From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.9 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3222CFC6183 for ; Fri, 14 Sep 2018 14:27:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E0E7B20861 for ; Fri, 14 Sep 2018 14:27:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="ZXF/CEvT" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E0E7B20861 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728148AbeINTln (ORCPT ); Fri, 14 Sep 2018 15:41:43 -0400 Received: from perceval.ideasonboard.com ([213.167.242.64]:36676 "EHLO perceval.ideasonboard.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727628AbeINTln (ORCPT ); Fri, 14 Sep 2018 15:41:43 -0400 Received: from localhost.localdomain (cpc89242-aztw30-2-0-cust488.18-1.cable.virginm.net [86.31.129.233]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 4E906B91; Fri, 14 Sep 2018 16:26:56 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1536935216; bh=EmhaZQSNCJXPbO457Siv39Ut3dbpHKuL0RExoSK48sc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ZXF/CEvTKzQtJ/wHgWzbgrlmo1AQJAHQpF0SFf/nf+81FHSBIa720pd99X5/VKuCG ciHyNGUC8VuKYFNZ3vYMyJTjR3KP3/5z37XTBvd2mVa4MyFq/SXYwnjFnFeM6A3xoX rFZScsUAATT1Q3djDp69OnH585vFQxmX/8UjgZLE= From: Kieran Bingham To: Laurent Pinchart , mchehab@kernel.org Cc: linux-media@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org, Kieran Bingham , Kieran Bingham Subject: [PATCH v2 2/2] media: vsp1: Document max_width restriction on UDS Date: Fri, 14 Sep 2018 15:26:52 +0100 Message-Id: <20180914142652.30484-2-kieran.bingham+renesas@ideasonboard.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180914142652.30484-1-kieran.bingham+renesas@ideasonboard.com> References: <20180914142652.30484-1-kieran.bingham+renesas@ideasonboard.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The UDS is currently restricted based on a partition size of 256 pixels. Document the actual restrictions, but don't increase the implementation. The extended partition algorithm may later choose to utilise a larger partition size to support overlapping partitions which will improve the quality of the output images. Signed-off-by: Kieran Bingham --- drivers/media/platform/vsp1/vsp1_uds.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/media/platform/vsp1/vsp1_uds.c b/drivers/media/platform/vsp1/vsp1_uds.c index 75c613050151..e8340de85813 100644 --- a/drivers/media/platform/vsp1/vsp1_uds.c +++ b/drivers/media/platform/vsp1/vsp1_uds.c @@ -342,6 +342,14 @@ static unsigned int uds_max_width(struct vsp1_entity *entity, UDS_PAD_SOURCE); hscale = output->width / input->width; + /* + * The maximum width of the UDS is 304 pixels. These are input pixels + * in the event of up-scaling, and output pixels in the event of + * downscaling. + * + * To support overlapping parition windows we clamp at units of 256 and + * the remaining pixels are reserved. + */ if (hscale <= 2) return 256; else if (hscale <= 4) -- 2.17.1