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net: fec: fix MAC internal delay doesn't work

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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, only program register when it's 2000ps.
2) only enable "enet_2x_txclk" clock when require MAC internal delay.

Fixes: fc539459e9 ("net: fec: add MAC internal delayed clock feature support")
Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com>
Link: https://lore.kernel.org/r/20210803052424.19008-1-qiangqing.zhang@nxp.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Joakim Zhang 2021-08-03 13:24:24 +08:00 committed by Jakub Kicinski
parent 421297efe6
commit b820c114eb
1 changed files with 38 additions and 10 deletions
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48
drivers/net/ethernet/freescale/fec_main.c
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@ -2042,6 +2042,34 @@ failed_clk_ptp:
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_rgmii_delay;
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");
@ -3955,6 +3982,7 @@ failed_clk_ahb:
failed_clk_ipg:
fec_enet_clk_enable(ndev, false);
failed_clk:
failed_rgmii_delay:
if (of_phy_is_fixed_link(np))
of_phy_deregister_fixed_link(np);
of_node_put(phy_node);