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I > saw you already had to bother with other breakages of existing > boards/platforms in the previous implementation. Unfortunately it looks > like this still causes some kind of regression in my case. > > I'm working with an i.MX8MM board (kontron-sl-mx8mm_defconfig) and I see > a crash as soon as I do "usb start" and then "usb stop" (log for the > latter see below). > > As soon as I revert this patch everything starts to work fine again. Do > you have any suggestions? The power-domains involved here are pgc_otg1 > and pgc_hsiomix defined in imx8mm.dtsi. > > Thanks > Frieder > > > => usb stop > stopping USB.. > Sending event 6/(unknown) to spy 'efi_disk del' > Sending event 6/(unknown) to spy 'efi_disk del' > Looking for power-domain@0 > Looking for power-domain@0 > - checking gpc@303a0000 > - checking power-domain@0 > - result for power-domain@0: power-domain@0 (ret=0) > - result for power-domain@0: power-domain@0 (ret=0) > "Synchronous Abort" handler, esr 0x96000005, far 0x4ebacdc50 > elr: 0000000040249c94 lr : 0000000040249c6c (reloc) > elr: 00000000fff4ec94 lr : 00000000fff4ec6c > x0 : 0000000000000001 x1 : 00000000fbf22750 > x2 : 00000003efbab500 x3 : 00000000fffcdfb0 > x4 : 0000000000000020 x5 : 0000000000000020 > x6 : 00000000fbeea10f x7 : 00000000fbeea3d7 > x8 : 00000000fffffffe x9 : 00000000fbeea1ec > x10: 00000000fbeea280 x11: 00000000ffffffd8 > x12: 00000000fbeeb1b0 x13: 00000000fbeeb1b0 > x14: 0000000000000002 x15: 0000000000000000 > x16: 00000000fff4edc4 x17: 0000000000000000 > x18: 00000000fbef4db0 x19: 00000004ebacdc50 > x20: 00000000fbeeace8 x21: 00000000fbf21ad0 > x22: 0000000000000000 x23: 0000000000000001 > x24: 0000000000000000 x25: 00000000fbf28f10 > x26: 0000000000000000 x27: 00000000fbf2ad40 > x28: 00000000fbf2ada0 x29: 00000000fbeeac70 > > Code: f9400693 d37ef662 ab130833 54000140 (b8626820) > Resetting CPU ... > > FWIW, here is another log with only the debug output from power-domain-uclass.c: => usb start starting USB... power_domain_get_by_index(dev=00000000fbefacd0, power_domain=00000000fbeead28) power_domain_get_by_index(dev=00000000fbef7450, power_domain=00000000fbef74f0) power_domain_get_by_index: dev_read_phandle_with_args failed: -2 power_domain_get_by_index(dev=00000000fbef7560, power_domain=00000000fbef7600) power_domain_get_by_index: dev_read_phandle_with_args failed: -2 Enable power domain power-domain@0.0: 0 -> 1 (todo) power_domain_get_by_index(dev=00000000fbef58b0, power_domain=00000000fbeeabf8) power_domain_get_by_index(dev=00000000fbef7780, power_domain=00000000fbef7820) power_domain_get_by_index: dev_read_phandle_with_args failed: -2 Enable power domain power-domain@2.0: 0 -> 1 (todo) power_domain_get_by_index(dev=00000000fbf239d0, power_domain=00000000fbeea288) Enable power domain power-domain@0.0: 1 -> 2 (EALREADY) Bus usb@32e40000: 1 USB Device(s) found => => usb stop stopping USB.. power_domain_get_by_index(dev=00000000fbf239d0, power_domain=00000000fbeeac88) "Synchronous Abort" handler, esr 0x96000005, far 0x4ebaceb90