From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 66CFEC433F5 for ; Thu, 4 Nov 2021 08:49:03 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 29903611C1 for ; Thu, 4 Nov 2021 08:49:03 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 29903611C1 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=cerno.tech Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:Content-Type: List-Subscribe:List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id: In-Reply-To:MIME-Version:References:Message-ID:Subject:Cc:To:From:Date: Reply-To:Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date :Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=qpcjmjCn083xO8VqCJApXv6jDWO7ZwvIPYCHJBIeEe4=; b=EZwzpZ0Ths9clVAWZgXIhIv5As zlPD9Hdd787ut8RWL3kfPMnApGYweVGHCJ9sliZYScwSAuBBHODEbH8mdCUD6PR5SWqgftKHxp/ur xBVvN/+J8N+RtUWuqvyndHIVpvuAasMrheYYxM7nki334Vrm5Eb1cLhayEtkTREMk36rnmB2ImxDy fuGuLDaFlxttY0s/Wm+7cVKqKx6FiYG/cFT9oOLH00hJqkKp2ooV5XJkDyMuw1JkEZl4Rua2s/B7t rPspNuHm8LZpkpxKVOKImmGgj0LkhFb4+TSmxMudnT3xxjmVS5McFvzVk0mEeh9HcVg7pyOQ4WSYK 7x4EH/Rg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1miYQZ-008MO6-8J; Thu, 04 Nov 2021 08:48:55 +0000 Received: from new3-smtp.messagingengine.com ([66.111.4.229]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1miYQX-008MLv-21; Thu, 04 Nov 2021 08:48:54 +0000 Received: from compute6.internal (compute6.nyi.internal [10.202.2.46]) by mailnew.nyi.internal (Postfix) with ESMTP id 2D585580876; Thu, 4 Nov 2021 04:48:44 -0400 (EDT) Received: from mailfrontend2 ([10.202.2.163]) by compute6.internal (MEProxy); Thu, 04 Nov 2021 04:48:44 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=cerno.tech; h= date:from:to:cc:subject:message-id:references:mime-version :content-type:in-reply-to; s=fm1; bh=trsPLTuX5eN1+6357zkP5w+4wv/ ep/5Bf7nUaNCCfvk=; b=N6qNGXwP4tfhBg/RWUGBNA1sWDjOx7qLK/hiogyEOQv Jj1b+xa3+cboDAo7kVwCYkf3pyYcnPo+VEeZJRtjLBNiqQ+TGV53dj5uqoYgTbOO o1x17aLxL2gPcbxCkkf+ffuY+3GXKZwDiJK9NSzcnHhJdmrDCBD4cxq9DO6pVdZM EAg76+zQ4ysijBUxJNowIojZ7HmrxIpedGACWqdBXfiieZSZK6Sbyk6EnHhcNjDK I149cd67WwCrX6OCnf4oYORCa2lJGOueYeQB5o6/it1nXWTi0s/7lHJYZbaOnQEl fyhIYUE+PMxiBkdVpv2YihTmCKgwkwD5x1SJv1mSDLA== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:content-type:date:from:in-reply-to :message-id:mime-version:references:subject:to:x-me-proxy :x-me-proxy:x-me-sender:x-me-sender:x-sasl-enc; s=fm1; bh=trsPLT uX5eN1+6357zkP5w+4wv/ep/5Bf7nUaNCCfvk=; b=ECmjANenJrnyee/dKXXG1k rFFMtu6U9KJ/jnEqf+3TIoPRUyvBrP9QAMyWxLtAaWCUjI0zMlmYMSxox9TJMv9z 3IpcFsVxQ2DfHxXNTfZRufbmgEL9vV6zGu8aYTGD0/yjG6VeGv0H/cjmACoLEs// cOMRM8mGs3g7n1i+xHK9IgEH/yqOpSW+EFvRcUThlyVqDEWKVk5QeS0ms5eg+uT4 VN+LNwIh0tbZlWXSCSDKMi7V6Gn45Rd8K22xSsTQIgqr7cJkkKsLHFWkNd1b2+DT DXWG3SaWQQBdV1Q6tfEzFBswqUbJ/W64O4hEftRAOp1bcqzp7V1a7wqTMfQC6uXA == X-ME-Sender: X-ME-Received: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgedvuddrtdefgdduvddtucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfqfgfvpdfurfetoffkrfgpnffqhgen uceurghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmne cujfgurhepfffhvffukfhfgggtuggjsehgtderredttddunecuhfhrohhmpeforgigihhm vgcutfhiphgrrhguuceomhgrgihimhgvsegtvghrnhhordhtvggthheqnecuggftrfgrth htvghrnhepuddvudfhkeekhefgffetffelgffftdehffduffegveetffehueeivddvjedv gfevnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehmrghilhhfrhhomhepmh grgihimhgvsegtvghrnhhordhtvggthh X-ME-Proxy: Received: by mail.messagingengine.com (Postfix) with ESMTPA; Thu, 4 Nov 2021 04:48:42 -0400 (EDT) Date: Thu, 4 Nov 2021 09:48:41 +0100 From: Maxime Ripard To: Ville =?utf-8?B?U3lyasOkbMOk?= Cc: Emma Anholt , Neil Armstrong , David Airlie , dri-devel@lists.freedesktop.org, Andrzej Hajda , Thierry Reding , amd-gfx@lists.freedesktop.org, Benjamin Gaignard , Daniel Vetter , Phil Elwell , Jerome Brunet , Tim Gover , Dave Stevenson , Kevin Hilman , Jernej Skrabec , Jonathan Hunter , Jonas Karlman , Martin Blumenstingl , intel-gfx@lists.freedesktop.org, Rodrigo Vivi , linux-tegra@vger.kernel.org, linux-amlogic@lists.infradead.org, linux-arm-kernel@lists.infradead.org, Dom Cobley , "Pan, Xinhui" , Robert Foss , Thomas Zimmermann , Alex Deucher , Christian =?utf-8?B?S8O2bmln?