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lan78xx: PHY DSP registers initialization to address EEE link drop issues with long cables

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The patch is to configure DSP registers of PHY device
to handle Gbe-EEE failures with >40m cable length.

Fixes: 55d7de9de6 ("Microchip's LAN7800 family USB 2/3 to 10/100/1000 Ethernet device driver")
Signed-off-by: Raghuram Chary J <raghuramchary.jallipalli@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Raghuram Chary J
2018-04-11 20:36:36 +05:30
committed by David S. Miller
parent 9a43816182
commit 1c2734b31d
2 changed files with 185 additions and 1 deletions
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8
include/linux/microchipphy.h
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@@ -70,4 +70,12 @@
#define LAN88XX_MMD3_CHIP_ID (32877)
#define LAN88XX_MMD3_CHIP_REV (32878)
/* DSP registers */
#define PHY_ARDENNES_MMD_DEV_3_PHY_CFG (0x806A)
#define PHY_ARDENNES_MMD_DEV_3_PHY_CFG_ZD_DLY_EN_ (0x2000)
#define LAN88XX_EXT_PAGE_ACCESS_TR (0x52B5)
#define LAN88XX_EXT_PAGE_TR_CR 16
#define LAN88XX_EXT_PAGE_TR_LOW_DATA 17
#define LAN88XX_EXT_PAGE_TR_HIGH_DATA 18
#endif /* _MICROCHIPPHY_H */