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From: Kars de Jong <jongk@linux-m68k.org>
To: Finn Thain <fthain@telegraphics.com.au>
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 v3 2/2] esp_scsi: Add support for FSC chip
Date: Mon, 18 Nov 2019 14:27:40 +0100
Message-ID: <CACz-3rgx4ftrm0JaBq=X13x_3YdcT5zfjcAq0KZtR+hT6CHmow@mail.gmail.com> (raw)
In-Reply-To: <alpine.LNX.2.21.1.1911151212001.9@nippy.intranet>

Hi Finn,

Thanks again for the review!

Op vr 15 nov. 2019 om 03:09 schreef Finn Thain <fthain@telegraphics.com.au>:
> On Thu, 14 Nov 2019, Kars de Jong wrote:
>
> > The FSC (NCR53CF9x-2 / SYM53CF9x-2) has a different family code than QLogic
> > or Emulex parts. This caused it to be detected as a FAS100A.
> >
> > Unforunately, this meant the configuration of the CONFIG3 register was
> > incorrect. This causes data transfer issues with FAST-SCSI targets.
> >
> > The FSC also has the CONFIG4 register. It can be used to enable a feature
> > called Active Negation which should always be enabled according to the data
> > manual.
> >
> > Signed-off-by: Kars de Jong <jongk@linux-m68k.org>
>
> Reviewed-by: Finn Thain <fthain@telegraphics.com.au>
>
> This is not the best scope for this variable. You have to touch both lines
> (declaration and initialization) anyway, so you can easily improve this.

Good point, I will move it to inside the  "if (esp->rev) == FAST) {" block.

> > -             /* Fast 236, AM53c974 or HME */
> > +     case FSC:
> > +             /* Fast 236, AM53c974, FSC or HME */
>
> This comment merely re-states the logic in the case labels. If you don't
> delete the comment, it has to be maintained along with the case labels.
> Consequently this patch is longer than it needs to be.

Yes, I agree. I'll remove the comment.

>
> You've added "(FSC)" and "(am53c974)" here, which is fine but you've
> repeated yourself in the comment, "found on am53c974 and FSC chips". The
> DRY principle applies here too (Don't Repeat Yourself).

I'll also remove that comment.

> > @@ -264,6 +271,7 @@ enum esp_rev {
> >       ESP236,
> >       FAS236,
> >       PCSCSI,  /* AM53c974 */
> > +     FSC,     /* NCR/Symbios Logic FSC */
>
> Is there a difference between "FSC" and "NCR/Symbios Logic FSC"?

No, the respective data manuals all name these variants as "FSC".

> The reader has to infer that not all "FSC" chips are equivalent and that the
> brand name is significant. Whereas, there is real value in putting a part
> code here (as in the line above).

Agreed, I'll add the part code instead.

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
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 [this message]
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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