[Skiboot] [PATCH] capi: Disable CAPP virtual machines

[Vaibhav Jain]

When exercising more than one CAPI accelerators simultaneously in
cache coherency mode, the verification team is seeing a deadlock. To
fix this a workaround of disabling CAPP virtual machines is
suggested. So this patch updates CAPP APC Master Powerbus control
register during CAPP init to also set Bit(12) that disables CAPP
virtual machines.

Signed-off-by: Vaibhav Jain <vaibhav at linux.vnet.ibm.com>
---
 hw/phb4.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/phb4.c b/hw/phb4.c
index ff912e1f..8e660b66 100644
--- a/hw/phb4.c
+++ b/hw/phb4.c
@@ -3581,6 +3581,7 @@ static void phb4_init_capp_regs(struct phb4 *p, uint32_t capp_eng)
 	xscom_read(p->chip_id, APC_MASTER_PB_CTRL + offset, &reg);
 	reg |= PPC_BIT(0); /* enable cResp exam */
 	reg |= PPC_BIT(3); /* disable vg not sys */
+	reg |= PPC_BIT(12);/* HW417025: disable capp virtual machines */
 	if (p->rev == PHB4_REV_NIMBUS_DD10) {
 		reg |= PPC_BIT(1);
 	} else {
-- 
2.14.3