Commit 88fe3078 authored by Hector Martin's avatar Hector Martin Committed by Andi Shyti
Browse files

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: default avatarHector Martin <marcan@marcan.st>
Reviewed-by: default avatarNeal Gompa <neal@gompa.dev>
Reviewed-by: default avatarAlyssa Rosenzweig <alyssa@rosenzweig.io>
Signed-off-by: default avatarSven Peter <sven@svenpeter.dev>
Link: https://lore.kernel.org/r/20250427-pasemi-fixes-v3-1-af28568296c0@svenpeter.dev


Signed-off-by: default avatarAndi Shyti <andi.shyti@kernel.org>
parent 25909e19

drivers/i2c/busses/i2c-pasemi-core.c

+1 −1
Original line number Diff line number Diff line
@@ -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;