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From: Maxime Ripard <maxime.ripard@bootlin.com>
To: Sam Bobrowicz <sam@elite-embedded.com>
Cc: Loic Poulain <loic.poulain@linaro.org>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	linux-media@vger.kernel.org,
	Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
	Mylene Josserand <mylene.josserand@bootlin.com>,
	Hans Verkuil <hans.verkuil@cisco.com>,
	Sakari Ailus <sakari.ailus@linux.intel.com>,
	Hugues Fruchet <hugues.fruchet@st.com>
Subject: Re: [PATCH v2 00/12] media: ov5640: Misc cleanup and improvements
Date: Mon, 7 May 2018 10:10:11 +0200	[thread overview]
Message-ID: <20180507081011.kvo2vbtzhaxqcf4v@flea> (raw)
In-Reply-To: <CAFwsNOEYmcCGnBE1pLV53JxSNEzCOk0oCMw=dowaeD1ckuDuoA@mail.gmail.com>

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On Fri, May 04, 2018 at 02:13:16PM -0700, Sam Bobrowicz wrote:
> > FYI, I've found the following document:
> > https://community.nxp.com/servlet/JiveServlet/downloadImage/105-32914-99951/ov5640_diagram.jpg
> >
> > So it seems that clock tree is a bit different.
> 
> So that is where the Digilent RnD team got their information. I was
> working with an ASCII representation of the same diagram, thanks for
> providing that.
> 
> >
> > So, from my understanding we need to calculate dividers so that:
> > sclk = vtot * htot * fps
> > pclk = sclk  * byte-per-pixel
> > mipisclk = 8 * pclk / num-lanes
> 
> Unfortunately there are more factors at play depending on what
> features you are using in the ISP. Easiest way for me to describe them
> is to just complete my patches, then we can discuss further.

Do we support any of those features at the moment? If not, then we
shouldn't worry about it too much for now.

Maxime

-- 
Maxime Ripard, Bootlin (formerly Free Electrons)
Embedded Linux and Kernel engineering
https://bootlin.com

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  reply	other threads:[~2018-05-07  8:10 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-16 12:36 [PATCH v2 00/12] media: ov5640: Misc cleanup and improvements Maxime Ripard
2018-04-16 12:36 ` [PATCH v2 01/12] media: ov5640: Add auto-focus feature Maxime Ripard
2018-04-19 10:36   ` Laurent Pinchart
2018-04-20 19:10     ` Maxime Ripard
2018-04-16 12:36 ` [PATCH v2 02/12] media: ov5640: Add light frequency control Maxime Ripard
2018-04-19  9:44   ` Laurent Pinchart
2018-04-20 19:04     ` Maxime Ripard
2018-04-24 11:55       ` Sakari Ailus
2018-04-16 12:36 ` [PATCH v2 03/12] media: ov5640: Don't force the auto exposure state at start time Maxime Ripard
2018-04-16 12:36 ` [PATCH v2 04/12] media: ov5640: Init properly the SCLK dividers Maxime Ripard
2018-04-16 12:36 ` [PATCH v2 05/12] media: ov5640: Change horizontal and vertical resolutions name Maxime Ripard
2018-04-16 12:36 ` [PATCH v2 06/12] media: ov5640: Add horizontal and vertical totals Maxime Ripard
2018-04-16 12:36 ` [PATCH v2 07/12] media: ov5640: Program the visible resolution Maxime Ripard
2018-04-16 12:36 ` [PATCH v2 08/12] media: ov5640: Adjust the clock based on the expected rate Maxime Ripard
2018-04-24  7:21   ` Sakari Ailus
2018-04-24 19:36     ` Maxime Ripard
2018-05-02 21:44       ` Sakari Ailus
2018-04-16 12:36 ` [PATCH v2 09/12] media: ov5640: Compute the clock rate at runtime Maxime Ripard
2018-04-16 12:36 ` [PATCH v2 10/12] media: ov5640: Enhance FPS handling Maxime Ripard
2018-04-16 12:37 ` [PATCH v2 11/12] media: ov5640: Add 60 fps support Maxime Ripard
2018-05-15 13:33   ` Hugues FRUCHET
2018-05-17  8:52     ` Maxime Ripard
2018-05-17 13:29       ` Hugues FRUCHET
2018-05-18  9:05         ` Maxime Ripard
2018-04-16 12:37 ` [PATCH v2 12/12] media: ov5640: Remove duplicate auto-exposure setup Maxime Ripard
2018-04-16 23:22 ` [PATCH v2 00/12] media: ov5640: Misc cleanup and improvements Samuel Bobrowicz
2018-04-17 16:01   ` Maxime Ripard
2018-04-18 23:39     ` Samuel Bobrowicz
2018-04-19 12:32       ` Maxime Ripard
2018-04-24 22:11         ` Sam Bobrowicz
2018-04-25 19:53           ` Maxime Ripard
2018-04-27  9:27           ` Laurent Pinchart
2018-05-02 18:11             ` Sam Bobrowicz
2018-05-03 15:16               ` Maxime Ripard
2018-05-04 10:01                 ` Loic Poulain
2018-05-04 21:13                   ` Sam Bobrowicz
2018-05-07  8:10                     ` Maxime Ripard [this message]
2018-05-04  7:26               ` Loic Poulain
2018-05-04 21:26                 ` Sam Bobrowicz
2018-05-08  1:00 ` Sam Bobrowicz
2018-05-17  8:50   ` Maxime Ripard

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