From: "Levin, Alexander (Sasha Levin)" <alexander.levin@verizon.com>
To: "gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"stable@vger.kernel.org" <stable@vger.kernel.org>
Subject: [GIT PULL for-4.4 19/25] i2c: at91: ensure state is restored after suspending
Date: Wed, 11 Oct 2017 00:45:43 +0000 [thread overview]
Message-ID: <20171011004533.8044-20-alexander.levin@verizon.com> (raw)
In-Reply-To: <20171011004533.8044-1-alexander.levin@verizon.com>
From: Alexandre Belloni <alexandre.belloni@free-electrons.com>
[ Upstream commit e3ccc921b7d8fd1fcd10a00720e09823d8078666 ]
When going to suspend, the I2C registers may be lost because the power to
VDDcore is cut. Restore them when resuming.
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
---
drivers/i2c/busses/i2c-at91.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c
index 10835d1f559b..dee0fc421054 100644
--- a/drivers/i2c/busses/i2c-at91.c
+++ b/drivers/i2c/busses/i2c-at91.c
@@ -1131,6 +1131,7 @@ static int at91_twi_suspend_noirq(struct device *dev)
static int at91_twi_resume_noirq(struct device *dev)
{
+ struct at91_twi_dev *twi_dev = dev_get_drvdata(dev);
int ret;
if (!pm_runtime_status_suspended(dev)) {
@@ -1142,6 +1143,8 @@ static int at91_twi_resume_noirq(struct device *dev)
pm_runtime_mark_last_busy(dev);
pm_request_autosuspend(dev);
+ at91_init_twi_bus(twi_dev);
+
return 0;
}
--
2.11.0
next prev parent reply other threads:[~2017-10-11 0:47 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-11 0:45 [GIT PULL for-4.4 00/25] Commits for v4.4 LTS Levin, Alexander (Sasha Levin)
2017-10-11 0:45 ` [GIT PULL for-4.4 01/25] locking/lockdep: Add nest_lock integrity test Levin, Alexander (Sasha Levin)
2017-10-11 0:45 ` [GIT PULL for-4.4 05/25] mac80211: fix power saving clients handling in iwlwifi Levin, Alexander (Sasha Levin)
2017-10-11 0:45 ` [GIT PULL for-4.4 04/25] mac80211_hwsim: check HWSIM_ATTR_RADIO_NAME length Levin, Alexander (Sasha Levin)
2017-10-11 0:45 ` [GIT PULL for-4.4 03/25] irqchip/crossbar: Fix incorrect type of local variables Levin, Alexander (Sasha Levin)
2017-10-11 0:45 ` [GIT PULL for-4.4 02/25] watchdog: kempld: fix gcc-4.3 build Levin, Alexander (Sasha Levin)
2017-10-11 0:45 ` [GIT PULL for-4.4 07/25] netfilter: nf_ct_expect: Change __nf_ct_expect_check() return value Levin, Alexander (Sasha Levin)
2017-10-11 0:45 ` [GIT PULL for-4.4 09/25] Btrfs: send, fix failure to rename top level inode due to name collision Levin, Alexander (Sasha Levin)
2017-10-11 0:45 ` [GIT PULL for-4.4 06/25] net/mlx4_en: fix overflow in mlx4_en_init_timestamp() Levin, Alexander (Sasha Levin)
2017-10-11 0:45 ` [GIT PULL for-4.4 10/25] f2fs: do not wait for writeback in write_begin Levin, Alexander (Sasha Levin)
2017-10-11 0:45 ` [GIT PULL for-4.4 08/25] iio: adc: xilinx: Fix error handling Levin, Alexander (Sasha Levin)
2017-10-11 0:45 ` [GIT PULL for-4.4 14/25] crypto: xts - Add ECB dependency Levin, Alexander (Sasha Levin)
2017-10-11 0:45 ` [GIT PULL for-4.4 12/25] sparc64: Migrate hvcons irq to panicked cpu Levin, Alexander (Sasha Levin)
2017-10-11 0:45 ` [GIT PULL for-4.4 13/25] net/mlx4_core: Fix VF overwrite of module param which disables DMFS on new probed PFs Levin, Alexander (Sasha Levin)
2017-10-11 0:45 ` [GIT PULL for-4.4 11/25] md/linear: shutup lockdep warnning Levin, Alexander (Sasha Levin)
2017-10-11 0:45 ` [GIT PULL for-4.4 15/25] ocfs2/dlmglue: prepare tracking logic to avoid recursive cluster lock Levin, Alexander (Sasha Levin)
2017-10-11 0:45 ` [GIT PULL for-4.4 18/25] net: mvpp2: release reference to txq_cpu[] entry after unmapping Levin, Alexander (Sasha Levin)
2017-10-11 0:45 ` [GIT PULL for-4.4 16/25] slub: do not merge cache if slub_debug contains a never-merge flag Levin, Alexander (Sasha Levin)
2017-10-11 0:45 ` [GIT PULL for-4.4 17/25] scsi: scsi_dh_emc: return success in clariion_std_inquiry() Levin, Alexander (Sasha Levin)
2017-10-11 0:45 ` [GIT PULL for-4.4 20/25] ceph: clean up unsafe d_parent accesses in build_dentry_path Levin, Alexander (Sasha Levin)
2017-10-11 0:45 ` [GIT PULL for-4.4 21/25] uapi: fix linux/rds.h userspace compilation errors Levin, Alexander (Sasha Levin)
2017-10-11 0:45 ` [GIT PULL for-4.4 22/25] uapi: fix linux/mroute6.h " Levin, Alexander (Sasha Levin)
2017-10-11 0:45 ` Levin, Alexander (Sasha Levin) [this message]
2017-10-11 0:45 ` [GIT PULL for-4.4 24/25] nfsd/callback: Cleanup callback cred on shutdown Levin, Alexander (Sasha Levin)
2017-10-11 0:45 ` [GIT PULL for-4.4 25/25] cpufreq: CPPC: add ACPI_PROCESSOR dependency Levin, Alexander (Sasha Levin)
2017-10-11 0:45 ` [GIT PULL for-4.4 23/25] target/iscsi: Fix unsolicited data seq_end_offset calculation Levin, Alexander (Sasha Levin)
2017-10-19 13:20 ` [GIT PULL for-4.4 00/25] Commits for v4.4 LTS gregkh
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