diff options
| author | Russell King <rmk+kernel@armlinux.org.uk> | 2019-10-18 10:31:07 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@armlinux.org.uk> | 2019-11-25 12:05:47 +0000 |
| commit | f44dd47242acae31ddf3499aecde162ff7d8c7c0 (patch) | |
| tree | da31e3bdc09042eebb9fb70aa687f5c5c3b18d82 /drivers/net/phy/sfp.c | |
| parent | 09bd742dbed2da21c306275e3516f55bd8cbdce1 (diff) | |
net: sfp: ensure TX_FAULT has deasserted before probing the PHY
TX_FAULT should be deasserted to indicate that the module has completed
its initialisation. This may include the on-board PHY, so wait until
the module has deasserted TX_FAULT before probing the PHY.
This means that we need an extra state to handle a TX_FAULT that
remains set for longer than t_init, since using the existing handling
state would bypass the PHY probe.
Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Diffstat (limited to 'drivers/net/phy/sfp.c')
| -rw-r--r-- | drivers/net/phy/sfp.c | 31 |
1 files changed, 25 insertions, 6 deletions
diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c index 72c6776c1ce6..cb0a35b1bb71 100644 --- a/drivers/net/phy/sfp.c +++ b/drivers/net/phy/sfp.c @@ -56,6 +56,7 @@ enum { SFP_S_DOWN = 0, SFP_S_WAIT, SFP_S_INIT, + SFP_S_INIT_TX_FAULT, SFP_S_WAIT_LOS, SFP_S_LINK_UP, SFP_S_TX_FAULT, @@ -113,6 +114,7 @@ static const char * const sm_state_strings[] = { [SFP_S_DOWN] = "down", [SFP_S_WAIT] = "wait", [SFP_S_INIT] = "init", + [SFP_S_INIT_TX_FAULT] = "init_tx_fault", [SFP_S_WAIT_LOS] = "wait_los", [SFP_S_LINK_UP] = "link_up", [SFP_S_TX_FAULT] = "tx_fault", @@ -1660,8 +1662,6 @@ static void sfp_sm_main(struct sfp *sfp, unsigned int event) if (event != SFP_E_TIMEOUT) break; - sfp_sm_probe_for_phy(sfp); - if (sfp->state & SFP_F_TX_FAULT) { /* Wait t_init before indicating that the link is up, * provided the current state indicates no TX_FAULT. If @@ -1683,10 +1683,29 @@ static void sfp_sm_main(struct sfp *sfp, unsigned int event) break; case SFP_S_INIT: - if (event == SFP_E_TIMEOUT && sfp->state & SFP_F_TX_FAULT) - sfp_sm_fault(sfp, SFP_S_TX_FAULT, true); - else if (event == SFP_E_TIMEOUT || event == SFP_E_TX_CLEAR) - init_done: sfp_sm_link_check_los(sfp); + if (event == SFP_E_TIMEOUT && sfp->state & SFP_F_TX_FAULT) { + /* TX_FAULT is still asserted after t_init, so assume + * there is a fault. + */ + sfp_sm_fault(sfp, SFP_S_INIT_TX_FAULT, + sfp->sm_retries == 5); + } else if (event == SFP_E_TIMEOUT || event == SFP_E_TX_CLEAR) { + init_done: /* TX_FAULT deasserted or we timed out with TX_FAULT + * clear. Probe for the PHY and check the LOS state. + */ + sfp_sm_probe_for_phy(sfp); + sfp_sm_link_check_los(sfp); + + /* Reset the fault retry count */ + sfp->sm_retries = 5; + } + break; + + case SFP_S_INIT_TX_FAULT: + if (event == SFP_E_TIMEOUT) { + sfp_module_tx_fault_reset(sfp); + sfp_sm_next(sfp, SFP_S_INIT, T_INIT_JIFFIES); + } break; case SFP_S_WAIT_LOS: |