linux-kernel - Re: [PATCH v4 19/23] ata: ahci: Add DWC AHCI SATA controller support

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Message-ID: <20220617203649.wa2b3etx6gpm3s5g@mobilestation>
Date:   Fri, 17 Jun 2022 23:36:49 +0300
From:   Serge Semin <fancer.lancer@...il.com>
To:     Damien Le Moal <damien.lemoal@...nsource.wdc.com>
Cc:     Randy Dunlap <rdunlap@...radead.org>,
        Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Hans de Goede <hdegoede@...hat.com>,
        Jens Axboe <axboe@...nel.dk>, Hannes Reinecke <hare@...e.de>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Rob Herring <robh+dt@...nel.org>, linux-ide@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org
Subject: Re: [PATCH v4 19/23] ata: ahci: Add DWC AHCI SATA controller support

On Thu, Jun 16, 2022 at 09:31:30AM +0900, Damien Le Moal wrote:
> On 2022/06/16 6:30, Serge Semin wrote:
> > On Fri, Jun 10, 2022 at 04:34:13PM -0700, Randy Dunlap wrote:
> >> Hi Serge,
> >>
> >> On 6/10/22 14:58, Serge Semin wrote:
> >>> On Fri, Jun 10, 2022 at 09:34:46AM -0700, Randy Dunlap wrote:
> >>>> Hi--
> >>>
> >>> Hi Randy
> >>>
> >>>>
> >>>> On 6/10/22 01:17, Serge Semin wrote:
> >>>>> diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
> >>>>> index bb45a9c00514..95e0e022b5bb 100644
> >>>>> --- a/drivers/ata/Kconfig
> >>>>> +++ b/drivers/ata/Kconfig
> >>>>> @@ -176,6 +176,16 @@ config AHCI_DM816
> >>>>>  
> >>>>>  	  If unsure, say N.
> >>>>>  
> >>>>> +config AHCI_DWC
> >>>>> +	tristate "Synopsys DWC AHCI SATA support"
> >>>>> +	select SATA_HOST
> >>>>> +	default SATA_AHCI_PLATFORM
> >>>>
> >>>
> >>>> I don't think this needs to default to SATA_AHCI_PLATFORM.
> >>>> It might build a driver that isn't needed.
> >>>> And it's incompatible with "If unsure, say N."
> >>>
> >>> Basically you are right, but this particular setting is connected with
> >>> the modification I've done in the drivers/ata/ahci_platform.c driver
> >>> in the framework of this commit. I've moved the "snps,spear-ahci" and
> >>> "snps,dwc-ahci" compatible devices support to the new driver. Thus
> >>> should I omit the SATA_AHCI_PLATFORM dependency their default kernel
> >>> configs will lack the corresponding controllers support. If it's not a
> >>> problem and we can rely on the kernel build system ability to ask
> >>> whether the new config needs to be set/cleared, then I would be very
> >>> happy to drop the default setting. What do you think?
> >>
> > 
> >> I'd prefer to try it like that.
> >> If it becomes a problem, we can go back to this v4 patch.
> > 
> > Agreed then (seeing Damien is silent about your comment).
> 

> I have not thought about it :)
> I do not use SATA PLATFORM at all, so I am not familiar with its dependencies.
> Will have a look and do my usual build tests anyway.

Ok. I'll be waiting for you reply in this regard the before
re-submitting the next series version.

-Sergey

> 
> > 
> > -Sergey
> > 
> >>
> >>>>> +	help
> >>>>> +	  This option enables support for the Synopsys DWC AHCI SATA
> >>>>> +	  controller implementation.
> >>>>> +
> >>>>> +	  If unsure, say N.
> >>>>
> >>>> -- 
> >>>> ~Randy
> >>
> >> Thanks.
> >> -- 
> >> ~Randy
> 
> 
> -- 
> Damien Le Moal
> Western Digital Research