Thread (3 messages) flat view 3 messages, 2 authors, 2021-09-24

Re: [PATCH] net: phy: enhance GPY115 loopback disable function

From: Andrew Lunn <andrew@lunn.ch>
Date: 2021-09-24 11:59:59

On Fri, Sep 24, 2021 at 05:05:37PM +0800, Xu Liang wrote:
quoted hunk ↗ jump to hunk
GPY115 need reset PHY when it comes out from loopback mode if the firmware
version number (lower 8 bits) is equal to or below 0x76.

Signed-off-by: Xu Liang <lxu@maxlinear.com>
---
 drivers/net/phy/mxl-gpy.c | 30 ++++++++++++++++++++++++++++--
 1 file changed, 28 insertions(+), 2 deletions(-)
diff --git a/drivers/net/phy/mxl-gpy.c b/drivers/net/phy/mxl-gpy.c
index 2d5d5081c3b6..3ef62d5c4776 100644
--- a/drivers/net/phy/mxl-gpy.c
+++ b/drivers/net/phy/mxl-gpy.c
@@ -493,6 +493,32 @@ static int gpy_loopback(struct phy_device *phydev, bool enable)
 	return ret;
 }
 
+static int gpy115_loopback(struct phy_device *phydev, bool enable)
+{
+	int ret;
+	int fw_minor;
+
+	if (enable)
+		return gpy_loopback(phydev, enable);
+
+	/* Show GPY PHY FW version in dmesg */
You don't show anything.
+	ret = phy_read(phydev, PHY_FWV);
+	if (ret < 0)
+		return ret;
+
+	fw_minor = FIELD_GET(PHY_FWV_MINOR_MASK, ret);
+	if (fw_minor > 0x0076)
+		return gpy_loopback(phydev, 0);
+
+	ret = phy_modify(phydev, MII_BMCR, BMCR_LOOPBACK, BMCR_RESET);
+	if (!ret) {
+		/* Some delay for the reset complete. */
+		msleep(100);
+	}
genphy_soft_reset() would be better. Does a soft reset clear the
BMCR_LOOPBACK bit? It should do, according to C22.

	      Andrew
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