This is a note to let you know that I've just added the patch titled net: phy: realtek: add delay to fix RXC generation issue to the 5.10-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: net-phy-realtek-add-delay-to-fix-rxc-generation-issu.patch and it can be found in the queue-5.10 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit cc34b172d297f13f2329a4a05dc323c683ab9955 Author: Joakim Zhang <qiangqing.zhang@xxxxxxx> Date: Tue Jun 8 11:15:35 2021 +0800 net: phy: realtek: add delay to fix RXC generation issue [ Upstream commit 6813cc8cfdaf401476e1a007cec8ae338cefa573 ] PHY will delay about 11.5ms to generate RXC clock when switching from power down to normal operation. Read/write registers would also cause RXC become unstable and stop for a while during this process. Realtek engineer suggests 15ms or more delay can workaround this issue. Signed-off-by: Joakim Zhang <qiangqing.zhang@xxxxxxx> Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/net/phy/realtek.c b/drivers/net/phy/realtek.c index 575580d3ffe0..b4879306bb8a 100644 --- a/drivers/net/phy/realtek.c +++ b/drivers/net/phy/realtek.c @@ -246,6 +246,19 @@ static int rtl8211f_config_init(struct phy_device *phydev) return 0; } +static int rtl821x_resume(struct phy_device *phydev) +{ + int ret; + + ret = genphy_resume(phydev); + if (ret < 0) + return ret; + + msleep(20); + + return 0; +} + static int rtl8211e_config_init(struct phy_device *phydev) { int ret = 0, oldpage; @@ -624,7 +637,7 @@ static struct phy_driver realtek_drvs[] = { .ack_interrupt = &rtl8211f_ack_interrupt, .config_intr = &rtl8211f_config_intr, .suspend = genphy_suspend, - .resume = genphy_resume, + .resume = rtl821x_resume, .read_page = rtl821x_read_page, .write_page = rtl821x_write_page, }, {