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| author | Russell King (Oracle) <rmk+kernel@armlinux.org.uk> | 2024-03-26 14:32:07 +0100 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2024-03-28 19:21:33 -0700 |
| commit | 21d9ba5bc5516e1d8a90c4a26de90855a1e4fb59 (patch) | |
| tree | e2d38ac6a119dc80fb72acb6d223983bbd899fbe /include/linux/phy.h | |
| parent | af352c3b666e2ab74be5db9f168960d8ad48b538 (diff) | |
| download | linux-21d9ba5bc5516e1d8a90c4a26de90855a1e4fb59.tar.gz linux-21d9ba5bc5516e1d8a90c4a26de90855a1e4fb59.tar.bz2 linux-21d9ba5bc5516e1d8a90c4a26de90855a1e4fb59.zip | |
net: phylink: add PHY_F_RXC_ALWAYS_ON to PHY dev flags
Some MAC controllers (e.g. stmmac) require their connected PHY to
continuously provide a receive clock signal. This can cause issues in two
cases:
1. The clock signal hasn't been started yet by the time the MAC driver
initializes its hardware. This can make the initialization fail, as in
the case of the rzn1 GMAC1 driver.
2. The clock signal is cut during a power saving event. By the time the
MAC is brought back up, the clock signal is still not active since
phylink_start hasn't been called yet. This brings us back to case 1.
If a PHY driver reads this flag, it should ensure that the receive clock
signal is started as soon as possible, and that it isn't brought down when
the PHY goes into suspend.
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
[rgantois: commit log]
Signed-off-by: Romain Gantois <romain.gantois@bootlin.com>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Link: https://lore.kernel.org/r/20240326-rxc_bugfix-v6-1-24a74e5c761f@bootlin.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Diffstat (limited to 'include/linux/phy.h')
| -rw-r--r-- | include/linux/phy.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/phy.h b/include/linux/phy.h index 3f68b8239bb1..e6e83304558e 100644 --- a/include/linux/phy.h +++ b/include/linux/phy.h @@ -778,6 +778,7 @@ struct phy_device { /* Generic phy_device::dev_flags */ #define PHY_F_NO_IRQ 0x80000000 +#define PHY_F_RXC_ALWAYS_ON 0x40000000 static inline struct phy_device *to_phy_device(const struct device *dev) { |