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authorArun Murthy <arun.murthy@stericsson.com>2012-05-21 12:58:21 +0400
committerSamuel Ortiz <sameo@linux.intel.com>2012-07-09 02:16:10 +0400
commit5261e101198e7ef31a60d3aa97815a49c8b8fa20 (patch)
tree53e8157eaceb4c6448b8ca15c73368e5a04185d3 /drivers/mfd/db8500-prcmu.c
parent19d57ed5a308472a02e773f33c03ad4cb2ec6a9d (diff)
downloadlinux-5261e101198e7ef31a60d3aa97815a49c8b8fa20.tar.xz
mfd: Update db8500-prmcu hostport_access enable
Force the Modem wakeup by asserting the CaWakeReq signal before the hostaccess_req/ack ping-pong sequence. The Awake_req signal is de-asserted asserted at the same time than the hostaccess_req. Return error on failure case so that the client using this can take appropiate steps. Signed-off-by: Arun Murthy <arun.murthy@stericsson.com> Acked-by: Linus Walleij <linus.walleij@stericsson.com> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/mfd/db8500-prcmu.c')
-rw-r--r--drivers/mfd/db8500-prcmu.c45
1 files changed, 19 insertions, 26 deletions
diff --git a/drivers/mfd/db8500-prcmu.c b/drivers/mfd/db8500-prcmu.c
index bf5a054a2b91..f4adcabb2a51 100644
--- a/drivers/mfd/db8500-prcmu.c
+++ b/drivers/mfd/db8500-prcmu.c
@@ -2269,10 +2269,10 @@ int prcmu_abb_write(u8 slave, u8 reg, u8 *value, u8 size)
/**
* prcmu_ac_wake_req - should be called whenever ARM wants to wakeup Modem
*/
-void prcmu_ac_wake_req(void)
+int prcmu_ac_wake_req(void)
{
u32 val;
- u32 status;
+ int ret = 0;
mutex_lock(&mb0_transfer.ac_wake_lock);
@@ -2282,39 +2282,32 @@ void prcmu_ac_wake_req(void)
atomic_set(&ac_wake_req_state, 1);
-retry:
- writel((val | PRCM_HOSTACCESS_REQ_HOSTACCESS_REQ), PRCM_HOSTACCESS_REQ);
+ /*
+ * Force Modem Wake-up before hostaccess_req ping-pong.
+ * It prevents Modem to enter in Sleep while acking the hostaccess
+ * request. The 31us delay has been calculated by HWI.
+ */
+ val |= PRCM_HOSTACCESS_REQ_WAKE_REQ;
+ writel(val, PRCM_HOSTACCESS_REQ);
+
+ udelay(31);
+
+ val |= PRCM_HOSTACCESS_REQ_HOSTACCESS_REQ;
+ writel(val, PRCM_HOSTACCESS_REQ);
if (!wait_for_completion_timeout(&mb0_transfer.ac_wake_work,
msecs_to_jiffies(5000))) {
+#if defined(CONFIG_DBX500_PRCMU_DEBUG)
+ db8500_prcmu_debug_dump(__func__, true, true);
+#endif
pr_crit("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;
- pr_crit("prcmu: %s timed out (5 s) waiting for AC_SLEEP_ACK.\n",
- __func__);
+ ret = -EFAULT;
}
unlock_and_return:
mutex_unlock(&mb0_transfer.ac_wake_lock);
+ return ret;
}
/**