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From: Tony Lindgren <tony@atomide.com>
To: Bin Liu <b-liu@ti.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	linux-usb@vger.kernel.org, linux-omap@vger.kernel.org,
	Jacopo Mondi <jacopo@jmondi.org>, Marcel Partap <mpartap@gmx.net>,
	Merlijn Wajer <merlijn@wizzup.org>,
	Michael Scott <hashcode0f@gmail.com>, NeKit <nekit1000@gmail.com>,
	Pavel Machek <pavel@ucw.cz>, Sebastian Reichel <sre@kernel.org>
Subject: [PATCH 3/7] usb: musb: omap2430: Handle multiple ID ground interrupts
Date: Wed,  9 Oct 2019 14:21:40 -0700
Message-ID: <20191009212145.28495-4-tony@atomide.com> (raw)
In-Reply-To: <20191009212145.28495-1-tony@atomide.com>

We currently get "unhandled DISCONNECT transition" warnings from musb core
on device disconnect as things are wrongly set to OTG_STATE_A_IDLE in
host mode when enumerating devices. We can also get "Failed to write reg
index" errors after enumerating.

This is happening at least with cpcap phy where we get multiple ID ground
interrupts. Looks like it's VBUS keeps timing out and needs to be kicked
when the phy sends multiple ID ground interrupts during host mode.

Cc: Jacopo Mondi <jacopo@jmondi.org>
Cc: Marcel Partap <mpartap@gmx.net>
Cc: Merlijn Wajer <merlijn@wizzup.org>
Cc: Michael Scott <hashcode0f@gmail.com>
Cc: NeKit <nekit1000@gmail.com>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Sebastian Reichel <sre@kernel.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
---
 drivers/usb/musb/omap2430.c | 25 +++++++++++++++++++------
 1 file changed, 19 insertions(+), 6 deletions(-)

diff --git a/drivers/usb/musb/omap2430.c b/drivers/usb/musb/omap2430.c
--- a/drivers/usb/musb/omap2430.c
+++ b/drivers/usb/musb/omap2430.c
@@ -151,13 +151,26 @@ static void omap_musb_set_mailbox(struct omap2430_glue *glue)
 	switch (glue->status) {
 	case MUSB_ID_GROUND:
 		dev_dbg(musb->controller, "ID GND\n");
-
-		musb->xceiv->otg->state = OTG_STATE_A_IDLE;
-		musb->xceiv->last_event = USB_EVENT_ID;
-		if (musb->gadget_driver) {
-			omap_control_usb_set_mode(glue->control_otghs,
-				USB_MODE_HOST);
+		switch (musb->xceiv->otg->state) {
+		case OTG_STATE_A_WAIT_VRISE:
+		case OTG_STATE_A_WAIT_BCON:
+		case OTG_STATE_A_HOST:
+		case OTG_STATE_A_IDLE:
+			/*
+			 * On multiple ID ground interrupts just keep enabling
+			 * VBUS. At least cpcap VBUS shuts down otherwise.
+			 */
 			omap2430_musb_set_vbus(musb, 1);
+			break;
+		default:
+			musb->xceiv->otg->state = OTG_STATE_A_IDLE;
+			musb->xceiv->last_event = USB_EVENT_ID;
+			if (musb->gadget_driver) {
+				omap_control_usb_set_mode(glue->control_otghs,
+							  USB_MODE_HOST);
+				omap2430_musb_set_vbus(musb, 1);
+			}
+			break;
 		}
 		break;
 
-- 
2.23.0

  parent reply index

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-10-09 21:21 [PATCHv2 0/7] musb host improvments mostly for omap2430 glue Tony Lindgren
2019-10-09 21:21 ` [PATCH 1/7] usb: musb: omap2430: Get rid of musb .set_vbus " Tony Lindgren
2019-10-09 21:21 ` [PATCH 2/7] usb: musb: omap2430: Wait on enable to avoid babble Tony Lindgren
2019-10-10  9:46   ` Sergei Shtylyov
2019-10-16 15:39     ` Tony Lindgren
2019-10-09 21:21 ` Tony Lindgren [this message]
2019-10-13 11:32   ` [PATCH 3/7] usb: musb: omap2430: Handle multiple ID ground interrupts Pavel Machek
2019-10-09 21:21 ` [PATCH 4/7] usb: musb: Add musb_set_host and peripheral and use them for omap2430 Tony Lindgren
2019-10-09 21:21 ` [PATCH 5/7] usb: musb: omap2430: Clean up enable and remove devctl tinkering Tony Lindgren
2019-10-09 21:21 ` [PATCH 6/7] usb: musb: omap2430: Idle musb on init Tony Lindgren
2019-10-09 21:21 ` [PATCH 7/7] usb: musb: Get rid of omap2430_musb_set_vbus() Tony Lindgren
2019-10-13 14:34   ` Pavel Machek

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