net: phy: meson-gxl: improve link-up behavior

Sometimes the link comes up but no data flows. This patch fixes
this behavior. It's not clear what's the root cause of the issue.

According to the tests one other link-up issue remains.
In very rare cases the link isn't even reported as up.

Fixes: 84c8f773d2dc ("net: phy: meson-gxl: remove the use of .ack_callback()")
Tested-by: Erico Nunes <nunes.erico@gmail.com>
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Link: https://lore.kernel.org/r/e3473452-a1f9-efcf-5fdd-02b6f44c3fcd@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/drivers/net/phy/meson-gxl.c b/drivers/net/phy/meson-gxl.c
index c49062ad72c6c6922e18a26c68c2d96627da906e..73f7962a37d335508b4a09e82d01132822c3b98f 100644 (file)
--- a/drivers/net/phy/meson-gxl.c
+++ b/drivers/net/phy/meson-gxl.c
@@ -243,7 +243,13 @@ static irqreturn_t meson_gxl_handle_interrupt(struct phy_device *phydev)
            irq_status == INTSRC_ENERGY_DETECT)
                return IRQ_HANDLED;
 
-       phy_trigger_machine(phydev);
+       /* Give PHY some time before MAC starts sending data. This works
+        * around an issue where network doesn't come up properly.
+        */
+       if (!(irq_status & INTSRC_LINK_DOWN))
+               phy_queue_state_machine(phydev, msecs_to_jiffies(100));
+       else
+               phy_trigger_machine(phydev);
 
        return IRQ_HANDLED;
 }