From 46caf09598575747070c599dbfd9abca9e96b831 Mon Sep 17 00:00:00 2001
From: Subrata Banik <subrata.banik@intel.com>
Date: Fri, 28 Sep 2018 19:54:30 +0530
Subject: soc/intel/skylake: Ensure FSP don't override ITSS IPCx registers

This patch save and restore ITSS IPCx register before and after
FSP-S call.

Change-Id: Ib731f27826d604c305dc52a8488fd6240b01148a
Signed-off-by: Subrata Banik <subrata.banik@intel.com>
Reviewed-on: https://review.coreboot.org/28791
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
---
 src/soc/intel/skylake/chip_fsp20.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'src/soc/intel/skylake/chip_fsp20.c')

diff --git a/src/soc/intel/skylake/chip_fsp20.c b/src/soc/intel/skylake/chip_fsp20.c
index 039d45a507..a2a430e695 100644
--- a/src/soc/intel/skylake/chip_fsp20.c
+++ b/src/soc/intel/skylake/chip_fsp20.c
@@ -29,6 +29,7 @@
 #include <fsp/api.h>
 #include <fsp/util.h>
 #include <intelblocks/chip.h>
+#include <intelblocks/itss.h>
 #include <intelblocks/xdci.h>
 #include <intelpch/lockdown.h>
 #include <romstage_handoff.h>
@@ -37,6 +38,7 @@
 #include <soc/interrupt.h>
 #include <soc/iomap.h>
 #include <soc/irq.h>
+#include <soc/itss.h>
 #include <soc/pci_devs.h>
 #include <soc/ramstage.h>
 #include <soc/systemagent.h>
@@ -167,8 +169,16 @@ static void pcie_override_devicetree_after_silicon_init(void)
 
 void soc_init_pre_device(void *chip_info)
 {
+	/* Snapshot the current GPIO IRQ polarities. FSP is setting a
+	 * default policy that doesn't honor boards' requirements. */
+	itss_snapshot_irq_polarities(GPIO_IRQ_START, GPIO_IRQ_END);
+
 	/* Perform silicon specific init. */
 	fsp_silicon_init(romstage_handoff_is_resume());
+
+	/* Restore GPIO IRQ polarities back to previous settings. */
+	itss_restore_irq_polarities(GPIO_IRQ_START, GPIO_IRQ_END);
+
 	/* swap enabled PCI ports in device tree if needed */
 	pcie_override_devicetree_after_silicon_init();
 }
-- 
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