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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 17.02.23 19:22, Rasmus Villemoes wrote: > On 07/02/2023 10.09, Rasmus Villemoes wrote: > >> I managed to get the whole chain lcdif -> mipi -> bridge -> dp-connector >> to probe with these settings >> > [...] >> Now hotplug-detect doesn't work with the current sn65dsi86 driver, but >> that's a separate issue; when I boot with a monitor attached, its edid >> is correctly read out. But I still don't get any output, and the monitor >> says "no signal" - my naive attempt (which has worked fine in other >> cases) was to just dd /dev/urandom to /dev/fb0, so I'm clearly missing >> some important step. > > No idea if it's important, but in the NXP kernel, there's a > > display-subsystem { > compatible = "fsl,imx-display-subsystem"; > ports = <&lcdif1_disp>, > <&lcdif2_disp>, > <&lcdif3_disp>; > }; > > node in imx8mp.dtsi, and when commenting out that node, the graphics > ceases to work, even if all the devices in the lcdif->mipi->bridge chain > actually probes. However, adding a corresponding node in mainline, which > does have a driver for that "fsl,imx-display-subsystem", makes no > difference; with or without that, I do get a /dev/fb0 device and the > whole chain probes, but again the monitor says no signal. The NXP kernel is completely different. AFAIK it uses the component helpers to bundle all subdrivers from a central driver (display-subsystem). This is not how the mainline approach using the bridge driver interface works. So you can't compare them. Did you look at this extensive thread with findings from Adam? https://lore.kernel.org/lkml/CAHCN7xJ=N1vWVTBjArskJ59fyaLzmAGWfc0E=_iGizrDNR_Udw@mail.gmail.com/ It is related to HDMI, but I guess a lot of things are valid for DP, too. Anyway, we need to get this series merged. Otherwise we can't work on fixing all the other issues on top. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel