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Ignore renesas_usb_fw.mem requested by xhci-pci-renesas if fallback to ROM (#1105000)

Pascal Hambourg requested to merge pham/hw-detect:pham/ignore_renesas_usb_fw into master

This firmware file seems to be optional when a fallback firmware can be loaded from ROM, it is not packaged anyway and unloading xhci-pci-renesas when not needed disconnects USB devices attached to Renesas USB controllers (see #1105000).

Check if firmware could be loaded from ROM in kernel messages.

An alternative could be to check some indication in /sys that the driver actually works (in my experience, just being bound to a device is not reliable enough; maybe the existence of child devices). Maybe something like /sys/module/xhci-pci-renesas/drivers/*/*:*.*/usb* exists ? I do not have this hardware so cannot test it.

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