#armlinux on 2023-11-16 — irc logs at libera.irclog.whitequark.org

2021-05-27 16:22 ChanServ changed the topic of #armlinux to: ARM kernel talk [Upstream kernel, find your vendor forums for questions about their kernels] | https://libera.irclog.whitequark.org/armlinux

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10:33 <wens> is there a subsystem or framework that could be used to represent shared memory (in a bunch of scratch registers)? I have some mailbox hardware that also has scratch registers that could be used to pass data. Or I could just present them as extra "dumb" mailboxes that need to be polled.

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10:39 <javierm> wens: maybe regmap-mmio ?

10:40 <javierm> wens: and model it as a MFD with sub-devices ?

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13:05 <wens> javierm: the dummy registers are interspersed with the normal mailbox control registers

13:05 <javierm> wens: ah, I see

13:06 <wens> they are even labeled "channel X dummy registers"

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14:43 <j`ey> javierm: thanks for looking into that efi/simpledrm thing!

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14:45 <javierm> j`ey: you are welcome! Is still not clear what will be the final solution though

14:46 <j`ey> javierm: the platform that andrew (and I saw it on) has a proper DRM driver anyway, so for me it's just that annoying simpledrm error message :)

14:48 <javierm> j`ey: yeah I know :) but still would be good to get it fixed in case you need to boot with "nomodeset" to troubleshoot or smt

14:50 <j`ey> javierm: simpledrm is allowed even with nomodeset?

14:50 <javierm> j`ey: yes

14:51 <j`ey> ok

14:51 <javierm> j`ey: https://elixir.bootlin.com/linux/latest/source/Documentation/admin-guide/kernel-parameters.txt#L3828

14:52 <j`ey> javierm: I was looking in the code and it's not obvious

14:53 <javierm> j`ey: yeah, the "nomodeset" param semantics changed over the years... but you should look at drm_firmware_drivers_only()

14:55 <javierm> "nomodeset" is a terrible name but unfortunately there are too many articles in the web and documentation so it can't be changed anymore

14:56 * geertu never used nomodeset

14:57 <javierm> geertu: in Fedora for example the installer adds a "safe graphics mode" or something like boot entry that and it sets cmdline to "nomodeset"

14:57 <javierm> I believe other distros do the same

15:00 <javierm> geertu: and IIRC nomodeset started as a way to indicate that vgacon should force to text mode

15:08 <broonie> We could always add an alias for nomodeset if we want a better name.

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16:35 <javierm> broonie: yeah

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17:30 <bjdooks> woo, found a minor bug in qemu's gicv3 priority masking

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17:38 <deathcamel57> I'm having issues with getting a console on a SoC port I'm working on. The SoC implements a PL011 serial device. `SERIAL_AMBA_PL011` is enabled, and I have these DTS parts: https://gist.github.com/DeathCamel58/9cc456d7605fa6f8e7d3f17956f322a5

17:39 <deathcamel57> However, during boot, I'm not getting a message along the lines of "uart:0: ttyAMA0 at MMIO 0x20080000 (irq = 40) is a PL011 rev2". How can I go about debugging this?

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17:41 <deathcamel57> I added some `pr_info`s, and `amba_driver_register` is called, but the `pl011_probe` function isn't called for some reason.

17:41 <bjdooks> you might be able to use device-core debug to show it probing stuff, or maybe add some of your own debug to see if it even /tries/ to get the pl011 probe done

17:44 <bjdooks> could be device-tree or acpi issue, which are you using?

17:44 <deathcamel57> I'm using the device tree

17:45 <bjdooks> ok, maybe you have an issue with dependent resources, or your pl001 is not enabled or has a typo?

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23:23 <robmur01> deathcamel57: Linux doesn't probe disabled DT nodes ;)

23:24 <robmur01> oh wait, no, you are overriding that, silly me :(

23:28 <robmur01> next guess is the AMBA probe is probably failing to find the ID registers at the end of that 64KB region since PL011's register file is only 4KB

23:33 <robmur01> It can be confusing since SoC documentation often describes things in terms of how much space is reserved for each device in the memory map, but DT "reg" should represent what the device actually decodes

23:41 <broonie> Also worth checking that the clock driver being referenced instantiates and registers the clock the UART is trying to use.

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