linux-kernel - Re: [PATCH v3 13/23] ata: libahci: Extend port-cmd flags set with port capabilities

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Date:   Fri, 13 May 2022 15:13:32 +0300
From:   Serge Semin <fancer.lancer@...il.com>
To:     Sergei Shtylyov <sergei.shtylyov@...il.com>
Cc:     Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Jens Axboe <axboe@...nel.dk>,
        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 v3 13/23] ata: libahci: Extend port-cmd flags set with
 port capabilities

On Fri, May 13, 2022 at 11:22:44AM +0300, Sergei Shtylyov wrote:
> On 5/12/22 2:18 AM, Serge Semin wrote:
> 
> > Currently not all of the Port-specific capabilities listed in the
> > PORT_CMD-enumeration. Let's extend that set with the Cold Presence
> > Detection and Mechanical Presence Switch attached to the Port flags [1] so
> > to closeup the set of the platform-specific port-capabilities flags.  Note
> > these flags are supposed to be set by the platform firmware if there is
> > one. Alternatively as we are about to do they can be set by means of the
> > OF properties.
> > 
> > While at it replace PORT_IRQ_DEV_ILCK with PORT_IRQ_DEV_MPS and fix the
> 

>    Your code has PORT_IRQ_DMPS instead...

Right. The correct macro name is used in the patch body. I'll fix the
log. Thanks.

-Sergey

> 
> > comment there. In accordance with [2] that IRQ flag is supposed to
> > indicate the state of the signal coming from the Mechanical Presence
> > Switch.
> > 
> > [1] Serial ATA AHCI 1.3.1 Specification, p.27
> > [2] Serial ATA AHCI 1.3.1 Specification, p.7
> > 
> > Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>
> > ---
> >  drivers/ata/ahci.h | 7 ++++++-
> >  1 file changed, 6 insertions(+), 1 deletion(-)
> > 
> > diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
> > index 7d834deefeb9..f501531bd1b3 100644
> > --- a/drivers/ata/ahci.h
> > +++ b/drivers/ata/ahci.h
> > @@ -138,7 +138,7 @@ enum {
> >  	PORT_IRQ_BAD_PMP	= (1 << 23), /* incorrect port multiplier */
> >  
> >  	PORT_IRQ_PHYRDY		= (1 << 22), /* PhyRdy changed */
> > -	PORT_IRQ_DEV_ILCK	= (1 << 7), /* device interlock */
> > +	PORT_IRQ_DMPS		= (1 << 7), /* mechanical presence status */
> >  	PORT_IRQ_CONNECT	= (1 << 6), /* port connect change status */
> >  	PORT_IRQ_SG_DONE	= (1 << 5), /* descriptor processed */
> >  	PORT_IRQ_UNK_FIS	= (1 << 4), /* unknown FIS rx'd */
> [...]
> 
> MBR, Sergey