Hi,
I’m pretty new to DRM/DRI and wonder if there is a way to have a stable
identification of connectors across changes in the Linux kernel and/or in the
devicetree?
Our hardware contains an iMX8QM with two displays, each one connected to a
MIPI-DSI channel. We use kernel 6.1.38.
In the output of “modetest -c” the connectors are called LVDS-1 and LVDS-2.
These names are built in modetest.c from connector_type and connector_type_id.
connector_type_id is set in the kernel in drivers/gpu/drm/drm_connector.c in
__drm_connector_init():
connector<https://elixir.bootlin.com/linux/latest/C/ident/connector>->connector_type_id<https://elixir.bootlin.com/linux/latest/C/ident/connector_type_id>
=
ida_alloc_min<https://elixir.bootlin.com/linux/latest/C/ident/ida_alloc_min>(connector_ida<https://elixir.bootlin.com/linux/latest/C/ident/connector_ida>,
1, GFP_KERNEL<https://elixir.bootlin.com/linux/latest/C/ident/GFP_KERNEL>);
Seems to me that this number depends on initialization order only. Is there any
other way to identify a connector?
If not, will the type_id be stable as long as we don’t change the kernel
version and the device tree?
Best Regards,
Joerg Albert
+491747384960
We move the world for the better through technology and engineering.
www.iav.com<https://www.iav.com> | Facebook<https://www.facebook.com/insideiav>
| Instagram<https://www.instagram.com/inside_iav/> |
LinkedIn<https://www.linkedin.com/company/iav-gmbh> |
Xing<https://www.xing.com/companies/iav> |
YouTube<https://www.youtube.com/user/IAVchannel>
IAV GmbH Ingenieurgesellschaft Auto und Verkehr; Sitz/Registered Office:
Berlin; Registergericht/Registration Court: Amtsgericht Charlottenburg
(Berlin); Registernummer/Company Registration Number: HRB 21 280 B;
Geschäftsführer/Managing Directors: Joerg Astalosch, Martin Mahlke, Dr. Uwe
Horn; Vorsitzender des Aufsichtsrates/Chairman of the Supervisory Board: Dr.
Nikolai Ardey
Datenschutzhinweise/Privacy Policy<https://www.iav.com/datenschutz>
