linux-kernel - [PATCH] usb: gadget: f_uac2: calculate wMaxPacketSize before endpoint match

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Date:   Wed, 17 May 2017 13:45:17 +0530
From:   Sekhar Nori <nsekhar@...com>
To:     Felipe Balbi <balbi@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     Bin Liu <b-liu@...com>, Roger Quadros <rogerq@...com>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Sekhar Nori <nsekhar@...com>
Subject: [PATCH] usb: gadget: f_uac2: calculate wMaxPacketSize before endpoint match

Calculate wMaxPacketSize before endpoint matching the
descriptor is found.

This allows audio gadget to be used with controllers
which have a shortage or unavailability of endpoints
that can handle max packet size of 1023 (FS) or 1024
(HS).

With this audio gadget can be used on TI's OMAP-L138 SoC
which has a MUSB HS controller with endpoints having max
packet size much less than 1023 or 1024. See mode_2_cfg in
drivers/usb/musb/musb_core.c

Signed-off-by: Sekhar Nori <nsekhar@...com>
---
 drivers/usb/gadget/function/f_uac2.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/usb/gadget/function/f_uac2.c b/drivers/usb/gadget/function/f_uac2.c
index f6a0d3a1311b..5a7ba058d947 100644
--- a/drivers/usb/gadget/function/f_uac2.c
+++ b/drivers/usb/gadget/function/f_uac2.c
@@ -1065,6 +1065,12 @@ afunc_bind(struct usb_configuration *cfg, struct usb_function *fn)
 	agdev->as_in_intf = ret;
 	agdev->as_in_alt = 0;
 
+	/* Calculate wMaxPacketSize according to audio bandwidth */
+	set_ep_max_packet_size(uac2_opts, &fs_epin_desc, 1000, true);
+	set_ep_max_packet_size(uac2_opts, &fs_epout_desc, 1000, false);
+	set_ep_max_packet_size(uac2_opts, &hs_epin_desc, 8000, true);
+	set_ep_max_packet_size(uac2_opts, &hs_epout_desc, 8000, false);
+
 	agdev->out_ep = usb_ep_autoconfig(gadget, &fs_epout_desc);
 	if (!agdev->out_ep) {
 		dev_err(dev, "%s:%d Error!\n", __func__, __LINE__);
@@ -1080,12 +1086,6 @@ afunc_bind(struct usb_configuration *cfg, struct usb_function *fn)
 	uac2->p_prm.uac2 = uac2;
 	uac2->c_prm.uac2 = uac2;
 
-	/* Calculate wMaxPacketSize according to audio bandwidth */
-	set_ep_max_packet_size(uac2_opts, &fs_epin_desc, 1000, true);
-	set_ep_max_packet_size(uac2_opts, &fs_epout_desc, 1000, false);
-	set_ep_max_packet_size(uac2_opts, &hs_epin_desc, 8000, true);
-	set_ep_max_packet_size(uac2_opts, &hs_epout_desc, 8000, false);
-
 	hs_epout_desc.bEndpointAddress = fs_epout_desc.bEndpointAddress;
 	hs_epin_desc.bEndpointAddress = fs_epin_desc.bEndpointAddress;
 
-- 
2.9.0