linux-kernel - [PATCHv2] phy: cpcap-usb: Fix flakey host idling and enumerating of devices

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Message-Id: <20191222180019.55417-1-tony@atomide.com>
Date:   Sun, 22 Dec 2019 10:00:19 -0800
From:   Tony Lindgren <tony@...mide.com>
To:     Kishon Vijay Abraham I <kishon@...com>
Cc:     linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-omap@...r.kernel.org, Jacopo Mondi <jacopo@...ndi.org>,
        Marcel Partap <mpartap@....net>,
        Merlijn Wajer <merlijn@...zup.org>,
        Michael Scott <hashcode0f@...il.com>,
        NeKit <nekit1000@...il.com>, Pavel Machek <pavel@....cz>,
        Sebastian Reichel <sre@...nel.org>
Subject: [PATCHv2] phy: cpcap-usb: Fix flakey host idling and enumerating of devices

We must let the USB host idle things properly before we switch to debug
UART mode. Otherwise the USB host may never idle after disconnecting
devices, and that causes the next enumeration to be flakey.

Cc: Jacopo Mondi <jacopo@...ndi.org>
Cc: Marcel Partap <mpartap@....net>
Cc: Merlijn Wajer <merlijn@...zup.org>
Cc: Michael Scott <hashcode0f@...il.com>
Cc: NeKit <nekit1000@...il.com>
Cc: Pavel Machek <pavel@....cz>
Cc: Sebastian Reichel <sre@...nel.org>
Fixes: 6d6ce40f63af ("phy: cpcap-usb: Add CPCAP PMIC USB support")
Signed-off-by: Tony Lindgren <tony@...mide.com>
---

Kishon, looks like the v1 patch sent in August got lost somewhere.
Here's a resend update against your fixes branch.


 drivers/phy/motorola/phy-cpcap-usb.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/phy/motorola/phy-cpcap-usb.c b/drivers/phy/motorola/phy-cpcap-usb.c
--- a/drivers/phy/motorola/phy-cpcap-usb.c
+++ b/drivers/phy/motorola/phy-cpcap-usb.c
@@ -283,13 +283,13 @@ static void cpcap_usb_detect(struct work_struct *work)
 		return;
 	}
 
+	cpcap_usb_try_musb_mailbox(ddata, MUSB_VBUS_OFF);
+
 	/* Default to debug UART mode */
 	error = cpcap_usb_set_uart_mode(ddata);
 	if (error)
 		goto out_err;
 
-	cpcap_usb_try_musb_mailbox(ddata, MUSB_VBUS_OFF);
-
 	dev_dbg(ddata->dev, "set UART mode\n");
 
 	return;
-- 
2.24.1