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From: Artur Petrosyan <Arthur.Petrosyan@synopsys.com>
To: Felipe Balbi <balbi@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Minas Harutyunyan <Minas.Harutyunyan@synopsys.com>,
	linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: John Youn <John.Youn@synopsys.com>,
	Artur Petrosyan <Arthur.Petrosyan@synopsys.com>
Subject: [PATCH v3 14/14] usb: dwc2: Add exit partial power down before removing driver
Date: Thu, 08 Apr 2021 13:46:14 +0400
Message-ID: <20210408094615.8AE35A0094@mailhost.synopsys.com> (raw)
In-Reply-To: <cover.1617782102.git.Arthur.Petrosyan@synopsys.com>

When dwc2 core is in partial power down mode
loading driver again causes driver fail. Because in
that mode registers are not accessible.

Added a flow of exiting the partial power down mode
to avoid the driver reload failure.

Signed-off-by: Artur Petrosyan <Arthur.Petrosyan@synopsys.com>
---
 Changes in v3:
 - None
 Changes in v2:
 - None

 drivers/usb/dwc2/platform.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c
index 5f18acac7406..b28b8cd45799 100644
--- a/drivers/usb/dwc2/platform.c
+++ b/drivers/usb/dwc2/platform.c
@@ -316,6 +316,15 @@ static int dwc2_lowlevel_hw_init(struct dwc2_hsotg *hsotg)
 static int dwc2_driver_remove(struct platform_device *dev)
 {
 	struct dwc2_hsotg *hsotg = platform_get_drvdata(dev);
+	int ret = 0;
+
+	/* Exit Partial Power Down when driver is removed. */
+	if (hsotg->in_ppd) {
+		ret = dwc2_exit_partial_power_down(hsotg, 0, true);
+		if (ret)
+			dev_err(hsotg->dev,
+				"exit partial_power_down failed\n");
+	}
 
 	dwc2_debugfs_exit(hsotg);
 	if (hsotg->hcd_enabled)
@@ -334,7 +343,7 @@ static int dwc2_driver_remove(struct platform_device *dev)
 	reset_control_assert(hsotg->reset);
 	reset_control_assert(hsotg->reset_ecc);
 
-	return 0;
+	return ret;
 }
 
 /**
-- 
2.25.1


  parent reply index

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-07 10:00 [PATCH 00/14] usb: dwc2: Fix Partial Power down issues Artur Petrosyan
2021-04-07 10:08 ` [PATCH 13/14] usb: dwc2: Fix partial power down exiting by system resume Artur Petrosyan
2021-04-08  5:57 ` [PATCH 00/14] usb: dwc2: Fix Partial Power down issues Artur Petrosyan
2021-04-08  6:09   ` Greg Kroah-Hartman
2021-04-08  7:28 ` [PATCH v2 " Artur Petrosyan
2021-04-08  9:17   ` Artur Petrosyan
2021-04-08 10:09     ` Artur Petrosyan
2021-04-08 11:00       ` Greg Kroah-Hartman
2021-04-08  7:30 ` [PATCH v2 13/14] usb: dwc2: Fix partial power down exiting by system resume Artur Petrosyan
2021-04-08  9:44 ` [PATCH v3 00/14] usb: dwc2: Fix Partial Power down issues Artur Petrosyan
2021-04-08  9:44 ` [PATCH v3 01/14] usb: dwc2: Add device partial power down functions Artur Petrosyan
2021-04-08  9:44 ` [PATCH v3 02/14] usb: dwc2: Add host " Artur Petrosyan
2021-04-08  9:44 ` [PATCH v3 03/14] usb: dwc2: Update enter and exit " Artur Petrosyan
2021-04-08  9:44 ` [PATCH v3 04/14] usb: dwc2: Add partial power down exit flow in wakeup intr Artur Petrosyan
2021-04-08  9:45 ` [PATCH v3 05/14] usb: dwc2: Update port suspend/resume function definitions Artur Petrosyan
2021-04-08 13:39   ` Minas Harutyunyan
2021-04-08  9:45 ` [PATCH v3 06/14] usb: dwc2: Add enter partial power down when port is suspended Artur Petrosyan
2021-04-08 13:39   ` Minas Harutyunyan
2021-04-08  9:45 ` [PATCH v3 07/14] usb: dwc2: Add exit partial power down when port is resumed Artur Petrosyan
2021-04-08 13:39   ` Minas Harutyunyan
2021-04-08  9:45 ` [PATCH v3 08/14] usb: dwc2: Add exit partial power down when port reset is asserted Artur Petrosyan
2021-04-08 13:39   ` Minas Harutyunyan
2021-04-08  9:45 ` [PATCH v3 09/14] usb: dwc2: Add part. power down exit from dwc2_conn_id_status_change() Artur Petrosyan
2021-04-08  9:45 ` [PATCH v3 10/14] usb: dwc2: Allow exit partial power down in urb enqueue Artur Petrosyan
2021-04-08 13:40   ` Minas Harutyunyan
2021-04-08  9:45 ` [PATCH v3 11/14] usb: dwc2: Fix session request interrupt handler Artur Petrosyan
2021-04-08  9:45 ` [PATCH v3 12/14] usb: dwc2: Update partial power down entering by system suspend Artur Petrosyan
2021-04-08 13:40   ` Minas Harutyunyan
2021-04-08  9:46 ` [PATCH v3 13/14] usb: dwc2: Fix partial power down exiting by system resume Artur Petrosyan
2021-04-08 13:40   ` Minas Harutyunyan
2021-04-08  9:46 ` Artur Petrosyan [this message]
2021-04-08 13:41   ` [PATCH v3 14/14] usb: dwc2: Add exit partial power down before removing driver Minas Harutyunyan

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