From: JP <jp@jpvw.nl>
To: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>,
Gonsolo <gonsolo@gmail.com>
Cc: crope@iki.fi, Sean Young <sean@mess.org>,
linux-media@vger.kernel.org,
Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] si2157: Add support for Logilink VG0022A.
Date: Fri, 4 Oct 2019 13:50:43 +0200 [thread overview]
Message-ID: <23d9856c-cc12-7212-9126-90d80f67abfb@jpvw.nl> (raw)
In-Reply-To: <20191003170329.3624f7f2@coco.lan>
On 10/3/19 10:03 PM, Mauro Carvalho Chehab wrote:
> Em Thu, 3 Oct 2019 21:51:35 +0200
> Gonsolo <gonsolo@gmail.com> escreveu:
>
>>> 1) The firmware file is likely at the Windows driver for this device
>>> (probably using a different format). It should be possible to get
>>> it from there.
>> If you tell me how I'm willing to do this. :)
> I don't know. I was not the one that extracted the firmware. I guess
> Antti did it.
>
> I suspect that there are some comments about that in the past at the
> ML. seek at lore.kernel.org.
>
>>> 2) Another possibility would be to add a way to tell the si2168 driver
>>> to not try to load a firmware, using the original one. That would
>>> require adding a field at si2168_config to allow signalizing to it
>>> that it should not try to load a firmware file, and add a quirk at
>>> the af9035 that would set such flag for Logilink VG0022A.
>> I don't get this. Which firmware, si2168 or si2157?
> The one that it is causing the problem. If I understood well, the
> culprit was the si2168 firmware.
>
>> I'm still for option 3: If there is a bogus chip revision number it's
>> likely the VG0022A and we can safely set fw to NULL, in which case
>> everything works.
>> All already working devices will continue to work as before.
>> With a low probability there are other devices that will return 0xffff
>> but a) they didn't work until now and b) they receive a clear message
>> that they return bogus numbers and this works just for the VG0022A, in
>> which case this hardware can be tested.
>> At last, *my* VG0022A will work without a custom kernel which I'm a
>> big fan of. :))
>>
>> Are there any counterarguments except that it is not the cleanest
>> solution in the universe? ;)
> That's a really bad solution. Returning 0xff is what happens when
> things go wrong during I2C transfers. Several problems can cause it,
> including device misfunction. Every time someone comes with a patch
> trying to ignore it, things go sideways for other devices (existing
> or future ones).
>
> Ignoring errors is always a bad idea.
add module param say 'gonso_hack_vg0022a'
if true, act on error by setting a flag
if this flag is set don't load firmware
Jan Pieter.
next prev parent reply other threads:[~2019-10-04 11:50 UTC|newest]
Thread overview: 77+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-30 10:32 DVB-T2 Stick Gonsolo
2019-02-19 21:30 ` Sean Young
2019-10-01 22:19 ` Gonsolo
2019-10-01 23:52 ` Mauro Carvalho Chehab
2019-10-02 14:13 ` [PATCH] si2157: Add support for Logilink VG0022A Gon Solo
2019-10-02 14:13 ` Gon Solo
2019-10-02 14:27 ` Sean Young
2019-10-02 14:44 ` Gonsolo
2019-10-02 15:06 ` Sean Young
2019-10-02 15:21 ` Gonsolo
2019-10-02 17:23 ` JP
