From: manishv.b@ti.com (Vishwanathrao Badarkhe, Manish)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH RFC] davinci: poll for sleep completion in resume routine.
Date: Thu, 31 Jan 2013 14:53:41 +0530 [thread overview]
Message-ID: <1359624221-5378-1-git-send-email-manishv.b@ti.com> (raw)
As per OMAP-L138 TRM, Software must poll for
SLEEPCOMPLETE bit until it is set to 1 before clearing
SLEEPENABLE bit in DEEPSLEEP register in resume routine.
Modifications are as per datasheet:
http://www.ti.com/lit/ug/spruh77a/spruh77a.pdf
See sections 10.10.2.2 and 11.5.21 for more detailed
explanation.
Tested on da850-evm.
Signed-off-by: Vishwanathrao Badarkhe, Manish <manishv.b@ti.com>
---
:100644 100644 d4e9316... 976f096... M arch/arm/mach-davinci/sleep.S
arch/arm/mach-davinci/sleep.S | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/arch/arm/mach-davinci/sleep.S b/arch/arm/mach-davinci/sleep.S
index d4e9316..976f096 100644
--- a/arch/arm/mach-davinci/sleep.S
+++ b/arch/arm/mach-davinci/sleep.S
@@ -35,6 +35,7 @@
#define PLL_LOCK_CYCLES (PLL_LOCK_TIME * 25)
#define DEEPSLEEP_SLEEPENABLE_BIT BIT(31)
+#define DEEPSLEEP_SLEEPCOMPLETE_BIT BIT(30)
.text
/*
@@ -110,6 +111,13 @@ ENTRY(davinci_cpu_suspend)
/* Wake up from sleep */
+ /* wait for sleep complete */
+sleep_complete:
+ ldr ip, [r4]
+ and ip, ip, #DEEPSLEEP_SLEEPCOMPLETE_BIT
+ cmp ip, #DEEPSLEEP_SLEEPCOMPLETE_BIT
+ bne sleep_complete
+
/* Clear sleep enable */
ldr ip, [r4]
bic ip, ip, #DEEPSLEEP_SLEEPENABLE_BIT
--
1.7.4.1
next reply other threads:[~2013-01-31 9:23 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-01-31 9:23 Vishwanathrao Badarkhe, Manish [this message]
-- strict thread matches above, loose matches on Subject: below --
2013-01-31 9:26 [PATCH RFC] davinci: poll for sleep completion in resume routine Vishwanathrao Badarkhe, Manish
2013-01-31 9:51 ` Sekhar Nori
2013-01-31 10:11 ` Vishwanathrao Badarkhe, Manish
2013-02-14 4:18 ` Sekhar Nori
2013-02-14 5:16 ` Vishwanathrao Badarkhe, Manish
2013-02-14 6:59 ` Sekhar Nori
2013-02-14 8:52 ` Vishwanathrao Badarkhe, Manish
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1359624221-5378-1-git-send-email-manishv.b@ti.com \
--to=manishv.b@ti.com \
--cc=linux-arm-kernel@lists.infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox