linux-kernel - [PATCH 5.13 13/22] usb: cdnsp: fix the wrong mult value for HS isoc or intr

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Message-Id: <20210910122916.365208009@linuxfoundation.org>
Date:   Fri, 10 Sep 2021 14:30:12 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Felipe Balbi <balbi@...nel.org>,
        Chunfeng Yun <chunfeng.yun@...iatek.com>
Subject: [PATCH 5.13 13/22] usb: cdnsp: fix the wrong mult value for HS isoc or intr

From: Chunfeng Yun <chunfeng.yun@...iatek.com>

commit e9ab75f26eb9354dfc03aea3401b8cfb42cd6718 upstream.

usb_endpoint_maxp() only returns the bit[10:0] of wMaxPacketSize
of endpoint descriptor, not include bit[12:11] anymore, so use
usb_endpoint_maxp_mult() instead.

Fixes: 3d82904559f4 ("usb: cdnsp: cdns3 Add main part of Cadence USBSSP DRD Driver")
Cc: stable@...r.kernel.org
Acked-by: Felipe Balbi <balbi@...nel.org>
Signed-off-by: Chunfeng Yun <chunfeng.yun@...iatek.com>
Link: https://lore.kernel.org/r/1628836253-7432-4-git-send-email-chunfeng.yun@mediatek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/usb/cdns3/cdnsp-mem.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/usb/cdns3/cdnsp-mem.c
+++ b/drivers/usb/cdns3/cdnsp-mem.c
@@ -882,7 +882,7 @@ static u32 cdnsp_get_endpoint_max_burst(
 	if (g->speed == USB_SPEED_HIGH &&
 	    (usb_endpoint_xfer_isoc(pep->endpoint.desc) ||
 	     usb_endpoint_xfer_int(pep->endpoint.desc)))
-		return (usb_endpoint_maxp(pep->endpoint.desc) & 0x1800) >> 11;
+		return usb_endpoint_maxp_mult(pep->endpoint.desc) - 1;
 
 	return 0;
 }