e1000e: Fix/cleanup PHY reset code for ICHx/PCHx

i) Fixes a bug where e1000_sw_lcd_config_ich8lan() was calling
e1000_lan_init_done_ich8lan() to poll the STATUS.LAN_INIT_DONE bit to
make sure the MAC had completed the PHY configuration.  However,
e1000_lan_init_done_ich8lan() had already been called in one of the two
places where PHY reset occurs for ICHx/PCHx parts, which caused the second
call to busy-wait for 150 msec because the LAN_INIT_DONE bit had already
been checked and cleared.

ii) Cleanup the two separate PHY reset code paths, i.e. the full-chip reset
in e1000_reset_hw_ich8lan() and the PHY-only reset in
e1000_phy_hw_reset_ich8lan().  There was duplicate code in both paths to be
performed post-reset that are now combined into one new function -
e1000_post_phy_reset_ich8lan().  This cleanup also included moving the
clearing of the PHY Reset Asserted bit in the STATUS register (now done for
all ICH/PCH parts) and the check for the indication from h/w that basic
configuration has completed back to where it previously was in
e1000_get_cfg_done_ich8lan().

iii) Corrected a few comments

Signed-off-by: Bruce Allan <bruce.w.allan@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 75 insertions, 74 deletions

diff --git a/drivers/net/e1000e/ich8lan.c b/drivers/net/e1000e/ich8lan.c
index 2b2cffc017be..10360fb596aa 100644
--- a/drivers/net/e1000e/ich8lan.c
+++ b/drivers/net/e1000e/ich8lan.c
@@ -850,9 +850,6 @@ static s32 e1000_sw_lcd_config_ich8lan(struct e1000_hw *hw)
         if (!(data & sw_cfg_mask))
                 goto out;
 
-        /* Wait for basic configuration completes before proceeding */
-        e1000_lan_init_done_ich8lan(hw);
-
         /*
          * Make sure HW does not configure LCD from PHY
          * extended configuration before SW configuration
@@ -1260,30 +1257,26 @@ static void e1000_lan_init_done_ich8lan(struct e1000_hw *hw)
 }
 
 /**
- *  e1000_phy_hw_reset_ich8lan - Performs a PHY reset
+ *  e1000_post_phy_reset_ich8lan - Perform steps required after a PHY reset
  *  @hw: pointer to the HW structure
- *
- *  Resets the PHY
- *  This is a function pointer entry point called by drivers
- *  or other shared routines.
  **/
-static s32 e1000_phy_hw_reset_ich8lan(struct e1000_hw *hw)
+static s32 e1000_post_phy_reset_ich8lan(struct e1000_hw *hw)
 {
         s32 ret_val = 0;
         u16 reg;
 
-        ret_val = e1000e_phy_hw_reset_generic(hw);
-        if (ret_val)
-                return ret_val;
-
-        /* Allow time for h/w to get to a quiescent state after reset */
-        mdelay(10);
+        if (e1000_check_reset_block(hw))
+                goto out;
 
         /* Perform any necessary post-reset workarounds */
-        if (hw->mac.type == e1000_pchlan) {
+        switch (hw->mac.type) {
+        case e1000_pchlan:
                 ret_val = e1000_hv_phy_workarounds_ich8lan(hw);
                 if (ret_val)
-                        return ret_val;
+                        goto out;
+                break;
+        default:
+                break;
         }
 
         /* Dummy read to clear the phy wakeup bit after lcd reset */
@@ -1296,11 +1289,32 @@ static s32 e1000_phy_hw_reset_ich8lan(struct e1000_hw *hw)
                 goto out;
 
         /* Configure the LCD with the OEM bits in NVM */
-        if (hw->mac.type == e1000_pchlan)
-                ret_val = e1000_oem_bits_config_ich8lan(hw, true);
+        ret_val = e1000_oem_bits_config_ich8lan(hw, true);
 
 out:
-        return 0;
+        return ret_val;
+}
+
+/**
+ *  e1000_phy_hw_reset_ich8lan - Performs a PHY reset
+ *  @hw: pointer to the HW structure
+ *
+ *  Resets the PHY
+ *  This is a function pointer entry point called by drivers
+ *  or other shared routines.
+ **/
+static s32 e1000_phy_hw_reset_ich8lan(struct e1000_hw *hw)
+{
+        s32 ret_val = 0;
+
+        ret_val = e1000e_phy_hw_reset_generic(hw);
+        if (ret_val)
+                goto out;
+
+        ret_val = e1000_post_phy_reset_ich8lan(hw);
+
+out:
+        return ret_val;
 }
 
 /**
@@ -2511,9 +2525,8 @@ static s32 e1000_reset_hw_ich8lan(struct e1000_hw *hw)
          * on the last TLP read/write transaction when MAC is reset.
          */
         ret_val = e1000e_disable_pcie_master(hw);
-        if (ret_val) {
+        if (ret_val)
                 e_dbg("PCI-E Master disable polling has failed.\n");
-        }
 
         e_dbg("Masking off all interrupts\n");
         ew32(IMC, 0xffffffff);
@@ -2552,14 +2565,8 @@ static s32 e1000_reset_hw_ich8lan(struct e1000_hw *hw)
         ctrl = er32(CTRL);
 
         if (!e1000_check_reset_block(hw)) {
-                /* Clear PHY Reset Asserted bit */
-                if (hw->mac.type >= e1000_pchlan) {
-                        u32 status = er32(STATUS);
-                        ew32(STATUS, status & ~E1000_STATUS_PHYRA);
-                }
-
                 /*
-                 * PHY HW reset requires MAC CORE reset at the same
+                 * Full-chip reset requires MAC and PHY reset at the same
                  * time to make sure the interface between MAC and the
                  * external PHY is reset.
                  */
@@ -2573,39 +2580,16 @@ static s32 e1000_reset_hw_ich8lan(struct e1000_hw *hw)
         if (!ret_val)
                 e1000_release_swflag_ich8lan(hw);
 
