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 A8FF820764C for ; Wed, 15 Jan 2025 11:11:59 +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=1736939521; cv=none; b=XDu5cvZ5gOyBTIz41EzHmIt1hnoP5o2xxf9juo6VWcj3N/gndoiSbeELUx6MU7Y/IQ7lmmkKT7B7YY7FtxTTbEjTUiIckilyrhvbTMEdYkbXSj5gxJm+j2clxqH21oQum+bGIcAqNr3aNlLTCLeWcXRu5vSx66AcHDaIGYELqb4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736939521; c=relaxed/simple; bh=kWmByKKrK7Xu9tnl8VAbPLeyhynqUtnjbWqA4h0alJs=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=PxVkYoScme1ZaKtE1m1hl731vCLd5j8kNH1dHIZyOZzt2kcK0FZWcOiUDKH/Fn/BDlaC/WyQUAExOmEm8ycMoPorN8ypxW5Zz3JkX9fugBgOUrVGf80BxhVRdTcQ+mLwS9uBro2UXuPoBoK8yWeYAn7rTlOBLim38ezTLCQF/sE= ARC-Authentication-Results:i=1; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Hi, On 15/01/2025 12:33, Geert Uytterhoeven wrote: > Hi Tomi, > > 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. 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. Tomi