diff options
| author | Hector Martin <[email protected]> | 2025-04-27 11:30:43 +0000 |
|---|---|---|
| committer | Andi Shyti <[email protected]> | 2025-05-19 20:23:56 +0000 |
| commit | 88fe3078b54c9efaea7d1adfcf295e37dfb0274f (patch) | |
| tree | 19a8c8eca2a520a2e05c8ce3a779e0528fb10da8 /drivers/i2c | |
| parent | i2c: iproc: Remove unnecessary double negation (diff) | |
| download | kernel-88fe3078b54c9efaea7d1adfcf295e37dfb0274f.tar.gz kernel-88fe3078b54c9efaea7d1adfcf295e37dfb0274f.zip | |
i2c: pasemi: Enable the unjam machine
The I2C bus can get stuck under some conditions (desync between
controller and device). The pasemi controllers include an unjam feature
that is enabled on reset, but was being disabled by the driver. Keep it
enabled by explicitly setting the UJM bit in the CTL register. This
should help recover the bus from certain conditions, which would
otherwise remain stuck forever.
Signed-off-by: Hector Martin <[email protected]>
Reviewed-by: Neal Gompa <[email protected]>
Reviewed-by: Alyssa Rosenzweig <[email protected]>
Signed-off-by: Sven Peter <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Andi Shyti <[email protected]>
Diffstat (limited to 'drivers/i2c')
| -rw-r--r-- | drivers/i2c/busses/i2c-pasemi-core.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/i2c/busses/i2c-pasemi-core.c b/drivers/i2c/busses/i2c-pasemi-core.c index df1b0087dcac..3f5571a90c1d 100644 --- a/drivers/i2c/busses/i2c-pasemi-core.c +++ b/drivers/i2c/busses/i2c-pasemi-core.c @@ -71,7 +71,7 @@ static inline int reg_read(struct pasemi_smbus *smbus, int reg) static void pasemi_reset(struct pasemi_smbus *smbus) { - u32 val = (CTL_MTR | CTL_MRR | (smbus->clk_div & CTL_CLK_M)); + u32 val = (CTL_MTR | CTL_MRR | CTL_UJM | (smbus->clk_div & CTL_CLK_M)); if (smbus->hw_rev >= 6) val |= CTL_EN; |