-        /* Perform any necessary post-reset workarounds */
-        if (hw->mac.type == e1000_pchlan)
-                ret_val = e1000_hv_phy_workarounds_ich8lan(hw);
-
-        if (ctrl & E1000_CTRL_PHY_RST)
+        if (ctrl & E1000_CTRL_PHY_RST) {
                 ret_val = hw->phy.ops.get_cfg_done(hw);
+                if (ret_val)
+                        goto out;
 
-        if (hw->mac.type >= e1000_ich10lan) {
-                e1000_lan_init_done_ich8lan(hw);
-        } else {
-                ret_val = e1000e_get_auto_rd_done(hw);
-                if (ret_val) {
-                        /*
-                         * When auto config read does not complete, do not
-                         * return with an error. This can happen in situations
-                         * where there is no eeprom and prevents getting link.
-                         */
-                        e_dbg("Auto Read Done did not complete\n");
-                }
-        }
-        /* Dummy read to clear the phy wakeup bit after lcd reset */
-        if (hw->mac.type == e1000_pchlan)
-                e1e_rphy(hw, BM_WUC, &reg);
-
-        ret_val = e1000_sw_lcd_config_ich8lan(hw);
-        if (ret_val)
-                goto out;
-
-        if (hw->mac.type == e1000_pchlan) {
-                ret_val = e1000_oem_bits_config_ich8lan(hw, true);
+                ret_val = e1000_post_phy_reset_ich8lan(hw);
                 if (ret_val)
                         goto out;
         }
+
         /*
          * For PCH, this write will make sure that any noise
          * will be detected as a CRC error and be dropped rather than show up
@@ -3291,33 +3275,50 @@ static s32 e1000_led_off_pchlan(struct e1000_hw *hw)
 }
 
 /**
- *  e1000_get_cfg_done_ich8lan - Read config done bit
+ *  e1000_get_cfg_done_ich8lan - Read config done bit after Full or PHY reset
  *  @hw: pointer to the HW structure
  *
- *  Read the management control register for the config done bit for
- *  completion status.  NOTE: silicon which is EEPROM-less will fail trying
- *  to read the config done bit, so an error is *ONLY* logged and returns
- *  0.  If we were to return with error, EEPROM-less silicon
- *  would not be able to be reset or change link.
+ *  Read appropriate register for the config done bit for completion status
+ *  and configure the PHY through s/w for EEPROM-less parts.
+ *
+ *  NOTE: some silicon which is EEPROM-less will fail trying to read the
+ *  config done bit, so only an error is logged and continues.  If we were
+ *  to return with error, EEPROM-less silicon would not be able to be reset
+ *  or change link.
  **/
 static s32 e1000_get_cfg_done_ich8lan(struct e1000_hw *hw)
 {
+        s32 ret_val = 0;
         u32 bank = 0;
+        u32 status;
 
-        if (hw->mac.type >= e1000_pchlan) {
-                u32 status = er32(STATUS);
+        e1000e_get_cfg_done(hw);
 
-                if (status & E1000_STATUS_PHYRA)
-                        ew32(STATUS, status & ~E1000_STATUS_PHYRA);
-                else
-                        e_dbg("PHY Reset Asserted not set - needs delay\n");
+        /* Wait for indication from h/w that it has completed basic config */
+        if (hw->mac.type >= e1000_ich10lan) {
+                e1000_lan_init_done_ich8lan(hw);
+        } else {
+                ret_val = e1000e_get_auto_rd_done(hw);
+                if (ret_val) {
+                        /*
+                         * When auto config read does not complete, do not
+                         * return with an error. This can happen in situations
+                         * where there is no eeprom and prevents getting link.
+                         */
+                        e_dbg("Auto Read Done did not complete\n");
+                        ret_val = 0;
+                }
         }
 
-        e1000e_get_cfg_done(hw);
+        /* Clear PHY Reset Asserted bit */
+        status = er32(STATUS);
+        if (status & E1000_STATUS_PHYRA)
+                ew32(STATUS, status & ~E1000_STATUS_PHYRA);
+        else
+                e_dbg("PHY Reset Asserted not set - needs delay\n");
 
         /* If EEPROM is not marked present, init the IGP 3 PHY manually */
-        if ((hw->mac.type != e1000_ich10lan) &&
-            (hw->mac.type != e1000_pchlan)) {
+        if (hw->mac.type <= e1000_ich9lan) {
                 if (((er32(EECD) & E1000_EECD_PRES) == 0) &&
                     (hw->phy.type == e1000_phy_igp_3)) {
                         e1000e_phy_init_script_igp3(hw);
@@ -3326,11 +3327,11 @@ static s32 e1000_get_cfg_done_ich8lan(struct e1000_hw *hw)
                 if (e1000_valid_nvm_bank_detect_ich8lan(hw, &bank)) {
                         /* Maybe we should do a basic PHY config */
                         e_dbg("EEPROM not present\n");
-                        return -E1000_ERR_CONFIG;
+                        ret_val = -E1000_ERR_CONFIG;
                 }
         }
 
-        return 0;
+        return ret_val;
 }
 
 /**