Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-12-02 00:51:44 +00:00
Code Issues Packages Projects Releases Wiki Activity

phylib: Fix auto-negotiation restart avoidance

Browse Source 
A previous patch, 51e2a3846e, made
genphy_config_aneg() not restart aneg by calling genphy_restart_aneg() if
the advertisement hadn't changed.

But, genphy_restart_aneg() doesn't just restart aneg, it may also *enable*
aneg or un-isolate the PHY from the MII (those functions are controlled by
the same register).  The code to avoid calling genphy_restart_aneg() didn't
consider this.

So, modify genphy_config_aneg() to also check if the PHY needs to have aneg
enabled or be un-isolated before deciding not to restart aneg.

This caused a problem with certain Davicom PHYs, as that driver isolates
the PHY (why?) before calling genphy_config_aneg() and expects the PHY to
be un-isolated by that function.

Signed-off-by: Trent Piepho <tpiepho@freescale.com>
Reported-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Trent Piepho 2008-11-19 15:52:41 -08:00 committed by David S. Miller
parent 31c221c49f
commit de339c2aa7
1 changed files with 23 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

34
drivers/net/phy/phy_device.c
View File

@ -564,20 +564,32 @@ EXPORT_SYMBOL(genphy_restart_aneg);
*/
int genphy_config_aneg(struct phy_device *phydev)
{
int result = 0;
int result;
if (AUTONEG_ENABLE == phydev->autoneg) {
int result = genphy_config_advert(phydev);
if (AUTONEG_ENABLE != phydev->autoneg)
return genphy_setup_forced(phydev);
if (result < 0) /* error */
return result;
result = genphy_config_advert(phydev);
/* Only restart aneg if we are advertising something different
* than we were before. */
if (result > 0)
result = genphy_restart_aneg(phydev);
} else
result = genphy_setup_forced(phydev);
if (result < 0) /* error */
return result;
if (result == 0) {
/* Advertisment hasn't changed, but maybe aneg was never on to
* begin with? Or maybe phy was isolated? */
int ctl = phy_read(phydev, MII_BMCR);
if (ctl < 0)
return ctl;
if (!(ctl & BMCR_ANENABLE) || (ctl & BMCR_ISOLATE))
result = 1; /* do restart aneg */
}
/* Only restart aneg if we are advertising something different
* than we were before. */
if (result > 0)
result = genphy_restart_aneg(phydev);
return result;
}