linux-kernel - Re: [PATCH v2 1/2] i3c: master: fixes i3c bus driver probe failure if no i3c device attached

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Message-ID: <ZO9vHAZT7M8hNueW@lizhi-Precision-Tower-5810>
Date:   Wed, 30 Aug 2023 12:32:28 -0400
From:   Frank Li <Frank.li@....com>
To:     Miquel Raynal <miquel.raynal@...tlin.com>
Cc:     alexandre.belloni@...tlin.com, conor.culhane@...vaco.com,
        imx@...ts.linux.dev, linux-i3c@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/2] i3c: master: fixes i3c bus driver probe failure
 if no i3c device attached

On Wed, Aug 30, 2023 at 05:53:55PM +0200, Miquel Raynal wrote:
> Hi Frank,
> 
> Frank.Li@....com wrote on Wed, 30 Aug 2023 10:17:26 -0400:
> 
> > In i3c_master_bus_init()
> > {	...
> > 	ret = i3c_master_rstdaa_locked(master, I3C_BROADCAST_ADDR);
> > 	if (ret && ret != I3C_ERROR_M2)
> > 			  ^^^ // it is enum i3c_error_code
> > 	...
> > }
> > 
> > In dw-i3c-master.c implementation:
> > dw_i3c_ccc_set()
> > {	...
> > 	ret = xfer->ret;
> > 	if (xfer->cmds[0].error == RESPONSE_ERROR_IBA_NACK)
> > 		ccc->err = I3C_ERROR_M2;
> > 
> > 	dw_i3c_master_free_xfer(xfer);
> > 
> > 	return ret;
> > }
> > 
> > Return enum i3c_error_code when error happen in i3c_master_rstdaa_locked().
> 
> I am sorry but the commit log needs to be worked on.
> 
> > 
> > Cc: stable@...r.kernel.org
> > Fixes: 3a379bbcea0a ("i3c: Add core I3C infrastructure")
> > Signed-off-by: Frank Li <Frank.Li@....com>
> > ---
> > 
> > Notes:
> >     Change from v1 to v2:
> >     - cc stable
> > 
> >  drivers/i3c/master.c | 3 +++
> >  1 file changed, 3 insertions(+)
> > 
> > diff --git a/drivers/i3c/master.c b/drivers/i3c/master.c
> > index 08aeb69a78003..00a82f3ab9ac0 100644
> > --- a/drivers/i3c/master.c
> > +++ b/drivers/i3c/master.c
> > @@ -783,6 +783,9 @@ static int i3c_master_rstdaa_locked(struct i3c_master_controller *master,
> >  	ret = i3c_master_send_ccc_cmd_locked(master, &cmd);
> >  	i3c_ccc_cmd_dest_cleanup(&dest);
> >  
> > +	if (ret)
> > +		ret = cmd.err;
> 
> Shouldn't this happen in i3c_master_send_ccc_cmd_locked()?

Sorry, This patch is not necesary at all.
i3c_master_send_ccc_cmd_locked() already handled it.
Only need second patch. You can discard this patch.

Do you need me send 2nd patch only? Or you can just pick 2nd one?

> 
> > +
> >  	return ret;
> >  }
> >  
> 
> 
> Thanks,
> Miquèl