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From: Finn Thain <fthain@telegraphics.com.au>
To: Kars de Jong <jongk@linux-m68k.org>
Cc: "James E.J. Bottomley" <jejb@linux.ibm.com>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	Hannes Reinecke <hare@suse.com>,
	linux-scsi@vger.kernel.org, linux-m68k@vger.kernel.org,
	schmitzmic@gmail.com
Subject: Re: [PATCH 2/2] esp_scsi: Add support for FSC chip
Date: Thu, 14 Nov 2019 09:24:37 +1100 (AEDT)
Message-ID: <alpine.LNX.2.21.1.1911140903490.21@nippy.intranet> (raw)
In-Reply-To: <CACz-3rhP9pfg4tVe5GikX-7MWC2sGtE0AsoPeuUBR-a07YxQFA@mail.gmail.com>

On Wed, 13 Nov 2019, Kars de Jong wrote:

> Op wo 13 nov. 2019 om 00:18 schreef Finn Thain <fthain@telegraphics.com.au>:
> >
> > On Tue, 12 Nov 2019, Kars de Jong wrote:
> > > +#define ESP_UID_REV           0x07     /* ESP revision bitmask */
> >
> > This is unused.
> 
> Yes, but it was already there, I just moved it.
> 

Sure, but if you move dead code, it creates churn which can lead to merge 
conflicts. And such changes still require code review.

Also, you'd lose an opportunity to delete the dead code, which is a pity, 
since that would then require a separate patch.

> I prefer to leave it in, since it describes the register layout.
> 

Well, the driver can't be understood from the code alone. The datasheet 
will always be required reading.

> > > +#define ESP_UID_FAM           0xf8     /* ESP family bitmask */
> > > +
> > > +#define ESP_FAMILY(uid) (((uid) & ESP_UID_FAM) >> 3)
> > > +
> >
> > The ESP_UID_FAM symbol only appears here. I don't think it adds value.
> 
> OK, I can just change the macro to:
> 
> #define ESP_FAMILY(uid) (((uid) & 0xf8) >> 3)
> 

Now that I understand the relationship between UID and Family, I see why 
you did this.

> > > +/* Values for the ESP family */
> >
> > I would omit that comment.
> 
> I will change it to "Values for the ESP family bits" as you suggested
> in the next mail.
> 

Great.

> > >  #define ESP_UID_F100A         0x00     /* ESP FAS100A  */
> > >  #define ESP_UID_F236          0x02     /* ESP FAS236   */
> > > -#define ESP_UID_REV           0x07     /* ESP revision */
> > > -#define ESP_UID_FAM           0xf8     /* ESP family   */
> > > +#define ESP_UID_HME           0x0a     /* FAS HME      */
> > > +#define ESP_UID_FSC           0x14     /* NCR/Symbios Logic FSC */
> > >
> >
> > Is there a distinction between the chip's uid and the chip's family?
> 
> Yes, the complete UID also includes the revision. The old driver had 
> cases where the family code was the same but the revision was different.
> 

Makes sense. Thanks for the explanation.

