linux-kernel - RE: [PATCH] i2c: aspeed: Update the stop sw state when the bus recovry occurs

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Date: Tue, 11 Jun 2024 00:33:50 +0000
From: Tommy Huang <tommy_huang@...eedtech.com>
To: Andi Shyti <andi.shyti@...nel.org>
CC: "brendan.higgins@...ux.dev" <brendan.higgins@...ux.dev>,
	"benh@...nel.crashing.org" <benh@...nel.crashing.org>, "joel@....id.au"
	<joel@....id.au>, "andrew@...econstruct.com.au"
	<andrew@...econstruct.com.au>, "wsa@...nel.org" <wsa@...nel.org>,
	"linux-i2c@...r.kernel.org" <linux-i2c@...r.kernel.org>,
	"openbmc@...ts.ozlabs.org" <openbmc@...ts.ozlabs.org>,
	"linux-arm-kernel@...ts.infradead.org"
	<linux-arm-kernel@...ts.infradead.org>, "linux-aspeed@...ts.ozlabs.org"
	<linux-aspeed@...ts.ozlabs.org>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>, BMC-SW <BMC-SW@...eedtech.com>
Subject: RE: [PATCH] i2c: aspeed: Update the stop sw state when the bus
 recovry occurs

Hi Andi,

	There is a problem to move aspeed_i2c_do_stop() on top.
	This function is like with aspeed_i2c_reset function needs the aspeed_i2c_bus structure definition.

	BR,

	By Tommy

> -----Original Message-----
> From: Tommy Huang <tommy_huang@...eedtech.com>
> Sent: Saturday, June 8, 2024 12:38 PM
> To: Andi Shyti <andi.shyti@...nel.org>
> Cc: brendan.higgins@...ux.dev; benh@...nel.crashing.org; joel@....id.au;
> andrew@...econstruct.com.au; wsa@...nel.org; linux-i2c@...r.kernel.org;
> openbmc@...ts.ozlabs.org; linux-arm-kernel@...ts.infradead.org;
> linux-aspeed@...ts.ozlabs.org; linux-kernel@...r.kernel.org; BMC-SW
> <BMC-SW@...eedtech.com>
> Subject: RE: [PATCH] i2c: aspeed: Update the stop sw state when the bus
> recovry occurs
> 
> Hi Andi,
> 
> > -----Original Message-----
> > From: Andi Shyti <andi.shyti@...nel.org>
> > Sent: Thursday, June 6, 2024 9:27 AM
> > To: Tommy Huang <tommy_huang@...eedtech.com>
> > Cc: brendan.higgins@...ux.dev; benh@...nel.crashing.org;
> > joel@....id.au; andrew@...econstruct.com.au; wsa@...nel.org;
> > linux-i2c@...r.kernel.org; openbmc@...ts.ozlabs.org;
> > linux-arm-kernel@...ts.infradead.org;
> > linux-aspeed@...ts.ozlabs.org; linux-kernel@...r.kernel.org; BMC-SW
> > <BMC-SW@...eedtech.com>
> > Subject: Re: [PATCH] i2c: aspeed: Update the stop sw state when the
> > bus recovry occurs
> >
> > Hi Tommy,
> >
> > On Thu, May 30, 2024 at 03:06:56PM +0800, Tommy Huang wrote:
> > > When the i2c bus recovey occurs, driver will send i2c stop command
> > > in the scl low condition. In this case the sw state will still keep
> > > original situation. Under multi-master usage, i2c bus recovery will
> > > be called when i2c transfer timeout occurs. Update the stop command
> > > calling with aspeed_i2c_do_stop function to update master_state.
> > >
> > > Fixes: f327c686d3ba ("i2c: aspeed: added driver for Aspeed I2C")
> > >
> > > Signed-off-by: Tommy Huang <tommy_huang@...eedtech.com>
> >
> > Can you please add:
> >
> > Cc: <stable@...r.kernel.org> # v4.13+
> 
> Got it. I will add it.
> 
> >
> > > ---
> > >  drivers/i2c/busses/i2c-aspeed.c | 3 ++-
> > >  1 file changed, 2 insertions(+), 1 deletion(-)
> > >
> > > diff --git a/drivers/i2c/busses/i2c-aspeed.c
> > > b/drivers/i2c/busses/i2c-aspeed.c index ce8c4846b7fa..32f8b0c1c174
> > > 100644
> > > --- a/drivers/i2c/busses/i2c-aspeed.c
> > > +++ b/drivers/i2c/busses/i2c-aspeed.c
> > > @@ -169,6 +169,7 @@ struct aspeed_i2c_bus {  };
> > >
> > >  static int aspeed_i2c_reset(struct aspeed_i2c_bus *bus);
> > > +static void aspeed_i2c_do_stop(struct aspeed_i2c_bus *bus);
> >
> > Can you please move aspeed_i2c_do_stop() on top? Doesn't make much
> > sense to add the prototype here as there is no dependencies.
> 
> Sure. I will update it.
> 
> >
> > It's different the case of aspeed_i2c_reset() because it needs
> aspeed_i2c_init().
> >
> > >  static int aspeed_i2c_recover_bus(struct aspeed_i2c_bus *bus)  { @@
> > > -187,7 +188,7 @@ static int aspeed_i2c_recover_bus(struct
> > > aspeed_i2c_bus
> > *bus)
> > >  			command);
> > >
> > >  		reinit_completion(&bus->cmd_complete);
> > > -		writel(ASPEED_I2CD_M_STOP_CMD, bus->base +
> > ASPEED_I2C_CMD_REG);
> > > +		aspeed_i2c_do_stop(bus);
> >
> > The patch is good, though!
> >
> 
> Thanks for your commects.
> 
> > Thanks,
> > Andi