From patchwork Sun May 3 22:06:15 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Janusz Krzysztofik X-Patchwork-Id: 11524819 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id F1B2D139A for ; Sun, 3 May 2020 22:06:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CF7B92071C for ; Sun, 3 May 2020 22:06:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="iQxUxbXs" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729151AbgECWG2 (ORCPT ); Sun, 3 May 2020 18:06:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40910 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1729114AbgECWG2 (ORCPT ); Sun, 3 May 2020 18:06:28 -0400 Received: from mail-lj1-x243.google.com (mail-lj1-x243.google.com [IPv6:2a00:1450:4864:20::243]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id F1A65C061A0E for ; Sun, 3 May 2020 15:06:27 -0700 (PDT) Received: by mail-lj1-x243.google.com with SMTP id l19so7790571lje.10 for ; Sun, 03 May 2020 15:06:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=1qvQZLQ9Ocn5BT5rKJbgCkko2+QnRK5NoPOfGe0E6cQ=; b=iQxUxbXsTKTGqhFEcCOmGghNRTglAVQwrXfEN2RLqd1O7dbn/MfZ5N7NVIjRrvMB36 A5qE26vH7EPfZc65nKI61u1AziO2w13ZxFS4DIX92jw858HXrV01pfRpPt9iZPnkO0jW wWNGg9i3hS74Zd4XH80xjGB6+y6eyu75pKCcCikGGD4ySuyOjIPRVl4MxySebQjkbJ4T Ppos1m8OhFqOOXl6hLlQGZ9+RRsrXDcwurwt2Slzdr5rv+hTLIVNPWXNUNrwiC0pbtJr lLCv4qGBFHfRpu+m2del75FUpiSj2ZzCkTs8UeR4bnBI8pRx8a/vJpnokocluDUGo6I0 pogw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=1qvQZLQ9Ocn5BT5rKJbgCkko2+QnRK5NoPOfGe0E6cQ=; b=hy2f0EK0sSby0iaDvjvhHlogRYWpPch6+V92N3fqC7UJj6ZSpxbnXM1YrGppUcE1Ql qtBjdoO0g6KP6WL0+IeDDFDVjcwzn4nVn+6Cjtd1ufNpzBSB0Y37P+k0CJUEpWr9xVX2 FABoklg49xYn9o6zFrNR0eAHHrpt5NPhY74+C0EYzqjsasD6BtyfAln9jgyo13Ly9kCf 3GCrC6AQPhVCpazhXeEZCxWXrGC/PHvganDH4aPTxz7HpxgOR+3YqZomgP4PDFNuiQOJ T0BbwKaidcNfLIPur0eDhqEGAF2tOiZz5qwRf8LUJJoCQoUf+Ekw65O93W+vEx4LmH7u A+gQ== X-Gm-Message-State: AGi0PuYQzXho/nUON1s0PLbMviEvl3pFH5W03xHe15FmoHSpoij/KiHV 0PVvbEN3qyllfbbL96++NMU= X-Google-Smtp-Source: APiQypIYPMMl1dWIQHXkPjvs3fpkc5xSBFuqUJW5rl/04Y67U3aWJDxWnkB36j+lZ3jj02SoRkRG9g== X-Received: by 2002:a2e:7301:: with SMTP id o1mr8136503ljc.264.1588543586083; Sun, 03 May 2020 15:06:26 -0700 (PDT) Received: from z50.gdansk-morena.vectranet.pl (109241122244.gdansk.vectranet.pl. [109.241.122.244]) by smtp.gmail.com with ESMTPSA id 16sm6637433ljr.55.2020.05.03.15.06.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 03 May 2020 15:06:25 -0700 (PDT) From: Janusz Krzysztofik To: Sakari Ailus , Hans Verkuil Cc: linux-media@vger.kernel.org, Janusz Krzysztofik Subject: [PATCH 0/3] media: ov6650: Fix crop rectangle affected by set format Date: Mon, 4 May 2020 00:06:15 +0200 Message-Id: <20200503220618.27743-1-jmkrzyszt@gmail.com> X-Mailer: git-send-email 2.24.1 MIME-Version: 1.0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org According to subdevice interface specification found in V4L2 API documentation, set format pad operations should not affect image geometry set in preceding image processing steps. Unfortunately, that requirement is not respected by the driver implementation of set format as it was not the case when that code was still implementing a pair of now obsolete .s_mbus_fmt() / .try_mbus_fmt() video operations before they have been merged and reused as an implementation of .set_fmt() pad operation by commit 717fd5b4907a ("[media] v4l2: replace try_mbus_fmt by set_fmt"). In case of set format active processing path the issue can be fixed easily by excluding a call to set active selection from that path. That will effectively limit frame size processing to optimal frame scaling against active crop rectangle without touching it. Users can just call set active selection themselves to obtain desired frame size. However, set format try processing path needs more work. First of all, the driver should be extended with set try selection support. Lack of it constraints video device drivers to not use subdevice cropping at all while processing user requested active frame size, otherwise their set try format results might differ from active. Next, set format try processing path should use pad config crop rectangle as a reference, not the active one as it does now. That issue can be resolved easily as soon as set try selection support is added to the driver so pad config crop rectangle can be maintained by users via selection API. Last, set format try processing path should give the same results as active in respect to active vs. pad config crop rectangle geometry. Both rectangles should be either not touched by set format (that's what we are going to achieve) or modified the same way, otherwise users won't be able to obtain equal results from both paths while iterating through set format and set selection operations in order to obtain desired frame size. We can't begin with modifying set format pad operation as not to touch crop rectangle since that depends on availability of set try selection for symmetry. Neither can we begin with adding set try selection since that in turn depends on equal handling of active and pad config crop rectangles by set format. We can either implement all required modifications in a single patch, or begin with fixing current set format try processing path to appropriately handle pad config crop rectangle. This series implements the latter approach as believed to be more readable. However, the patches can be squashed if so decided by subsystem maintainers. Janusz Krzysztofik (3): media: ov6650: Fix set format try processing path media: ov6650: Add try support to selection API operations media: ov6650: Fix crop rectangle affected by set format drivers/media/i2c/ov6650.c | 115 ++++++++++++++++++++++--------------- 1 file changed, 70 insertions(+), 45 deletions(-)