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drm/i915/gen9: Initialize intel_state->active_crtcs during WM sanitization (v2)

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intel_state->active_crtcs is usually only initialized when doing a
modeset.  During our first atomic commit after boot, we're effectively
faking a modeset to sanitize the DDB/wm setup, so ensure that this field
gets initialized before use.

v2:
 - Don't clobber active_crtcs if our first commit really is a modeset
   (Maarten)
 - Grab connection_mutex when faking a modeset during sanitization
   (Maarten)

Reported-by: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Tested-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1466196140-16336-2-git-send-email-matthew.d.roper@intel.com
Cc: stable@vger.kernel.org #v4.7+
(cherry picked from commit 1b54a880b2)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Matt Roper 2016-06-17 13:42:18 -07:00 committed by Jani Nikula
parent fa8410b355
commit f4750a46a0
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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@ -3912,9 +3912,24 @@ skl_compute_ddb(struct drm_atomic_state *state)
* pretend that all pipes switched active status so that we'll
* ensure a full DDB recompute.
*/
if (dev_priv->wm.distrust_bios_wm)
if (dev_priv->wm.distrust_bios_wm) {
ret = drm_modeset_lock(&dev->mode_config.connection_mutex,
state->acquire_ctx);
if (ret)
return ret;
intel_state->active_pipe_changes = ~0;
/*
* We usually only initialize intel_state->active_crtcs if we
* we're doing a modeset; make sure this field is always
* initialized during the sanitization process that happens
* on the first commit too.
*/
if (!intel_state->modeset)
intel_state->active_crtcs = dev_priv->active_crtcs;
}
/*
* If the modeset changes which CRTC's are active, we need to
* recompute the DDB allocation for *all* active pipes, even