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Commit 84fd648f authored by Jayant Shekhar's avatar Jayant Shekhar
Browse files

msm: mdss: Prevent race condition between dsi off and bta status check 



fb_event_callback() is what is responsible for cancelling the
delayed_work when it gets the FB_BLANK_POWERDOWN event. However,
this event occurs after the panel & DSI have been turned off. So
if the check_status function was being called right when the panel
is being turned off, we have a race conditon. Hence check
shutdown flag to avoid bta status check when dsi is being turned off.

Change-Id: I103bafb4ab63be83c47dfd6b3bad06d36704ff68
Signed-off-by: default avatarJayant Shekhar <jshekhar@codeaurora.org>
parent 9b42cc28

drivers/video/msm/mdss/mdss_dsi_status.c

+10 −1
Original line number Diff line number Diff line 
/* Copyright (c) 2013, The Linux Foundation. All rights reserved.

/* Copyright (c) 2013-2014, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and
@@ -86,6 +86,15 @@ static void check_dsi_ctrl_status(struct work_struct *work) 
		mutex_lock(ctl->shared_lock);

	mutex_lock(&mdp5_data->ov_lock);



	if (pdsi_status->mfd->shutdown_pending) {

		mutex_unlock(&mdp5_data->ov_lock);

		if (ctl->shared_lock)

			mutex_unlock(ctl->shared_lock);

		pr_err("%s: DSI turning off, avoiding BTA status check\n",

							__func__);

		return;

	}



	/*

	 * For the command mode panels, we return pan display

	 * IOCTL on vsync interrupt. So, after vsync interrupt comes