From: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
Date: Mon, 14 Aug 2017 23:49:05 +0800
Subject: EDAC, pnd2: Properly toggle hidden state for P2SB PCI device
Patch-mainline: v4.14-rc1
Git-commit: bc8f10babcc27c1f4d8e80d91cc543eabf9125c4
References: bsc#1056989

Properly handle hidden state of P2SB PCI device (DEV:D, FUN:0) for
Apollo Lake.

Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: linux-edac <linux-edac@vger.kernel.org>
Link: http://lkml.kernel.org/r/20170814154905.21707-1-qiuxu.zhuo@intel.com
Signed-off-by: Borislav Petkov <bp@suse.de>
---
 drivers/edac/pnd2_edac.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/edac/pnd2_edac.c b/drivers/edac/pnd2_edac.c
index 89cdd9a7a733..4395c84cdcbf 100644
--- a/drivers/edac/pnd2_edac.c
+++ b/drivers/edac/pnd2_edac.c
@@ -161,8 +161,12 @@ static int _apl_rd_reg(int port, int off, int op, u32 *data)
 {
 	int retries = 0xff, ret;
 	u16 status;
+	u8 hidden;
 
-	P2SB_WRITE(byte, P2SB_HIDE_OFF, 0);
+	/* Unhide the P2SB device, if it's hidden */
+	P2SB_READ(byte, P2SB_HIDE_OFF, &hidden);
+	if (hidden)
+		P2SB_WRITE(byte, P2SB_HIDE_OFF, 0);
 
 	if (p2sb_is_busy(&status)) {
 		ret = -EAGAIN;
@@ -185,7 +189,9 @@ static int _apl_rd_reg(int port, int off, int op, u32 *data)
 	P2SB_READ(dword, P2SB_DATA_OFF, data);
 	ret = (status >> 1) & 0x3;
 out:
-	P2SB_WRITE(byte, P2SB_HIDE_OFF, 1);
+	/* Hide the P2SB device, if it was hidden before */
+	if (hidden)
+		P2SB_WRITE(byte, P2SB_HIDE_OFF, hidden);
 
 	return ret;
 }