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[35.200.101.178]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-2c4a7602690sm11894540a91.28.2024.06.17.17.04.56 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 17 Jun 2024 17:04:56 -0700 (PDT) Received: from martinet by pc-0182.atmarktech with local (Exim 4.96) (envelope-from ) id 1sJMLG-00ACZX-1h; Tue, 18 Jun 2024 09:04:54 +0900 Date: Tue, 18 Jun 2024 09:04:44 +0900 From: Dominique MARTINET To: Adam Ford , Lucas Stach Cc: linux-arm-kernel@lists.infradead.org, marex@denx.de, Laurent Pinchart , Andrzej Hajda , Neil Armstrong , Robert Foss , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Daniel Vetter , Shawn Guo , Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , NXP Linux Team , Vinod Koul , Kishon Vijay Abraham I , Liu Ying , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-phy@lists.infradead.org, Makoto Sato Subject: Re: drm/bridge/imx8mp-hdmi-tx: Allow inexact pixel clock frequencies (Was: [PATCH V8 10/12] drm/bridge: imx: add bridge wrapper driver for i.MX8MP DWC HDMI) Message-ID: References: <22a3f5266260dd3915269ae3eec7724f7537eb55.camel@pengutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Dominique MARTINET wrote on Tue, Jun 18, 2024 at 08:45:38AM +0900: > I'm thinking the last few values just affect a very small % of the > values, but would need to check with a proper scope if I can get a hold > of the clock line... > Does any of you happen to have any datasheet for these registers, > or should we consider them to be magic values? Answering to myself on this point, the registers are properly described in the iMX8MP reference manual... I don't make much sense of it at this point (what's SDC..?), but I guess it does sound likely we could generate the values with some work. I'll wait for replies a bit first in case one of you understands this better than I (which is quite likely!), but can give this a few more hours to help. -- Dominique