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 E1D1735FF55 for ; Wed, 28 Jan 2026 13:53:27 +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=1769608409; cv=none; b=ay4fTR42fOXfQiDSanaCQxuSDUj/rdjofu0s4YXtDjsU5Wyvac9AiQ6O3HZSTMZKmsYk49I2ftXbRpMBwpbW1U238rjk04QdMZ8QOXfANO24nfIcZmw/l5VlZ2m78AH38F/c05AJzge9j+yqx74L7HBM7DwVz82/DhIQbD4TZKY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1769608409; c=relaxed/simple; bh=+Qlv2U4qvXCghxckQIlcwfkUlTLGSEG+d9GccekEIE0=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=lBzf263ghyHzqnwEYvf+FVmI5O2ddnWxVmxL/qhdd39ceOIA3g2dJokewSQ1hCd4GjtT0MRfycFgwSReKi2Ho8MA8hAPHPgcHw9gR7Inz+RIlFRwmNADsLnc5JnIwyo+WNFKEg8cu2h+CpoDPzUvs/stEgOPs2qyUJTR1AGVvMg= 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=qXNIDtEr; 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="qXNIDtEr" 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 12C90581; Wed, 28 Jan 2026 14:52:48 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1769608368; bh=+Qlv2U4qvXCghxckQIlcwfkUlTLGSEG+d9GccekEIE0=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=qXNIDtEr900QMXWNDxRxafZTBG3VU7rMxPZu6PpJyWxuyP08u70e1ep484YoN47ZI iuUIpuuvoR5VSnXFD6k6OUIqy6ZzUSLBWHtckMydC7KK8YLpXf2BvX9V/Y/PVbT65U N4Z0qsE2pv4w1620KnRLI2nq3d015SFqRbiZzxaE= Message-ID: Date: Wed, 28 Jan 2026 15:53:21 +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 v7 02/11] drm/fourcc: Add DRM_FORMAT_XV15/XV20 To: Laurent Pinchart Cc: Vishal Sagar , Anatoliy Klymenko , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , 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: <20251201-xilinx-formats-v7-0-1e1558adfefc@ideasonboard.com> <20251201-xilinx-formats-v7-2-1e1558adfefc@ideasonboard.com> <20260128122144.GJ2558360@killaraus> 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, On 28/01/2026 14:21, Laurent Pinchart wrote: > Hi Tomi, > > On Mon, Dec 01, 2025 at 02:18:44PM +0200, Tomi Valkeinen wrote: >> Add two new pixel formats: >> >> DRM_FORMAT_XV15 ("XV15") >> DRM_FORMAT_XV20 ("XV20") >> >> The formats are 2 plane 10 bit per component YCbCr, with the XV15 2x2 >> subsampled whereas XV20 is 2x1 subsampled. >> >> Reviewed-by: Dmitry Baryshkov >> Reviewed-by: Vishal Sagar >> Signed-off-by: Tomi Valkeinen >> --- >> drivers/gpu/drm/drm_fourcc.c | 6 ++++++ >> include/uapi/drm/drm_fourcc.h | 8 ++++++++ >> 2 files changed, 14 insertions(+) >> >> diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c >> index e662aea9d105..b22ef86428a1 100644 >> --- a/drivers/gpu/drm/drm_fourcc.c >> +++ b/drivers/gpu/drm/drm_fourcc.c >> @@ -381,6 +381,12 @@ const struct drm_format_info *__drm_format_info(u32 format) >> { .format = DRM_FORMAT_S416, .depth = 0, .num_planes = 3, >> .char_per_block = { 2, 2, 2 }, .block_w = { 1, 1, 1 }, .block_h = { 1, 1, 1 }, >> .hsub = 1, .vsub = 1, .is_yuv = true}, >> + { .format = DRM_FORMAT_XV15, .depth = 0, .num_planes = 2, >> + .char_per_block = { 4, 8, 0 }, .block_w = { 3, 3, 0 }, .block_h = { 1, 1, 0 }, >> + .hsub = 2, .vsub = 2, .is_yuv = true }, > > Given the horizontal subsampling, don't we have 6 pixels in 8 bytes ? No, the hsub is applied first. If you look at framebuffer_check() and the called functions, the calculations for the min_pitch for a 1920 wide XV15 buffer for the second plane is: width = frame_width / hsub min_pitch = width * char_per_block[plane] / block_w[plane] So: width = 1920 / 2 = 960 min_pitch = 960 * 8 / 3 = 2560 Tomi