From: Josua Mayer josua@solid-run.com
commit 82e2c39f9ef78896e9b634dfd82dc042e6956bb7 upstream.
dp83869 internally uses a look-up table for mapping supported delays in nanoseconds to register values. When specific delays are defined in device-tree, phy_get_internal_delay does the lookup automatically returning an index.
The default case wrongly assigns the nanoseconds value from the lookup table, resulting in numeric value 2000 applied to delay configuration register, rather than the expected index values 0-7 (7 for 2000). Ultimately this issue broke RX for 1Gbps links.
Fix default delay configuration by assigning the intended index value directly.
Cc: stable@vger.kernel.org Fixes: 736b25afe284 ("net: dp83869: Add RGMII internal delay configuration") Co-developed-by: Yazan Shhady yazan.shhady@solid-run.com Signed-off-by: Yazan Shhady yazan.shhady@solid-run.com Signed-off-by: Josua Mayer josua@solid-run.com Reviewed-by: Simon Horman simon.horman@corigine.com Link: https://lore.kernel.org/r/20230323102536.31988-1-josua@solid-run.com Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/phy/dp83869.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-)
--- a/drivers/net/phy/dp83869.c +++ b/drivers/net/phy/dp83869.c @@ -553,15 +553,13 @@ static int dp83869_of_init(struct phy_de &dp83869_internal_delay[0], delay_size, true); if (dp83869->rx_int_delay < 0) - dp83869->rx_int_delay = - dp83869_internal_delay[DP83869_CLK_DELAY_DEF]; + dp83869->rx_int_delay = DP83869_CLK_DELAY_DEF;
dp83869->tx_int_delay = phy_get_internal_delay(phydev, dev, &dp83869_internal_delay[0], delay_size, false); if (dp83869->tx_int_delay < 0) - dp83869->tx_int_delay = - dp83869_internal_delay[DP83869_CLK_DELAY_DEF]; + dp83869->tx_int_delay = DP83869_CLK_DELAY_DEF;
return ret; }