From: Mauro Carvalho Chehab <mchehab@redhat.com>
To: Thierry Reding <thierry.reding@avionic-design.de>
Cc: linux-media@vger.kernel.org
Subject: Re: [PATCH 16/21] [staging] tm6000: Select interface on first open.
Date: Thu, 01 Sep 2011 02:53:14 -0300 [thread overview]
Message-ID: <4E5F1DCA.3000804@redhat.com> (raw)
In-Reply-To: <20110901051945.GD18473@avionic-0098.mockup.avionic-design.de>
Em 01-09-2011 02:19, Thierry Reding escreveu:
> * Mauro Carvalho Chehab wrote:
>> Em 04-08-2011 04:14, Thierry Reding escreveu:
>>> Instead of selecting the default interface setting when preparing
>>> isochronous transfers, select it on the first call to open() to make
>>> sure it is available earlier.
>>
>> Hmm... I fail to see what this is needed earlier. The ISOC endpont is used
>> only when the device is streaming.
>>
>> Did you get any bug related to it? If so, please describe it better.
>
> I'm not sure whether this really fixes a bug, but it seems a little wrong to
> me to selecting the interface so late in the process when in fact the device
> is already being configured before (video standard, audio mode, firmware
> upload, ...).
Some applications may open the device just to change the controls. All other drivers
only set alternates/interfaces when the streaming is requested, as alternates/interfaces
are needed only there.
> Thinking about it, this may actually be part of the fix for the "device hangs
> sometimes for inexplicable reasons" bug that this whole patch series seems to
> fix.
It is unlikely, except if the firmware inside the chip is broken (unfortunately,
we have serious reasons to believe that the internal firmware on this chipset has
serious bugs).
I prefer to not apply this patch, except if we have a good reason for that,
as otherwise this driver will behave different than the others.
Regards,
Mauro.
>
> Thierry
next prev parent reply other threads:[~2011-09-01 5:53 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-04 7:13 [PATCH 00/21] [staging] tm6000: Assorted fixes and improvements Thierry Reding
2011-08-04 7:13 ` [PATCH 01/21] [media] tuner/xc2028: Add I2C flush callback Thierry Reding
2011-08-04 7:14 ` [PATCH 02/21] [media] tuner/xc2028: Fix frequency offset for radio mode Thierry Reding
2011-08-31 18:32 ` Mauro Carvalho Chehab
2011-09-01 5:10 ` Thierry Reding
2011-09-01 12:45 ` Andrew Goff
2011-09-01 14:31 ` Mauro Carvalho Chehab
2011-09-02 8:19 ` Thierry Reding
2011-12-31 0:31 ` Javier S. Pedro
2011-08-04 7:14 ` [PATCH 03/21] [staging] tm6000: Miscellaneous cleanups Thierry Reding
2011-08-04 7:14 ` [PATCH 04/21] [staging] tm6000: Use correct input in radio mode Thierry Reding
2011-08-04 7:14 ` [PATCH 05/21] [staging] tm6000: Implement I2C flush callback Thierry Reding
2011-08-04 7:14 ` [PATCH 06/21] [staging] tm6000: Increase maximum I2C packet size Thierry Reding
2011-08-31 19:45 ` Mauro Carvalho Chehab
2011-09-01 5:08 ` Thierry Reding
2011-08-04 7:14 ` [PATCH 07/21] [staging] tm6000: Remove artificial delay Thierry Reding
2011-08-31 19:50 ` Mauro Carvalho Chehab
2011-09-01 5:13 ` Thierry Reding
2011-09-01 5:47 ` Mauro Carvalho Chehab
2011-09-01 6:27 ` [PATCH 1/2] [media] tm6000: Add fast USB access quirk Thierry Reding
2011-09-01 6:27 ` [PATCH 2/2] [media] tm6000: Enable fast USB quirk on Cinergy Hybrid Thierry Reding
2011-09-01 6:33 ` [PATCH 1/2] [media] tm6000: Add fast USB access quirk Thierry Reding
2011-09-01 6:43 ` [PATCH v2 " Thierry Reding
2011-09-01 6:43 ` [PATCH v2 2/2] [media] tm6000: Enable fast USB quirk on Cinergy Hybrid Thierry Reding
2011-08-04 7:14 ` [PATCH 08/21] [staging] tm6000: Flesh out the IRQ callback Thierry Reding
2011-08-04 7:14 ` [PATCH 09/21] [staging] tm6000: Rename active interface register Thierry Reding
2011-08-04 7:14 ` [PATCH 10/21] [staging] tm6000: Disable video interface in radio mode Thierry Reding
2011-08-04 7:14 ` [PATCH 11/21] [staging] tm6000: Rework standard register tables Thierry Reding
2011-08-04 7:14 ` [PATCH 12/21] [staging] tm6000: Add locking for USB transfers Thierry Reding
2011-08-04 7:14 ` [PATCH 13/21] [staging] tm6000: Properly count device usage Thierry Reding
2011-08-04 7:14 ` [PATCH 14/21] [staging] tm6000: Initialize isochronous transfers only once Thierry Reding
2011-08-04 7:14 ` [PATCH 15/21] [staging] tm6000: Execute lightweight reset on close Thierry Reding
2011-08-31 20:53 ` Mauro Carvalho Chehab
[not found] ` <4E5EAA41.4060502@redhat.com>
2011-09-01 5:24 ` Thierry Reding
2011-09-03 17:17 ` Mauro Carvalho Chehab
2011-09-05 5:38 ` Thierry Reding
2011-08-04 7:14 ` [PATCH 16/21] [staging] tm6000: Select interface on first open Thierry Reding
2011-08-31 20:02 ` Mauro Carvalho Chehab
2011-09-01 5:19 ` Thierry Reding
2011-09-01 5:53 ` Mauro Carvalho Chehab [this message]
2011-09-01 6:10 ` Thierry Reding
2011-08-04 7:14 ` [PATCH 17/21] [staging] tm6000: Do not use video buffers in radio mode Thierry Reding
2011-08-04 7:14 ` [PATCH 18/21] [staging] tm6000: Plug memory leak on PCM free Thierry Reding
2011-08-04 7:14 ` [PATCH 19/21] [staging] tm6000: Enable audio clock in radio mode Thierry Reding
2011-08-04 7:14 ` [PATCH 20/21] [staging] tm6000: Enable radio mode for Cinergy Hybrid XE Thierry Reding
2011-08-04 7:14 ` [PATCH 21/21] [staging] tm6000: Remove unnecessary workaround Thierry Reding
2011-08-31 12:41 ` [PATCH 00/21] [staging] tm6000: Assorted fixes and improvements Mauro Carvalho Chehab
2011-08-31 13:12 ` Thierry Reding
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