4.9-stable review patch. If anyone has any objections, please let me know.
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From: Heiner Kallweit hkallweit1@gmail.com
[ Upstream commit 3148dedfe79e422f448a10250d3e2cdf8b7ee617 ]
Since commit a92a08499b1f "r8169: improve runtime pm in general and suspend unused ports" interfaces w/o link are runtime-suspended after 10s. On systems where drivers take longer to load this can lead to the situation that the interface is runtime-suspended already when it's initially brought up. This shouldn't be a problem because rtl_open() resumes MAC/PHY. However with at least one chip version the interface doesn't properly come up, as reported here: https://bugzilla.kernel.org/show_bug.cgi?id=199549
The vendor driver uses a delay to give certain chip versions some time to resume before starting the PHY configuration. So let's do the same. I don't know which chip versions may be affected, therefore apply this delay always.
This patch was reported to fix the issue for RTL8168h. I was able to reproduce the issue on an Asus H310I-Plus which also uses a RTL8168h. Also in my case the patch fixed the issue.
Reported-by: Slava Kardakov ojab@ojab.ru Tested-by: Slava Kardakov ojab@ojab.ru Signed-off-by: Heiner Kallweit hkallweit1@gmail.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/ethernet/realtek/r8169.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/drivers/net/ethernet/realtek/r8169.c +++ b/drivers/net/ethernet/realtek/r8169.c @@ -4861,6 +4861,9 @@ static void rtl_pll_power_down(struct rt static void rtl_pll_power_up(struct rtl8169_private *tp) { rtl_generic_op(tp, tp->pll_power_ops.up); + + /* give MAC/PHY some time to resume */ + msleep(20); }
static void rtl_init_pll_power_ops(struct rtl8169_private *tp)