[PATCH net-next v2] net: phy: marvell: add sleep time after enabling the loopback bit

Aminuddin Jamaluddin
2022-11-08T07:45:15Z

Sleep time is added to ensure the phy to be ready after loopback
bit was set. This to prevent the phy loopback test from failing.

---
V1: https://patchwork.kernel.org/project/netdevbpf/patch/20220825082238.11056-1-aminuddin.jamaluddin@intel.com/
---

Fixes: 020a45aff119 ("net: phy: marvell: add Marvell specific PHY loopback")
Cc: <stable@vger.kernel.org> # 5.15.x
Signed-off-by: Muhammad Husaini Zulkifli <muhammad.husaini.zulkifli@intel.com>
Signed-off-by: Aminuddin Jamaluddin <aminuddin.jamaluddin@intel.com>
---
drivers/net/phy/marvell.c | 16 +++++++++-------
1 file changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/net/phy/marvell.c b/drivers/net/phy/marvell.c
index a3e810705ce2..860610ba4d00 100644
--- a/drivers/net/phy/marvell.c
+++ b/drivers/net/phy/marvell.c
@@ -2015,14 +2015,16 @@ static int m88e1510_loopback(struct phy_device *phydev, bool enable)
if (err < 0)
return err;

- /* FIXME: Based on trial and error test, it seem 1G need to have
- * delay between soft reset and loopback enablement.
- */
- if (phydev->speed == SPEED_1000)
- msleep(1000);
+ err = phy_modify(phydev, MII_BMCR, BMCR_LOOPBACK,
+ BMCR_LOOPBACK);

- return phy_modify(phydev, MII_BMCR, BMCR_LOOPBACK,
- BMCR_LOOPBACK);
+ if (!err) {
+ /* It takes some time for PHY device to switch
+ * into/out-of loopback mode.
+ */
+ msleep(1000);
+ }
+ return err;
} else {
err = phy_modify(phydev, MII_BMCR, BMCR_LOOPBACK, 0);
if (err < 0)
--
2.17.1