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msm: mdss: mdp: fix handling of GDSC off notifier

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In the current implementation, MDP driver registers for MDSS
GDSC notifier and attempts to halt any active VBIF transactions
whenever the MDSS GDSC is turned off. This results in a call to
the bus driver to remove any active bus bandwidth vote. However,
it is possible that notifier call could be a result MDSS GDSC
being turned off by the bus driver during probe time and calling
back in to the bus driver can result in a deadlock. Avoid this
by handling GDSC off notifier only if there are any active
overlay sessions.

Change-Id: Id53a790cf67b201a4207f85604cb3472275d418a
Signed-off-by: Aravind Venkateswaran <aravindh@codeaurora.org>
This commit is contained in:
Aravind Venkateswaran 2016-07-11 18:19:04 -07:00
parent aa958278d1
commit a5312f6f7f
1 changed files with 10 additions and 3 deletions
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13
drivers/video/fbdev/msm/mdss_mdp.c
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@ -1638,9 +1638,16 @@ static int mdss_mdp_gdsc_notifier_call(struct notifier_block *self,
if (event & REGULATOR_EVENT_ENABLE) {
__mdss_restore_sec_cfg(mdata);
} else if (event & REGULATOR_EVENT_PRE_DISABLE) {
pr_debug("mdss gdsc is getting disabled\n");
/* halt the vbif transactions */
mdss_mdp_vbif_axi_halt(mdata);
int active_cnt = atomic_read(&mdata->active_intf_cnt);
pr_debug("mdss gdsc is getting disabled, active_cnt=%d\n",
active_cnt);
/*
* halt the vbif transactions only if we have any active
* overlay session
*/
if (active_cnt)
mdss_mdp_vbif_axi_halt(mdata);
}
return NOTIFY_OK;