From: "Rémi Denis-Courmont" <remi@remlab.net>
To: linux-media@vger.kernel.org
Subject: Re: [RFCv3 API PATCH 15/31] v4l2-core: Add new V4L2_CAP_MONOTONIC_TS capability.
Date: Fri, 14 Sep 2012 23:27:47 +0300 [thread overview]
Message-ID: <201209142327.47675@leon.remlab.net> (raw)
In-Reply-To: <5053929D.4050902@iki.fi>
Le vendredi 14 septembre 2012 23:25:01, Sakari Ailus a écrit :
> I had a quick discussion with Laurent, and what he suggested was to use
> the kernel version to figure out the type of the timestamp. The drivers
> that use the monotonic time right now wouldn't be affected by the new
> flag on older kernels. If we've decided we're going to switch to
> monotonic time anyway, why not just change all the drivers now and
> forget the capability flag.
That does not work In Real Life.
People do port old drivers forward to new kernels.
People do port new drivers back to old kernels
User space needs a flag is needed. Full point.
--
Rémi Denis-Courmont
http://www.remlab.net/
next prev parent reply other threads:[~2012-09-14 20:27 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-14 10:57 [RFCv3 API PATCH 00/31] Full series of API fixes from the 2012 Media Workshop Hans Verkuil
2012-09-14 10:57 ` [RFCv3 API PATCH 01/31] v4l: Remove experimental tag from certain API elements Hans Verkuil
2012-09-14 10:57 ` [RFCv3 API PATCH 02/31] videodev2.h: split off controls into v4l2-controls.h Hans Verkuil
2012-09-14 10:57 ` [RFCv3 API PATCH 03/31] DocBook: improve STREAMON/OFF documentation Hans Verkuil
2012-09-14 10:57 ` [RFCv3 API PATCH 04/31] DocBook: make the G/S/TRY_FMT specification more strict Hans Verkuil
2012-09-14 10:57 ` [RFCv3 API PATCH 05/31] DocBook: bus_info can no longer be empty Hans Verkuil
2012-09-14 10:57 ` [RFCv3 API PATCH 06/31] vivi/mem2mem_testdev: update to latest bus_info specification Hans Verkuil
2012-09-14 17:34 ` Sylwester Nawrocki
2012-09-14 10:57 ` [RFCv3 API PATCH 07/31] v4l2-core: deprecate V4L2_BUF_TYPE_PRIVATE Hans Verkuil
2012-09-14 10:57 ` [RFCv3 API PATCH 08/31] DocBook: " Hans Verkuil
2012-09-14 10:57 ` [RFCv3 API PATCH 09/31] v4l2: remove experimental tag from a number of old drivers Hans Verkuil
2012-09-14 10:57 ` [RFCv3 API PATCH 10/31] DocBook: document when to return ENODATA Hans Verkuil
2012-09-14 10:57 ` [RFCv3 API PATCH 11/31] v4l2-core: tvnorms may be 0 for a given input, handle that case Hans Verkuil
2012-09-14 10:57 ` [RFCv3 API PATCH 12/31] Rename V4L2_(IN|OUT)_CAP_CUSTOM_TIMINGS Hans Verkuil
2012-09-14 10:57 ` [RFCv3 API PATCH 13/31] Feature removal: Remove CUSTOM_TIMINGS defines in 3.9 Hans Verkuil
2012-09-14 10:57 ` [RFCv3 API PATCH 14/31] DocBook: fix awkward language and fix the documented return value Hans Verkuil
2012-09-14 10:57 ` [RFCv3 API PATCH 15/31] v4l2-core: Add new V4L2_CAP_MONOTONIC_TS capability Hans Verkuil
2012-09-14 20:25 ` Sakari Ailus
2012-09-14 20:27 ` Rémi Denis-Courmont [this message]
2012-09-14 21:05 ` Sakari Ailus
2012-09-15 7:41 ` Hans Verkuil
2012-09-15 9:31 ` Laurent Pinchart
2012-09-15 10:05 ` Hans Verkuil
2012-09-15 10:37 ` Sakari Ailus
2012-09-15 12:35 ` Hans Verkuil
2012-09-15 20:16 ` Sylwester Nawrocki
2012-09-16 13:57 ` Hans Verkuil
2012-09-16 15:33 ` Laurent Pinchart
2012-09-16 21:59 ` Sylwester Nawrocki
2012-09-17 7:13 ` Daniel Glöckner
2012-09-17 9:18 ` Laurent Pinchart
2012-09-17 9:28 ` Hans Verkuil
2012-09-17 9:30 ` Daniel Glöckner
2012-09-17 17:19 ` Sakari Ailus
2012-09-17 20:27 ` Sylwester Nawrocki
2012-09-18 7:42 ` Sakari Ailus
2012-09-15 10:26 ` Sylwester Nawrocki
2012-09-14 10:57 ` [RFCv3 API PATCH 16/31] Add V4L2_CAP_MONOTONIC_TS where applicable Hans Verkuil
2012-09-14 10:57 ` [RFCv3 API PATCH 17/31] DocBook: clarify that sequence is also set for output devices Hans Verkuil
2012-09-14 10:57 ` [RFCv3 API PATCH 18/31] DocBook: Mark CROPCAP as optional instead of as compulsory Hans Verkuil
2012-09-14 10:57 ` [RFCv3 API PATCH 19/31] v4l2: make vidioc_s_fbuf const Hans Verkuil
2012-09-14 10:57 ` [RFCv3 API PATCH 20/31] v4l2: make vidioc_s_jpegcomp const Hans Verkuil
2012-09-14 10:57 ` [RFCv3 API PATCH 21/31] v4l2: make vidioc_s_freq_hw_seek const Hans Verkuil
2012-09-14 10:57 ` [RFCv3 API PATCH 22/31] v4l2: make vidioc_(un)subscribe_event const Hans Verkuil
2012-09-14 10:57 ` [RFCv3 API PATCH 23/31] v4l2: make vidioc_s_audio const Hans Verkuil
2012-09-14 10:57 ` [RFCv3 API PATCH 24/31] v4l2: make vidioc_s_audout const Hans Verkuil
2012-09-14 10:57 ` [RFCv3 API PATCH 25/31] v4l2: make vidioc_s_modulator const Hans Verkuil
2012-09-14 10:57 ` [RFCv3 API PATCH 26/31] v4l2: make vidioc_s_crop const Hans Verkuil
2012-09-14 10:57 ` [RFCv3 API PATCH 27/31] v4l2-dev: add new VFL_DIR_ defines Hans Verkuil
2012-09-14 10:57 ` [RFCv3 API PATCH 28/31] Set vfl_dir for all display or m2m drivers Hans Verkuil
2012-09-14 17:34 ` Sylwester Nawrocki
2012-09-14 10:57 ` [RFCv3 API PATCH 29/31] v4l2-dev: improve ioctl validity checks Hans Verkuil
2012-09-14 10:57 ` [RFCv3 API PATCH 30/31] v4l2-dev: reorder checks into blocks of ioctls with similar properties Hans Verkuil
2012-09-14 10:57 ` [RFCv3 API PATCH 31/31] Add vfl_dir field documentation Hans Verkuil
2012-09-14 17:34 ` Sylwester Nawrocki
2012-09-14 17:59 ` Hans Verkuil
2012-09-14 21:26 ` [RFCv3 API PATCH 00/31] Full series of API fixes from the 2012 Media Workshop Sakari Ailus
2012-09-15 7:33 ` Hans Verkuil
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