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2024-12-19 9370bb92b2d16684ee45cf24e879c93c509162da 
 kernel/drivers/memstick/host/rtsx_usb_ms.c
....@@ -1,18 +1,7 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
12 /* Realtek USB Memstick Card Interface driver
23  *
34  * Copyright(c) 2009-2013 Realtek Semiconductor Corp. All rights reserved.
4
- *
5
- * This program is free software; you can redistribute it and/or modify it
6
- * under the terms of the GNU General Public License version 2
7
- * as published by the Free Software Foundation.
8
- *
9
- * This program is distributed in the hope that it will be useful, but
10
- * WITHOUT ANY WARRANTY; without even the implied warranty of
11
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12
- * General Public License for more details.
13
- *
14
- * You should have received a copy of the GNU General Public License along
15
- * with this program; if not, see <http://www.gnu.org/licenses/>.
165  *
176  * Author:
187  *   Roger Tseng <rogerable@realtek.com>
....@@ -40,15 +29,14 @@
4029 
4130 	struct mutex		host_mutex;
4231 	struct work_struct	handle_req;
43
-
44
-	struct task_struct	*detect_ms;
45
-	struct completion	detect_ms_exit;
32
+	struct delayed_work	poll_card;
4633 
4734 	u8			ssc_depth;
4835 	unsigned int		clock;
4936 	int			power_mode;
5037 	unsigned char           ifmode;
5138 	bool			eject;
39
+	bool			system_suspending;
5240 };
5341 
5442 static inline struct device *ms_dev(struct rtsx_usb_ms *host)
....@@ -545,7 +533,7 @@
545533 						host->req->error);
546534 			}
547535 		} while (!rc);
548
-		pm_runtime_put(ms_dev(host));
536
+		pm_runtime_put_sync(ms_dev(host));
549537 	}
550538 
551539 }
....@@ -585,14 +573,14 @@
585573 			break;
586574 
587575 		if (value == MEMSTICK_POWER_ON) {
588
-			pm_runtime_get_sync(ms_dev(host));
576
+			pm_runtime_get_noresume(ms_dev(host));
589577 			err = ms_power_on(host);
578
+			if (err)
579
+				pm_runtime_put_noidle(ms_dev(host));
590580 		} else if (value == MEMSTICK_POWER_OFF) {
591581 			err = ms_power_off(host);
592
-			if (host->msh->card)
582
+			if (!err)
593583 				pm_runtime_put_noidle(ms_dev(host));
594
-			else
595
-				pm_runtime_put(ms_dev(host));
596584 		} else
597585 			err = -EINVAL;
598586 		if (!err)
....@@ -638,11 +626,15 @@
638626 	}
639627 out:
640628 	mutex_unlock(&ucr->dev_mutex);
641
-	pm_runtime_put(ms_dev(host));
629
+	pm_runtime_put_sync(ms_dev(host));
642630 
643631 	/* power-on delay */
644
-	if (param == MEMSTICK_POWER && value == MEMSTICK_POWER_ON)
632
+	if (param == MEMSTICK_POWER && value == MEMSTICK_POWER_ON) {
645633 		usleep_range(10000, 12000);
634
+
635
+		if (!host->eject)
636
+			schedule_delayed_work(&host->poll_card, 100);
637
+	}
646638 
647639 	dev_dbg(ms_dev(host), "%s: return = %d\n", __func__, err);
648640 	return err;
....@@ -654,9 +646,24 @@
654646 	struct rtsx_usb_ms *host = dev_get_drvdata(dev);
655647 	struct memstick_host *msh = host->msh;
656648 
657
-	dev_dbg(ms_dev(host), "--> %s\n", __func__);
649
+	/* Since we use rtsx_usb's resume callback to runtime resume its
650
+	 * children to implement remote wakeup signaling, this causes
651
+	 * rtsx_usb_ms' runtime resume callback runs after its suspend
652
+	 * callback:
653
+	 * rtsx_usb_ms_suspend()
654
+	 * rtsx_usb_resume()
655
+	 *   -> rtsx_usb_ms_runtime_resume()
656
+	 *     -> memstick_detect_change()
657
+	 *
658
+	 * rtsx_usb_suspend()
659
+	 *
660
+	 * To avoid this, skip runtime resume/suspend if system suspend is
661
+	 * underway.
