linux-kernel - RE: [External] Re: [PATCH] i2c: aspeed: Fix i2c bus hang in slave read

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Date:   Wed, 27 Sep 2023 03:24:53 +0000
From:   Tommy Huang <tommy_huang@...eedtech.com>
To:     Joel Stanley <joel@....id.au>,
        Jian Zhang <zhangjian.3032@...edance.com>
CC:     "brendan.higgins@...ux.dev" <brendan.higgins@...ux.dev>,
        "benh@...nel.crashing.org" <benh@...nel.crashing.org>,
        "andrew@...id.au" <andrew@...id.au>,
        "zhangjian3032@...il.com" <zhangjian3032@...il.com>,
        "yulei.sh@...edance.com" <yulei.sh@...edance.com>,
        "xiexinnan@...edance.com" <xiexinnan@...edance.com>,
        "open list:ARM/ASPEED I2C DRIVER" <linux-i2c@...r.kernel.org>,
        "moderated list:ARM/ASPEED I2C DRIVER" <openbmc@...ts.ozlabs.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-arm-kernel@...ts.infradead.org>,
        "moderated list:ARM/ASPEED MACHINE SUPPORT" 
        <linux-aspeed@...ts.ozlabs.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: RE: [External] Re: [PATCH] i2c: aspeed: Fix i2c bus hang in slave
 read

Hi Joel / Jian,

	Sorry ~ I didn't observe the last mail from Jian.
	
	My last patch was used to avoid the situation like below link.
	https://lists.ozlabs.org/pipermail/openbmc/2023-August/033756.html

	Because I have applied controller reset in my patch.
	Therefore, I think you just need to reset the slave state by "bus->slave_state = ASPEED_I2C_SLAVE_INACTIVE" in your case.

	BR,

	by Tommy

> -----Original Message-----
> From: Joel Stanley <joel@....id.au>
> Sent: Wednesday, September 27, 2023 10:43 AM
> To: Jian Zhang <zhangjian.3032@...edance.com>
> Cc: Tommy Huang <tommy_huang@...eedtech.com>;
> brendan.higgins@...ux.dev; benh@...nel.crashing.org; andrew@...id.au;
> zhangjian3032@...il.com; yulei.sh@...edance.com;
> xiexinnan@...edance.com; open list:ARM/ASPEED I2C DRIVER
> <linux-i2c@...r.kernel.org>; moderated list:ARM/ASPEED I2C DRIVER
> <openbmc@...ts.ozlabs.org>; moderated list:ARM/ASPEED MACHINE SUPPORT
> <linux-arm-kernel@...ts.infradead.org>; moderated list:ARM/ASPEED
> MACHINE SUPPORT <linux-aspeed@...ts.ozlabs.org>; open list
> <linux-kernel@...r.kernel.org>
> Subject: Re: [External] Re: [PATCH] i2c: aspeed: Fix i2c bus hang in slave read
> 
> On Fri, 22 Sept 2023 at 14:39, Jian Zhang <zhangjian.3032@...edance.com>
> wrote:
> > >
> > > Tommy has submitted a similar fix:
> > >
> > >
> > > https://lore.kernel.org/linux-i2c/20230906004910.4157305-1-tommy_hua
> > > ng@...eedtech.com/
> > >
> > > His change is very heavy handed; it reinitialises the bus including
> > > re-parsing the device tree (!).
> > >
> > > Should we have merged this fix instead? If not, are you able to
> > > confirm that his change fixes your issue?
> >
> > I feel it's for solving the same issue, but I think this patch is
> > missing the action `bus->slave_state = ASPEED_I2C_SLAVE_INACTIVE;`,
> > which means it can't resolve my problem. @Tommy, can you help confirm
> this?
> 
> You're right, it doesn't change the slave_state at all.
> 
> Unfortunately, despite no acks from the maintainers, this patch has now been
> merged and backported to stable. We should complete the fix, or revert it
> asap.