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 0D5E62475D9 for ; Wed, 15 Jan 2025 12:42:22 +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=1736944944; cv=none; b=HNhHEk3toSdZefcB6WuMrhXFoC/ajTe1VAyudlTAjRj2bPDciRhputdVlp+RxExmBGoZmWH+n4KxdCGUTt0KZLKuEqfRWJFrihl/aqIl3wHMocczu3U6Tj0ImMsNmUZQ4jfqGo7g9nv3L+twCEO96aiM4isg0r6RQ7Zn9FfEQp4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736944944; c=relaxed/simple; bh=PW6tFzWatBuI4LYcToa+SLmBwEqk4hXBwvl+o/oaTXM=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=Y73fX25uFmXkJzgF5ME+E0+hpl+KV22F/Kht6dxJN4Pxxw0VVSYb58UVost0uuyDxjJRISQ2qVgGLAh51uExw0+RZf3DWaMe8aaD8kLFfDebhvolimOMdkwM7YqXY5h/LkzD++MqdmHuT0w5OKIVbiK+dRXec5QrmDpYsu/UAy0= 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=GpULfFlk; 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="GpULfFlk" 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 923AC526; Wed, 15 Jan 2025 13:41:22 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1736944883; bh=PW6tFzWatBuI4LYcToa+SLmBwEqk4hXBwvl+o/oaTXM=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=GpULfFlkWJPKoO3Gl1abiMAr9x4xDruZWcAcj19fHaT57uofo81Kcim64YJBRqVVc dA3xI12nb5m/lv343N7yyqXtzwjSMEmQyZDyH3KSdyq9HFFBDLoLpn+sj0qsXLlbIo jfOPiZkQ5se8W+Q/In6K3S0z8lKkMr4O7AuQmwxE= Message-ID: <6b084e2c-100f-4563-8797-9fd6c862ed0c@ideasonboard.com> Date: Wed, 15 Jan 2025 14:42:18 +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 04/10] drm/fourcc: Add DRM_FORMAT_Y10_LE32 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-v2-4-160327ca652a@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 14:33, Geert Uytterhoeven wrote: > Hi Tomi, > > On Wed, Jan 15, 2025 at 12:11 PM Tomi Valkeinen > wrote: >> On 15/01/2025 12:33, Geert Uytterhoeven wrote: >>> On Wed, Jan 15, 2025 at 10:04 AM Tomi Valkeinen >>> wrote: >>>> Add Y10_LE32, a 10 bit greyscale format, with 3 pixels packed into >>>> 32-bit container. >>>> >>>> Signed-off-by: Tomi Valkeinen >>> >>> Thanks for your patch! >>> >>>> --- a/include/uapi/drm/drm_fourcc.h >>>> +++ b/include/uapi/drm/drm_fourcc.h >>>> @@ -408,6 +408,7 @@ extern "C" { >>>> /* Greyscale formats */ >>>> >>>> #define DRM_FORMAT_Y8 fourcc_code('G', 'R', 'E', 'Y') /* 8-bit Y-only */ >>>> +#define DRM_FORMAT_Y10_LE32 fourcc_code('Y', 'P', 'A', '4') /* [31:0] x:Y2:Y1:Y0 2:10:10:10 little endian */ >>> >>> R10_LE32? Or R10_PA4? >> >> Can we discuss the "R" vs "Y" question under the cover letter? There's >> some more context about it in there. > > Sorry, hadn't read the cover letter. I got attracted by "Y8" and "Y10". > >> I took the "LE32" from Gstreamer's format. Maybe it's a bit pointless. >> >> I don't know if it makes sense to add the fourcc to the DRM format name. >> The fourcc is very limited. Rather, we could, say, have >> DRM_FORMAT_Y10_PACKED_32 (or "R", if you insist =). >> >>> Does LE32 have a meaning? My first guess just reading the subject >>> was wrong ("little endian 32-bit" ;-) >> >> I'm not sure I follow. It's little-endian. The pixel group/unit is a >> 32-bit number, where the leftmost pixel on the screen is in bits 9-0, >> and the padding is in bits 31-30, and stored in memory as little-endian. > > Ah, the "LE" applies to the pixels inside each word. No, to the 32-bit container. > DRM formats stored in memory are always little-endian, unless the > DRM_FORMAT_BIG_ENDIAN bit is set, which is what I was hinting > at... Indeed you're right. The "LE" is pointless. So back to the bike-shedding about the name =). Tomi