ixgbe: cleanup logic related to HW semaphores

This change cleans up much of the logic related to the hardware semaphores
on the adapters. There were a number of issues with timings that needed to
be addressed.

Signed-off-by: Emil Tantilov <emil.s.tantilov@intel.com>
Tested-by: Stephen Ko <stephen.s.ko@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

diff --git a/drivers/net/ixgbe/ixgbe_common.c b/drivers/net/ixgbe/ixgbe_common.c
index ebbda7d..345c32e 100644 (file)
--- a/drivers/net/ixgbe/ixgbe_common.c
+++ b/drivers/net/ixgbe/ixgbe_common.c
@@ -603,7 +603,6 @@ s32 ixgbe_write_eeprom_generic(struct ixgbe_hw *hw, u16 offset, u16 data)
                ixgbe_shift_out_eeprom_bits(hw, data, 16);
                ixgbe_standby_eeprom(hw);
 
-               msleep(hw->eeprom.semaphore_delay);
                /* Done with writing - release the EEPROM */
                ixgbe_release_eeprom(hw);
        }
@@ -747,7 +746,7 @@ s32 ixgbe_poll_eerd_eewr_done(struct ixgbe_hw *hw, u32 ee_reg)
 static s32 ixgbe_acquire_eeprom(struct ixgbe_hw *hw)
 {
        s32 status = 0;
-       u32 eec = 0;
+       u32 eec;
        u32 i;
 
        if (ixgbe_acquire_swfw_sync(hw, IXGBE_GSSR_EEP_SM) != 0)
@@ -776,15 +775,15 @@ static s32 ixgbe_acquire_eeprom(struct ixgbe_hw *hw)
                        ixgbe_release_swfw_sync(hw, IXGBE_GSSR_EEP_SM);
                        status = IXGBE_ERR_EEPROM;
                }
-       }
 
-       /* Setup EEPROM for Read/Write */
-       if (status == 0) {
-               /* Clear CS and SK */
-               eec &= ~(IXGBE_EEC_CS | IXGBE_EEC_SK);
-               IXGBE_WRITE_REG(hw, IXGBE_EEC, eec);
-               IXGBE_WRITE_FLUSH(hw);
-               udelay(1);
+               /* Setup EEPROM for Read/Write */
+               if (status == 0) {
+                       /* Clear CS and SK */
+                       eec &= ~(IXGBE_EEC_CS | IXGBE_EEC_SK);
+                       IXGBE_WRITE_REG(hw, IXGBE_EEC, eec);
+                       IXGBE_WRITE_FLUSH(hw);
+                       udelay(1);
+               }
        }
        return status;
 }
@@ -798,13 +797,10 @@ static s32 ixgbe_acquire_eeprom(struct ixgbe_hw *hw)
 static s32 ixgbe_get_eeprom_semaphore(struct ixgbe_hw *hw)
 {
        s32 status = IXGBE_ERR_EEPROM;
-       u32 timeout;
+       u32 timeout = 2000;
        u32 i;
        u32 swsm;
 
-       /* Set timeout value based on size of EEPROM */
-       timeout = hw->eeprom.word_size + 1;
-
        /* Get SMBI software semaphore between device drivers first */
        for (i = 0; i < timeout; i++) {
                /*
@@ -816,7 +812,7 @@ static s32 ixgbe_get_eeprom_semaphore(struct ixgbe_hw *hw)
                        status = 0;
                        break;
                }
-               msleep(1);
+               udelay(50);
        }
 
        /* Now get the semaphore between SW/FW through the SWESMBI bit */
@@ -844,11 +840,14 @@ static s32 ixgbe_get_eeprom_semaphore(struct ixgbe_hw *hw)
                 * was not granted because we don't have access to the EEPROM
                 */
                if (i >= timeout) {
-                       hw_dbg(hw, "Driver can't access the Eeprom - Semaphore "
+                       hw_dbg(hw, "SWESMBI Software EEPROM semaphore "
                               "not granted.\n");
                        ixgbe_release_eeprom_semaphore(hw);
                        status = IXGBE_ERR_EEPROM;
                }
+       } else {
+               hw_dbg(hw, "Software semaphore SMBI between device drivers "
+                      "not granted.\n");
        }
 
        return status;
@@ -1081,10 +1080,13 @@ static void ixgbe_release_eeprom(struct ixgbe_hw *hw)
        IXGBE_WRITE_REG(hw, IXGBE_EEC, eec);
 
        ixgbe_release_swfw_sync(hw, IXGBE_GSSR_EEP_SM);
+
+       /* Delay before attempt to obtain semaphore again to allow FW access */
+       msleep(hw->eeprom.semaphore_delay);
 }
 
 /**
- *  ixgbe_calc_eeprom_checksum - Calculates and returns the checksum
+ *  ixgbe_calc_eeprom_checksum_generic - Calculates and returns the checksum
  *  @hw: pointer to hardware structure
  **/
 u16 ixgbe_calc_eeprom_checksum_generic(struct ixgbe_hw *hw)
@@ -2206,6 +2208,10 @@ s32 ixgbe_acquire_swfw_sync(struct ixgbe_hw *hw, u16 mask)
        s32 timeout = 200;
 
        while (timeout) {
+               /*
+                * SW EEPROM semaphore bit is used for access to all
+                * SW_FW_SYNC/GSSR bits (not just EEPROM)
+                */
                if (ixgbe_get_eeprom_semaphore(hw))
                        return IXGBE_ERR_SWFW_SYNC;
 
@@ -2223,7 +2229,7 @@ s32 ixgbe_acquire_swfw_sync(struct ixgbe_hw *hw, u16 mask)
        }
 
        if (!timeout) {
-               hw_dbg(hw, "Driver can't access resource, GSSR timeout.\n");
+               hw_dbg(hw, "Driver can't access resource, SW_FW_SYNC timeout.\n");
                return IXGBE_ERR_SWFW_SYNC;
        }