2019-10-02 18:49 ` Mauro Carvalho Chehab
2019-10-03 8:06 ` [PATCH 0/1] Testing timing patch " Gon Solo
2019-10-03 8:06 ` [PATCH 1/1] Test Mauros timing patch Gon Solo
2019-10-03 10:13 ` [PATCH] si2157: Add support for Logilink VG0022A Gonsolo
2019-10-03 10:57 ` Gonsolo
2019-10-03 11:17 ` Mauro Carvalho Chehab
2019-10-03 11:41 ` Gonsolo
2019-10-03 12:49 ` Mauro Carvalho Chehab
2019-10-03 12:52 ` Mauro Carvalho Chehab
2019-10-03 13:02 ` Gon Solo
2019-10-03 13:53 ` Gonsolo
2019-10-03 14:05 ` Mauro Carvalho Chehab
2019-10-03 14:29 ` Gonsolo
2019-10-03 12:01 ` Gon Solo
2019-10-03 12:12 ` Mauro Carvalho Chehab
2019-10-03 12:20 ` Gon Solo
2019-10-03 12:45 ` [PATCH 0/3] " Gon Solo
2019-10-03 12:45 ` [PATCH 1/3] [PATCH] af9035: Better explain how i2c bus speed is computed Gon Solo
2019-10-03 12:45 ` [PATCH 2/3] [PATCH] s2157: Handle bogus chip version Gon Solo
2019-10-03 12:45 ` [PATCH 3/3] [PATCH] af9035: Add Logilink VG0022A id Gon Solo
2019-10-03 11:05 ` [PATCH] si2157: Add support for Logilink VG0022A Mauro Carvalho Chehab
2019-10-03 15:00 ` Gonsolo
2019-10-03 15:02 ` Mauro Carvalho Chehab
2019-10-03 15:17 ` Gonsolo
2019-10-03 16:03 ` Gon Solo
2019-10-03 16:09 ` Mauro Carvalho Chehab
2019-10-03 16:23 ` Gon Solo
2019-10-03 17:42 ` Mauro Carvalho Chehab
2019-10-03 17:49 ` Gonsolo
2019-10-03 18:32 ` Gon Solo
2019-10-03 18:42 ` JP
2019-10-03 18:50 ` Gonsolo
2019-10-03 18:53 ` Gonsolo
2019-10-03 19:19 ` Gonsolo
2019-10-03 19:39 ` Mauro Carvalho Chehab
2019-10-03 19:44 ` Mauro Carvalho Chehab
2019-10-03 19:51 ` Gonsolo
2019-10-03 20:03 ` Mauro Carvalho Chehab
2019-10-03 20:32 ` Gonsolo
2019-10-04 11:50 ` JP [this message]
2019-10-04 12:08 ` Mauro Carvalho Chehab
2019-10-04 13:15 ` [PATCH 1/4] media: si2168: use bits instead of bool for flags Mauro Carvalho Chehab
2019-10-04 13:15 ` [PATCH 2/4] media: si2168: add support for not loading a firmware Mauro Carvalho Chehab
2019-10-04 13:15 ` [PATCH 3/4] media: af9035: add support for Logilink VG0022A Mauro Carvalho Chehab
2019-10-09 21:44 ` Gon Solo
2019-10-09 22:04 ` Gon Solo
2019-10-10 8:23 ` Gon Solo
2019-10-10 9:18 ` Gon Solo
2019-10-10 9:50 ` [PATCH 0/4] Add " Gon Solo
2019-10-10 10:10 ` Mauro Carvalho Chehab
2019-10-10 9:51 ` [PATCH 1/4] si2168: Use bits and convert to kernel-doc format Gon Solo
2019-10-10 9:51 ` [PATCH 2/4] si2157: Add option for not downloading firmware Gon Solo
2019-10-10 9:51 ` [PATCH 3/4] af9035: Make speed computation clear Gon Solo
2019-10-10 9:51 ` [PATCH 4/4] Add support for Logilink VG0022A Gon Solo
2019-10-10 11:44 ` Gon Solo
2019-11-15 18:06 ` Gon Solo
2019-10-04 13:15 ` [PATCH 4/4] media: af9035: add the formula used for the I2C speed Mauro Carvalho Chehab
2019-10-10 10:55 ` [PATCH 1/4] media: si2168: use bits instead of bool for flags Gon Solo
2019-10-10 11:34 ` Mauro Carvalho Chehab
2019-10-10 11:42 ` Mauro Carvalho Chehab
2019-10-04 13:50 ` [PATCH] si2157: Add support for Logilink VG0022A JP
2019-10-04 14:16 ` Mauro Carvalho Chehab
2019-10-03 19:40 ` Gonsolo
2019-10-03 19:52 ` Mauro Carvalho Chehab
2019-10-03 19:57 ` Gonsolo
2019-10-02 15:00 ` Mauro Carvalho Chehab
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