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mfd: db8500-prcmu tweak for modem wakeup 

This is a tweak for the case where the modem goes to sleep while
emitting the AC_WAKE_ACK anyway. Also print the modem errors as
critical, since they jeopardize the entire platform when they
occur.

Signed-off-by: Mattias Nilsson <mattias.i.nilsson@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Mattias Nilsson 2011-08-12 10:28:43 +02:00 committed by Samuel Ortiz
parent 84165b8059
commit d6e3002e49
1 changed files with 28 additions and 4 deletions
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32
drivers/mfd/db8500-prcmu.c
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@ -1745,6 +1745,7 @@ int prcmu_abb_write(u8 slave, u8 reg, u8 *value, u8 size)
void prcmu_ac_wake_req(void)
{
u32 val;
u32 status;
mutex_lock(&mb0_transfer.ac_wake_lock);
@ -1754,11 +1755,34 @@ void prcmu_ac_wake_req(void)
atomic_set(&ac_wake_req_state, 1);
retry:
writel((val | PRCM_HOSTACCESS_REQ_HOSTACCESS_REQ), PRCM_HOSTACCESS_REQ);
if (!wait_for_completion_timeout(&mb0_transfer.ac_wake_work,
msecs_to_jiffies(20000))) {
pr_err("prcmu: %s timed out (20 s) waiting for a reply.\n",
msecs_to_jiffies(5000))) {
panic("prcmu: %s timed out (5 s) waiting for a reply.\n",
__func__);
goto unlock_and_return;
}
/*
* The modem can generate an AC_WAKE_ACK, and then still go to sleep.
* As a workaround, we wait, and then check that the modem is indeed
* awake (in terms of the value of the PRCM_MOD_AWAKE_STATUS
* register, which may not be the whole truth).
*/
udelay(400);
status = (readl(PRCM_MOD_AWAKE_STATUS) & BITS(0, 2));
if (status != (PRCM_MOD_AWAKE_STATUS_PRCM_MOD_AAPD_AWAKE |
PRCM_MOD_AWAKE_STATUS_PRCM_MOD_COREPD_AWAKE)) {
pr_err("prcmu: %s received ack, but modem not awake (0x%X).\n",
__func__, status);
udelay(1200);
writel(val, PRCM_HOSTACCESS_REQ);
if (wait_for_completion_timeout(&mb0_transfer.ac_wake_work,
msecs_to_jiffies(5000)))
goto retry;
panic("prcmu: %s timed out (5 s) waiting for AC_SLEEP_ACK.\n",
__func__);
}
@ -1783,8 +1807,8 @@ void prcmu_ac_sleep_req()
PRCM_HOSTACCESS_REQ);
if (!wait_for_completion_timeout(&mb0_transfer.ac_wake_work,
msecs_to_jiffies(20000))) {
pr_err("prcmu: %s timed out (20 s) waiting for a reply.\n",
msecs_to_jiffies(5000))) {
panic("prcmu: %s timed out (5 s) waiting for a reply.\n",
__func__);
}