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UPSTREAM: usb: dwc3: gadget: Use max speed if unspecified

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If the gadget driver doesn't specify a max_speed, then use the
controller's maximum supported speed as default. For DWC_usb32 IP, the
gadget's speed maybe limited to gen2x1 rate only if the driver's
max_speed is unknown. This scenario should not occur with the current
implementation since the default gadget driver's max_speed should always
be specified. However, to make the driver more robust and help with
readability, let's cover all the scenarios in __dwc3_gadget_set_speed().

Fixes: 450b9e9fab ("usb: dwc3: gadget: Set speed only up to the max supported")
Cc: <stable@vger.kernel.org>
Signed-off-by: Thinh Nguyen <Thinh.Nguyen@synopsys.com>
Link: https://lore.kernel.org/r/55ac7001af73bfe9bc750c6446ef4ac8cf6f9313.1615254129.git.Thinh.Nguyen@synopsys.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
(cherry picked from commit 93f1d43c57)
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I8cadeeb472317c2d7fe29a4f534386cb77427841
This commit is contained in:
Thinh Nguyen
2021-03-08 18:16:50 -08:00
committed by Greg Kroah-Hartman
parent ce8beb071a
commit e82381ad9a
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/dwc3/gadget.c
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@@ -2081,7 +2081,7 @@ static void __dwc3_gadget_set_speed(struct dwc3 *dwc)
u32 reg;
speed = dwc->gadget_max_speed;
if (speed > dwc->maximum_speed)
if (speed == USB_SPEED_UNKNOWN || speed > dwc->maximum_speed)
speed = dwc->maximum_speed;
if (speed == USB_SPEED_SUPER_PLUS &&