Apologies, just want to clarify that I was talking about the frequency fix "[PATCH v1 1/7] i2c-mlxbf.c: Fix frequency calculation". In regards to the below bug fix "[PATCH v1 4/7] i2c-mlxbf.c: incorrect base address passed during io write", we were lucky it works because this write: writel(~0x0, priv->smbus->io + MLXBF_I2C_CAUSE_OR_CLEAR); didn't have any impact on the overall functionality of the read/write transactions. Writing to smbus->io + 0x18 (aka MLXBF_I2C_CAUSE_OR_CLEAR) corresponds to sc_low_timeout register which sets the timeout value before a read/write transaction aborts. -----Original Message----- From: Asmaa Mnebhi Sent: Thursday, August 18, 2022 12:41 PM To: Wolfram Sang <wsa@xxxxxxxxxx> Cc: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>; linux-i2c@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; Khalil Blaiech <kblaiech@xxxxxxxxxx> Subject: RE: [PATCH v1 4/7] i2c-mlxbf.c: incorrect base address passed during io write It only worked on our first generation of BlueField (and we were lucky I think), not in BlueField-2 gen. -----Original Message----- From: Wolfram Sang <wsa@xxxxxxxxxx> Sent: Thursday, August 18, 2022 12:27 PM To: Asmaa Mnebhi <asmaa@xxxxxxxxxx> Cc: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>; linux-i2c@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; Khalil Blaiech <kblaiech@xxxxxxxxxx> Subject: Re: [PATCH v1 4/7] i2c-mlxbf.c: incorrect base address passed during io write On Tue, Aug 16, 2022 at 06:54:09PM -0400, Asmaa Mnebhi wrote: > Correct base address used during io write. So, the driver never ever worked? Or were we lucky that it worked somehow? > > Reviewed-by: Khalil Blaiech <kblaiech@xxxxxxxxxx> > Signed-off-by: Asmaa Mnebhi <asmaa@xxxxxxxxxx> > --- > drivers/i2c/busses/i2c-mlxbf.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/i2c/busses/i2c-mlxbf.c > b/drivers/i2c/busses/i2c-mlxbf.c index 39051c4a6db2..02ed6983c35c > 100644 > --- a/drivers/i2c/busses/i2c-mlxbf.c > +++ b/drivers/i2c/busses/i2c-mlxbf.c > @@ -655,7 +655,7 @@ static int mlxbf_i2c_smbus_enable(struct mlxbf_i2c_priv *priv, u8 slave, > /* Clear status bits. */ > writel(0x0, priv->smbus->io + MLXBF_I2C_SMBUS_MASTER_STATUS); > /* Set the cause data. */ > - writel(~0x0, priv->smbus->io + MLXBF_I2C_CAUSE_OR_CLEAR); > + writel(~0x0, priv->mst_cause->io + MLXBF_I2C_CAUSE_OR_CLEAR); > /* Zero PEC byte. */ > writel(0x0, priv->smbus->io + MLXBF_I2C_SMBUS_MASTER_PEC); > /* Zero byte count. */ > -- > 2.30.1 >
