From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4A9DA1E9918 for ; Wed, 15 Jan 2025 11:13:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=213.167.242.64 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736939581; cv=none; b=oiyHypJeclD7eGlpLbBvT2H58rIyet99DInUrQQYN7QAosQnjtS5417pluMcA7DWkdUWP1mIi3URA5OgiSDIC/OtW1Y8sqYecMv/gQynGnk56XPRMdRUHZ5irXeNRBrfPgWuTUkC2PQTwOHA8CIQhTNBmqgZ1uYwn8lkMg63xp0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736939581; c=relaxed/simple; bh=kObbrxjliZtOR3xfmSNN6n5lEiuI5gMBVSXSAoB8qE4=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=bdwYR/5oE7+LQ2dYzShSugr/WHOhBoXTWf26V90iAGEKmqCBD0QPKTRqvV0hVtwOW+q7e8gweA9pC0uDCdZNItpzDEohNUqM/roHq7gzc5enWfjuim+l8rcx1pysAfTK74wqi2PLViphorpTRYp+1A6IrzqJaqDcvEKo9pHlwF8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com; spf=pass smtp.mailfrom=ideasonboard.com; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b=hha11TRW; arc=none smtp.client-ip=213.167.242.64 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="hha11TRW" 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 2E7344AD; Wed, 15 Jan 2025 12:11:59 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1736939519; bh=kObbrxjliZtOR3xfmSNN6n5lEiuI5gMBVSXSAoB8qE4=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=hha11TRW1HbGOWWKl54J9R4Ms2eKVkhzXUWjetuOY7Q6wmecoKIt4qxDmLd/Rcfbh 4C9llHIcjyQO20t8BcP9Dp32fulgVOpdhRCq8AwVgKRiWmDiR2XNM+dit4Cj0IfuPB CNZNhMalxnaLC2b/vL7sSQCXQmrSjCIr62EGQrjo= Message-ID: Date: Wed, 15 Jan 2025 13:12:54 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 03/10] 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 References: <20250115-xilinx-formats-v2-0-160327ca652a@ideasonboard.com> <20250115-xilinx-formats-v2-3-160327ca652a@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: 8bit Hi, On 15/01/2025 12:30, Geert Uytterhoeven wrote: > Hi Tomi, > > On Wed, Jan 15, 2025 at 10:04 AM Tomi Valkeinen > wrote: >> Add greyscale Y8 format. >> >> 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 */ > > I don't think you need this. We already have: > > /* 8 bpp Red (direct relationship between channel value and brightness) */ > #define DRM_FORMAT_R8 fourcc_code('R', '8', ' ', ' ') /* > [7:0] R */ > > See also commit 8aba4d30520ed656 ("drm/fourcc: Clarify the meaning of > single-channel "red""). Yes, I discuss this topic in the cover letter. Tomi