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Commit aeb30016 authored by Dexuan Cui's avatar Dexuan Cui Committed by Jesse Barnes
Browse files

PCI: add Intel USB specific reset method 



Handle device specific reset requirements (i.e. vendor reg for reset
along with appropriate timeout).

Signed-off-by: default avatarYu Zhao <yu.zhao@intel.com>
Signed-off-by: default avatarDexuan Cui <dexuan.cui@intel.com>
Signed-off-by: default avatarJesse Barnes <jbarnes@virtuousgeek.org>
parent b9c3b266

drivers/pci/quirks.c

+24 −0
Original line number Diff line number Diff line
@@ -2642,7 +2642,31 @@ fs_initcall_sync(pci_apply_final_quirks); 
 * reset a single function if other methods (e.g. FLR, PM D0->D3) are

 * not available.

 */

static int reset_intel_generic_dev(struct pci_dev *dev, int probe)

{

	int pos;



	/* only implement PCI_CLASS_SERIAL_USB at present */

	if (dev->class == PCI_CLASS_SERIAL_USB) {

		pos = pci_find_capability(dev, PCI_CAP_ID_VNDR);

		if (!pos)

			return -ENOTTY;



		if (probe)

			return 0;



		pci_write_config_byte(dev, pos + 0x4, 1);

		msleep(100);



		return 0;

	} else {

		return -ENOTTY;

	}

}



struct pci_dev_reset_methods pci_dev_reset_methods[] = {

	{ PCI_VENDOR_ID_INTEL, PCI_ANY_ID,

		reset_intel_generic_dev },

	{ 0 }

};

#else