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From: Pavel Machek <pavel@ucw.cz>
To: Sakari Ailus <sakari.ailus@iki.fi>
Cc: ivo.g.dimitrov.75@gmail.com, sre@kernel.org,
	pali.rohar@gmail.com, linux-media@vger.kernel.org,
	galak@codeaurora.org, mchehab@osg.samsung.com,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4] media: Driver for Toshiba et8ek8 5MP sensor
Date: Sun, 20 Nov 2016 16:31:54 +0100	[thread overview]
Message-ID: <20161120153153.GD5189@amd> (raw)
In-Reply-To: <20161119232943.GF13965@valkosipuli.retiisi.org.uk>

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Hi!

> > +	/* V4L2_CID_EXPOSURE */
> > +	min = et8ek8_exposure_rows_to_us(sensor, 1);
> > +	max = et8ek8_exposure_rows_to_us(sensor,
> > +				sensor->current_reglist->mode.max_exp);
> 
> Haven't I suggested to use lines instead? I vaguely remember doing so...
> this would remove quite some code from the driver.

Lines ... lines ... no, I don't think I understand how to use lines
here. I guess I could switch units from us to rows here...?

Is it good idea? For userspace, microseconds are really a nice
interface, because ... well, that's what photographers are used to
think about (ISO 400, time 1/100). fcam also uses usec internally.

In the current camera code, I do autogain in small resolution, then
use same parameters (gain, time) at higher resolution. I guess I could
do the same with the non-microseconds interface, but then I'd have to
move the microsecond computation into userspace. And userspace is
not really good place to do that, as it does not know (and should not
have to know!) such low level details.

So... can we keep the interface as it is?

Thanks,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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  parent reply	other threads:[~2016-11-20 15:32 UTC|newest]

Thread overview: 97+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-10-23 20:03 [PATCH v4] media: Driver for Toshiba et8ek8 5MP sensor Pavel Machek
2016-10-23 20:19 ` Sakari Ailus
2016-10-23 20:33   ` Pavel Machek
2016-10-31 22:54     ` Sakari Ailus
2016-11-01  6:36       ` Ivaylo Dimitrov
2016-11-01 20:11         ` Sakari Ailus
2016-11-01 22:14           ` Ivaylo Dimitrov
2016-11-02  8:15         ` Pavel Machek
2016-11-02  8:16           ` Ivaylo Dimitrov
2016-11-01 15:39       ` Pavel Machek
2016-11-01 20:08         ` Sakari Ailus
2016-11-03  8:14           ` Pavel Machek
2016-11-03 22:48       ` Sebastian Reichel
2016-11-03 23:05         ` Sakari Ailus
2016-11-03 23:40           ` Ivaylo Dimitrov
2016-11-04  0:05           ` Sebastian Reichel
2016-11-14 21:58             ` Sakari Ailus
2016-11-15  0:53               ` Sebastian Reichel
2016-11-15 10:54         ` Pavel Machek
2016-11-15 22:55           ` Sakari Ailus
2016-10-23 20:40   ` Pavel Machek
2016-10-31 22:58     ` Sakari Ailus
2016-11-02  0:45       ` Laurent Pinchart
2016-10-23 20:47   ` Pavel Machek
2016-12-13 21:05   ` Pavel Machek
2016-12-18 21:56     ` Sakari Ailus
2016-11-19 23:29 ` Sakari Ailus
2016-11-20 10:02   ` Pavel Machek
2016-11-20 15:20   ` Pavel Machek
2016-11-20 15:21   ` Pavel Machek
2016-11-20 15:31   ` Pavel Machek [this message]
2016-12-14 12:24   ` [PATCH v5] " Pavel Machek
2016-12-14 13:03     ` Pali Rohár
2016-12-14 15:52       ` Ivaylo Dimitrov
2016-12-14 20:12       ` Pavel Machek
2016-12-14 22:07         ` Pali Rohár
2016-12-14 22:35           ` Pavel Machek
2016-12-18 22:01         ` Sakari Ailus
2016-12-20 12:37           ` Pavel Machek
2016-12-20 14:01             ` Sakari Ailus
2016-12-20 22:42               ` Pavel Machek
2016-12-21 13:42     ` Sakari Ailus
2016-12-21 22:42       ` Pavel Machek
2016-12-21 23:29         ` Sakari Ailus
2016-12-22  9:34           ` Pavel Machek
2016-12-22 10:01     ` [PATCH v6] " Pavel Machek
2016-12-22 13:39       ` [RFC/PATCH] media: Add video bus switch Pavel Machek
2016-12-22 14:32         ` Sebastian Reichel
2016-12-22 20:53           ` Pavel Machek
2016-12-22 23:11             ` Sebastian Reichel
2016-12-22 22:42           ` Pavel Machek
2016-12-22 23:40             ` Sebastian Reichel
2016-12-23 11:42               ` Pavel Machek
2016-12-23 18:53                 ` Ivaylo Dimitrov
2016-12-23 20:56               ` Pavel Machek
2016-12-24 14:26               ` Pavel Machek
2016-12-24 14:43                 ` Pavel Machek
2016-12-24 15:20         ` [PATCH] " Pavel Machek
2016-12-24 18:35           ` kbuild test robot
2017-01-12 11:17           ` Pavel Machek
2017-02-03 22:25             ` Sakari Ailus
2017-02-05 22:16               ` Pavel Machek
2017-02-05 22:44                 ` Sakari Ailus
2017-02-03 12:35           ` [PATCH] devicetree: " Pavel Machek
2017-02-03 13:07             ` Sakari Ailus
2017-02-03 21:06               ` Pavel Machek
2017-02-03 21:34                 ` Sakari Ailus
2017-02-04 21:56                   ` Pavel Machek
2017-02-04 22:33                     ` Sakari Ailus
2017-02-05 21:12                       ` Pavel Machek
2017-02-05 23:40                         ` Sebastian Reichel
2017-02-06  9:37                           ` [PATCH] media: add operation to get configuration of "the other side" of the link Pavel Machek
2017-12-19 15:43                             ` Sakari Ailus
2017-12-20 17:54                     ` [PATCH] devicetree: Add video bus switch Laurent Pinchart
2017-12-21  9:05                       ` Sakari Ailus
2017-12-21 16:36                       ` Ivaylo Dimitrov
2017-12-22  9:24                       ` Pavel Machek
2017-02-03 13:32             ` Pali Rohár
2017-02-03 21:07               ` Pavel Machek
2017-02-04  1:04                 ` Sebastian Reichel
2017-02-08 21:36             ` Rob Herring
2017-02-08 22:30               ` Pavel Machek
2017-02-09 23:02                 ` Rob Herring
2017-02-09 23:03                   ` Rob Herring
2017-02-10 19:54                     ` Pavel Machek
2017-02-10 22:17                       ` Sakari Ailus
2017-02-13  9:54                         ` Pavel Machek
2017-02-13 10:20                           ` Sakari Ailus
2017-03-02  8:54                             ` Pavel Machek
2017-02-08 22:34               ` Pavel Machek
2017-02-09 22:58                 ` Rob Herring
2017-02-10 21:17                   ` Pavel Machek
2016-12-27  9:26       ` [PATCH v6] media: Driver for Toshiba et8ek8 5MP sensor Sakari Ailus
2016-12-27 20:45         ` Pavel Machek
2016-12-27 20:59           ` [PATCH] mark myself as mainainer for camera on N900 Pavel Machek
2016-12-27 23:57             ` Sebastian Reichel
2017-01-25 13:48               ` Sakari Ailus

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