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path: root/drivers/mfd/db8500-prcmu.c
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Diffstat (limited to 'drivers/mfd/db8500-prcmu.c')
-rw-r--r--drivers/mfd/db8500-prcmu.c32
1 files changed, 28 insertions, 4 deletions
diff --git a/drivers/mfd/db8500-prcmu.c b/drivers/mfd/db8500-prcmu.c
index 95498f80c905..cb58e44b1e45 100644
--- a/drivers/mfd/db8500-prcmu.c
+++ b/drivers/mfd/db8500-prcmu.c
@@ -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__);
}