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