fix(gic600): workaround for Part 1 of GIC600 erratum 2384374
GIC600 erratum 2384374 is a Category B erratum. Part 1 is fixed
in this patch, and the Part 1 failure mode is described as
'If the packet to be sent is a SET packet, then a higher priority SET
may not be sent when it should be until an unblocking event occurs.'
This is handled by calling gicv3_apply_errata_wa_2384374() in the
ehf_deactivate_priority() path, so that when EHF restores the priority
to the original priority, the interrupt packet buffered
in the GIC can be sent.
gicv3_apply_errata_wa_2384374() is the workaround for
the Part 2 of erratum 2384374 which flush packets from the GIC buffer
and is being used in this patch.
SDEN can be found here:
https://developer.arm.com/documentation/sden892601/latest/
Signed-off-by: Arvind Ram Prakash <arvind.ramprakash@arm.com>
Change-Id: I4bb6dcf86c94125cbc574e0dc5119abe43e84731
diff --git a/drivers/arm/gic/v3/gicv3_main.c b/drivers/arm/gic/v3/gicv3_main.c
index 3190f66..8ea164c 100644
--- a/drivers/arm/gic/v3/gicv3_main.c
+++ b/drivers/arm/gic/v3/gicv3_main.c
@@ -1321,6 +1321,31 @@
}
/*******************************************************************************
+ * This function restores the PMR register to old value and also triggers
+ * gicv3_apply_errata_wa_2384374() that flushes the GIC buffer allowing any
+ * pending interrupts to processed. Returns the original PMR.
+ ******************************************************************************/
+unsigned int gicv3_deactivate_priority(unsigned int mask)
+{
+
+ unsigned int old_mask, proc_num;
+ uintptr_t gicr_base;
+
+ old_mask = gicv3_set_pmr(mask);
+
+ proc_num = plat_my_core_pos();
+ gicr_base = gicv3_driver_data->rdistif_base_addrs[proc_num];
+ assert(gicr_base != 0UL);
+
+ /* Add DSB to ensure visibility of System register writes */
+ dsb();
+
+ gicv3_apply_errata_wa_2384374(gicr_base);
+
+ return old_mask;
+}
+
+/*******************************************************************************
* This function delegates the responsibility of discovering the corresponding
* Redistributor frames to each CPU itself. It is a modified version of
* gicv3_rdistif_base_addrs_probe() and is executed by each CPU in the platform