[PATCH v2] net: phy: dp83867: Extend RX strap quirk for SGMII mode

[PATCH v2] net: phy: dp83867: Extend RX strap quirk for SGMII mode

[Harini Katakam]

When RX strap in HW is not set to MODE 3 or 4, bit 7 and 8 in CF4
register should be set. The former is already handled in
dp83867_config_init; add the latter in SGMII specific initialization.

Fixes: 2a10154abcb7 ("net: phy: dp83867: Add TI dp83867 phy")
Signed-off-by: Harini Katakam <harini.katakam@amd.com>
---
 drivers/net/phy/dp83867.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/drivers/net/phy/dp83867.c b/drivers/net/phy/dp83867.c
index 6939563d3b7c..417527f8bbf5 100644
--- a/drivers/net/phy/dp83867.c
+++ b/drivers/net/phy/dp83867.c
@@ -853,6 +853,14 @@ static int dp83867_config_init(struct phy_device *phydev)
 		else
 			val &= ~DP83867_SGMII_TYPE;
 		phy_write_mmd(phydev, DP83867_DEVADDR, DP83867_SGMIICTL, val);
+
+		/* This is a SW workaround for link instability if RX_CTRL is
+		 * not strapped to mode 3 or 4 in HW. This is required for SGMII
+		 * in addition to clearing bit 7, handled above.
+		 */
+		if (dp83867->rxctrl_strap_quirk)
+			phy_set_bits_mmd(phydev, DP83867_DEVADDR, DP83867_CFG4,
+					 BIT(8));
 	}
 
 	val = phy_read(phydev, DP83867_CFG3);
-- 
2.17.1

Re: [PATCH v2] net: phy: dp83867: Extend RX strap quirk for SGMII mode

[Andrew Lunn]

On Fri, Oct 14, 2022 at 12:17:35PM +0530, Harini Katakam wrote:
> When RX strap in HW is not set to MODE 3 or 4, bit 7 and 8 in CF4
> register should be set. The former is already handled in
> dp83867_config_init; add the latter in SGMII specific initialization.
> 
> Fixes: 2a10154abcb7 ("net: phy: dp83867: Add TI dp83867 phy")
> Signed-off-by: Harini Katakam <harini.katakam@amd.com>

Reviewed-by: Andrew Lunn <andrew@lunn.ch>

Please see the netdev FAQ. You are supposed to put the tree this patch
is for in the subject line, [PATCH net v2] ... etc. Please remember
this for next time.

    Andrew

Re: [PATCH v2] net: phy: dp83867: Extend RX strap quirk for SGMII mode

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (master)
by David S. Miller <davem@davemloft.net>:

On Fri, 14 Oct 2022 12:17:35 +0530 you wrote:
> When RX strap in HW is not set to MODE 3 or 4, bit 7 and 8 in CF4
> register should be set. The former is already handled in
> dp83867_config_init; add the latter in SGMII specific initialization.
> 
> Fixes: 2a10154abcb7 ("net: phy: dp83867: Add TI dp83867 phy")
> Signed-off-by: Harini Katakam <harini.katakam@amd.com>
> 
> [...]

Here is the summary with links:
  - [v2] net: phy: dp83867: Extend RX strap quirk for SGMII mode
    https://git.kernel.org/netdev/net/c/0c9efbd5c50c

You are awesome, thank you!
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