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Subject[PATCH v2 net] r8169: don't use MSI-X on RTL8106e
Date
Found the ethernet network on ASUS X441UAR doesn't come back on resume
from suspend when using MSI-X. The chip is RTL8106e - version 39.

[ 21.848357] libphy: r8169: probed
[ 21.848473] r8169 0000:02:00.0 eth0: RTL8106e, 0c:9d:92:32:67:b4, XID
44900000, IRQ 127
[ 22.518860] r8169 0000:02:00.0 enp2s0: renamed from eth0
[ 29.458041] Generic PHY r8169-200:00: attached PHY driver [Generic
PHY] (mii_bus:phy_addr=r8169-200:00, irq=IGNORE)
[ 63.227398] r8169 0000:02:00.0 enp2s0: Link is Up - 100Mbps/Full -
flow control off
[ 124.514648] Generic PHY r8169-200:00: attached PHY driver [Generic
PHY] (mii_bus:phy_addr=r8169-200:00, irq=IGNORE)

Here is the ethernet controller in detail:

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: <access denied>
Kernel driver in use: r8169
Kernel modules: r8169

Falling back to MSI fixes the issue.

Fixes: 6c6aa15fdea5 ("r8169: improve interrupt handling")
Signed-off-by: Jian-Hong Pan <jian-hong@endlessm.com>
---
Changes in v2:
- Make the commit message shorter
- Add "Fixes" tag in the commit message

drivers/net/ethernet/realtek/r8169.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/net/ethernet/realtek/r8169.c b/drivers/net/ethernet/realtek/r8169.c
index 0d9c3831838f..0efa977c422d 100644
--- a/drivers/net/ethernet/realtek/r8169.c
+++ b/drivers/net/ethernet/realtek/r8169.c
@@ -7071,17 +7071,20 @@ static int rtl_alloc_irq(struct rtl8169_private *tp)
{
unsigned int flags;

- if (tp->mac_version <= RTL_GIGA_MAC_VER_06) {
+ switch (tp->mac_version) {
+ case RTL_GIGA_MAC_VER_01 ... 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;
- } else if (tp->mac_version == RTL_GIGA_MAC_VER_40) {
+ break;
+ case RTL_GIGA_MAC_VER_39 ... RTL_GIGA_MAC_VER_40:
/* This version was reported to have issues with resume
* from suspend when using MSI-X
*/
flags = PCI_IRQ_LEGACY | PCI_IRQ_MSI;
- } else {
+ break;
+ default:
flags = PCI_IRQ_ALL_TYPES;
}

--
2.11.0
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