IB/ipath: enable GPIO interrupt on HT-460

This is required for even semi-decent performance on OpenIB.

Signed-off-by: Bryan O'Sullivan <[e-mail]>
Signed-off-by: Roland Dreier <[e-mail]>

drivers/infiniband/hw/ipath/ipath_eeprom.c

···
  * ipath_get_guid - get the GUID from the i2c device
  * @dd: the infinipath device
  *
- * When we add the multi-chip support, we will probably have to add
- * the ability to use the number of guids field, and get the guid from
- * the first chip's flash, to use for all of them.
+ * We have the capability to use the ipath_nguid field, and get
+ * the guid from the first chip's flash, to use for all of them.
  */
-void ipath_get_guid(struct ipath_devdata *dd)
+void ipath_get_eeprom_info(struct ipath_devdata *dd)
 {
 	void *buf;
 	struct ipath_flash *ifp;

drivers/infiniband/hw/ipath/ipath_ht400.c

···
 	case 4:		/* Ponderosa is one of the bringup boards */
 		n = "Ponderosa";
 		break;
-	case 5:		/* HT-460 original production board */
+	case 5:
+		/*
+		 * HT-460 original production board; two production levels, with
+		 * different serial number ranges.   See ipath_ht_early_init() for
+		 * case where we enable IPATH_GPIO_INTR for later serial # range.
+		 */
 		n = "InfiniPath_HT-460";
 		break;
 	case 6:
···
 	if (n)
 		snprintf(name, namelen, "%s", n);
 
-	if (dd->ipath_majrev != 3 || dd->ipath_minrev != 2) {
+	if (dd->ipath_majrev != 3 || (dd->ipath_minrev < 2 || dd->ipath_minrev > 3)) {
 		/*
 		 * This version of the driver only supports the HT-400
 		 * Rev 3.2
···
 	 */
 	ipath_write_kreg(dd, dd->ipath_kregs->kr_sendctrl,
 			 INFINIPATH_S_ABORT);
+
+	ipath_get_eeprom_info(dd);
+	if(dd->ipath_boardrev == 5 && dd->ipath_serial[0] == '1' &&
+		dd->ipath_serial[1] == '2' && dd->ipath_serial[2] == '8') {
+		/*
+		 * Later production HT-460 has same changes as HT-465, so
+		 * can use GPIO interrupts.  They have serial #'s starting
+		 * with 128, rather than 112.
+		 */
+		dd->ipath_flags |= IPATH_GPIO_INTR;
+		dd->ipath_flags &= ~IPATH_POLL_RX_INTR;
+	}
 	return 0;
 }
 

drivers/infiniband/hw/ipath/ipath_init_chip.c

···
 
 done:
 	if (!ret) {
-		ipath_get_guid(dd);
 		*dd->ipath_statusp |= IPATH_STATUS_CHIP_PRESENT;
 		if (!dd->ipath_f_intrsetup(dd)) {
 			/* now we can enable all interrupts from the chip */

drivers/infiniband/hw/ipath/ipath_kernel.h

···
 void ipath_init_pe800_funcs(struct ipath_devdata *);
 /* init HT-400-specific func */
 void ipath_init_ht400_funcs(struct ipath_devdata *);
-void ipath_get_guid(struct ipath_devdata *);
+void ipath_get_eeprom_info(struct ipath_devdata *);
 u64 ipath_snap_cntr(struct ipath_devdata *, ipath_creg);
 
 /*

drivers/infiniband/hw/ipath/ipath_pe800.c

···
 	 */
 	dd->ipath_rhdrhead_intr_off = 1ULL<<32;
 
+	ipath_get_eeprom_info(dd);
+
 	return 0;
 }