add wifi6 8852be driver

hc

2024-12-19 9370bb92b2d16684ee45cf24e879c93c509162da

 kernel/drivers/scsi/ufs/ufshcd.c
..
..
@@ -731,16 +731,6 @@
731
731
 }
732
732
 
733
733
 /**
734
- * ufshcd_outstanding_req_clear - Clear a bit in outstanding request field
735
- * @hba: per adapter instance
736
- * @tag: position of the bit to be cleared
737
- */
738
-static inline void ufshcd_outstanding_req_clear(struct ufs_hba *hba, int tag)
739
-{
740
-	clear_bit(tag, &hba->outstanding_reqs);
741
-}
742
-
743
-/**
744
734
  * ufshcd_get_lists_status - Check UCRDY, UTRLRDY and UTMRLRDY
745
735
  * @reg: Register value of host controller status
746
736
  *
..
..
@@ -2882,37 +2872,76 @@
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2872
 static int ufshcd_wait_for_dev_cmd(struct ufs_hba *hba,
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2873
 		struct ufshcd_lrb *lrbp, int max_timeout)
2884
2874
 {
2885
-	int err = 0;
2886
-	unsigned long time_left;
2875
+	unsigned long time_left = msecs_to_jiffies(max_timeout);
2887
2876
 	unsigned long flags;
2877
+	bool pending;
2878
+	int err;
2888
2879
 
2880
+retry:
2889
2881
 	time_left = wait_for_completion_timeout(hba->dev_cmd.complete,
2890
-			msecs_to_jiffies(max_timeout));
2882
+					time_left);
2891
2883
 
2892
2884
 	/* Make sure descriptors are ready before ringing the doorbell */
2893
2885
 	wmb();
2894
-	spin_lock_irqsave(hba->host->host_lock, flags);
2895
-	hba->dev_cmd.complete = NULL;
2896
2886
 	if (likely(time_left)) {
2887
+		/*
2888
+		* The completion handler called complete() and the caller of
2889
+		* this function still owns the @lrbp tag so the code below does
2890
+		* not trigger any race conditions.
2891
+		*/
2892
+		hba->dev_cmd.complete = NULL;
2897
2893
 		err = ufshcd_get_tr_ocs(lrbp);
2898
2894
 		if (!err)
2899
2895
 			err = ufshcd_dev_cmd_completion(hba, lrbp);
2900
-	}
2901
-	spin_unlock_irqrestore(hba->host->host_lock, flags);
2902
-
2903
-	if (!time_left) {
2896
+	} else {
2904
2897
 		err = -ETIMEDOUT;
2905
2898
 		dev_dbg(hba->dev, "%s: dev_cmd request timedout, tag %d\n",
2906
2899
 			__func__, lrbp->task_tag);
2907
-		if (!ufshcd_clear_cmd(hba, lrbp->task_tag))
2900
+		if (ufshcd_clear_cmd(hba, lrbp->task_tag) == 0) {
2908
2901
 			/* successfully cleared the command, retry if needed */
2909
2902
 			err = -EAGAIN;
2910
-		/*
2911
-		 * in case of an error, after clearing the doorbell,
2912
-		 * we also need to clear the outstanding_request
2913
-		 * field in hba
2914
-		 */
2915
-		ufshcd_outstanding_req_clear(hba, lrbp->task_tag);
2903
+			/*
2904
+			* Since clearing the command succeeded we also need to
2905
+			* clear the task tag bit from the outstanding_reqs
2906
+			* variable.
2907
+			*/
2908
+			spin_lock_irqsave(hba->host->host_lock, flags);
2909
+			pending = test_bit(lrbp->task_tag,
2910
+						&hba->outstanding_reqs);
2911
+			if (pending) {
2912
+					hba->dev_cmd.complete = NULL;
2913
+					__clear_bit(lrbp->task_tag,
2914
+							&hba->outstanding_reqs);
2915
+			}
2916
+			spin_unlock_irqrestore(hba->host->host_lock, flags);
2917
+
2918
+			if (!pending) {
2919
+				/*
2920
+				* The completion handler ran while we tried to
2921
+				* clear the command.
2922
+				*/
2923
+				time_left = 1;
2924
+				goto retry;
2925
+			}
2926
+		} else {
2927
+			dev_err(hba->dev, "%s: failed to clear tag %d\n",
2928
+				__func__, lrbp->task_tag);
2929
+			spin_lock_irqsave(hba->host->host_lock, flags);
2930
+			pending = test_bit(lrbp->task_tag,
2931
+					   &hba->outstanding_reqs);
2932
+			if (pending)
2933
+				hba->dev_cmd.complete = NULL;
2934
+			spin_unlock_irqrestore(hba->host->host_lock, flags);
2935
+
2936
+			if (!pending) {
2937
+				/*
2938
+				 * The completion handler ran while we tried to
2939
+				 * clear the command.
2940
+				 */
2941
+				time_left = 1;
2942
+				goto retry;
2943
+			}
2944
+		}
2916
2945
 	}
2917
2946
 
2918
2947
 	return err;
..
..
@@ -9485,5 +9514,6 @@
9485
9514
 MODULE_AUTHOR("Santosh Yaragnavi <santosh.sy@samsung.com>");
9486
9515
 MODULE_AUTHOR("Vinayak Holikatti <h.vinayak@samsung.com>");
9487
9516
 MODULE_DESCRIPTION("Generic UFS host controller driver Core");
9517
+MODULE_SOFTDEP("pre: governor_simpleondemand");
9488
9518
 MODULE_LICENSE("GPL");
9489
9519
 MODULE_VERSION(UFSHCD_DRIVER_VERSION);