I use the imx_sim.c driver in my imx7 Linux kernel to communicate with a sim card. Until now everything worked perfectly as I expected, but after introducing a suspend command into my system, the sim driver does not behave after returning to normal mode.
I use kernel
What would typically cause the device driver to be non-functional after coming out of suspend?
I looked with oscilloscope and the SIM signals are totally dead after returning to normal mode from suspend
On resume driver should re-init all required HW. Looks like your version of imx_sim.c has it not implemented or implemented incorrectly. Could you try a 5.4 kernel? The imx_sim.c looks much more mature there.
I tried with the changes from 5.4, no luck.
My final solution was to load the driver as a module and then to remove and reload the module after suspend
Hi @eoin_oc1 !
Could you please share more information about your setup?
- Which Colibri iMX7 version are you using?
- Which carrier board (Toradex’s or custom) are you using? If Toradex’s, which version?