[PATCH net-next] net: fec: fix MAC internal delay doesn't work
From: Joakim Zhang <hidden>
Date: 2021-07-30 11:47:49
This patch intends to fix MAC internal delay doesn't work, due to use
of_property_read_u32() incorrectly, and improve this feature a bit:
1) check the delay value if valid.
2) only enable "enet_2x_txclk" clock when require MAC internal delay.
Fixes: fc539459e900 ("net: fec: add MAC internal delayed clock feature support")
Signed-off-by: Joakim Zhang <redacted>
---
Hi Andrew,
This fix targes to net-next as this is where the offending patch was applied.
When refine Andy Duan's patch to generic MAC internal delay property, I
did make a mistake, and didn't find it during test on i.MX8MM, since the
lack of chips which support this feature at my side. I am so sorry about this.
Please help review if there is some flaw in the logic.
Joakim
---
drivers/net/ethernet/freescale/fec_main.c | 47 ++++++++++++++++++-----
1 file changed, 37 insertions(+), 10 deletions(-)
diff --git a/drivers/net/ethernet/freescale/fec_main.c b/drivers/net/ethernet/freescale/fec_main.c
index 40ea318d7396..a9b889bf375a 100644
--- a/drivers/net/ethernet/freescale/fec_main.c
+++ b/drivers/net/ethernet/freescale/fec_main.c@@ -2042,6 +2042,34 @@ static int fec_enet_clk_enable(struct net_device *ndev, bool enable) return ret; } +static int fec_enet_parse_rgmii_delay(struct fec_enet_private *fep, + struct device_node *np) +{ + u32 rgmii_tx_delay, rgmii_rx_delay; + + /* For rgmii tx internal delay, valid values are 0ps and 2000ps */ + if (!of_property_read_u32(np, "tx-internal-delay-ps", &rgmii_tx_delay)) { + if (rgmii_tx_delay != 0 && rgmii_tx_delay != 2000) { + dev_err(&fep->pdev->dev, "The only allowed RGMII TX delay values are: 0ps, 2000ps"); + return -EINVAL; + } else if (rgmii_tx_delay == 2000) { + fep->rgmii_txc_dly = true; + } + } + + /* For rgmii rx internal delay, valid values are 0ps and 2000ps */ + if (!of_property_read_u32(np, "rx-internal-delay-ps", &rgmii_rx_delay)) { + if (rgmii_rx_delay != 0 && rgmii_rx_delay != 2000) { + dev_err(&fep->pdev->dev, "The only allowed RGMII RX delay values are: 0ps, 2000ps"); + return -EINVAL; + } else if (rgmii_rx_delay == 2000) { + fep->rgmii_rxc_dly = true; + } + } + + return 0; +} + static int fec_enet_mii_probe(struct net_device *ndev) { struct fec_enet_private *fep = netdev_priv(ndev);
@@ -3719,7 +3747,6 @@ fec_probe(struct platform_device *pdev) char irq_name[8]; int irq_cnt; struct fec_devinfo *dev_info; - u32 rgmii_delay; fec_enet_get_queue_num(pdev, &num_tx_qs, &num_rx_qs);
@@ -3777,12 +3804,6 @@ fec_probe(struct platform_device *pdev) if (ret) goto failed_stop_mode; - /* For rgmii internal delay, valid values are 0ps and 2000ps */ - if (of_property_read_u32(np, "tx-internal-delay-ps", &rgmii_delay)) - fep->rgmii_txc_dly = true; - if (of_property_read_u32(np, "rx-internal-delay-ps", &rgmii_delay)) - fep->rgmii_rxc_dly = true; - phy_node = of_parse_phandle(np, "phy-handle", 0); if (!phy_node && of_phy_is_fixed_link(np)) { ret = of_phy_register_fixed_link(np);
@@ -3806,6 +3827,10 @@ fec_probe(struct platform_device *pdev) fep->phy_interface = interface; } + ret = fec_enet_parse_rgmii_delay(fep, np); + if (ret) + goto failed_phy; + fep->clk_ipg = devm_clk_get(&pdev->dev, "ipg"); if (IS_ERR(fep->clk_ipg)) { ret = PTR_ERR(fep->clk_ipg);
@@ -3835,9 +3860,11 @@ fec_probe(struct platform_device *pdev) fep->clk_ref_rate = clk_get_rate(fep->clk_ref); /* clk_2x_txclk is optional, depends on board */ - fep->clk_2x_txclk = devm_clk_get(&pdev->dev, "enet_2x_txclk"); - if (IS_ERR(fep->clk_2x_txclk)) - fep->clk_2x_txclk = NULL; + if (fep->rgmii_txc_dly || fep->rgmii_rxc_dly) { + fep->clk_2x_txclk = devm_clk_get(&pdev->dev, "enet_2x_txclk"); + if (IS_ERR(fep->clk_2x_txclk)) + fep->clk_2x_txclk = NULL; + } fep->bufdesc_ex = fep->quirks & FEC_QUIRK_HAS_BUFDESC_EX; fep->clk_ptp = devm_clk_get(&pdev->dev, "ptp");
--
2.17.1