linux-kernel - [PATCH 2/2] media: uvc: Undup use uvv-endpoint_max

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Date:   Fri,  1 Apr 2022 19:24:37 +0200
From:   Ricardo Ribalda <ribalda@...omium.org>
To:     Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Ricardo Ribalda <ribalda@...omium.org>
Subject: [PATCH 2/2] media: uvc: Undup use uvv-endpoint_max_bpi code

Replace manual decoding of psize in uvc_parse_streaming(), with the code
from uvc_endpoint_max_bpi(). It also handles usb3 devices.

Signed-off-by: Ricardo Ribalda <ribalda@...omium.org>
---
 drivers/media/usb/uvc/uvc_driver.c | 4 +---
 drivers/media/usb/uvc/uvc_video.c  | 3 +--
 drivers/media/usb/uvc/uvcvideo.h   | 1 +
 3 files changed, 3 insertions(+), 5 deletions(-)

diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c
index dda0f0aa78b8..977566aa2c89 100644
--- a/drivers/media/usb/uvc/uvc_driver.c
+++ b/drivers/media/usb/uvc/uvc_driver.c
@@ -1009,9 +1009,7 @@ static int uvc_parse_streaming(struct uvc_device *dev,
 				streaming->header.bEndpointAddress);
 		if (ep == NULL)
 			continue;
-
-		psize = le16_to_cpu(ep->desc.wMaxPacketSize);
-		psize = (psize & 0x07ff) * (1 + ((psize >> 11) & 3));
+		psize = uvc_endpoint_max_bpi(dev->udev, ep);
 		if (psize > streaming->maxpsize)
 			streaming->maxpsize = psize;
 	}
diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c
index a2dcfeaaac1b..9dc0a5dba158 100644
--- a/drivers/media/usb/uvc/uvc_video.c
+++ b/drivers/media/usb/uvc/uvc_video.c
@@ -1756,8 +1756,7 @@ static void uvc_video_stop_transfer(struct uvc_streaming *stream,
 /*
  * Compute the maximum number of bytes per interval for an endpoint.
  */
-static unsigned int uvc_endpoint_max_bpi(struct usb_device *dev,
-					 struct usb_host_endpoint *ep)
+u16 uvc_endpoint_max_bpi(struct usb_device *dev, struct usb_host_endpoint *ep)
 {
 	u16 psize;
 
diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h
index 143230b3275b..28eb337a6cfb 100644
--- a/drivers/media/usb/uvc/uvcvideo.h
+++ b/drivers/media/usb/uvc/uvcvideo.h
@@ -911,6 +911,7 @@ void uvc_simplify_fraction(u32 *numerator, u32 *denominator,
 u32 uvc_fraction_to_interval(u32 numerator, u32 denominator);
 struct usb_host_endpoint *uvc_find_endpoint(struct usb_host_interface *alts,
 					    u8 epaddr);
+u16 uvc_endpoint_max_bpi(struct usb_device *dev, struct usb_host_endpoint *ep);
 
 /* Quirks support */
 void uvc_video_decode_isight(struct uvc_urb *uvc_urb,
-- 
2.35.1.1094.g7c7d902a7c-goog