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> Signed-off-by: David S. Miller <davem@davemloft.net>
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@ -56,6 +56,7 @@ enum {
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SFP_S_DOWN = 0,
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SFP_S_WAIT,
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SFP_S_INIT,
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SFP_S_INIT_TX_FAULT,
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SFP_S_WAIT_LOS,
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SFP_S_LINK_UP,
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SFP_S_TX_FAULT,
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@ -113,6 +114,7 @@ static const char * const sm_state_strings[] = {
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[SFP_S_DOWN] = "down",
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[SFP_S_WAIT] = "wait",
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[SFP_S_INIT] = "init",
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[SFP_S_INIT_TX_FAULT] = "init_tx_fault",
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[SFP_S_WAIT_LOS] = "wait_los",
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[SFP_S_LINK_UP] = "link_up",
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[SFP_S_TX_FAULT] = "tx_fault",
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@ -1660,8 +1662,6 @@ static void sfp_sm_main(struct sfp *sfp, unsigned int event)
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if (event != SFP_E_TIMEOUT)
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break;
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sfp_sm_probe_for_phy(sfp);
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if (sfp->state & SFP_F_TX_FAULT) {
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/* Wait t_init before indicating that the link is up,
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* provided the current state indicates no TX_FAULT. If
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@ -1683,10 +1683,29 @@ static void sfp_sm_main(struct sfp *sfp, unsigned int event)
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break;
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case SFP_S_INIT:
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if (event == SFP_E_TIMEOUT && sfp->state & SFP_F_TX_FAULT)
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sfp_sm_fault(sfp, SFP_S_TX_FAULT, true);
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else if (event == SFP_E_TIMEOUT || event == SFP_E_TX_CLEAR)
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init_done: sfp_sm_link_check_los(sfp);
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if (event == SFP_E_TIMEOUT && sfp->state & SFP_F_TX_FAULT) {
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/* TX_FAULT is still asserted after t_init, so assume
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* there is a fault.
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*/
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sfp_sm_fault(sfp, SFP_S_INIT_TX_FAULT,
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sfp->sm_retries == 5);
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} else if (event == SFP_E_TIMEOUT || event == SFP_E_TX_CLEAR) {
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init_done: /* TX_FAULT deasserted or we timed out with TX_FAULT
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* clear. Probe for the PHY and check the LOS state.
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*/
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sfp_sm_probe_for_phy(sfp);
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sfp_sm_link_check_los(sfp);
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/* Reset the fault retry count */
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sfp->sm_retries = 5;
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}
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break;
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case SFP_S_INIT_TX_FAULT:
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if (event == SFP_E_TIMEOUT) {
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sfp_module_tx_fault_reset(sfp);
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sfp_sm_next(sfp, SFP_S_INIT, T_INIT_JIFFIES);
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}
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break;
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case SFP_S_WAIT_LOS:
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