net: phy: phy drivers should not set SUPPORTED_[Asym_]Pause

Instead of having individual PHY drivers set the SUPPORTED_Pause and
SUPPORTED_Asym_Pause flags, phylib itself should set those flags,
unless there is a hardware erratum or other special case.  During
autonegotiation, the PHYs will determine whether to enable pause
frame support.

Pause frames are a feature that is supported by the MAC.  It is the MAC
that generates the frames and that processes them.  The PHY can only be
configured to allow them to pass through.

This commit also effectively reverts the recently applied c7a61319
("net: phy: dp83848: Support ethernet pause frames").

So the new process is:

1) Unless the PHY driver overrides it, phylib sets the SUPPORTED_Pause
and SUPPORTED_AsymPause bits in phydev->supported.  This indicates that
the PHY supports pause frames.

2) The MAC driver checks phydev->supported before it calls phy_start().
If (SUPPORTED_Pause | SUPPORTED_AsymPause) is set, then the MAC driver
sets those bits in phydev->advertising, if it wants to enable pause
frame support.

3) When the link state changes, the MAC driver checks phydev->pause and
phydev->asym_pause,  If the bits are set, then it enables the corresponding
features in the MAC.  The algorithm is:

	if (phydev->pause)
		The MAC should be programmed to receive and honor
                pause frames it receives, i.e. enable receive flow control.

	if (phydev->pause != phydev->asym_pause)
		The MAC should be programmed to transmit pause
		frames when needed, i.e. enable transmit flow control.

Signed-off-by: Timur Tabi <timur@codeaurora.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 19 insertions, 0 deletions

diff --git a/drivers/net/phy/phy_device.c b/drivers/net/phy/phy_device.c
index 0aadef9fc7dd..9c06f8028f0c 100644
--- a/drivers/net/phy/phy_device.c
+++ b/drivers/net/phy/phy_device.c
@@ -1719,6 +1719,25 @@ static int phy_probe(struct device *dev)
 	 */
 	of_set_phy_eee_broken(phydev);
 
+	/* The Pause Frame bits indicate that the PHY can support passing
+	 * pause frames. During autonegotiation, the PHYs will determine if
+	 * they should allow pause frames to pass.  The MAC driver should then
+	 * use that result to determine whether to enable flow control via
+	 * pause frames.
+	 *
+	 * Normally, PHY drivers should not set the Pause bits, and instead
+	 * allow phylib to do that.  However, there may be some situations
+	 * (e.g. hardware erratum) where the driver wants to set only one
+	 * of these bits.
+	 */
+	if (phydrv->features & (SUPPORTED_Pause | SUPPORTED_Asym_Pause)) {
+		phydev->supported &= ~(SUPPORTED_Pause | SUPPORTED_Asym_Pause);
+		phydev->supported |= phydrv->features &
+				     (SUPPORTED_Pause | SUPPORTED_Asym_Pause);
+	} else {
+		phydev->supported |= SUPPORTED_Pause | SUPPORTED_Asym_Pause;
+	}
+
 	/* Set the state to READY by default */
 	phydev->state = PHY_READY;