5.15-stable review patch. If anyone has any objections, please let me know.
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From: Milos Reljin milos_reljin@outlook.com
commit bd1bbab717608757cccbbe08b0d46e6c3ed0ced5 upstream.
In application note (AN13663) for TJA1120, on page 30, there's a figure with average PHY startup timing values following software reset. The time it takes for SMI to become operational after software reset ranges roughly from 500 us to 1500 us.
This commit adds 2000 us delay after MDIO write which triggers software reset. Without this delay, soft_reset function returns an error and prevents successful PHY init.
Cc: stable@vger.kernel.org Fixes: b050f2f15e04 ("phy: nxp-c45: add driver for tja1103") Signed-off-by: Milos Reljin milos_reljin@outlook.com Reviewed-by: Andrew Lunn andrew@lunn.ch Link: https://patch.msgid.link/AM8P250MB0124D258E5A71041AF2CC322E1E32@AM8P250MB012... Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/phy/nxp-c45-tja11xx.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/drivers/net/phy/nxp-c45-tja11xx.c +++ b/drivers/net/phy/nxp-c45-tja11xx.c @@ -717,6 +717,8 @@ static int nxp_c45_soft_reset(struct phy if (ret) return ret;
+ usleep_range(2000, 2050); + return phy_read_mmd_poll_timeout(phydev, MDIO_MMD_VEND1, VEND1_DEVICE_CONTROL, ret, !(ret & DEVICE_CONTROL_RESET), 20000,