[alsa-devel] What can change after suspend ?

Giuliano Pochini pochini at shiny.it
Wed Oct 28 00:17:50 CET 2009

I'm adding suspend/resume support to echoaudio drivers. I was
reading /Documentation/power/pci.txt:

        /* device's irq possibly is changed, driver should take care */

The card does not support D[0-3] states. The driver suspends the card by
turning the DSP off, without changing the PCI state. Can IRQ, memory mapped
regions, whatever, change on resume ?
Are pci_save_state() and pci_enable_wake() useful/required in this case ?


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