From: Pawel Laszczak <pawell@cadence.com>
To: <peter.chen@kernel.org>
Cc: <gregkh@linuxfoundation.org>, <linux-usb@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <kurahul@cadence.com>,
Pawel Laszczak <pawell@cadence.com>
Subject: [PATCH v2] usb: cdnsp: Fixes issue with Configure Endpoint command
Date: Wed, 7 Apr 2021 08:36:29 +0200 [thread overview]
Message-ID: <20210407063629.43685-1-pawell@gli-login.cadence.com> (raw)
From: Pawel Laszczak <pawell@cadence.com>
Patch adds flag EP_UNCONFIGURED to detect whether endpoint was
unconfigured. This flag is set in cdnsp_reset_device after Reset Device
command. Among others this command disables all non control endpoints.
Flag is used in cdnsp_gadget_ep_disable to protect controller against
invoking Configure Endpoint command on disabled endpoint. Lack of this
protection in some cases caused that Configure Endpoint command completed
with Context State Error code completion.
Fixes: 3d82904559f4 ("usb: cdnsp: cdns3 Add main part of Cadence USBSSP DRD Driver")
Signed-off-by: Pawel Laszczak <pawell@cadence.com>
---
Changelog:
v2:
- removed useless blank line
- changed the EP_UNCONFIGURED to limit changes in patch
drivers/usb/cdns3/cdnsp-gadget.c | 17 ++++++++++++-----
drivers/usb/cdns3/cdnsp-gadget.h | 1 +
2 files changed, 13 insertions(+), 5 deletions(-)
diff --git a/drivers/usb/cdns3/cdnsp-gadget.c b/drivers/usb/cdns3/cdnsp-gadget.c
index d7d4bdd57f46..56707b6b0f57 100644
--- a/drivers/usb/cdns3/cdnsp-gadget.c
+++ b/drivers/usb/cdns3/cdnsp-gadget.c
@@ -727,7 +727,7 @@ int cdnsp_reset_device(struct cdnsp_device *pdev)
* are in Disabled state.
*/
for (i = 1; i < CDNSP_ENDPOINTS_NUM; ++i)
- pdev->eps[i].ep_state |= EP_STOPPED;
+ pdev->eps[i].ep_state |= EP_STOPPED | EP_UNCONFIGURED;
trace_cdnsp_handle_cmd_reset_dev(slot_ctx);
@@ -942,6 +942,7 @@ static int cdnsp_gadget_ep_enable(struct usb_ep *ep,
pep = to_cdnsp_ep(ep);
pdev = pep->pdev;
+ pep->ep_state &= ~EP_UNCONFIGURED;
if (dev_WARN_ONCE(pdev->dev, pep->ep_state & EP_ENABLED,
"%s is already enabled\n", pep->name))
@@ -1023,9 +1024,13 @@ static int cdnsp_gadget_ep_disable(struct usb_ep *ep)
goto finish;
}
- cdnsp_cmd_stop_ep(pdev, pep);
pep->ep_state |= EP_DIS_IN_RROGRESS;
- cdnsp_cmd_flush_ep(pdev, pep);
+
+ /* Endpoint was unconfigured by Reset Device command. */
+ if (!(pep->ep_state & EP_UNCONFIGURED)) {
+ cdnsp_cmd_stop_ep(pdev, pep);
+ cdnsp_cmd_flush_ep(pdev, pep);
+ }
/* Remove all queued USB requests. */
while (!list_empty(&pep->pending_list)) {
@@ -1043,10 +1048,12 @@ static int cdnsp_gadget_ep_disable(struct usb_ep *ep)
cdnsp_endpoint_zero(pdev, pep);
- ret = cdnsp_update_eps_configuration(pdev, pep);
+ if (!(pep->ep_state & EP_UNCONFIGURED))
+ ret = cdnsp_update_eps_configuration(pdev, pep);
+
cdnsp_free_endpoint_rings(pdev, pep);
- pep->ep_state &= ~EP_ENABLED;
+ pep->ep_state &= ~(EP_ENABLED | EP_UNCONFIGURED);
pep->ep_state |= EP_STOPPED;
finish:
diff --git a/drivers/usb/cdns3/cdnsp-gadget.h b/drivers/usb/cdns3/cdnsp-gadget.h
index 6bbb26548c04..783ca8ffde00 100644
--- a/drivers/usb/cdns3/cdnsp-gadget.h
+++ b/drivers/usb/cdns3/cdnsp-gadget.h
@@ -835,6 +835,7 @@ struct cdnsp_ep {
#define EP_WEDGE BIT(4)
#define EP0_HALTED_STATUS BIT(5)
#define EP_HAS_STREAMS BIT(6)
+#define EP_UNCONFIGURED BIT(7)
bool skip;
};
--
2.25.1
next reply other threads:[~2021-04-07 6:37 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-07 6:36 Pawel Laszczak [this message]
2021-04-10 1:11 ` [PATCH v2] usb: cdnsp: Fixes issue with Configure Endpoint command Peter Chen
2021-04-10 1:22 ` Peter Chen
2021-04-12 3:30 ` Pawel Laszczak
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20210407063629.43685-1-pawell@gli-login.cadence.com \
--to=pawell@cadence.com \
--cc=gregkh@linuxfoundation.org \
--cc=kurahul@cadence.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-usb@vger.kernel.org \
--cc=peter.chen@kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).