linux-kernel - Re: [PATCH 4.19 055/247] soc: aspeed: snoop: Add clock control logic

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Message-ID: <YECWglSMg0EKAhgd@kroah.com>
Date:   Thu, 4 Mar 2021 09:12:50 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     "Yoo, Jae Hyun" <jae.hyun.yoo@...el.com>
Cc:     Joel Stanley <joel@....id.au>,
        John Wang <wangzhiqiang.bj@...edance.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        Vernon Mauery <vernon.mauery@...ux.intel.com>,
        Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 4.19 055/247] soc: aspeed: snoop: Add clock control logic

On Tue, Mar 02, 2021 at 12:09:21AM +0000, Yoo, Jae Hyun wrote:
> > -----Original Message-----
> > From: Joel Stanley <joel@....id.au>
> > Sent: Monday, March 1, 2021 2:44 PM
> > To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>; John Wang
> > <wangzhiqiang.bj@...edance.com>; Yoo, Jae Hyun
> > <jae.hyun.yoo@...el.com>
> > Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>;
> > stable@...r.kernel.org; Vernon Mauery <vernon.mauery@...ux.intel.com>;
> > Sasha Levin <sashal@...nel.org>
> > Subject: Re: [PATCH 4.19 055/247] soc: aspeed: snoop: Add clock control logic
> > 
> > On Mon, 1 Mar 2021 at 16:37, Greg Kroah-Hartman
> > <gregkh@...uxfoundation.org> wrote:
> > >
> > > From: Jae Hyun Yoo <jae.hyun.yoo@...el.com>
> > >
> > > [ Upstream commit 3f94cf15583be554df7aaa651b8ff8e1b68fbe51 ]
> > >
> > > If LPC SNOOP driver is registered ahead of lpc-ctrl module, LPC SNOOP
> > > block will be enabled without heart beating of LCLK until lpc-ctrl
> > > enables the LCLK. This issue causes improper handling on host
> > > interrupts when the host sends interrupt in that time frame.
> > > Then kernel eventually forcibly disables the interrupt with dumping
> > > stack and printing a 'nobody cared this irq' message out.
> > >
> > > To prevent this issue, all LPC sub-nodes should enable LCLK
> > > individually so this patch adds clock control logic into the LPC SNOOP
> > > driver.
> > 
> > Jae, John; with this backported do we need to also provide a corresponding
> > device tree change for the stable tree, otherwise this driver will no longer
> > probe?
> 
> Right. The second patch
> https://lore.kernel.org/linux-arm-kernel/20201208091748.1920-2-wangzhiqiang.bj@bytedance.com/
> John submitted should be applied to stable tree too to make this module be probed
> correctly.

Now queued up, thanks.

greg k-h