From c0308743202449028d2b839d9b01d3d5ed2b210a Mon Sep 17 00:00:00 2001 From: Vladimir Oltean Date: Wed, 27 Nov 2019 19:21:13 +0200 Subject: [PATCH] enetc: Set MDIO_CFG_HOLD to the recommended value of 2 This increases the MDIO hold time to 5 enet_clk cycles from the previous value of 0. This is actually the out-of-reset value, that the driver was previously overwriting with 0. Zero worked for the external MDIO, but breaks communication with the internal MDIO buses on which the PCS of ENETC SI's and Felix switch are found. Signed-off-by: Vladimir Oltean --- drivers/net/ethernet/freescale/enetc/enetc_mdio.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) --- a/drivers/net/ethernet/freescale/enetc/enetc_mdio.c +++ b/drivers/net/ethernet/freescale/enetc/enetc_mdio.c @@ -31,15 +31,19 @@ static inline void _enetc_mdio_wr(struct _enetc_mdio_wr(mdio_priv, ENETC_##off, val) #define enetc_mdio_rd_reg(off) enetc_mdio_rd(mdio_priv, off) -#define ENETC_MDC_DIV 258 - #define MDIO_CFG_CLKDIV(x) ((((x) >> 1) & 0xff) << 8) #define MDIO_CFG_BSY BIT(0) #define MDIO_CFG_RD_ER BIT(1) +#define MDIO_CFG_HOLD(x) (((x) << 2) & GENMASK(4, 2)) #define MDIO_CFG_ENC45 BIT(6) /* external MDIO only - driven on neg MDC edge */ #define MDIO_CFG_NEG BIT(23) +#define ENETC_EMDIO_CFG \ + (MDIO_CFG_HOLD(2) | \ + MDIO_CFG_CLKDIV(258) | \ + MDIO_CFG_NEG) + #define MDIO_CTL_DEV_ADDR(x) ((x) & 0x1f) #define MDIO_CTL_PORT_ADDR(x) (((x) & 0x1f) << 5) #define MDIO_CTL_READ BIT(15) @@ -61,7 +65,7 @@ int enetc_mdio_write(struct mii_bus *bus u16 dev_addr; int ret; - mdio_cfg = MDIO_CFG_CLKDIV(ENETC_MDC_DIV) | MDIO_CFG_NEG; + mdio_cfg = ENETC_EMDIO_CFG; if (regnum & MII_ADDR_C45) { dev_addr = (regnum >> 16) & 0x1f; mdio_cfg |= MDIO_CFG_ENC45; @@ -108,7 +112,7 @@ int enetc_mdio_read(struct mii_bus *bus, u16 dev_addr, value; int ret; - mdio_cfg = MDIO_CFG_CLKDIV(ENETC_MDC_DIV) | MDIO_CFG_NEG; + mdio_cfg = ENETC_EMDIO_CFG; if (regnum & MII_ADDR_C45) { dev_addr = (regnum >> 16) & 0x1f; mdio_cfg |= MDIO_CFG_ENC45;