctly, v2.
authorMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Thu, 19 Oct 2017 15:13:41 +0000 (17:13 +0200)
committerJani Nikula <jani.nikula@intel.com>
Thu, 9 Nov 2017 14:18:21 +0000 (16:18 +0200)
commit90c702b88e5b5bbe2be53848aa3aba7c2b64223f
tree26169424269369eeb04472052b61aed01fff8e12
parentb58d4bef1070c6ca57008756d86f79a687d2bbea
drm/i915: Calculate ironlake intermediate watermarks correctly, v2.

The watermarks it should calculate against are the old optimal watermarks.
The currently active crtc watermarks are pure fiction, and are invalid in
case of a nonblocking modeset, page flip enabling/disabling planes or any
other reason.

When the crtc is disabled or during a modeset the intermediate watermarks
don't need to be programmed separately, and could be directly assigned
to the optimal watermarks.

Changes since v1:
- Use intel_atomic_get_old_crtc_state. (ville)

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171019151341.4579-2-maarten.lankhorst@linux.intel.com
[mlankhorst: Add cc stable and bugzilla link, since previous patch doesn't fix issue by itself]
Cc: stable@vger.kernel.org #v4.8+
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=102373
(cherry picked from commit b6b178a77210055b153dbc175e4468bd3c7122df)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
drivers/gpu/drm/i915/intel_pm.c