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    Subject[PATCH 5.10 069/215] net: phy: realtek: add delay to fix RXC generation issue
    Date
    From: Joakim Zhang <qiangqing.zhang@nxp.com>

    [ 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@nxp.com>
    Signed-off-by: David S. Miller <davem@davemloft.net>
    Signed-off-by: Sasha Levin <sashal@kernel.org>
    ---
    drivers/net/phy/realtek.c | 15 ++++++++++++++-
    1 file changed, 14 insertions(+), 1 deletion(-)

    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,
    }, {
    --
    2.30.2


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