From: Roger Quadros <rogerq@ti.com>
To: <balbi@kernel.org>
Cc: <Dylan.Howey@tennantco.com>, <linux-usb@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, Roger Quadros <rogerq@ti.com>,
"# v4 . 13+" <stable@vger.kernel.org>
Subject: [PATCH] usb: dwc3: gadget: Fix .udc_set_speed()
Date: Tue, 31 Oct 2017 15:01:44 +0200 [thread overview]
Message-ID: <1509454904-4966-1-git-send-email-rogerq@ti.com> (raw)
UDC core calls .udc_set_speed() with the speed parameter
containing the maximum speed supported by the gadget function
driver. This might very well be more or less than that
supported by the dwc3 controller driver.
Select the lesser of the 2 speeds so both are operating
within limits.
This fixes PHY Erratic errors and 2 second enumeration delay on
TI's AM437x platforms.
Fixes: 7d8d0639565f ("usb: dwc3: gadget: implement ->udc_set_speed()")
Cc: <stable@vger.kernel.org> # v4.13+
Reported-by: Dylan Howey <Dylan.Howey@tennantco.com>
Signed-off-by: Roger Quadros <rogerq@ti.com>
---
drivers/usb/dwc3/gadget.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index f064f15..9f27ec0 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -2008,6 +2008,8 @@ static void dwc3_gadget_set_speed(struct usb_gadget *g,
unsigned long flags;
u32 reg;
+ speed = min(g->max_speed, speed);
+
spin_lock_irqsave(&dwc->lock, flags);
reg = dwc3_readl(dwc->regs, DWC3_DCFG);
reg &= ~(DWC3_DCFG_SPEED_MASK);
--
cheers,
-roger
Texas Instruments Finland Oy, Porkkalankatu 22, 00180 Helsinki. Y-tunnus/Business ID: 0615521-4. Kotipaikka/Domicile: Helsinki
next reply other threads:[~2017-10-31 13:02 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-31 13:01 Roger Quadros [this message]
2017-10-31 13:24 ` [PATCH] usb: dwc3: gadget: Fix .udc_set_speed() Felipe Balbi
2017-10-31 13:27 ` Roger Quadros
2017-10-31 13:47 ` [PATCH v2] " Roger Quadros
2017-10-31 13:54 ` Roger Quadros
2017-10-31 13:56 ` [PATCH v2][RESEND] usb: gadget: core: Fix ->udc_set_speed() speed handling Roger Quadros
2017-11-01 14:24 ` Alan Stern
2017-11-01 15:11 ` Roger Quadros
2017-11-01 15:45 ` Alan Stern
2017-11-02 8:53 ` Roger Quadros
2017-11-02 14:14 ` Alan Stern
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