662
+	 */
658663 
664
+	host->system_suspending = true;
659665 	memstick_suspend_host(msh);
666
+
660667 	return 0;
661668 }
662669 
....@@ -665,58 +672,85 @@
665672 	struct rtsx_usb_ms *host = dev_get_drvdata(dev);
666673 	struct memstick_host *msh = host->msh;
667674 
668
-	dev_dbg(ms_dev(host), "--> %s\n", __func__);
669
-
670675 	memstick_resume_host(msh);
676
+	host->system_suspending = false;
677
+
671678 	return 0;
672679 }
673680 #endif /* CONFIG_PM_SLEEP */
674681 
675
-/*
676
- * Thread function of ms card slot detection. The thread starts right after
677
- * successful host addition. It stops while the driver removal function sets
678
- * host->eject true.
679
- */
680
-static int rtsx_usb_detect_ms_card(void *__host)
682
+#ifdef CONFIG_PM
683
+static int rtsx_usb_ms_runtime_suspend(struct device *dev)
681684 {
682
-	struct rtsx_usb_ms *host = (struct rtsx_usb_ms *)__host;
685
+	struct rtsx_usb_ms *host = dev_get_drvdata(dev);
686
+
687
+	if (host->system_suspending)
688
+		return 0;
689
+
690
+	if (host->msh->card || host->power_mode != MEMSTICK_POWER_OFF)
691
+		return -EAGAIN;
692
+
693
+	return 0;
694
+}
695
+
696
+static int rtsx_usb_ms_runtime_resume(struct device *dev)
697
+{
698
+	struct rtsx_usb_ms *host = dev_get_drvdata(dev);
699
+
700
+
701
+	if (host->system_suspending)
702
+		return 0;
703
+
704
+	memstick_detect_change(host->msh);
705
+
706
+	return 0;
707
+}
708
+#endif /* CONFIG_PM */
709
+
710
+static const struct dev_pm_ops rtsx_usb_ms_pm_ops = {
711
+	SET_SYSTEM_SLEEP_PM_OPS(rtsx_usb_ms_suspend, rtsx_usb_ms_resume)
712
+	SET_RUNTIME_PM_OPS(rtsx_usb_ms_runtime_suspend, rtsx_usb_ms_runtime_resume, NULL)
713
+};
714
+
715
+
716
+static void rtsx_usb_ms_poll_card(struct work_struct *work)
717
+{
718
+	struct rtsx_usb_ms *host = container_of(work, struct rtsx_usb_ms,
719
+			poll_card.work);
683720 	struct rtsx_ucr *ucr = host->ucr;
684
-	u8 val = 0;
685721 	int err;
722
+	u8 val;
686723 
687
-	for (;;) {
688
-		pm_runtime_get_sync(ms_dev(host));
689
-		mutex_lock(&ucr->dev_mutex);
724
+	if (host->eject || host->power_mode != MEMSTICK_POWER_ON)
725
+		return;
690726 
691
-		/* Check pending MS card changes */
692
-		err = rtsx_usb_read_register(ucr, CARD_INT_PEND, &val);
693
-		if (err) {
694
-			mutex_unlock(&ucr->dev_mutex);
695
-			goto poll_again;
696
-		}
727
+	pm_runtime_get_sync(ms_dev(host));
728
+	mutex_lock(&ucr->dev_mutex);
697729 
698
-		/* Clear the pending */
699
-		rtsx_usb_write_register(ucr, CARD_INT_PEND,
700
-				XD_INT | MS_INT | SD_INT,
701
-				XD_INT | MS_INT | SD_INT);
702
-
730
+	/* Check pending MS card changes */
731
+	err = rtsx_usb_read_register(ucr, CARD_INT_PEND, &val);
732
+	if (err) {
703733 		mutex_unlock(&ucr->dev_mutex);
704
-
705
-		if (val & MS_INT) {
706
-			dev_dbg(ms_dev(host), "MS slot change detected\n");
707
-			memstick_detect_change(host->msh);
708
-		}
709
-
710
-poll_again:
711
-		pm_runtime_put(ms_dev(host));
712
-		if (host->eject)
713
-			break;
714
-
715
-		schedule_timeout_idle(HZ);
734
+		goto poll_again;
716735 	}
717736 
718
-	complete(&host->detect_ms_exit);
719
-	return 0;
737
+	/* Clear the pending */
738
+	rtsx_usb_write_register(ucr, CARD_INT_PEND,
739
+			XD_INT | MS_INT | SD_INT,
740
+			XD_INT | MS_INT | SD_INT);
