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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 61F38C36008 for ; Wed, 26 Mar 2025 14:11:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date: Message-ID:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=qXFjV+uMncw3Aw5pFmYHPgIvZXTSHDrDVGaTRwisUfM=; b=lFJBqUBu9mVEKboZq1GLCdyzIf dCg112w8hZ5zehxjFR+gDeLwMcSK6BM+AlrjSx0pnYqwBC7Y5HDETn6qJVt0ZhGMQ6VKpYR6fMStS Jv2F0jHaMDd2x1epjIpMw8BWFXHrC1TvL9PjrbSt/1zywSE8wf8W7GxEfwJFFp2wJxxyWjbwWTViF r+MqP95Qqvj0iK8jPT9d6T1XgPPIzZybKix8Gwu/BI0AR09ow5B3/S60OdujdliD0hSfffl3TE8OX F3yxPh0n3yBwDm+r84lhBnXthEPCJbgjJMlHIIkaqDnb9/KMULvog2LA/d0BLPDg+lz1V1lZqYpwt m3cxB2ug==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.1 #2 (Red Hat Linux)) id 1txRTE-00000008eT2-2Rmj; Wed, 26 Mar 2025 14:11:04 +0000 Received: from perceval.ideasonboard.com ([213.167.242.64]) by bombadil.infradead.org with esmtps (Exim 4.98.1 #2 (Red Hat Linux)) id 1txRE3-00000008cJu-17ad for linux-arm-kernel@lists.infradead.org; Wed, 26 Mar 2025 13:55:25 +0000 Received: from [192.168.88.20] (91-158-153-178.elisa-laajakaista.fi [91.158.153.178]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 36CB73A4; Wed, 26 Mar 2025 14:53:33 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1742997213; bh=69eeOl+rqDcMgL5nasI+GLSqL+xt95L5Op1jHl1CdVQ=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=B+75UxyxbOv48FxlusrON0LgtLjPoJMnRt9CmM8R/cr7ZdHFKirKJbbbo+2qAY4yN fbfSvflH5MERyBQoS2Yv4BKv236MQ0hkm12Dhb2rpHAAh4/jCT5IkCQNjfW/4+DzcJ kgBUCGVKdHJpkmv7AdhzW2YMIvi2iY0GTL8zN5nU= Message-ID: Date: Wed, 26 Mar 2025 15:55:18 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v4 03/11] drm/fourcc: Add DRM_FORMAT_Y8 To: Geert Uytterhoeven Cc: Vishal Sagar , Anatoliy Klymenko , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Laurent Pinchart , Michal Simek , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Dmitry Baryshkov , Dmitry Baryshkov References: <20250326-xilinx-formats-v4-0-322a300c6d72@ideasonboard.com> <20250326-xilinx-formats-v4-3-322a300c6d72@ideasonboard.com> Content-Language: en-US From: Tomi Valkeinen Autocrypt: addr=tomi.valkeinen@ideasonboard.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250326_065523_454572_30E8D4AF X-CRM114-Status: GOOD ( 13.65 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi, On 26/03/2025 15:52, Geert Uytterhoeven wrote: > Hi Tomi, > > On Wed, 26 Mar 2025 at 14:23, Tomi Valkeinen > wrote: >> Add greyscale Y8 format. >> >> Acked-by: Dmitry Baryshkov >> Signed-off-by: Tomi Valkeinen > > Thanks for your patch! > >> --- a/include/uapi/drm/drm_fourcc.h >> +++ b/include/uapi/drm/drm_fourcc.h >> @@ -405,6 +405,9 @@ extern "C" { >> #define DRM_FORMAT_YUV444 fourcc_code('Y', 'U', '2', '4') /* non-subsampled Cb (1) and Cr (2) planes */ >> #define DRM_FORMAT_YVU444 fourcc_code('Y', 'V', '2', '4') /* non-subsampled Cr (1) and Cb (2) planes */ >> >> +/* Greyscale formats */ >> + >> +#define DRM_FORMAT_Y8 fourcc_code('G', 'R', 'E', 'Y') /* 8-bit Y-only */ > > This format differs from e.g. DRM_FORMAT_R8, which encodes > the number of bits in the FOURCC format. What do you envision > for e.g. DRM_FORMAT_Y16? fourcc_code('G', 'R', '1', '6')? I wanted to use the same fourcc as on V4L2 side. Strictly speaking it's not required, but different fourccs for the same formats do confuse. So, generally speaking, I'd pick an existing fourcc from v4l2 side if possible, and if not, invent a new one. Tomi