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From:   Clark Wang <xiaoning.wang@nxp.com>
To:     Miquel Raynal <miquel.raynal@bootlin.com>
CC:     "conor.culhane@silvaco.com" <conor.culhane@silvaco.com>,
        "alexandre.belloni@bootlin.com" <alexandre.belloni@bootlin.com>,
        "vitor.soares@synopsys.com" <vitor.soares@synopsys.com>,
        "boris.brezillon@bootlin.com" <boris.brezillon@bootlin.com>,
        "linux-i3c@lists.infradead.org" <linux-i3c@lists.infradead.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: RE: [PATCH 2/4] i3c: master: svc: fix atomic issue
Thread-Topic: [PATCH 2/4] i3c: master: svc: fix atomic issue
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Date:   Fri, 16 Jul 2021 01:58:42 +0000
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> -----Original Message-----
> From: Miquel Raynal <miquel.raynal@bootlin.com>
> Sent: Friday, July 16, 2021 6:52
> To: Clark Wang <xiaoning.wang@nxp.com>
> Cc: conor.culhane@silvaco.com; alexandre.belloni@bootlin.com;
> vitor.soares@synopsys.com; boris.brezillon@bootlin.com; linux-
> i3c@lists.infradead.org; linux-kernel@vger.kernel.org
> Subject: Re: [PATCH 2/4] i3c: master: svc: fix atomic issue
>=20
> Hi Clark,
>=20
> Clark Wang <xiaoning.wang@nxp.com> wrote on Thu, 15 Jul 2021 16:24:11
> +0800:
>=20
> > do_daa_locked() function is in a spin lock environment, use
> > readl_poll_timeout_atomic() to replace the origin
> > readl_poll_timeout().
> >
> > Signed-off-by: Clark Wang <xiaoning.wang@nxp.com>
> > ---
> >  drivers/i3c/master/svc-i3c-master.c | 6 +++---
> >  1 file changed, 3 insertions(+), 3 deletions(-)
> >
> > diff --git a/drivers/i3c/master/svc-i3c-master.c
> > b/drivers/i3c/master/svc-i3c-master.c
> > index c25a372f6820..9d80435638ea 100644
> > --- a/drivers/i3c/master/svc-i3c-master.c
> > +++ b/drivers/i3c/master/svc-i3c-master.c
> > @@ -656,7 +656,7 @@ static int svc_i3c_master_readb(struct
> svc_i3c_master *master, u8 *dst,
> >  	u32 reg;
> >
> >  	for (i =3D 0; i < len; i++) {
> > -		ret =3D readl_poll_timeout(master->regs + SVC_I3C_MSTATUS,
> reg,
> > +		ret =3D readl_poll_timeout_atomic(master->regs +
> SVC_I3C_MSTATUS,
> > +reg,
> >  					 SVC_I3C_MSTATUS_RXPEND(reg), 0,
> 1000);
>=20
> You forgot to align the parameters of the function here and below.

Oh, sorry about this. I will send V2 to correct this.

By the way, can you help to check the question I mentioned in the cover =
letter?

Thank you very much!

Best Regards,
Clark Wang

>=20
> Otherwise,
>=20
> Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
>=20
> >  		if (ret)
> >  			return ret;
> > @@ -687,7 +687,7 @@ static int svc_i3c_master_do_daa_locked(struct
> svc_i3c_master *master,
> >  		 * Either one slave will send its ID, or the assignment process
> >  		 * is done.
> >  		 */
> > -		ret =3D readl_poll_timeout(master->regs + SVC_I3C_MSTATUS,
> reg,
> > +		ret =3D readl_poll_timeout_atomic(master->regs +
> SVC_I3C_MSTATUS,
> > +reg,
> >  					 SVC_I3C_MSTATUS_RXPEND(reg) |
> >
> SVC_I3C_MSTATUS_MCTRLDONE(reg),
> >  					 1, 1000);
> > @@ -744,7 +744,7 @@ static int svc_i3c_master_do_daa_locked(struct
> svc_i3c_master *master,
> >  		}
> >
> >  		/* Wait for the slave to be ready to receive its address */
> > -		ret =3D readl_poll_timeout(master->regs + SVC_I3C_MSTATUS,
> reg,
> > +		ret =3D readl_poll_timeout_atomic(master->regs +
> SVC_I3C_MSTATUS,
> > +reg,
> >
> SVC_I3C_MSTATUS_MCTRLDONE(reg) &&
> >  					 SVC_I3C_MSTATUS_STATE_DAA(reg)
> &&
> >  					 SVC_I3C_MSTATUS_BETWEEN(reg),
>=20
>=20
>=20
>=20
> Thanks,
> Miqu=C3=A8l

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