741
+
742
+	mutex_unlock(&ucr->dev_mutex);
743
+
744
+	if (val & MS_INT) {
745
+		dev_dbg(ms_dev(host), "MS slot change detected\n");
746
+		memstick_detect_change(host->msh);
747
+	}
748
+
749
+poll_again:
750
+	pm_runtime_put_sync(ms_dev(host));
751
+
752
+	if (!host->eject && host->power_mode == MEMSTICK_POWER_ON)
753
+		schedule_delayed_work(&host->poll_card, 100);
720754 }
721755 
722756 static int rtsx_usb_ms_drv_probe(struct platform_device *pdev)
....@@ -747,28 +781,26 @@
747781 	mutex_init(&host->host_mutex);
748782 	INIT_WORK(&host->handle_req, rtsx_usb_ms_handle_req);
749783 
750
-	init_completion(&host->detect_ms_exit);
751
-	host->detect_ms = kthread_create(rtsx_usb_detect_ms_card, host,
752
-			"rtsx_usb_ms_%d", pdev->id);
753
-	if (IS_ERR(host->detect_ms)) {
754
-		dev_dbg(&(pdev->dev),
755
-				"Unable to create polling thread.\n");
756
-		err = PTR_ERR(host->detect_ms);
757
-		goto err_out;
758
-	}
784
+	INIT_DELAYED_WORK(&host->poll_card, rtsx_usb_ms_poll_card);
759785 
760786 	msh->request = rtsx_usb_ms_request;
761787 	msh->set_param = rtsx_usb_ms_set_param;
762788 	msh->caps = MEMSTICK_CAP_PAR4;
763789 
764
-	pm_runtime_enable(&pdev->dev);
790
+	pm_runtime_get_noresume(ms_dev(host));
791
+	pm_runtime_set_active(ms_dev(host));
792
+	pm_runtime_enable(ms_dev(host));
793
+
765794 	err = memstick_add_host(msh);
766795 	if (err)
767796 		goto err_out;
768797 
769
-	wake_up_process(host->detect_ms);
798
+	pm_runtime_put(ms_dev(host));
799
+
770800 	return 0;
771801 err_out:
802
+	pm_runtime_disable(ms_dev(host));
803
+	pm_runtime_put_noidle(ms_dev(host));
772804 	memstick_free_host(msh);
773805 	return err;
774806 }
....@@ -776,16 +808,15 @@
776808 static int rtsx_usb_ms_drv_remove(struct platform_device *pdev)
777809 {
778810 	struct rtsx_usb_ms *host = platform_get_drvdata(pdev);
779
-	struct memstick_host *msh;
811
+	struct memstick_host *msh = host->msh;
780812 	int err;
781813 
782
-	msh = host->msh;
783814 	host->eject = true;
784815 	cancel_work_sync(&host->handle_req);
785816 
786817 	mutex_lock(&host->host_mutex);
787818 	if (host->req) {
788
-		dev_dbg(&(pdev->dev),
819
+		dev_dbg(ms_dev(host),
789820 			"%s: Controller removed during transfer\n",
790821 			dev_name(&msh->dev));
791822 		host->req->error = -ENOMEDIUM;
....@@ -797,27 +828,21 @@
797828 	}
798829 	mutex_unlock(&host->host_mutex);
799830 
800
-	wait_for_completion(&host->detect_ms_exit);
801
-	memstick_remove_host(msh);
802
-	memstick_free_host(msh);
803
-
804831 	/* Balance possible unbalanced usage count
805832 	 * e.g. unconditional module removal
806833 	 */
807834 	if (pm_runtime_active(ms_dev(host)))
808835 		pm_runtime_put(ms_dev(host));
809836 
810
-	pm_runtime_disable(&pdev->dev);
811
-	platform_set_drvdata(pdev, NULL);
812
-
813
-	dev_dbg(&(pdev->dev),
837
+	pm_runtime_disable(ms_dev(host));
838
+	memstick_remove_host(msh);
839
+	dev_dbg(ms_dev(host),
814840 		": Realtek USB Memstick controller has been removed\n");
841
+	memstick_free_host(msh);
842
+	platform_set_drvdata(pdev, NULL);
815843 
816844 	return 0;
817845 }
818
-
819
-static SIMPLE_DEV_PM_OPS(rtsx_usb_ms_pm_ops,
820
-		rtsx_usb_ms_suspend, rtsx_usb_ms_resume);
821846 
822847 static struct platform_device_id rtsx_usb_ms_ids[] = {
823848 	{