Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752602AbdCSTwh (ORCPT ); Sun, 19 Mar 2017 15:52:37 -0400 Received: from mail-pf0-f193.google.com ([209.85.192.193]:34161 "EHLO mail-pf0-f193.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752313AbdCSTwf (ORCPT ); Sun, 19 Mar 2017 15:52:35 -0400 Subject: Re: [PATCH v5 00/39] i.MX Media Driver To: Russell King - ARM Linux References: <1489121599-23206-1-git-send-email-steve_longerbeam@mentor.com> <20170318192258.GL21222@n2100.armlinux.org.uk> <20170319121402.GS21222@n2100.armlinux.org.uk> <6e2879a0-1f2e-9da7-b7e1-d134a0301ca2@gmail.com> <20170319185132.GY21222@n2100.armlinux.org.uk> Cc: Steve Longerbeam , mark.rutland@arm.com, andrew-ct.chen@mediatek.com, minghsiu.tsai@mediatek.com, sakari.ailus@linux.intel.com, nick@shmanahar.org, songjun.wu@microchip.com, hverkuil@xs4all.nl, pavel@ucw.cz, robert.jarzmik@free.fr, devel@driverdev.osuosl.org, markus.heiser@darmarIT.de, laurent.pinchart+renesas@ideasonboard.com, shuah@kernel.org, geert@linux-m68k.org, linux-media@vger.kernel.org, devicetree@vger.kernel.org, kernel@pengutronix.de, arnd@arndb.de, mchehab@kernel.org, bparrot@ti.com, robh+dt@kernel.org, horms+renesas@verge.net.au, tiffany.lin@mediatek.com, linux-arm-kernel@lists.infradead.org, niklas.soderlund+renesas@ragnatech.se, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, jean-christophe.trotin@st.com, p.zabel@pengutronix.de, fabio.estevam@nxp.com, shawnguo@kernel.org, sudipm.mukherjee@gmail.com From: Steve Longerbeam Message-ID: <7cd11fe4-642b-167b-d719-ce0f207441f8@gmail.com> Date: Sun, 19 Mar 2017 11:56:06 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.7.0 MIME-Version: 1.0 In-Reply-To: <20170319185132.GY21222@n2100.armlinux.org.uk> Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1953 Lines: 43 On 03/19/2017 11:51 AM, Russell King - ARM Linux wrote: > On Sun, Mar 19, 2017 at 11:37:15AM -0700, Steve Longerbeam wrote: >> On 03/19/2017 05:14 AM, Russell King - ARM Linux wrote: >>> Right now, CSI doesn't do that - it only looks at the width, height, >>> code, and field. >> Correct, there is currently no propagation of the colorimetry >> parameters (colorspace, ycbcr_enc, quantization, and xfer_func). >> For the most part, those are just ignored ATM. Philipp Zabel did >> do some work earlier to start propagating those, but that's still >> TODO. > >>> I think we've got other bugs though that haven't been picked up by any >>> review - csi_try_fmt() adjusts the format using the _current_ >>> configuration of the sink pad, even when using V4L2_SUBDEV_FORMAT_TRY. >>> This seems wrong according to the docs: the purpose of the try >>> mechanism is to be able to setup the _entire_ pipeline using the TRY >>> mechanism to work out whether the configuration works, before then >>> setting for real. If we're validating the TRY formats against the >>> live configuration, then we're not doing that. >> I don't believe that is correct. csi_try_fmt() for the source pads calls >> __csi_get_fmt(priv, cfg, CSI_SINK_PAD, sdformat->which) to get >> the sink format, and for the TRY trial-run from csi_set_fmt(), >> sdformat->which will be set to TRY, so the returned sink format >> is the TRY format. > Look at csi_try_fmt() - it validates the source pad against > priv->crop, which is the actively live cropping rectangle, not the > one which has been configured for the TRY trial-run. Ah yes, crop, I missed that. Yes you are right, looks like we need to add a __csi_get_crop(). > > Also, as I mention elsewhere, I believe the way we're doing scaling > is completely wrong... You might be right there too. Initially, I had no support for the down-scaling in the CSI. That was added later by Philipp, I will respond with more there... Steve