-- 

> Kind regards,
> 
> Kars.
> 

  reply index

Thread overview: 74+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-24 20:56 Amiga PCMCIA network card support Andreas 'count' Kotes
2019-10-25  7:25 ` Kars de Jong
2019-10-25 11:49   ` Andreas 'count' Kotes
2019-10-28  9:19     ` Kars de Jong
2019-10-28 11:08       ` John Paul Adrian Glaubitz
2019-10-28 13:00         ` Kars de Jong
2019-10-28 13:20           ` John Paul Adrian Glaubitz
2019-10-28 15:39             ` ESP SCSI driver (was: Amiga PCMCIA network card support) Kars de Jong
2019-10-28 18:32               ` Michael Schmitz
2019-10-29  9:37                 ` Kars de Jong
2019-10-29 20:20                   ` ESP SCSI driver Michael Schmitz
2019-10-29 22:05                   ` [PATCH] esp_scsi: Add support for FSC chip Kars de Jong
2019-10-30  0:23                     ` Michael Schmitz
2019-10-30  7:11                       ` Kars de Jong
2019-10-30 18:42                         ` Michael Schmitz
2019-10-30  0:31                     ` Finn Thain
2019-10-30  1:06                       ` Michael Schmitz
2019-10-30  7:25                         ` Kars de Jong
2019-10-30  8:45                           ` Geert Uytterhoeven
2019-10-30  9:08                             ` Kars de Jong
2019-10-30 18:34                               ` Michael Schmitz
2019-10-30 18:52                             ` Brad Boyer
2019-10-30  7:22                       ` Kars de Jong
2019-10-30 23:15                         ` Finn Thain
2019-11-12 18:57                     ` [PATCH 0/2] Some esp_scsi updates Kars de Jong
2019-11-12 18:57                       ` [PATCH 1/2] esp_scsi: Correct ordering of PCSCSI definition in esp_rev enum Kars de Jong
2019-11-12 23:07                         ` Finn Thain
2019-11-13  8:00                           ` Kars de Jong
2019-11-13 22:25                             ` Finn Thain
2019-11-13 14:22                         ` Christoph Hellwig
2019-11-13 15:03                           ` Kars de Jong
2019-11-12 18:57                       ` [PATCH 2/2] esp_scsi: Add support for FSC chip Kars de Jong
2019-11-12 23:18                         ` Finn Thain
2019-11-12 23:57                           ` Finn Thain
2019-11-13  9:30                           ` Kars de Jong
2019-11-13 22:24                             ` Finn Thain [this message]
2019-11-14 21:59                       ` [PATCH v2 0/2] Some esp_scsi updates Kars de Jong
2019-11-14 21:59                         ` [PATCH 1/2] esp_scsi: Correct ordering of PCSCSI definition in esp_rev enum Kars de Jong
2019-11-14 22:06                           ` Kars de Jong
2019-11-14 21:59                         ` [PATCH 2/2] esp_scsi: Add support for FSC chip Kars de Jong
2019-11-14 22:07                           ` Kars de Jong
2019-11-14 22:25                         ` [PATCH v3 0/2] Some esp_scsi updates Kars de Jong
2019-11-14 22:25                           ` [PATCH v2 1/2] esp_scsi: Correct ordering of PCSCSI definition in esp_rev enum Kars de Jong
2019-11-15  2:13                             ` Finn Thain
2019-11-15  7:04                               ` Kars de Jong
2019-11-14 22:25                           ` [PATCH v3 2/2] esp_scsi: Add support for FSC chip Kars de Jong
2019-11-15  2:09                             ` Finn Thain
2019-11-18 13:27                               ` Kars de Jong
2019-11-09 19:14                   ` [PATCH] zorro_esp: increase maximum dma length to 65536 bytes Kars de Jong
2019-11-09 20:12                     ` James Bottomley
2019-11-10  2:36                       ` Michael Schmitz
2019-11-10  9:01                         ` Kars de Jong
2019-11-10 19:26                           ` Michael Schmitz
2019-11-11  8:47                             ` Kars de Jong
2019-11-10 19:35                         ` James Bottomley
2019-11-12 17:55                           ` [PATCH v2] zorro_esp: Limit DMA transfers to 65536 bytes (except on Fastlane) Kars de Jong
2019-11-12 22:46                             ` Finn Thain
2019-11-13  2:27                             ` Martin K. Petersen
2019-11-12  9:34                         ` [PATCH] zorro_esp: increase maximum dma length to 65536 bytes Kars de Jong
2019-11-09 22:53                     ` Finn Thain
2019-11-10  9:06                       ` Kars de Jong
2019-10-28 23:38               ` ESP SCSI driver (was: Amiga PCMCIA network card support) Finn Thain
2019-10-29 11:52                 ` Kars de Jong
2019-10-29 20:16                   ` ESP SCSI driver Michael Schmitz
2019-10-28 22:31           ` Amiga PCMCIA network card support Finn Thain
2019-10-29  8:56           ` FOSDEM (was: Re: Amiga PCMCIA network card support) Geert Uytterhoeven
2019-10-29  9:13             ` John Paul Adrian Glaubitz
2019-10-28 22:08       ` Amiga PCMCIA network card support Finn Thain
2019-10-29  9:00       ` Geert Uytterhoeven
2019-10-29  9:12         ` John Paul Adrian Glaubitz
2019-10-29  9:14           ` Geert Uytterhoeven
2019-10-29  9:20             ` John Paul Adrian Glaubitz
2019-10-29  9:40         ` Kars de Jong
2019-10-28  6:57   ` Michael Schmitz

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