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From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: linux-kernel@vger.kernel.org
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	stable@vger.kernel.org,
	Chris Packham <chris.packham@alliedtelesis.co.nz>,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	Wolfram Sang <wsa@kernel.org>, Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.4 13/19] i2c: algo-pca: Add 0x78 as SCL stuck low status for PCA9665
Date: Tue,  7 Jul 2020 17:10:16 +0200	[thread overview]
Message-ID: <20200707145748.169742260@linuxfoundation.org> (raw)
In-Reply-To: <20200707145747.493710555@linuxfoundation.org>

From: Chris Packham <chris.packham@alliedtelesis.co.nz>

[ Upstream commit cd217f2300793a106b49c7dfcbfb26e348bc7593 ]

The PCA9665 datasheet says that I2CSTA = 78h indicates that SCL is stuck
low, this differs to the PCA9564 which uses 90h for this indication.
Treat either 0x78 or 0x90 as an indication that the SCL line is stuck.

Based on looking through the PCA9564 and PCA9665 datasheets this should
be safe for both chips. The PCA9564 should not return 0x78 for any valid
state and the PCA9665 should not return 0x90.

Fixes: eff9ec95efaa ("i2c-algo-pca: Add PCA9665 support")
Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/i2c/algos/i2c-algo-pca.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/algos/i2c-algo-pca.c b/drivers/i2c/algos/i2c-algo-pca.c
index e370804ec8bc6..3a9db4626cb60 100644
--- a/drivers/i2c/algos/i2c-algo-pca.c
+++ b/drivers/i2c/algos/i2c-algo-pca.c
@@ -326,7 +326,8 @@ static int pca_xfer(struct i2c_adapter *i2c_adap,
 			DEB2("BUS ERROR - SDA Stuck low\n");
 			pca_reset(adap);
 			goto out;
-		case 0x90: /* Bus error - SCL stuck low */
+		case 0x78: /* Bus error - SCL stuck low (PCA9665) */
+		case 0x90: /* Bus error - SCL stuck low (PCA9564) */
 			DEB2("BUS ERROR - SCL Stuck low\n");
 			pca_reset(adap);
 			goto out;
-- 
2.25.1




  parent reply	other threads:[~2020-07-07 15:10 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-07 15:10 [PATCH 4.4 00/19] 4.4.230-rc1 review Greg Kroah-Hartman
2020-07-07 15:10 ` [PATCH 4.4 01/19] btrfs: cow_file_range() num_bytes and disk_num_bytes are same Greg Kroah-Hartman
2020-07-07 15:10 ` [PATCH 4.4 02/19] btrfs: fix data block group relocation failure due to concurrent scrub Greg Kroah-Hartman
2020-07-07 15:10 ` [PATCH 4.4 03/19] mm: fix swap cache node allocation mask Greg Kroah-Hartman
2020-07-07 15:10 ` [PATCH 4.4 04/19] EDAC/amd64: Read back the scrub rate PCI register on F15h Greg Kroah-Hartman
2020-07-07 15:10 ` [PATCH 4.4 05/19] mm/slub: fix stack overruns with SLUB_STATS Greg Kroah-Hartman
2020-07-07 15:10 ` [PATCH 4.4 06/19] usb: usbtest: fix missing kfree(dev->buf) in usbtest_disconnect Greg Kroah-Hartman
2020-07-07 15:10 ` [PATCH 4.4 07/19] kgdb: Avoid suspicious RCU usage warning Greg Kroah-Hartman
2020-07-07 15:10 ` [PATCH 4.4 08/19] crypto: af_alg - fix use-after-free in af_alg_accept() due to bh_lock_sock() Greg Kroah-Hartman
2020-07-07 15:10 ` [PATCH 4.4 09/19] sched/rt: Show the sched_rr_timeslice SCHED_RR timeslice tuning knob in milliseconds Greg Kroah-Hartman
2020-07-07 15:10 ` [PATCH 4.4 10/19] hwmon: (max6697) Make sure the OVERT mask is set correctly Greg Kroah-Hartman
2020-07-07 15:10 ` [PATCH 4.4 11/19] hwmon: (acpi_power_meter) Fix potential memory leak in acpi_power_meter_add() Greg Kroah-Hartman
2020-07-07 15:10 ` [PATCH 4.4 12/19] virtio-blk: free vblk-vqs in error path of virtblk_probe() Greg Kroah-Hartman
2020-07-07 15:10 ` Greg Kroah-Hartman [this message]
2020-07-07 15:10 ` [PATCH 4.4 14/19] Revert "ALSA: usb-audio: Improve frames size computation" Greg Kroah-Hartman
2020-07-07 15:13   ` Takashi Iwai
2020-07-07 15:17     ` Greg Kroah-Hartman
2020-07-07 15:10 ` [PATCH 4.4 15/19] SMB3: Honor seal flag for multiuser mounts Greg Kroah-Hartman
2020-07-07 15:10 ` [PATCH 4.4 16/19] SMB3: Honor persistent/resilient handle flags " Greg Kroah-Hartman
2020-07-07 15:10 ` [PATCH 4.4 17/19] cifs: Fix the target file was deleted when rename failed Greg Kroah-Hartman
2020-07-07 15:10 ` [PATCH 4.4 18/19] MIPS: Add missing EHB in mtc0 -> mfc0 sequence for DSPen Greg Kroah-Hartman
2020-07-07 15:10 ` [PATCH 4.4 19/19] netfilter: nf_conntrack_h323: lost .data_len definition for Q.931/ipv6 Greg Kroah-Hartman
2020-07-08  7:00 ` [PATCH 4.4 00/19] 4.4.230-rc1 review Naresh Kamboju
2020-07-08  8:39 ` Jon Hunter
2020-07-08 10:40 ` Chris Paterson
2020-07-08 15:18 ` Shuah Khan
2020-07-08 17:51 ` Guenter Roeck

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