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i2c: pasemi: Enable the unjam machine

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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 <marcan@marcan.st>
Reviewed-by: Neal Gompa <neal@gompa.dev>
Reviewed-by: Alyssa Rosenzweig <alyssa@rosenzweig.io>
Signed-off-by: Sven Peter <sven@svenpeter.dev>
Link: https://lore.kernel.org/r/20250427-pasemi-fixes-v3-1-af28568296c0@svenpeter.dev
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
This commit is contained in:
Hector Martin 2025-04-27 11:30:43 +00:00 committed by Andi Shyti
parent 25909e19c2
commit 88fe3078b5
1 changed files with 1 additions and 1 deletions
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2
drivers/i2c/busses/i2c-pasemi-core.c
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@ -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;