evie/android_kernel_oneplus_msm8998
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mhi: core: Ring out pending doorbells

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Ring out pending doorbells in the event of a cancelled M3 transition
attempt.

Change-Id: I83ffe0407618ea26768707fc6341d20947ef3ba2
Signed-off-by: Andrei Danaila <adanaila@codeaurora.org>
This commit is contained in:
Andrei Danaila 2015-02-18 17:23:50 -08:00 • committed by David Keitel
parent 91fd082145
commit c84885de9a
1 changed files with 13 additions and 2 deletions
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15
drivers/platform/msm/mhi/mhi_states.c
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@ -1,4 +1,4 @@
/* Copyright (c) 2014, The Linux Foundation. All rights reserved.
/* Copyright (c) 2014-2015, 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
@ -950,6 +950,7 @@ int mhi_initiate_m3(struct mhi_device_ctxt *mhi_dev_ctxt)
unsigned long flags;
int r;
int abort_m3 = 0;
mhi_log(MHI_MSG_INFO,
"Entered MHI state %d, Pending M0 %d Pending M3 %d\n",
@ -1007,11 +1008,14 @@ int mhi_initiate_m3(struct mhi_device_ctxt *mhi_dev_ctxt)
atomic_read(&mhi_dev_ctxt->counters.outbound_acks));
__pm_stay_awake(&mhi_dev_ctxt->w_lock);
__pm_relax(&mhi_dev_ctxt->w_lock);
abort_m3 = 1;
goto exit;
}
if (atomic_read(&mhi_dev_ctxt->flags.data_pending))
if (atomic_read(&mhi_dev_ctxt->flags.data_pending)) {
abort_m3 = 1;
goto exit;
}
r = hrtimer_cancel(&mhi_dev_ctxt->m1_timer);
if (r)
mhi_log(MHI_MSG_INFO, "Cancelled M1 timer, timer was active\n");
@ -1061,6 +1065,13 @@ int mhi_initiate_m3(struct mhi_device_ctxt *mhi_dev_ctxt)
if (r)
mhi_log(MHI_MSG_INFO, "Failed to set bus freq ret %d\n", r);
exit:
if (abort_m3) {
write_lock_irqsave(&mhi_dev_ctxt->xfer_lock, flags);
atomic_inc(&mhi_dev_ctxt->flags.data_pending);
write_unlock_irqrestore(&mhi_dev_ctxt->xfer_lock, flags);
ring_all_chan_dbs(mhi_dev_ctxt);
atomic_dec(&mhi_dev_ctxt->flags.data_pending);
}
atomic_set(&mhi_dev_ctxt->flags.m3_work_enabled, 0);
mhi_dev_ctxt->flags.pending_M3 = 0;
mutex_unlock(&mhi_dev_ctxt->pm_lock);