linux-kernel - Re: imx8mm lcdif->dsi->adv7535 no video, no errors

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Date:   Mon, 1 Aug 2022 21:29:40 -0500
From:   Adam Ford <aford173@...il.com>
To:     Fabio Estevam <festevam@...il.com>
Cc:     Marco Felsch <m.felsch@...gutronix.de>,
        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

On Mon, Aug 1, 2022 at 8:53 PM Fabio Estevam <festevam@...il.com> wrote:
>
> On Mon, Aug 1, 2022 at 10:39 PM Adam Ford <aford173@...il.com> wrote:
>
> > I managed to get my HDMI output working. I had the lanes set to 2
> > instead of 4.  Once I switched to 4-lanes, the monitor came up in
> > 1080p.  I haven't yet been able to get other modes to work.
>
> Ok, good. On another thread, you mentioned that you were also trying
> to get LVDS to work via SN65DSI83.
>
> Does LVDS work for you on this branch?

I haven't tried with Marek's latest suggestion.  In the other thread
he mentioned a burst mode and setting the DSI speeds to higher
frequencies, but the patch he had didn't look like it would apply
cleanly, so I will need to dig into that a bit further.  Since my
company doesn't really ship the LVDS displays with the kits, the HDMI
is the default video, so I've been focusing on it.

To answer Marco's question, I was able to revert "MLK-21958-13:
drm/bridge: adv7511: Limit supported clocks" and still get a display
at 1080p, but all the other resolutions I tried appear to come up
blank.  I didn't try every one.  With that revert, more options come
available, but 1440x900 and 800x600 were options I tried
unsuccessfullyl.

adam