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Subject[PATCH net-next v4 4/4] net: dp83869: Add RGMII internal delay configuration
Date
Add RGMII internal delay configuration for Rx and Tx.

Signed-off-by: Dan Murphy <dmurphy@ti.com>
---
drivers/net/phy/dp83869.c | 82 +++++++++++++++++++++++++++++++++++++--
1 file changed, 79 insertions(+), 3 deletions(-)

diff --git a/drivers/net/phy/dp83869.c b/drivers/net/phy/dp83869.c
index cfb22a21a2e6..ba1e3d599888 100644
--- a/drivers/net/phy/dp83869.c
+++ b/drivers/net/phy/dp83869.c
@@ -64,6 +64,10 @@
#define DP83869_RGMII_TX_CLK_DELAY_EN BIT(1)
#define DP83869_RGMII_RX_CLK_DELAY_EN BIT(0)

+/* RGMIIDCTL */
+#define DP83869_RGMII_CLK_DELAY_SHIFT 4
+#define DP83869_CLK_DELAY_DEF 7
+
/* STRAP_STS1 bits */
#define DP83869_STRAP_OP_MODE_MASK GENMASK(2, 0)
#define DP83869_STRAP_STS1_RESERVED BIT(11)
@@ -78,9 +82,6 @@
#define DP83869_PHYCR_FIFO_DEPTH_MASK GENMASK(15, 12)
#define DP83869_PHYCR_RESERVED_MASK BIT(11)

-/* RGMIIDCTL bits */
-#define DP83869_RGMII_TX_CLK_DELAY_SHIFT 4
-
/* IO_MUX_CFG bits */
#define DP83869_IO_MUX_CFG_IO_IMPEDANCE_CTRL 0x1f

@@ -99,6 +100,10 @@
#define DP83869_OP_MODE_MII BIT(5)
#define DP83869_SGMII_RGMII_BRIDGE BIT(6)

+static const int dp83869_internal_delay[] = {250, 500, 750, 1000, 1250, 1500,
+ 1750, 2000, 2250, 2500, 2750, 3000,
+ 3250, 3500, 3750, 4000};
+
enum {
DP83869_PORT_MIRRORING_KEEP,
DP83869_PORT_MIRRORING_EN,
@@ -108,6 +113,8 @@ enum {
struct dp83869_private {
int tx_fifo_depth;
int rx_fifo_depth;
+ s32 rx_id_delay;
+ s32 tx_id_delay;
int io_impedance;
int port_mirroring;
bool rxctrl_strap_quirk;
@@ -232,6 +239,22 @@ static int dp83869_of_init(struct phy_device *phydev)
&dp83869->tx_fifo_depth))
dp83869->tx_fifo_depth = DP83869_PHYCR_FIFO_DEPTH_4_B_NIB;

+ ret = of_property_read_u32(of_node, "rx-internal-delay-ps",
+ &dp83869->rx_id_delay);
+ if (ret) {
+ dp83869->rx_id_delay =
+ dp83869_internal_delay[DP83869_CLK_DELAY_DEF];
+ ret = 0;
+ }
+
+ ret = of_property_read_u32(of_node, "tx-internal-delay-ps",
+ &dp83869->tx_id_delay);
+ if (ret) {
+ dp83869->tx_id_delay =
+ dp83869_internal_delay[DP83869_CLK_DELAY_DEF];
+ ret = 0;
+ }
+
return ret;
}
#else
@@ -367,10 +390,35 @@ static int dp83869_configure_mode(struct phy_device *phydev,
return ret;
}

+static int dp83869_get_delay(struct phy_device *phydev)
+{
+ struct dp83869_private *dp83869 = phydev->priv;
+ int delay_size = ARRAY_SIZE(dp83869_internal_delay);
+ int tx_delay;
+ int rx_delay;
+
+ tx_delay = phy_get_delay_index(phydev, &dp83869_internal_delay[0],
+ delay_size, dp83869->tx_id_delay);
+ if (tx_delay < 0) {
+ phydev_err(phydev, "Tx internal delay is invalid\n");
+ return tx_delay;
+ }
+
+ rx_delay = phy_get_delay_index(phydev, &dp83869_internal_delay[0],
+ delay_size, dp83869->rx_id_delay);
+ if (rx_delay < 0) {
+ phydev_err(phydev, "Rx internal delay is invalid\n");
+ return rx_delay;
+ }
+
+ return rx_delay | tx_delay << DP83869_RGMII_CLK_DELAY_SHIFT;
+}
+
static int dp83869_config_init(struct phy_device *phydev)
{
struct dp83869_private *dp83869 = phydev->priv;
int ret, val;
+ int delay;

ret = dp83869_configure_mode(phydev, dp83869);
if (ret)
@@ -394,6 +442,34 @@ static int dp83869_config_init(struct phy_device *phydev)
dp83869->clk_output_sel <<
DP83869_IO_MUX_CFG_CLK_O_SEL_SHIFT);

+ if (phy_interface_is_rgmii(phydev)) {
+ delay = dp83869_get_delay(phydev);
+ if (delay < 0)
+ return delay;
+
+ ret = phy_write_mmd(phydev, DP83869_DEVADDR, DP83869_RGMIIDCTL,
+ delay);
+ if (ret)
+ return ret;
+
+ val = phy_read_mmd(phydev, DP83869_DEVADDR, DP83869_RGMIICTL);
+ val &= ~(DP83869_RGMII_TX_CLK_DELAY_EN |
+ DP83869_RGMII_RX_CLK_DELAY_EN);
+
+ if (phydev->interface == PHY_INTERFACE_MODE_RGMII_ID)
+ val |= (DP83869_RGMII_TX_CLK_DELAY_EN |
+ DP83869_RGMII_RX_CLK_DELAY_EN);
+
+ if (phydev->interface == PHY_INTERFACE_MODE_RGMII_TXID)
+ val |= DP83869_RGMII_TX_CLK_DELAY_EN;
+
+ if (phydev->interface == PHY_INTERFACE_MODE_RGMII_RXID)
+ val |= DP83869_RGMII_RX_CLK_DELAY_EN;
+
+ ret = phy_write_mmd(phydev, DP83869_DEVADDR, DP83869_RGMIICTL,
+ val);
+ }
+
return ret;
}

--
2.26.2
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