From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 60F7735CB68; Mon, 23 Feb 2026 10:58:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771844323; cv=none; b=dS6hluTPs6G0/3qhctDPnOufiMGqQVOccvsdAMqHbFO/y+aGznwSckGL4FPnK0o7zdyime7MpSDJYWr0p89PbINqRwFUkVhOgWHtZVTQbEEjQexRADSKci1zwm8+CHrOqmeeBJe19+/1zYzMvRQKlGNWksAH7Xiw5alXD3y7xtE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1771844323; c=relaxed/simple; bh=QeUhpW5ZHW9W03OdaYVWS7lJzgfUrHq85mrNLwMR8Vk=; h=Message-ID:Date:From:To:Subject:In-Reply-To:References:Cc; b=MompLu6zhoV5RfJY0cMWGoP8KlLUZbtXKME872uJE7Nde4JUA3ixhygacxTQjubPRkpwb4Rh1TGlCgD9+h6CElxoLJ5UDXJtuKbF1g+oiCH26T8szQBD1WqBmufSftHlgiK04EID0S0J9Y19Cs30HG3v1WqW0Sr4fK4kqcQ9WUU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=aj1Uq+jE; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="aj1Uq+jE" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 725D0C116C6; Mon, 23 Feb 2026 10:58:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1771844323; bh=QeUhpW5ZHW9W03OdaYVWS7lJzgfUrHq85mrNLwMR8Vk=; h=Date:From:To:Subject:In-Reply-To:References:Cc:From; b=aj1Uq+jELXnhsmWirdvYXtFjNwW/Rep8UbqYN8xtGttRFRcgPABYThU4kqtQkUdbj oCqFah1xawKiFHLvUx6BSDEPpDEZ7HHvL+qDCu6x/+KA4b+n8b5kCJoC3mlSQgZ2kH mvA3ltgbo0NBovsEGT473nQ1rM/uAPc4+YnGeg2vsTSkzfcH9YSzsb9CiXJVEMixKp MzqbqwwuakbbHRHvg/Ro0rT/FftY1XwvnF5vWJpUlvXwMyINy9SWC6K+e07O57JDr6 lGWLTC4WQnN8g/KM6SMVUFBGl/raTGAmbutKnkh9uvHRLf8g+vniJA6mj6FMrsYVwb bnXy15uAZMPeg== Message-ID: <37669584817bdca3d569e80047c94949@kernel.org> Date: Mon, 23 Feb 2026 10:58:40 +0000 From: "Maxime Ripard" To: "Nicolas Frattaroli" Subject: Re: [PATCH v8 06/20] drm/display: hdmi-state-helper: Try subsampling in mode_valid In-Reply-To: <20260216-color-format-v8-6-5722ce175dd5@collabora.com> References: <20260216-color-format-v8-6-5722ce175dd5@collabora.com> Cc: amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, kernel@collabora.com, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rockchip@lists.infradead.org, "Alex Deucher" , "Andrzej Hajda" , "Andy Yan" , =?utf-8?b?Q2hyaXN0aWFuIEvDtm5pZw==?= , "David Airlie" , "Dmitry Baryshkov" , "Harry Wentland" , =?utf-8?b?SGVpa28gU3TDvGJuZXI=?= , "Jani Nikula" , "Jernej Skrabec" , "Jonas Karlman" , "Jonathan Corbet" , "Joonas Lahtinen" , "Laurent Pinchart" , "Leo Li" , "Maarten Lankhorst" , "Maxime Ripard" , "Neil Armstrong" , "Rob Herring" , "Robert Foss" , "Rodrigo Siqueira" , "Rodrigo Vivi" , "Sandy Huang" , "Sascha Hauer" , "Simona Vetter" , "Thomas Zimmermann" , "Tvrtko Ursulin" Content-Transfer-Encoding: 7bit Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: On Mon, 16 Feb 2026 14:01:20 +0100, Nicolas Frattaroli wrote: > drm_hdmi_connector_mode_valid assumes modes are only valid if they work > with RGB. The reality is more complex however: YCbCr 4:2:0 > chroma-subsampled modes only require half the pixel clock that the same > mode would require in RGB. > > > [ ... ] Reviewed-by: Maxime Ripard Thanks! Maxime