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slimbus: Reset data channels for a controller when framer reboots 

Framer is responsible for clocking slimbus, and when it reboots, state
of all associated data channels is reset to be consistent with HW
state.

Change-Id: Ie74ace2b20ad6c255440ff6ce593f7d5503bf388
Signed-off-by: Sagar Dharia <sdharia@codeaurora.org>
This commit is contained in:
Sagar Dharia 2016-01-06 22:11:31 -07:00 committed by Gerrit - the friendly Code Review server
parent 836c5cb226
commit a404cc5d84
1 changed files with 17 additions and 1 deletions
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18
drivers/slimbus/slimbus.c
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@ -1,4 +1,4 @@
/* Copyright (c) 2011-2015, The Linux Foundation. All rights reserved.
/* Copyright (c) 2011-2016, 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
@ -641,6 +641,7 @@ void slim_report_absent(struct slim_device *sbdev)
}
EXPORT_SYMBOL(slim_report_absent);
static int slim_remove_ch(struct slim_controller *ctrl, struct slim_ich *slc);
/*
* slim_framer_booted: This function is called by controller after the active
* framer has booted (using Bus Reset sequence, or after it has shutdown and has
@ -653,8 +654,20 @@ void slim_framer_booted(struct slim_controller *ctrl)
{
struct slim_device *sbdev;
struct list_head *pos, *next;
int i;
if (!ctrl)
return;
/* Since framer has rebooted, reset all data channels */
mutex_lock(&ctrl->sched.m_reconf);
for (i = 0; i < ctrl->nchans; i++) {
struct slim_ich *slc = &ctrl->chans[i];
if (slc->state > SLIM_CH_DEFINED)
slim_remove_ch(ctrl, slc);
}
mutex_unlock(&ctrl->sched.m_reconf);
mutex_lock(&ctrl->m_ctrl);
list_for_each_safe(pos, next, &ctrl->devs) {
struct slim_driver *sbdrv;
@ -1665,6 +1678,7 @@ static int slim_remove_ch(struct slim_controller *ctrl, struct slim_ich *slc)
arr[*len] = NULL;
slc->state = SLIM_CH_ALLOCATED;
slc->def = 0;
slc->newintr = 0;
slc->newoff = 0;
for (i = 0; i < slc->nsink; i++) {
@ -3096,6 +3110,7 @@ int slim_control_ch(struct slim_device *sb, u16 chanh,
return -EINVAL;
mutex_lock(&sb->sldev_reconf);
mutex_lock(&ctrl->sched.m_reconf);
do {
struct slim_pending_ch *pch;
u8 add_mark_removal = true;
@ -3154,6 +3169,7 @@ int slim_control_ch(struct slim_device *sb, u16 chanh,
if (nchan < SLIM_GRP_TO_NCHAN(chanh))
chan = SLIM_HDL_TO_CHIDX(slc->nextgrp);
} while (nchan < SLIM_GRP_TO_NCHAN(chanh));
mutex_unlock(&ctrl->sched.m_reconf);
if (!ret && commit == true)
ret = slim_reconfigure_now(sb);
mutex_unlock(&sb->sldev_reconf);