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ath79: force SGMII SerDes mode to MAC operation 

The mode on the SGMII SerDes on the QCA9563 is 1000 Base-X by default.
This only allows for 1000 Mbit/s links, however when used with an SGMII
PHY in 100 Mbit/s link mode, the link remains dead.

This strictly has nothing to do with the SerDes calibration, however it
is done at the same point in the QCA reference U-Boot which is the
blueprint for everything happening here. As the current state is more or
less a hack, this should be fine.

This fixes the issues outlined above on a TP-Link EAP-225 Outdoor.

Reported-by: Tom Herbers <freifunk@tomherbers.de>
Tested-by: Tom Herbers <freifunk@tomherbers.de>
Signed-off-by: David Bauer <mail@david-bauer.net>
This commit is contained in:
David Bauer 2021-04-01 01:20:45 +02:00
parent e85180d90e
commit fbbad9a9a6
2 changed files with 14 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
target/linux/ath79/files/drivers/net/ethernet/atheros/ag71xx/ag71xx_main.c
View File

@ -602,6 +602,11 @@ static void ag71xx_sgmii_serdes_init_qca956x(struct device_node *np)
goto err_iomap;
}
t = __raw_readl(gmac_base + QCA956X_GMAC_REG_SGMII_CONFIG);
t &= ~(QCA956X_SGMII_CONFIG_MODE_CTRL_MASK << QCA956X_SGMII_CONFIG_MODE_CTRL_SHIFT);
t |= QCA956X_SGMII_CONFIG_MODE_CTRL_SGMII_MAC;
__raw_writel(t, gmac_base + QCA956X_GMAC_REG_SGMII_CONFIG);
pr_debug("%pOF: fixup SERDES calibration to value %i\n",
np_dev, serdes_cal);
t = __raw_readl(gmac_base + QCA956X_GMAC_REG_SGMII_SERDES);

9
target/linux/ath79/patches-5.4/0040-ath79-sgmii-config.patch Normal file
View File

@ -0,0 +1,9 @@
--- a/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
+++ b/arch/mips/include/asm/mach-ath79/ar71xx_regs.h
@@ -1376,5 +1376,6 @@
#define QCA956X_SGMII_CONFIG_MODE_CTRL_SHIFT 0
#define QCA956X_SGMII_CONFIG_MODE_CTRL_MASK 0x7
+#define QCA956X_SGMII_CONFIG_MODE_CTRL_SGMII_MAC 0x2
#endif /* __ASM_MACH_AR71XX_REGS_H */