From: "Russell King (Oracle)" <rmk+kernel@armlinux.org.uk>
Date: Wed, 15 Mar 2023 14:46:43 +0000
Subject: [PATCH] net: pcs: xpcs: remove double-read of link state when using
AN
References: bsc#1012628
Patch-mainline: 6.3.2
Git-commit: ef63461caf427a77a04620d74ba90035a712af9c
[ Upstream commit ef63461caf427a77a04620d74ba90035a712af9c ]
Phylink does not want the current state of the link when reading the
PCS link state - it wants the latched state. Don't double-read the
MII status register. Phylink will re-read as necessary to capture
transient link-down events as of dbae3388ea9c ("net: phylink: Force
retrigger in case of latched link-fail indicator").
The above referenced commit is a dependency for this change, and thus
this change should not be backported to any kernel that does not
contain the above referenced commit.
Fixes: fcb26bd2b6ca ("net: phy: Add Synopsys DesignWare XPCS MDIO module")
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
drivers/net/pcs/pcs-xpcs.c | 13 ++-----------
1 file changed, 2 insertions(+), 11 deletions(-)
diff --git a/drivers/net/pcs/pcs-xpcs.c b/drivers/net/pcs/pcs-xpcs.c
index bc428a81..04a68535 100644
--- a/drivers/net/pcs/pcs-xpcs.c
+++ b/drivers/net/pcs/pcs-xpcs.c
@@ -321,7 +321,7 @@ static int xpcs_read_fault_c73(struct dw_xpcs *xpcs,
return 0;
}
-static int xpcs_read_link_c73(struct dw_xpcs *xpcs, bool an)
+static int xpcs_read_link_c73(struct dw_xpcs *xpcs)
{
bool link = true;
int ret;
@@ -333,15 +333,6 @@ static int xpcs_read_link_c73(struct dw_xpcs *xpcs, bool an)
if (!(ret & MDIO_STAT1_LSTATUS))
link = false;
- if (an) {
- ret = xpcs_read(xpcs, MDIO_MMD_AN, MDIO_STAT1);
- if (ret < 0)
- return ret;
-
- if (!(ret & MDIO_STAT1_LSTATUS))
- link = false;
- }
-
return link;
}
@@ -935,7 +926,7 @@ static int xpcs_get_state_c73(struct dw_xpcs *xpcs,
int ret;
/* Link needs to be read first ... */
- state->link = xpcs_read_link_c73(xpcs, state->an_enabled) > 0 ? 1 : 0;
+ state->link = xpcs_read_link_c73(xpcs) > 0 ? 1 : 0;
/* ... and then we check the faults. */
ret = xpcs_read_fault_c73(xpcs, state);
--
2.35.3