linux-kernel - Re: [PATCH v1 5/7] mfd: lpc_ich: Switch to generic pci_p2sb

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Date:   Wed, 10 Mar 2021 12:57:26 +0000
From:   Lee Jones <lee.jones@...aro.org>
To:     Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Cc:     Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Jean Delvare <jdelvare@...e.de>,
        Tan Jui Nee <jui.nee.tan@...el.com>,
        Jim Quinlan <james.quinlan@...adcom.com>,
        Jonathan Yong <jonathan.yong@...el.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        linux-kernel@...r.kernel.org, linux-i2c@...r.kernel.org,
        linux-pci@...r.kernel.org, Jean Delvare <jdelvare@...e.com>,
        Peter Tyser <ptyser@...-inc.com>, hdegoede@...hat.com,
        henning.schild@...mens.com
Subject: Re: [PATCH v1 5/7] mfd: lpc_ich: Switch to generic pci_p2sb_bar()

On Wed, 10 Mar 2021, Andy Shevchenko wrote:

> On Wed, Mar 10, 2021 at 10:35:39AM +0000, Lee Jones wrote:
> > On Mon, 08 Mar 2021, Andy Shevchenko wrote:
> > 
> > > Instead of open coding pci_p2sb_bar() functionality we are going to
> > > use generic library for that. There one more user of it is coming.
> > > 
> > > Besides cleaning up it fixes a potential issue if, by some reason,
> > > SPI bar is 64-bit.
> > 
> > Probably worth cleaning up the English in both these sections.
> > 
> >  Instead of open coding pci_p2sb_bar() functionality we are going to
> >  use generic library. There is one more user en route.
> > 
> >  This is more than just a clean-up.  It also fixes a potential issue
> >  seen when SPI bar is 64-bit.
> 
> Thanks!
> 
> > Also worth briefly describing what that issue is I think.
> 
> Current code works if and only if the PCI BAR of the hidden device is inside 4G
> address space. In case firmware decides to go above 4G, we will get a wrong
> address.
> 
> Does it sound good enough?

Yes, that explains it, thanks.

> > > Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
> > > ---
> > >  drivers/mfd/Kconfig   |  1 +
> > >  drivers/mfd/lpc_ich.c | 20 ++++++--------------
> > >  2 files changed, 7 insertions(+), 14 deletions(-)
> > 
> > Code looks fine:
> > 
> > For my own reference (apply this as-is to your sign-off block):
> > 
> >   Acked-for-MFD-by: Lee Jones <lee.jones@...aro.org>
> 
> Thanks for reviewing this series, can you have a look at the earlier sent [1]
> and [2]? First one has a regression fix.

Yes, thanks for the nudge.  These were not in my TODO list.

> [1]: https://lore.kernel.org/lkml/20210302135620.89958-1-andriy.shevchenko@linux.intel.com/T/#u
> [2]: https://lore.kernel.org/lkml/20210301144222.31290-1-andriy.shevchenko@linux.intel.com/T/#u
> 

-- 
Lee Jones [李琼斯]
Senior Technical Lead - Developer Services
Linaro.org │ Open source software for Arm SoCs
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