npu2-opencapi: Extend delay after releasing reset on adapter

Give more time to the FPGA to process the reset signal. The previous
delay, 5ms, is too short for newer adapters with bigger FPGAs. Extend
it to 250ms.
Ultimately, that delay will likely end up being added to the opencapi
specification, but we are not there yet.

Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com>
Reviewed-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.ibm.com>

hw/npu2-opencapi.c

@@ -1198,8 +1198,8 @@ static int64_t npu2_opencapi_freset(struct pci_slot *slot)
 		deassert_adapter_reset(dev);
 		pci_slot_set_state(slot,
 				OCAPI_SLOT_FRESET_DEASSERT_DELAY2);
-		/* give 5ms to device to be ready */
-		return pci_slot_set_sm_timeout(slot, msecs_to_tb(5));
+		/* give 250ms to device to be ready */
+		return pci_slot_set_sm_timeout(slot, msecs_to_tb(250));
 
 	case OCAPI_SLOT_FRESET_DEASSERT_DELAY2:
 		if (dev->train_fenced) {