PCI/VC: Use FIELD_GET()

Use FIELD_GET() to remove dependences on the field position, i.e., the
shift value. No functional change intended.

Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Bjorn Helgaas <[e-mail]>
Reviewed-by: Ilpo Järvinen <[e-mail]>
Reviewed-by: Jonathan Cameron <[e-mail]>
Reviewed-by: Kuppuswamy Sathyanarayanan <[e-mail]>

drivers/pci/vc.c

···
  *     Author: Alex Williamson <[e-mail]>
  */
 
+#include <linux/bitfield.h>
 #include <linux/device.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
···
 	/* Extended VC Count (not counting VC0) */
 	evcc = cap1 & PCI_VC_CAP1_EVCC;
 	/* Low Priority Extended VC Count (not counting VC0) */
-	lpevcc = (cap1 & PCI_VC_CAP1_LPEVCC) >> 4;
+	lpevcc = FIELD_GET(PCI_VC_CAP1_LPEVCC, cap1);
 	/* Port Arbitration Table Entry Size (bits) */
-	parb_size = 1 << ((cap1 & PCI_VC_CAP1_ARB_SIZE) >> 10);
+	parb_size = 1 << FIELD_GET(PCI_VC_CAP1_ARB_SIZE, cap1);
 
 	/*
 	 * Port VC Control Register contains VC Arbitration Select, which
···
 		int vcarb_offset;
 
 		pci_read_config_dword(dev, pos + PCI_VC_PORT_CAP2, &cap2);
-		vcarb_offset = ((cap2 & PCI_VC_CAP2_ARB_OFF) >> 24) * 16;
+		vcarb_offset = FIELD_GET(PCI_VC_CAP2_ARB_OFF, cap2) * 16;
 
 		if (vcarb_offset) {
 			int size, vcarb_phases = 0;
···
 
 		pci_read_config_dword(dev, pos + PCI_VC_RES_CAP +
 				      (i * PCI_CAP_VC_PER_VC_SIZEOF), &cap);
-		parb_offset = ((cap & PCI_VC_RES_CAP_ARB_OFF) >> 24) * 16;
+		parb_offset = FIELD_GET(PCI_VC_RES_CAP_ARB_OFF, cap) * 16;
 		if (parb_offset) {
 			int size, parb_phases = 0;