astbmc: Don't do P8 PSI or DT fixups on P9

We do some P8 specific hacks on BMC platforms to work around Hostboot
not initialising the PSI BAR and to fix some problems in the hostboot
provided device tree. These shouldn't be done on P9.

Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

platforms/astbmc/common.c

@@ -321,11 +321,17 @@ static void astbmc_fixup_psi_bar(void)
 
 void astbmc_early_init(void)
 {
-	/* Hostboot's device-tree isn't quite right yet */
-	astbmc_fixup_dt();
+	/*
+	 * On P9 we don't have a HB supplied devicetree and we have a
+	 * different PSI BAR hack here is P8 specific.
+	 */
+	if (proc_gen == proc_gen_p8) {
+		/* Hostboot's device-tree isn't quite right yet */
+		astbmc_fixup_dt();
 
-	/* Hostboot forgets to populate the PSI BAR */
-	astbmc_fixup_psi_bar();
+		/* Hostboot forgets to populate the PSI BAR */
+		astbmc_fixup_psi_bar();
+	}
 
 	/* Send external interrupts to me */
 	psi_set_external_irq_policy(EXTERNAL_IRQ_POLICY_SKIBOOT);