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authorJan Glauber <jglauber@cavium.com>2016-12-09 12:31:55 +0300
committerWolfram Sang <wsa@the-dreams.de>2016-12-12 00:58:34 +0300
commitccee1a4cdcd02e748d39d2b121f7f82041893121 (patch)
tree835d8c1535e2483f6721df6543d0620f000e1bb6 /drivers/i2c
parentf8989783d7a4b076cf11eea1347ed068ff4c2c77 (diff)
downloadlinux-ccee1a4cdcd02e748d39d2b121f7f82041893121.tar.xz
i2c: octeon: thunderx: TWSI software reset in recovery
I've seen i2c recovery reporting long loops of: [ 1035.887818] i2c i2c-4: SCL is stuck low, exit recovery [ 1037.999748] i2c i2c-4: SCL is stuck low, exit recovery [ 1040.111694] i2c i2c-4: SCL is stuck low, exit recovery ... Add a TWSI software reset which clears the status and STA,STP,IFLG in SW_TWSI_EOP_TWSI_CTL. With this the recovery works fine and above message is not seen. Signed-off-by: Jan Glauber <jglauber@cavium.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/busses/i2c-octeon-core.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-octeon-core.c b/drivers/i2c/busses/i2c-octeon-core.c
index 419b54bfc7c7..0b020703017d 100644
--- a/drivers/i2c/busses/i2c-octeon-core.c
+++ b/drivers/i2c/busses/i2c-octeon-core.c
@@ -791,6 +791,9 @@ static void octeon_i2c_prepare_recovery(struct i2c_adapter *adap)
struct octeon_i2c *i2c = i2c_get_adapdata(adap);
octeon_i2c_hlc_disable(i2c);
+ octeon_i2c_reg_write(i2c, SW_TWSI_EOP_TWSI_RST, 0);
+ /* wait for software reset to settle */
+ udelay(5);
/*
* Bring control register to a good state regardless