linux-kernel - [PATCH v2] usb: gadget: config_ep_by_speed_and_alt instead of config_ep_by

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Message-ID: <20200918083035.17280-1-pawell@cadence.com>
Date:   Fri, 18 Sep 2020 10:30:35 +0200
From:   Pawel Laszczak <pawell@...ence.com>
To:     <balbi@...nel.org>, <gregkh@...uxfoundation.org>
CC:     <jpawar@...ence.com>, <christophe.jaillet@...adoo.fr>,
        <sudhakar.panneerselvam@...cle.com>, <gustavoars@...nel.org>,
        <pawell@...ence.com>, <Thinh.Nguyen@...opsys.com>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <kurahul@...ence.com>
Subject: [PATCH v2] usb: gadget: config_ep_by_speed_and_alt instead of config_ep_by_speed

This patch replace config_ep_by_speed with config_ep_by_speed_and_alt.
This change allows to select proper usb_ss_ep_comp_descriptor for each
stream capable endpoints.

f_tcm function for SS use array of headers for both BOT/UAS alternate
setting:

static struct usb_descriptor_header *uasp_ss_function_desc[] = {
        (struct usb_descriptor_header *) &bot_intf_desc,
        (struct usb_descriptor_header *) &uasp_ss_bi_desc,
        (struct usb_descriptor_header *) &bot_bi_ep_comp_desc,
        (struct usb_descriptor_header *) &uasp_ss_bo_desc,
        (struct usb_descriptor_header *) &bot_bo_ep_comp_desc,

        (struct usb_descriptor_header *) &uasp_intf_desc,
        (struct usb_descriptor_header *) &uasp_ss_bi_desc,
        (struct usb_descriptor_header *) &uasp_bi_ep_comp_desc,
        (struct usb_descriptor_header *) &uasp_bi_pipe_desc,
        (struct usb_descriptor_header *) &uasp_ss_bo_desc,
        (struct usb_descriptor_header *) &uasp_bo_ep_comp_desc,
        (struct usb_descriptor_header *) &uasp_bo_pipe_desc,
        (struct usb_descriptor_header *) &uasp_ss_status_desc,
        (struct usb_descriptor_header *) &uasp_status_in_ep_comp_desc,
        (struct usb_descriptor_header *) &uasp_status_pipe_desc,
        (struct usb_descriptor_header *) &uasp_ss_cmd_desc,
        (struct usb_descriptor_header *) &uasp_cmd_comp_desc,
        (struct usb_descriptor_header *) &uasp_cmd_pipe_desc,
        NULL,
};

The first 5 descriptors are associated with BOT alternate setting,
and others are associated with UAS.

During handling UAS alternate setting f_tcm driver invokes
config_ep_by_speed and this function sets incorrect companion endpoint
descriptor in usb_ep object.

Instead setting ep->comp_desc to uasp_bi_ep_comp_desc function in this
case set ep->comp_desc to bot_uasp_ss_bi_desc.

And in result it uses the descriptor from BOT alternate setting
instead UAS.

Finally, it causes that controller driver during enabling endpoints
detect that just enabled endpoint for bot.

Signed-off-by: Jayshri Pawar <jpawar@...ence.com>
Signed-off-by: Pawel Laszczak <pawell@...ence.com>
Reviewed-by: Peter Chen <peter.chen@....com>

Changelog:
v2:
- typo and unnecessary space have been removed from patch description.

---
 drivers/usb/gadget/function/f_tcm.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/usb/gadget/function/f_tcm.c b/drivers/usb/gadget/function/f_tcm.c
index 184165e27908..410fa89eae8f 100644
--- a/drivers/usb/gadget/function/f_tcm.c
+++ b/drivers/usb/gadget/function/f_tcm.c
@@ -392,12 +392,12 @@ static void bot_set_alt(struct f_uas *fu)
 
 	fu->flags = USBG_IS_BOT;
 
-	config_ep_by_speed(gadget, f, fu->ep_in);
+	config_ep_by_speed_and_alt(gadget, f, fu->ep_in, USB_G_ALT_INT_BBB);
 	ret = usb_ep_enable(fu->ep_in);
 	if (ret)
 		goto err_b_in;
 
-	config_ep_by_speed(gadget, f, fu->ep_out);
+	config_ep_by_speed_and_alt(gadget, f, fu->ep_out, USB_G_ALT_INT_BBB);
 	ret = usb_ep_enable(fu->ep_out);
 	if (ret)
 		goto err_b_out;
@@ -852,21 +852,21 @@ static void uasp_set_alt(struct f_uas *fu)
 	if (gadget->speed >= USB_SPEED_SUPER)
 		fu->flags |= USBG_USE_STREAMS;
 
-	config_ep_by_speed(gadget, f, fu->ep_in);
+	config_ep_by_speed_and_alt(gadget, f, fu->ep_in, USB_G_ALT_INT_UAS);
 	ret = usb_ep_enable(fu->ep_in);
 	if (ret)
 		goto err_b_in;
 
-	config_ep_by_speed(gadget, f, fu->ep_out);
+	config_ep_by_speed_and_alt(gadget, f, fu->ep_out, USB_G_ALT_INT_UAS);
 	ret = usb_ep_enable(fu->ep_out);
 	if (ret)
 		goto err_b_out;
 
-	config_ep_by_speed(gadget, f, fu->ep_cmd);
+	config_ep_by_speed_and_alt(gadget, f, fu->ep_cmd, USB_G_ALT_INT_UAS);
 	ret = usb_ep_enable(fu->ep_cmd);
 	if (ret)
 		goto err_cmd;
-	config_ep_by_speed(gadget, f, fu->ep_status);
+	config_ep_by_speed_and_alt(gadget, f, fu->ep_status, USB_G_ALT_INT_UAS);
 	ret = usb_ep_enable(fu->ep_status);
 	if (ret)
 		goto err_status;
-- 
2.17.1