From: dave graham Date: Tue, 10 Feb 2009 12:52:28 +0000 (+0000) Subject: e1000e: Serdes - attempt autoneg when link restored. X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=c9523379d6000f379a84b6b970efb8782c128071;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git e1000e: Serdes - attempt autoneg when link restored. This patch addresses an issue where we did not restart auto-negotiation on serdes links when the link partner was disabled and re-enabled. It includes reworking the serdes link detect mechanism to be a state machine for 82571 and 82572 parts only. Signed-off-by: dave graham Acked-by: Bruce Allan Signed-off-by: Jeff Kirsher Signed-off-by: David S. Miller --- diff --git a/drivers/net/e1000e/82571.c b/drivers/net/e1000e/82571.c index 25f6bc94e69b..565fd4e8f951 100644 --- a/drivers/net/e1000e/82571.c +++ b/drivers/net/e1000e/82571.c @@ -61,6 +61,7 @@ static s32 e1000_get_phy_id_82571(struct e1000_hw *hw); static s32 e1000_setup_copper_link_82571(struct e1000_hw *hw); static s32 e1000_setup_fiber_serdes_link_82571(struct e1000_hw *hw); +static s32 e1000_check_for_serdes_link_82571(struct e1000_hw *hw); static s32 e1000_write_nvm_eewr_82571(struct e1000_hw *hw, u16 offset, u16 words, u16 *data); static s32 e1000_fix_nvm_checksum_82571(struct e1000_hw *hw); @@ -250,7 +251,7 @@ static s32 e1000_init_mac_params_82571(struct e1000_adapter *adapter) case e1000_media_type_internal_serdes: func->setup_physical_interface = e1000_setup_fiber_serdes_link_82571; - func->check_for_link = e1000e_check_for_serdes_link; + func->check_for_link = e1000_check_for_serdes_link_82571; func->get_link_up_info = e1000e_get_speed_and_duplex_fiber_serdes; break; @@ -830,6 +831,10 @@ static s32 e1000_reset_hw_82571(struct e1000_hw *hw) hw->dev_spec.e82571.alt_mac_addr_is_present) e1000e_set_laa_state_82571(hw, true); + /* Reinitialize the 82571 serdes link state machine */ + if (hw->phy.media_type == e1000_media_type_internal_serdes) + hw->mac.serdes_link_state = e1000_serdes_link_down; + return 0; } @@ -1214,6 +1219,131 @@ static s32 e1000_setup_fiber_serdes_link_82571(struct e1000_hw *hw) return e1000e_setup_fiber_serdes_link(hw); } +/** + * e1000_check_for_serdes_link_82571 - Check for link (Serdes) + * @hw: pointer to the HW structure + * + * Checks for link up on the hardware. If link is not up and we have + * a signal, then we need to force link up. + **/ +s32 e1000_check_for_serdes_link_82571(struct e1000_hw *hw) +{ + struct e1000_mac_info *mac = &hw->mac; + u32 rxcw; + u32 ctrl; + u32 status; + s32 ret_val = 0; + + ctrl = er32(CTRL); + status = er32(STATUS); + rxcw = er32(RXCW); + + if ((rxcw & E1000_RXCW_SYNCH) && !(rxcw & E1000_RXCW_IV)) { + + /* Receiver is synchronized with no invalid bits. */ + switch (mac->serdes_link_state) { + case e1000_serdes_link_autoneg_complete: + if (!(status & E1000_STATUS_LU)) { + /* + * We have lost link, retry autoneg before + * reporting link failure + */ + mac->serdes_link_state = + e1000_serdes_link_autoneg_progress; + hw_dbg(hw, "AN_UP -> AN_PROG\n"); + } + break; + + case e1000_serdes_link_forced_up: + /* + * If we are receiving /C/ ordered sets, re-enable + * auto-negotiation in the TXCW register and disable + * forced link in the Device Control register in an + * attempt to auto-negotiate with our link partner. + */ + if (rxcw & E1000_RXCW_C) { + /* Enable autoneg, and unforce link up */ + ew32(TXCW, mac->txcw); + ew32(CTRL, + (ctrl & ~E1000_CTRL_SLU)); + mac->serdes_link_state = + e1000_serdes_link_autoneg_progress; + hw_dbg(hw, "FORCED_UP -> AN_PROG\n"); + } + break; + + case e1000_serdes_link_autoneg_progress: + /* + * If the LU bit is set in the STATUS register, + * autoneg has completed sucessfully. If not, + * try foring the link because the far end may be + * available but not capable of autonegotiation. + */ + if (status & E1000_STATUS_LU) { + mac->serdes_link_state = + e1000_serdes_link_autoneg_complete; + hw_dbg(hw, "AN_PROG -> AN_UP\n"); + } else { + /* + * Disable autoneg, force link up and + * full duplex, and change state to forced + */ + ew32(TXCW, + (mac->txcw & ~E1000_TXCW_ANE)); + ctrl |= (E1000_CTRL_SLU | E1000_CTRL_FD); + ew32(CTRL, ctrl); + + /* Configure Flow Control after link up. */ + ret_val = + e1000e_config_fc_after_link_up(hw); + if (ret_val) { + hw_dbg(hw, "Error config flow control\n"); + break; + } + mac->serdes_link_state = + e1000_serdes_link_forced_up; + hw_dbg(hw, "AN_PROG -> FORCED_UP\n"); + } + mac->serdes_has_link = true; + break; + + case e1000_serdes_link_down: + default: + /* The link was down but the receiver has now gained + * valid sync, so lets see if we can bring the link + * up. */ + ew32(TXCW, mac->txcw); + ew32(CTRL, + (ctrl & ~E1000_CTRL_SLU)); + mac->serdes_link_state = + e1000_serdes_link_autoneg_progress; + hw_dbg(hw, "DOWN -> AN_PROG\n"); + break; + } + } else { + if (!(rxcw & E1000_RXCW_SYNCH)) { + mac->serdes_has_link = false; + mac->serdes_link_state = e1000_serdes_link_down; + hw_dbg(hw, "ANYSTATE -> DOWN\n"); + } else { + /* + * We have sync, and can tolerate one + * invalid (IV) codeword before declaring + * link down, so reread to look again + */ + udelay(10); + rxcw = er32(RXCW); + if (rxcw & E1000_RXCW_IV) { + mac->serdes_link_state = e1000_serdes_link_down; + mac->serdes_has_link = false; + hw_dbg(hw, "ANYSTATE -> DOWN\n"); + } + } + } + + return ret_val; +} + /** * e1000_valid_led_default_82571 - Verify a valid default LED config * @hw: pointer to the HW structure diff --git a/drivers/net/e1000e/hw.h b/drivers/net/e1000e/hw.h index 2d4ce0492df0..5cb428c2811d 100644 --- a/drivers/net/e1000e/hw.h +++ b/drivers/net/e1000e/hw.h @@ -459,6 +459,13 @@ enum e1000_smart_speed { e1000_smart_speed_off }; +enum e1000_serdes_link_state { + e1000_serdes_link_down = 0, + e1000_serdes_link_autoneg_progress, + e1000_serdes_link_autoneg_complete, + e1000_serdes_link_forced_up +}; + /* Receive Descriptor */ struct e1000_rx_desc { __le64 buffer_addr; /* Address of the descriptor's data buffer */ @@ -787,6 +794,7 @@ struct e1000_mac_info { bool in_ifs_mode; bool serdes_has_link; bool tx_pkt_filtering; + enum e1000_serdes_link_state serdes_link_state; }; struct e1000_phy_info {