Hi Guenter, Thanks for the pointer. Actually during bmr454 probing during kernel boots-up it called system reset/crash. For reference please find bmr454 probing log below: [ 14.910630] pmbus 7-0010: bmr454 BMR status word : 0x2 [ 14.922945] pmbus 7-0010: bmr454 BMR status cml : 0x2 ---> Immediately after above bmr454 probing it reset/crash the system and jump to u-boot. Using debug prints I observed system got resettted after reaching to _pmbus_write_byte function. But sometimes probing is fine, not observing any system reset/crash. Regards, Pankaj Pandey On Wed, Aug 30, 2023 at 7:38 AM Guenter Roeck <linux@xxxxxxxxxxxx> wrote: > > On Wed, Aug 30, 2023 at 07:16:46AM +0530, Pankaj Pandey wrote: > > ---------- Forwarded message --------- > > From: Pankaj Pandey <pankaj.embedded@xxxxxxxxx> > > Date: Wed, Aug 30, 2023 at 4:42 AM > > Subject: Regarding pmbus_core.c > > To: <linux@xxxxxxxxxxxx> > > > > > > Hi Guenter Roeck, > > > > I am facing an issue at drivers/hwmon/pmbus/pmbus_core.c of linux-5.10 kernel. > > I am using the bm454 driver from drivers/hwmon/pmbus/pmbus.c. > > Observed sometimes my Powepc based target board called for reset from > > inside int pmbus_write_byte_data(struct i2c_client *client, int page, > > u8 reg, u8 value) function. It is not consistent, sometimes not > > Sorry, I don't understand what you mean with "called for reset from > inside int pmbus_write_byte_data". Please clarify. > > If I recall correctly, bmr454 is very picky when it comes to i2c bus > speed. If it acts up, you might have some success with picking a different > bus speed. > > Thanks, > Guenter > > > observed any reset and bmr454 initialized fine. Please suggest any > > pointers to debug this issue. > > > > Regards, > > Pankaj Pandey
