[PATCH 1/2][SRU][C] r8169: Enable MSI-X on RTL8106e

AceLan Kao acelan.kao at canonical.com
Thu Dec 27 03:17:03 UTC 2018

From: Jian-Hong Pan <jian-hong at endlessm.com>

BugLink: https://bugs.launchpad.net/bugs/1809847

Originally, we have an issue where r8169 MSI-X interrupt is broken after
S3 suspend/resume on RTL8106e of ASUS X441UAR.

02:00.0 Ethernet controller [0200]: Realtek Semiconductor Co., Ltd.
RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller [10ec:8136]
(rev 07)
	Subsystem: ASUSTeK Computer Inc. RTL810xE PCI Express Fast
Ethernet controller [1043:200f]
	Flags: bus master, fast devsel, latency 0, IRQ 16
	I/O ports at e000 [size=256]
	Memory at ef100000 (64-bit, non-prefetchable) [size=4K]
	Memory at e0000000 (64-bit, prefetchable) [size=16K]
	Capabilities: [40] Power Management version 3
	Capabilities: [50] MSI: Enable- Count=1/1 Maskable- 64bit+
	Capabilities: [70] Express Endpoint, MSI 01
	Capabilities: [b0] MSI-X: Enable+ Count=4 Masked-
	Capabilities: [d0] Vital Product Data
	Capabilities: [100] Advanced Error Reporting
	Capabilities: [140] Virtual Channel
	Capabilities: [160] Device Serial Number 01-00-00-00-36-4c-e0-00
	Capabilities: [170] Latency Tolerance Reporting
	Kernel driver in use: r8169
	Kernel modules: r8169

We found the all of the values in PCI BAR=4 of the ethernet adapter
become 0xFF after system resumes.  That breaks the MSI-X interrupt.
Therefore, we can only fall back to MSI interrupt to fix the issue at
that time.

However, there is a commit which resolves the drivers getting nothing in
PCI BAR=4 after system resumes.  It is 04cb3ae895d7 "PCI: Reprogram
bridge prefetch registers on resume" by Daniel Drake.

After apply the patch, the ethernet adapter works fine before suspend
and after resume.  So, we can revert the workaround after the commit
"PCI: Reprogram bridge prefetch registers on resume" is merged into main

This patch reverts commit 7bb05b85bc2d1a1b647b91424b2ed4a18e6ecd81
"r8169: don't use MSI-X on RTL8106e".

Buglink: https://bugzilla.kernel.org/show_bug.cgi?id=201181
Fixes: 7bb05b85bc2d ("r8169: don't use MSI-X on RTL8106e")
Signed-off-by: Jian-Hong Pan <jian-hong at endlessm.com>
Signed-off-by: David S. Miller <davem at davemloft.net>
(cherry picked from commit d49c88d7677ba737e9d2759a87db0402d5ab2607)
Signed-off-by: AceLan Kao <acelan.kao at canonical.com>
 drivers/net/ethernet/realtek/r8169.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index f18087102d40..7e816fe9bc41 100644
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -7539,20 +7539,17 @@ static int rtl_alloc_irq(struct rtl8169_private *tp)
 	unsigned int flags;
-	switch (tp->mac_version) {
+	if (tp->mac_version <= RTL_GIGA_MAC_VER_06) {
 		RTL_W8(tp, Cfg9346, Cfg9346_Unlock);
 		RTL_W8(tp, Config2, RTL_R8(tp, Config2) & ~MSIEnable);
 		RTL_W8(tp, Cfg9346, Cfg9346_Lock);
 		flags = PCI_IRQ_LEGACY;
-		break;
+	} else if (tp->mac_version == RTL_GIGA_MAC_VER_40) {
 		/* This version was reported to have issues with resume
 		 * from suspend when using MSI-X
-		break;
-	default:
+	} else {
 		flags = PCI_IRQ_ALL_TYPES;

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