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net: sfp: ensure TX_FAULT has deasserted before probing the PHY

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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>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Russell King 2019-11-10 14:07:09 +00:00 committed by David S. Miller
parent 63ec1c7c3f
commit d23751a094
1 changed files with 25 additions and 6 deletions
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31
drivers/net/phy/sfp.c
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@ -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: