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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 6B9BEC5478C for ; Fri, 1 Mar 2024 12:12:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding: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-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=7+NPu+CT5uOREY7QfBtcMTq+6XPaSG7Fre0Cbeb/7HM=; b=BUIu5yyLYo3OLq QflfE3+gtKhxhqEx4mowdRM3xv8Mt+1/zi823cWnRXaw8hNKvC1wsrdHSE9yML5JWxsk3YJeTjs3o 7ws/gH5sp1Rk9slHsFnpQtOfMEbADvwJF7X6GgjmtZEZdK88LlpnAn2F8vKyqsStXC18XLf+ryYQ/ zlX6sxsp+yO+pw3FFaSbCARfUvdCNodbv7+PqBA7Tx8L4LVIULV5Jkf/w7z3jbB2QlQWuydFzbkhG blK8cPYaVGkeUxZ8cw5GySUW4ZHwiM5seVg0WbmibTpqi7437pFM7c8iNcYodDSpswYgzKPamAlPr o8j63QKr5ilqzL+AjlyA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1rg1kI-0000000079E-0ZGf; Fri, 01 Mar 2024 12:12:10 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1rg1kD-0000000077X-2KbU; Fri, 01 Mar 2024 12:12:08 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id E2E316101F; Fri, 1 Mar 2024 12:12:04 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5CE13C43390; Fri, 1 Mar 2024 12:12:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1709295124; bh=6E5qCAMa5baRaHUWMvXXQI+RrvNsgn7wLP4NhDm0xqM=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=oA08poAphN0lZAIQQq2SGgzG3xggzAQadZkfPaCm/Hu8g9cM/T4l3JdOqaYOkxWl9 vrqvj9vAvv+3MFp1p5/mtabU/57iOutCJziDcrIJYbMln3emj+hQUeVjpTN3lw8hyd DqYNXY7Pe42dfO9kjTSsy2TNv872hwWtUKuvBqgMrvoFQL5290xX0k5fd2/PUkajDW NhqU/v8Z7ZXb4qhzyA220yicASsbi5YThFJqVW8YgUPMv/mzc7ZUkuLBxas48Pldb6 +hMe7ue4KokCYLS8ArfwOI4F6fZ2+SCQUof3riITI7VglYH26eAgQ10sqxPfzjIpPj rPBGFlAlB3Q2Q== Date: Fri, 1 Mar 2024 13:12:02 +0100 From: Maxime Ripard To: Sebastian Wick Cc: Maarten Lankhorst , Thomas Zimmermann , David Airlie , Daniel Vetter , Jonathan Corbet , Sandy Huang , Heiko =?utf-8?Q?St=C3=BCbner?= , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Hans Verkuil , Ville =?utf-8?B?U3lyasOkbMOk?= , dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-media@vger.kernel.org, linux-rockchip@lists.infradead.org, linux-sunxi@lists.linux.dev, Dave Stevenson Subject: Re: [PATCH v7 21/36] drm/connector: hdmi: Add Broadcast RGB property Message-ID: <20240301-loyal-cornflower-oxpecker-83ed59@houat> References: <20240222-kms-hdmi-connector-state-v7-0-8f4af575fce2@kernel.org> <20240222-kms-hdmi-connector-state-v7-21-8f4af575fce2@kernel.org> <20240229194726.GB166694@toolbox> <20240301-light-impressive-grasshopper-adabeb@houat> <20240301112941.GE166694@toolbox> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20240301112941.GE166694@toolbox> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240301_041205_746203_14047642 X-CRM114-Status: GOOD ( 21.86 ) X-BeenThere: linux-arm-kernel@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: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Mar 01, 2024 at 12:29:41PM +0100, Sebastian Wick wrote: > On Fri, Mar 01, 2024 at 11:30:56AM +0100, Maxime Ripard wrote: > > On Thu, Feb 29, 2024 at 08:47:26PM +0100, Sebastian Wick wrote: > > > > @@ -1708,6 +1731,39 @@ EXPORT_SYMBOL(drm_connector_attach_dp_subconnector_property); > > > > /** > > > > * DOC: HDMI connector properties > > > > * > > > > + * Broadcast RGB (HDMI specific) > > > > + * Indicates the Quantization Range (Full vs Limited) used. The color > > > > + * processing pipeline will be adjusted to match the value of the > > > > + * property, and the Infoframes will be generated and sent accordingly. > > > > + * > > > > + * This property is only relevant if the HDMI output format is RGB. If > > > > + * it's one of the YCbCr variant, it will be ignored and the output will > > > > + * use a limited quantization range. > > > > > > Uh, maybe just say that the quantization range is selected automatically > > > in case a YCbCr output format is in use. I'm not sure every YCbCr > > > variant requires limited and even if it does, new formats could change > > > this. > > > > I documented what i915 is doing: > > https://elixir.bootlin.com/linux/latest/source/drivers/gpu/drm/i915/display/intel_hdmi.c#L2143 > > Sure, this is one valid strategy for the automatic behavior of YCbCr. > Drivers could also always send an InfoFrame to ensure full range where > possible. The point here is that this property shall not affect YCbCr > output formats! > > Maybe it's even better to say "driver specific" instead of "automatic". Honestly, I'm not sure what you want from me here. Ville and you insisted on the previous version to document what i915 is doing and to follow whatever the behaviour was, and that we shouldn't spend time improving the property. Fine, I did that. But now, you want me to ... improve the property? Maxime _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel