[PATCH] GPU: ipu: fix lockup caused by pending chained interrupts

[Russell King - ARM Linux]

Even with the oops fixed by a previous patch, the system still fails to
kexec, due to a stuck chained interrupt locking the system.  We must
disable the child interrupts prior to setting up the irq chip to ensure
we don't get stuck here.

Signed-off-by: Russell King <rmk+kernel at arm.linux.org.uk>
---
Maybe this is all that's really needed... would also be nice if this
path had an etry in MAINTAINERS...

Having discussed with Thomas today, we've decided that (maybe) David
should take this patch.  It's rather unclear who to send these patches
to though.

 drivers/gpu/ipu-v3/ipu-common.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/ipu-v3/ipu-common.c b/drivers/gpu/ipu-v3/ipu-common.c
index 6d2f39d36e44..00f2058944e5 100644
--- a/drivers/gpu/ipu-v3/ipu-common.c
+++ b/drivers/gpu/ipu-v3/ipu-common.c
@@ -1107,6 +1107,9 @@ static int ipu_irq_init(struct ipu_soc *ipu)
 		return ret;
 	}
 
+	for (i = 0; i < IPU_NUM_IRQS; i += 32)
+		ipu_cm_write(ipu, 0, IPU_INT_CTRL(i / 32));
+
 	for (i = 0; i < IPU_NUM_IRQS; i += 32) {
 		gc = irq_get_domain_generic_chip(ipu->domain, i);
 		gc->reg_base = ipu->cm_reg;
-- 
2.1.0