i40e: set max limit for access polling

Don't bother trying to set a smaller timeout on the polling,
just simplify the code and always use the max limit.  Also,
rename a variable for clarity and fix a comment.

Change-ID: I0300c3562ccc4fd5fa3088f8ae52db0c1eb33af5
Signed-off-by: NShannon Nelson <shannon.nelson@intel.com>
Acked-by: NMichal Kosiarz <michal.kosiarz@intel.com>
Tested-by: NJim Young <jamesx.m.young@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/i40e/i40e_nvm.c

@@ -80,45 +80,40 @@ i40e_status i40e_acquire_nvm(struct i40e_hw *hw,
 {
 	i40e_status ret_code = 0;
 	u64 gtime, timeout;
-	u64 time = 0;
+	u64 time_left = 0;
 
 	if (hw->nvm.blank_nvm_mode)
 		goto i40e_i40e_acquire_nvm_exit;
 
 	ret_code = i40e_aq_request_resource(hw, I40E_NVM_RESOURCE_ID, access,
-					    0, &time, NULL);
+					    0, &time_left, NULL);
 	/* Reading the Global Device Timer */
 	gtime = rd32(hw, I40E_GLVFGEN_TIMER);
 
 	/* Store the timeout */
-	hw->nvm.hw_semaphore_timeout = I40E_MS_TO_GTIME(time) + gtime;
+	hw->nvm.hw_semaphore_timeout = I40E_MS_TO_GTIME(time_left) + gtime;
 
 	if (ret_code) {
-		/* Set the polling timeout */
-		if (time > I40E_MAX_NVM_TIMEOUT)
-			timeout = I40E_MS_TO_GTIME(I40E_MAX_NVM_TIMEOUT)
-				  + gtime;
-		else
-			timeout = hw->nvm.hw_semaphore_timeout;
 		/* Poll until the current NVM owner timeouts */
+		timeout = I40E_MS_TO_GTIME(I40E_MAX_NVM_TIMEOUT) + gtime;
 		while (gtime < timeout) {
 			usleep_range(10000, 20000);
+			gtime = rd32(hw, I40E_GLVFGEN_TIMER);
 			ret_code = i40e_aq_request_resource(hw,
 							I40E_NVM_RESOURCE_ID,
-							access, 0, &time,
+							access, 0, &time_left,
 							NULL);
 			if (!ret_code) {
 				hw->nvm.hw_semaphore_timeout =
-						I40E_MS_TO_GTIME(time) + gtime;
+					    I40E_MS_TO_GTIME(time_left) + gtime;
 				break;
 			}
-			gtime = rd32(hw, I40E_GLVFGEN_TIMER);
 		}
 		if (ret_code) {
 			hw->nvm.hw_semaphore_timeout = 0;
 			i40e_debug(hw, I40E_DEBUG_NVM,
 				   "NVM acquire timed out, wait %llu ms before trying again.\n",
-				   time);
+				   time_left);
 		}
 	}
 

drivers/net/ethernet/intel/i40e/i40e_type.h

@@ -261,7 +261,7 @@ enum i40e_aq_resource_access_type {
 };
 
 struct i40e_nvm_info {
-	u64 hw_semaphore_timeout; /* 2usec global time (GTIME resolution) */
+	u64 hw_semaphore_timeout; /* usec global time (GTIME resolution) */
 	u32 timeout;              /* [ms] */
 	u16 sr_size;              /* Shadow RAM size in words */
 	bool blank_nvm_mode;      /* is NVM empty (no FW present)*/

drivers/net/ethernet/intel/i40evf/i40e_type.h

@@ -260,7 +260,7 @@ enum i40e_aq_resource_access_type {
 };
 
 struct i40e_nvm_info {
-	u64 hw_semaphore_timeout; /* 2usec global time (GTIME resolution) */
+	u64 hw_semaphore_timeout; /* usec global time (GTIME resolution) */
 	u32 timeout;              /* [ms] */
 	u16 sr_size;              /* Shadow RAM size in words */
 	bool blank_nvm_mode;      /* is NVM empty (no FW present)*/