2024-03-05 11:22:30

by Tim Pambor

Subject: [PATCH net-next v3] net: phy: dp83822: Fix RGMII TX delay configuration

The logic for enabling the TX clock shift is inverse of enabling the RX
clock shift. The TX clock shift is disabled when DP83822_TX_CLK_SHIFT is
set. Correct the current behavior and always write the delay configuration
to ensure consistent delay settings regardless of bootloader configuration.

Reference: https://www.ti.com/lit/ds/symlink/dp83822i.pdf p. 69

Fixes: 8095295292b5 ("net: phy: DP83822: Add setting the fixed internal delay")
Signed-off-by: Tim Pambor <[email protected]>
---
Changes in v3:
- Revert changes involving DP83822_RGMII_MODE_EN
- Rebase on net-next
Changes in v2:
- Further cleanup of RGMII configuration
- Check for errors setting DP83822_RGMII_MODE_EN
---
drivers/net/phy/dp83822.c | 37 ++++++++++++++++++++-----------------
1 file changed, 20 insertions(+), 17 deletions(-)

diff --git a/drivers/net/phy/dp83822.c b/drivers/net/phy/dp83822.c
index 95178e26a060..c3426a17e6d0 100644
--- a/drivers/net/phy/dp83822.c
+++ b/drivers/net/phy/dp83822.c
@@ -402,7 +402,7 @@ static int dp83822_config_init(struct phy_device *phydev)
{
struct dp83822_private *dp83822 = phydev->priv;
struct device *dev = &phydev->mdio.dev;
- int rgmii_delay;
+ int rgmii_delay = 0;
s32 rx_int_delay;
s32 tx_int_delay;
int err = 0;
@@ -412,30 +412,33 @@ static int dp83822_config_init(struct phy_device *phydev)
rx_int_delay = phy_get_internal_delay(phydev, dev, NULL, 0,
true);

- if (rx_int_delay <= 0)
- rgmii_delay = 0;
- else
- rgmii_delay = DP83822_RX_CLK_SHIFT;
+ /* Set DP83822_RX_CLK_SHIFT to enable rx clk internal delay */
+ if (rx_int_delay > 0)
+ rgmii_delay |= DP83822_RX_CLK_SHIFT;

tx_int_delay = phy_get_internal_delay(phydev, dev, NULL, 0,
false);
+
+ /* Set DP83822_TX_CLK_SHIFT to disable tx clk internal delay */
if (tx_int_delay <= 0)
- rgmii_delay &= ~DP83822_TX_CLK_SHIFT;
- else
rgmii_delay |= DP83822_TX_CLK_SHIFT;

- if (rgmii_delay) {
- err = phy_set_bits_mmd(phydev, DP83822_DEVADDR,
- MII_DP83822_RCSR, rgmii_delay);
- if (err)
- return err;
- }
+ err = phy_modify_mmd(phydev, DP83822_DEVADDR, MII_DP83822_RCSR,
+ DP83822_RX_CLK_SHIFT | DP83822_TX_CLK_SHIFT, rgmii_delay);
+ if (err)
+ return err;
+
+ err = phy_set_bits_mmd(phydev, DP83822_DEVADDR,
+ MII_DP83822_RCSR, DP83822_RGMII_MODE_EN);

- phy_set_bits_mmd(phydev, DP83822_DEVADDR,
- MII_DP83822_RCSR, DP83822_RGMII_MODE_EN);
+ if (err)
+ return err;
} else {
- phy_clear_bits_mmd(phydev, DP83822_DEVADDR,
- MII_DP83822_RCSR, DP83822_RGMII_MODE_EN);
+ err = phy_clear_bits_mmd(phydev, DP83822_DEVADDR,
+ MII_DP83822_RCSR, DP83822_RGMII_MODE_EN);
+
+ if (err)
+ return err;
}

if (dp83822->fx_enabled) {
--
2.43.0

2024-03-09 05:30:39

by patchwork-bot+netdevbpf

Subject: Re: [PATCH net-next v3] net: phy: dp83822: Fix RGMII TX delay configuration

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <[email protected]>:

On Tue, 5 Mar 2024 12:06:08 +0100 you wrote:
> The logic for enabling the TX clock shift is inverse of enabling the RX
> clock shift. The TX clock shift is disabled when DP83822_TX_CLK_SHIFT is
> set. Correct the current behavior and always write the delay configuration
> to ensure consistent delay settings regardless of bootloader configuration.
>
> Reference: https://www.ti.com/lit/ds/symlink/dp83822i.pdf p. 69
>
> [...]

Here is the summary with links:
- [net-next,v3] net: phy: dp83822: Fix RGMII TX delay configuration
https://git.kernel.org/netdev/net/c/c8a5c731fd12

You are awesome, thank you!
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