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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Kevin Brace <kevinbrace@bracecomputerlab.com>,
	"David S . Miller" <davem@davemloft.net>,
	Sasha Levin <sashal@kernel.org>,
	netdev@vger.kernel.org
Subject: [PATCH AUTOSEL 5.4 09/15] via-rhine: Fix for the hardware having a reset failure after resume
Date: Mon, 12 Oct 2020 15:03:06 -0400	[thread overview]
Message-ID: <20201012190313.3279397-9-sashal@kernel.org> (raw)
In-Reply-To: <20201012190313.3279397-1-sashal@kernel.org>

From: Kevin Brace <kevinbrace@bracecomputerlab.com>

[ Upstream commit d120c9a81e32c43cba8017dec873b6a414898716 ]

In rhine_resume() and rhine_suspend(), the code calls netif_running()
to see if the network interface is down or not.  If it is down (i.e.,
netif_running() returning false), they will skip any housekeeping work
within the function relating to the hardware.  This becomes a problem
when the hardware resumes from a standby since it is counting on
rhine_resume() to map its MMIO and power up rest of the hardware.
Not getting its MMIO remapped and rest of the hardware powered
up lead to a soft reset failure and hardware disappearance.  The
solution is to map its MMIO and power up rest of the hardware inside
rhine_open() before soft reset is to be performed.  This solution was
verified on ASUS P5V800-VM mainboard's integrated Rhine-II Ethernet
MAC inside VIA Technologies VT8251 South Bridge.

Signed-off-by: Kevin Brace <kevinbrace@bracecomputerlab.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/net/ethernet/via/via-rhine.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/net/ethernet/via/via-rhine.c b/drivers/net/ethernet/via/via-rhine.c
index ed12dbd156f03..691c041e6cfb6 100644
--- a/drivers/net/ethernet/via/via-rhine.c
+++ b/drivers/net/ethernet/via/via-rhine.c
@@ -1706,6 +1706,8 @@ static int rhine_open(struct net_device *dev)
 		goto out_free_ring;
 
 	alloc_tbufs(dev);
+	enable_mmio(rp->pioaddr, rp->quirks);
+	rhine_power_init(dev);
 	rhine_chip_reset(dev);
 	rhine_task_enable(rp);
 	init_registers(dev);
-- 
2.25.1


  parent reply	other threads:[~2020-10-12 19:08 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-12 19:02 [PATCH AUTOSEL 5.4 01/15] net: lantiq: Add locking for TX DMA channel Sasha Levin
2020-10-12 19:03 ` [PATCH AUTOSEL 5.4 04/15] drivers/net/wan/x25_asy: Correct the ndo_open and ndo_stop functions Sasha Levin
2020-10-12 19:03 ` [PATCH AUTOSEL 5.4 05/15] net: mscc: ocelot: fix fields offset in SG_CONFIG_REG_3 Sasha Levin
2020-10-12 19:03 ` [PATCH AUTOSEL 5.4 06/15] net/fsl: quieten expected MDIO access failures Sasha Levin
2020-10-12 19:03 ` [PATCH AUTOSEL 5.4 07/15] net: usb: ax88179_178a: add Toshiba usb 3.0 adapter Sasha Levin
2020-10-12 19:03 ` [PATCH AUTOSEL 5.4 08/15] net: usb: ax88179_178a: add MCT " Sasha Levin
2020-10-12 19:03 ` Sasha Levin [this message]
2020-10-12 19:03 ` [PATCH AUTOSEL 5.4 10/15] via-rhine: VTunknown1 device is really VT8251 South Bridge Sasha Levin
2020-10-12 19:03 ` [PATCH AUTOSEL 5.4 11/15] net: usb: pegasus: Proper error handing when setting pegasus' MAC address Sasha Levin
2020-10-12 19:03 ` [PATCH AUTOSEL 5.4 12/15] net: usb: rtl8150: set random MAC address when set_ethernet_addr() fails Sasha Levin
2020-10-12 19:03 ` [PATCH AUTOSEL 5.4 15/15] net: usb: qmi_wwan: add Cellient MPL200 card Sasha Levin

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