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net: macb: Disable PCS auto-negotiation for SGMII fixed-link mode 

When using a fixed-link configuration in SGMII mode, it's not really
sensible to have auto-negotiation enabled since the link settings are
fixed by definition. In other configurations, such as an SGMII
connection to a PHY, it should generally be enabled.

Signed-off-by: Robert Hancock <robert.hancock@calian.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Robert Hancock 2021-03-11 14:18:13 -06:00 committed by David S. Miller
parent 8fab174b78
commit e276e5e40e
2 changed files with 30 additions and 0 deletions
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14
drivers/net/ethernet/cadence/macb.h
View File

@ -159,6 +159,16 @@
#define GEM_PEFTN 0x01f4 /* PTP Peer Event Frame Tx Ns */
#define GEM_PEFRSL 0x01f8 /* PTP Peer Event Frame Rx Sec Low */
#define GEM_PEFRN 0x01fc /* PTP Peer Event Frame Rx Ns */
#define GEM_PCSCNTRL 0x0200 /* PCS Control */
#define GEM_PCSSTS 0x0204 /* PCS Status */
#define GEM_PCSPHYTOPID 0x0208 /* PCS PHY Top ID */
#define GEM_PCSPHYBOTID 0x020c /* PCS PHY Bottom ID */
#define GEM_PCSANADV 0x0210 /* PCS AN Advertisement */
#define GEM_PCSANLPBASE 0x0214 /* PCS AN Link Partner Base */
#define GEM_PCSANEXP 0x0218 /* PCS AN Expansion */
#define GEM_PCSANNPTX 0x021c /* PCS AN Next Page TX */
#define GEM_PCSANNPLP 0x0220 /* PCS AN Next Page LP */
#define GEM_PCSANEXTSTS 0x023c /* PCS AN Extended Status */
#define GEM_DCFG1 0x0280 /* Design Config 1 */
#define GEM_DCFG2 0x0284 /* Design Config 2 */
#define GEM_DCFG3 0x0288 /* Design Config 3 */
@ -478,6 +488,10 @@
#define GEM_HS_MAC_SPEED_OFFSET 0
#define GEM_HS_MAC_SPEED_SIZE 3
/* Bitfields in PCSCNTRL */
#define GEM_PCSAUTONEG_OFFSET 12
#define GEM_PCSAUTONEG_SIZE 1
/* Bitfields in DCFG1. */
#define GEM_IRQCOR_OFFSET 23
#define GEM_IRQCOR_SIZE 1

16
drivers/net/ethernet/cadence/macb_main.c
View File

@ -694,6 +694,22 @@ static void macb_mac_config(struct phylink_config *config, unsigned int mode,
if (old_ncr ^ ncr)
macb_or_gem_writel(bp, NCR, ncr);
/* Disable AN for SGMII fixed link configuration, enable otherwise.
* Must be written after PCSSEL is set in NCFGR,
* otherwise writes will not take effect.
*/
if (macb_is_gem(bp) && state->interface == PHY_INTERFACE_MODE_SGMII) {
u32 pcsctrl, old_pcsctrl;
old_pcsctrl = gem_readl(bp, PCSCNTRL);
if (mode == MLO_AN_FIXED)
pcsctrl = old_pcsctrl & ~GEM_BIT(PCSAUTONEG);
else
pcsctrl = old_pcsctrl | GEM_BIT(PCSAUTONEG);
if (old_pcsctrl != pcsctrl)
gem_writel(bp, PCSCNTRL, pcsctrl);
}
spin_unlock_irqrestore(&bp->lock, flags);
}