From: Steve Longerbeam <slongerbeam@gmail.com>
To: Lars-Peter Clausen <lars@metafoo.de>, linux-media@vger.kernel.org
Cc: Steve Longerbeam <steve_longerbeam@mentor.com>,
Hans Verkuil <hverkuil@xs4all.nl>
Subject: Re: [PATCH 02/11] Revert "[media] adv7180: fix broken standards handling"
Date: Sat, 9 Jul 2016 11:56:19 -0700 [thread overview]
Message-ID: <578148D3.3080504@gmail.com> (raw)
In-Reply-To: <577E7924.9070301@metafoo.de>
On 07/07/2016 08:45 AM, Lars-Peter Clausen wrote:
> On 07/07/2016 12:59 AM, Steve Longerbeam wrote:
>> Autodetect was likely broken only because access to the
>> interrupt registers were broken, so there were no standard
>> change interrupts. After fixing that, and reverting this,
>> autodetect seems to work just fine on an i.mx6q SabreAuto.
>>
>> This reverts commit 937feeed3f0ae8a0389d5732f6db63dd912acd99.
> The brokenness the commit refers to is conceptual not functional. The driver
> simply implemented the API incorrect. A subdev driver is not allowed to
> automatically switch the output format/resolution randomly. In the best case
> this will confuse the receiver which is not prepared to receive the changed
> resolution, in the worst case it will cause buffer overruns with hardware
> that has no boundary checks. This is why this was removed from the driver.
>
> The correct sequence is for the driver to generate a change notification and
> then have userspace react to that notification by stopping the current
> stream, query the new format/resolution, reconfigure the video pipeline for
> the new format/resolution and re-start the stream.
Hi Lars, ok thanks for the clarification. Yes I agree that makes sense.
I will undo the revert in the next version and retest.
Steve
next prev parent reply other threads:[~2016-07-09 18:56 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-06 22:59 [PATCH 00/11] adv7180 subdev fixes Steve Longerbeam
2016-07-06 22:59 ` [PATCH 01/11] media: adv7180: Fix broken interrupt register access Steve Longerbeam
2016-07-07 14:44 ` Tim Harvey
2016-07-07 15:37 ` Lars-Peter Clausen
2016-07-06 22:59 ` [PATCH 02/11] Revert "[media] adv7180: fix broken standards handling" Steve Longerbeam
2016-07-07 14:48 ` Tim Harvey
2016-07-07 15:45 ` Lars-Peter Clausen
2016-07-09 18:56 ` Steve Longerbeam [this message]
2016-07-06 22:59 ` [PATCH 03/11] media: adv7180: add power pin control Steve Longerbeam
2016-07-07 15:04 ` Tim Harvey
2016-07-07 15:35 ` Lars-Peter Clausen
2016-07-06 22:59 ` [PATCH 04/11] media: adv7180: implement g_parm Steve Longerbeam
2016-07-07 15:04 ` Tim Harvey
2016-07-06 22:59 ` [PATCH 05/11] media: adv7180: init chip with AD recommended register settings Steve Longerbeam
2016-07-07 15:23 ` Tim Harvey
2016-07-07 15:29 ` Lars-Peter Clausen
2016-07-06 22:59 ` [PATCH 06/11] media: adv7180: add bt.656-4 OF property Steve Longerbeam
2016-07-07 14:52 ` Lars-Peter Clausen
2016-07-09 18:59 ` Steve Longerbeam
2016-07-09 21:10 ` Steve Longerbeam
2016-07-09 21:36 ` Steve Longerbeam
2016-07-10 12:10 ` Lars-Peter Clausen
2016-07-10 12:55 ` Hans Verkuil
2016-07-10 14:17 ` Ian Arkver
2016-07-10 14:30 ` Hans Verkuil
2016-07-10 22:34 ` Steve Longerbeam
2016-07-11 7:06 ` Ian Arkver
2016-07-11 22:03 ` Steve Longerbeam
2016-07-12 10:25 ` Ian Arkver
2016-07-12 17:26 ` Steve Longerbeam
2016-07-06 23:00 ` [PATCH 07/11] media: adv7180: change mbus format to UYVY Steve Longerbeam
2016-07-07 15:18 ` Lars-Peter Clausen
2016-07-08 10:52 ` Niklas Söderlund
2016-07-07 15:25 ` Tim Harvey
2016-07-06 23:00 ` [PATCH 08/11] adv7180: send V4L2_EVENT_SOURCE_CHANGE on std change Steve Longerbeam
2016-07-07 15:27 ` Tim Harvey
2016-07-06 23:00 ` [PATCH 09/11] v4l: Add signal lock status to source change events Steve Longerbeam
2016-07-06 23:00 ` [PATCH 10/11] media: adv7180: enable lock/unlock interrupts Steve Longerbeam
2016-07-06 23:00 ` [PATCH 11/11] media: adv7180: fix field type Steve Longerbeam
2016-07-07 14:37 ` [PATCH 00/11] adv7180 subdev fixes Tim Harvey
2016-07-20 0:03 ` [PATCH v2 00/10] adv7180 subdev fixes, v2 Steve Longerbeam
2016-07-20 0:03 ` [PATCH v2 01/10] v4l: of: add "newavmode" property for Analog Devices codecs Steve Longerbeam
2016-07-20 7:37 ` Hans Verkuil
2016-07-20 17:14 ` Steve Longerbeam
2016-07-20 0:03 ` [PATCH v2 02/10] media: adv7180: Fix broken interrupt register access Steve Longerbeam
2016-07-20 0:03 ` [PATCH v2 03/10] media: adv7180: define more registers Steve Longerbeam
2016-07-20 8:54 ` Lars-Peter Clausen
2016-07-20 0:03 ` [PATCH v2 04/10] media: adv7180: add support for NEWAVMODE Steve Longerbeam
2016-07-20 0:03 ` [PATCH v2 05/10] media: adv7180: add power pin control Steve Longerbeam
2016-07-20 8:53 ` Lars-Peter Clausen
2016-07-20 0:03 ` [PATCH v2 06/10] media: adv7180: implement g_parm Steve Longerbeam
2016-07-20 0:03 ` [PATCH v2 07/10] media: adv7180: change mbus format to UYVY Steve Longerbeam
2016-07-20 0:03 ` [PATCH v2 08/10] v4l: Add signal lock status to source change events Steve Longerbeam
2016-07-20 0:03 ` [PATCH v2 09/10] media: adv7180: enable lock/unlock interrupts Steve Longerbeam
2016-07-20 0:03 ` [PATCH v2 10/10] media: adv7180: fix field type Steve Longerbeam
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