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 03723391E43 for ; Fri, 20 Mar 2026 10:37:37 +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=1774003059; cv=none; b=P93AHRUwE6803WXX4peQ5cyTuvcEGDwCwyVucfFynQlFAQFsX8byfuPC6MtATbIm5VPLg3YGhnlN/2DGXHfcJRse853UfHYBMQRG2Y7//TiGwMxn+sfOvbiRNlBHyusYOAORHhvauskzjjMQVj91JNF5OPhqv7aeG1VEI+UzDvQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774003059; c=relaxed/simple; bh=jhAADc+0DZbRNH4kx2Gi4+kamUCIz0KqMXCfR+opDIg=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=p29bdNQgDE4S+AzrRotl5DDxmTh8/RttXzJpx7QdkW0Xy9Bwt1AIwnvLViHiU8RrBacOT/dTdYeBoEnCoDGYCs0lfovEUMNb21LGZEjtaV1AiOXWjmT8tMTSEmnldMdPJFn7Cz/LO/KlHrZfYBDrtKNQbgjeIfziGZwCIz6ffSo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (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=JjFRgCgN; arc=none smtp.client-ip=213.167.242.64 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (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="JjFRgCgN" 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 7F4858D4; Fri, 20 Mar 2026 11:36:20 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1774002981; bh=jhAADc+0DZbRNH4kx2Gi4+kamUCIz0KqMXCfR+opDIg=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=JjFRgCgN9dD+l5Vc4eqEV2UKMnHjtJJgb/3BvLx1Jdvy6ScgS5ZJkd9Y6S5ezpay7 mG4PcnVV6QrbNZ/fKb6tVXA5XwSNGir8fa3tepsmPPGCWjCqSfcRJKLyOfN3PJcOv4 QBaerBIixrI9bCnSBVF3TnsKVBsGQdm/aEFjek0E= Message-ID: <67120b18-8763-4b93-b89f-7f919f38e08e@ideasonboard.com> Date: Fri, 20 Mar 2026 12:37:31 +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 v8 02/11] drm/fourcc: Add DRM_FORMAT_XV15/XV20 To: Simon Ser , Dave Stevenson 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, Geert Uytterhoeven , Dmitry Baryshkov , Pekka Paalanen , Dmitry Baryshkov References: <20260128-xilinx-formats-v8-0-9ea8adb70269@ideasonboard.com> <20260128-xilinx-formats-v8-2-9ea8adb70269@ideasonboard.com> From: Tomi Valkeinen Content-Language: en-US Autocrypt: addr=tomi.valkeinen@ideasonboard.com; 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charset=UTF-8 Content-Transfer-Encoding: 7bit Hi Simon, Dave, On 19/03/2026 17:15, Simon Ser wrote: > What is the difference between DRM_FORMAT_XV15 and DRM_FORMAT_P030? Good question. I thought the Cr & Cb are swapped between those formats. The VC4 driver uses HVS_PIXEL_ORDER_XYCBCR define, and the comment in drm_fourcc.h starts with "YCbCr420". So, CbCr. But then the comments then continue with CrCb. XV15/20 isn't super clear either, starting with "YCrCb" but then "Cb:Cr plane". The components in the plane descriptions look identical though, hinting they are the same. So to be sure, I tested it: I had test pattern support for XV15/20 in pykms, which I can test on a Xilinx board. P030 is a bit more difficult, as on RPi5 it requires DRM_FORMAT_MOD_BROADCOM_SAND128. But with a linear -> SAND128 converter, I was able to test linear NV12 converted to NV12+SAND128 and shown on the screen (just for reference), and similarly linear XV15 -> P030+SAND128. And, indeed, the linear XV15 test pattern shows correctly on screen when converted to SAND128. So afaics XV15 is indeed identical to P030, and I can drop XV15. This then brings up the question about XV20. That format doesn't exist yet, but should it then be named similarly to P030? However, I have no idea what P030 means, so I don't know what a 2x1 subsampled P030 would be called... Thoughts/ideas? Or just keep XV20? Tomi