[PATCH net-next] net: phy: micrel: Adding SQI support for lan8814 phy

Divya Koppera
2022-08-25T08:06:24Z

Supports SQI(Signal Quality Index) for lan8814 phy, where
it has SQI index of 0-7 values and this indicator can be used
for cable integrity diagnostic and investigating other noise
sources.

Signed-off-by: Divya Koppera <Divya.Koppera@microchip.com>
---
drivers/net/phy/micrel.c | 35 +++++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)

diff --git a/drivers/net/phy/micrel.c b/drivers/net/phy/micrel.c
index e78d0bf69bc3..3775da7afc64 100644
--- a/drivers/net/phy/micrel.c
+++ b/drivers/net/phy/micrel.c
@@ -1975,6 +1975,13 @@ static int ksz886x_cable_test_get_status(struct phy_device *phydev,
#define LAN8814_CLOCK_MANAGEMENT 0xd
#define LAN8814_LINK_QUALITY 0x8e

+#define LAN8814_DCQ_CTRL 0xe6
+#define LAN8814_DCQ_CTRL_READ_CAPTURE_ BIT(15)
+#define LAN8814_DCQ_CTRL_CHANNEL_MASK GENMASK(1, 0)
+#define LAN8814_DCQ_SQI 0xe4
+#define LAN8814_DCQ_SQI_MAX 7
+#define LAN8814_DCQ_SQI_VAL_MASK GENMASK(3, 1)
+
static int lanphy_read_page_reg(struct phy_device *phydev, int page, u32 addr)
{
int data;
@@ -2927,6 +2934,32 @@ static int lan8814_probe(struct phy_device *phydev)
return 0;
}

+static int lan8814_get_sqi(struct phy_device *phydev)
+{
+ int rc, val;
+
+ val = lanphy_read_page_reg(phydev, 1, LAN8814_DCQ_CTRL);
+ if (val < 0)
+ return val;
+
+ val &= ~LAN8814_DCQ_CTRL_CHANNEL_MASK;
+ val |= LAN8814_DCQ_CTRL_READ_CAPTURE_;
+ rc = lanphy_write_page_reg(phydev, 1, LAN8814_DCQ_CTRL, val);
+ if (rc < 0)
+ return rc;
+
+ rc = lanphy_read_page_reg(phydev, 1, LAN8814_DCQ_SQI);
+ if (rc < 0)
+ return rc;
+
+ return FIELD_GET(LAN8814_DCQ_SQI_VAL_MASK, rc);
+}
+
+static int lan8814_get_sqi_max(struct phy_device *phydev)
+{
+ return LAN8814_DCQ_SQI_MAX;
+}
+
static struct phy_driver ksphy_driver[] = {
{
.phy_id = PHY_ID_KS8737,
@@ -3117,6 +3150,8 @@ static struct phy_driver ksphy_driver[] = {
.resume = kszphy_resume,
.config_intr = lan8814_config_intr,
.handle_interrupt = lan8814_handle_interrupt,
+ .get_sqi = lan8814_get_sqi,
+ .get_sqi_max = lan8814_get_sqi_max,
}, {
.phy_id = PHY_ID_LAN8804,
.phy_id_mask = MICREL_PHY_ID_MASK,
--
2.17.1