1.. SPDX-License-Identifier: GPL-2.0 2 3.. include:: <isonum.txt> 4 5OMAP 3 Image Signal Processor (ISP) driver 6========================================== 7 8Copyright |copy| 2010 Nokia Corporation 9 10Copyright |copy| 2009 Texas Instruments, Inc. 11 12Contacts: Laurent Pinchart <laurent.pinchart@ideasonboard.com>, 13Sakari Ailus <sakari.ailus@iki.fi>, David Cohen <dacohen@gmail.com> 14 15 16Introduction 17------------ 18 19This file documents the Texas Instruments OMAP 3 Image Signal Processor (ISP) 20driver located under drivers/media/platform/ti/omap3isp. The original driver was 21written by Texas Instruments but since that it has been rewritten (twice) at 22Nokia. 23 24The driver has been successfully used on the following versions of OMAP 3: 25 26- 3430 27- 3530 28- 3630 29 30The driver implements V4L2, Media controller and v4l2_subdev interfaces. 31Sensor, lens and flash drivers using the v4l2_subdev interface in the kernel 32are supported. 33 34 35Split to subdevs 36---------------- 37 38The OMAP 3 ISP is split into V4L2 subdevs, each of the blocks inside the ISP 39having one subdev to represent it. Each of the subdevs provide a V4L2 subdev 40interface to userspace. 41 42- OMAP3 ISP CCP2 43- OMAP3 ISP CSI2a 44- OMAP3 ISP CCDC 45- OMAP3 ISP preview 46- OMAP3 ISP resizer 47- OMAP3 ISP AEWB 48- OMAP3 ISP AF 49- OMAP3 ISP histogram 50 51Each possible link in the ISP is modelled by a link in the Media controller 52interface. For an example program see [#]_. 53 54 55Controlling the OMAP 3 ISP 56-------------------------- 57 58In general, the settings given to the OMAP 3 ISP take effect at the beginning 59of the following frame. This is done when the module becomes idle during the 60vertical blanking period on the sensor. In memory-to-memory operation the pipe 61is run one frame at a time. Applying the settings is done between the frames. 62 63All the blocks in the ISP, excluding the CSI-2 and possibly the CCP2 receiver, 64insist on receiving complete frames. Sensors must thus never send the ISP 65partial frames. 66 67Autoidle does have issues with some ISP blocks on the 3430, at least. 68Autoidle is only enabled on 3630 when the omap3isp module parameter autoidle 69is non-zero. 70 71Technical reference manuals (TRMs) and other documentation 72---------------------------------------------------------- 73 74OMAP 3430 TRM: 75<URL:http://focus.ti.com/pdfs/wtbu/OMAP34xx_ES3.1.x_PUBLIC_TRM_vZM.zip> 76Referenced 2011-03-05. 77 78OMAP 35xx TRM: 79<URL:http://www.ti.com/litv/pdf/spruf98o> Referenced 2011-03-05. 80 81OMAP 3630 TRM: 82<URL:http://focus.ti.com/pdfs/wtbu/OMAP36xx_ES1.x_PUBLIC_TRM_vQ.zip> 83Referenced 2011-03-05. 84 85DM 3730 TRM: 86<URL:http://www.ti.com/litv/pdf/sprugn4h> Referenced 2011-03-06. 87 88 89References 90---------- 91 92.. [#] http://git.ideasonboard.org/?p=media-ctl.git;a=summary 93