Messages in this thread | | | Date | Wed, 3 Aug 2022 07:56:02 +0200 | From | Marco Felsch <> | Subject | Re: imx8mm lcdif->dsi->adv7535 no video, no errors |
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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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