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Date: Wed, 3 Aug 2022 07:56:02 +0200 From: Marco Felsch <m.felsch@...gutronix.de> To: Adam Ford <aford173@...il.com> Cc: Fabio Estevam <festevam@...il.com>, Marek Vasut <marex@...x.de>, Stefan Agner <stefan@...er.ch>, Jernej Skrabec <jernej.skrabec@...il.com>, Daniel Vetter <daniel@...ll.ch>, Jonas Karlman <jonas@...boo.se>, David Airlie <airlied@...ux.ie>, dri-devel <dri-devel@...ts.freedesktop.org>, Neil Armstrong <narmstrong@...libre.com>, NXP Linux Team <linux-imx@....com>, Robert Foss <robert.foss@...aro.org>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org>, Pengutronix Kernel Team <kernel@...gutronix.de>, Laurent Pinchart <Laurent.pinchart@...asonboard.com>, Andrzej Hajda <andrzej.hajda@...el.com>, Marek Szyprowski <m.szyprowski@...sung.com>, Shawn Guo <shawnguo@...nel.org>, Sascha Hauer <s.hauer@...gutronix.de>, arm-soc <linux-arm-kernel@...ts.infradead.org>, Jagan Teki <jagan@...rulasolutions.com>, robert.chiras@....com, laurentiu.palcu@....com Subject: Re: imx8mm lcdif->dsi->adv7535 no video, no errors Hi Adam, sorry for the delay. On 22-08-02, Adam Ford wrote: ... > > > I think that the most important one is the blanking calc. Can you try to > > > revert "drm/bridge: adv7511: Repair bus_flags and bus_format" and check > > > if you can get a output still? Also something to try would be to disable > > > the internal timing generator by specifying > > > 'adi,disable-timing-generator'. Also if you have an oscilloscope for > > I did some reading about the internal timing generator. It appears > that it's required when video formats use fractional bytes, and it's > preconfigured to run at 720p by default, but registers 28h through 37h > configure it for other video modes. I thought this timing generator can detect the sync timing automatically. Also I saw some mail discussions where this timing generator can trigger missbehaviours. Since we send the sync packages from the dsi-host to the ADV, I think it should be possible for the ADV to reconstruct the sync signals without the need of the internal timing generator. > Are you thinking the imx8mm DSI generator would do it better? You mean the porches we are sending? Regards, Marco
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