= , Laurent Pinchart Subject: Re: [PATCH 01/13] drm/connector: Add define for HDMI 1.4 Maximum Pixel Rate Message-ID: <20211104084841.mjnennxgelacleaj@gilmour> References: <20211102145944.259181-1-maxime@cerno.tech> <20211102145944.259181-2-maxime@cerno.tech> MIME-Version: 1.0 In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211104_014853_223367_17D35926 X-CRM114-Status: GOOD ( 21.28 ) X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============4279950705687464334==" Sender: "linux-amlogic" Errors-To: linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org --===============4279950705687464334== Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="pxndx3anvyrc7z43" Content-Disposition: inline --pxndx3anvyrc7z43 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi Ville, On Wed, Nov 03, 2021 at 08:05:16PM +0200, Ville Syrj=E4l=E4 wrote: > On Wed, Nov 03, 2021 at 01:02:11PM +0200, Ville Syrj=E4l=E4 wrote: > > On Tue, Nov 02, 2021 at 03:59:32PM +0100, Maxime Ripard wrote: > > > --- a/drivers/gpu/drm/drm_edid.c > > > +++ b/drivers/gpu/drm/drm_edid.c > > > @@ -4966,7 +4966,7 @@ static void drm_parse_hdmi_forum_vsdb(struct dr= m_connector *connector, > > > u32 max_tmds_clock =3D hf_vsdb[5] * 5000; > > > struct drm_scdc *scdc =3D &hdmi->scdc; > > > =20 > > > - if (max_tmds_clock > 340000) { > > > + if (max_tmds_clock > DRM_HDMI_14_MAX_TMDS_CLK_KHZ) { > > > display->max_tmds_clock =3D max_tmds_clock; > > > DRM_DEBUG_KMS("HF-VSDB: max TMDS clock %d kHz\n", > > > display->max_tmds_clock); > > > diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c b/drivers/gpu/= drm/i915/display/intel_hdmi.c > > > index d2e61f6c6e08..0666203d52b7 100644 > > > --- a/drivers/gpu/drm/i915/display/intel_hdmi.c > > > +++ b/drivers/gpu/drm/i915/display/intel_hdmi.c > > > @@ -2226,7 +2226,7 @@ int intel_hdmi_compute_config(struct intel_enco= der *encoder, > > > if (scdc->scrambling.low_rates) > > > pipe_config->hdmi_scrambling =3D true; > > > =20 > > > - if (pipe_config->port_clock > 340000) { > > > + if (pipe_config->port_clock > DRM_HDMI_14_MAX_TMDS_CLK_KHZ) { > > > pipe_config->hdmi_scrambling =3D true; > > > pipe_config->hdmi_high_tmds_clock_ratio =3D true; > > > } > >=20 > > All of that is HDMI 2.0 stuff. So this just makes it all super > > confusing IMO. Nak. >=20 > So reading throgh HDMI 1.4 again it does specify 340 MHz as some kind > of upper limit for the physical cable. But nowhere else is that number > really mentioned AFAICS. HDMI 2.0 does talk quite a bit about the 340 > Mcsc limit in various places. >=20 > I wonder what people would think of a couple of helpers like: > - drm_hdmi_{can,must}_use_scrambling() > - drm_hdmi_is_high_tmds_clock_ratio() > or something along those lines? At least with those the code would > read decently and I wouldn't have to wonder what this HDMI 1.4 TMDS > clock limit really is. Patch 2 introduces something along those lines. It doesn't cover everything though, we're using this define in vc4 to limit the available modes in mode_valid on HDMI controllers not 4k-capable We could probably do better on the name, but I still believe a define like this would be valuable. Maxime --pxndx3anvyrc7z43 Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQRcEzekXsqa64kGDp7j7w1vZxhRxQUCYYOeaAAKCRDj7w1vZxhR xW31AP9ZrW1GZ894aQ+2PZr6HfCImm0k5/+iLzGrkzoNuAj3BwD/fm55lGcssQw+ lhcuuMOafgTMwGbj7Dw+tHaTcMYN7w4= =8Jzs -----END PGP SIGNATURE----- --pxndx3anvyrc7z43-- --===============4279950705687464334== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ linux-amlogic mailing list linux-amlogic@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-amlogic --===============4279950705687464334==--