Commit-ID: 66569052fe5328729ff696c1ec17913907d00b5f
Gitweb: https://git.kernel.org/tip/66569052fe5328729ff696c1ec17913907d00b5f
Author: Marc Zyngier <marc.zyngier@xxxxxxx>
AuthorDate: Tue, 20 Mar 2018 18:21:37 +0000
Committer: Marc Zyngier <marc.zyngier@xxxxxxx>
CommitDate: Tue, 20 Mar 2018 19:12:15 +0000
irqchip/gic-v3: Don't try to reset AP0Rn
Clearing AP0Rn has created a number of regressions, due to systems
that have SCR_EL3.FIQ set. Even when addressing some obvious bugs,
GIC500 platforms seem to act bizarrely (we are supposed to have
5 bits of priority, but PMR seems to behave as if we had 6...).
Drop the AP0Rn reset for the time being, it is unlikely to have any
effect if kexec-ing.
Fixes: d6062a6d62c6 irqchip/gic-v3: Reset APgRn registers at boot time
Reported-by: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>
Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx>
---
drivers/irqchip/irq-gic-v3.c | 4 ----
1 file changed, 4 deletions(-)
diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c
index 0d8e326ebf19..e2b90bec1473 100644
--- a/drivers/irqchip/irq-gic-v3.c
+++ b/drivers/irqchip/irq-gic-v3.c
@@ -570,16 +570,12 @@ static void gic_cpu_sys_reg_init(void)
switch(val + 1) {
case 8:
case 7:
- write_gicreg(0, ICC_AP0R3_EL1);
write_gicreg(0, ICC_AP1R3_EL1);
- write_gicreg(0, ICC_AP0R2_EL1);
write_gicreg(0, ICC_AP1R2_EL1);
case 6:
- write_gicreg(0, ICC_AP0R1_EL1);
write_gicreg(0, ICC_AP1R1_EL1);
case 5:
case 4:
- write_gicreg(0, ICC_AP0R0_EL1);
write_gicreg(0, ICC_AP1R0_EL1);
}
--
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