From: John Crispin <john@phrozen.org>
To: Minas Harutyunyan <hminas@synopsys.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-usb@vger.kernel.org, Serge Vasilugin <vasilugin@yandex.ru>,
John Crispin <john@phrozen.org>
Subject: [PATCH/RFC] usb: dwc2: awake rt305x USB controller
Date: Fri, 20 Jul 2018 14:05:58 +0200 [thread overview]
Message-ID: <20180720120558.8831-1-john@phrozen.org> (raw)
From: Serge Vasilugin <vasilugin@yandex.ru>
The Ralink uboot sets the USB controller into sleep mode. This patch checks
this condition and awakes controller before any register access.
Signed-off-by: Serge Vasilugin <vasilugin@yandex.ru>
Signed-off-by: John Crispin <john@phrozen.org>
---
Hi,
we have been carrying this patch inside OpenWrt for half a decade. The
USB driver that is included in the Ralink SDK does a mdelay(25) after
this call but it works without apparently.
John
drivers/usb/dwc2/platform.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c
index 4c0819554bcd..0bc9fd65e29e 100644
--- a/drivers/usb/dwc2/platform.c
+++ b/drivers/usb/dwc2/platform.c
@@ -419,6 +419,10 @@ static int dwc2_driver_probe(struct platform_device *dev)
if (retval)
return retval;
+ /* Enable USB port before any regs access */
+ if (dwc2_readl(hsotg->regs + PCGCTL) & 0x0f)
+ dwc2_writel(0x00, hsotg->regs + PCGCTL);
+
retval = dwc2_get_dr_mode(hsotg);
if (retval)
goto error;
reply other threads:[~2018-07-20 12:05 UTC|newest]
Thread overview: [no followups] expand[flat|nested] mbox.gz Atom feed
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=20180720120558.8831-1-john@phrozen.org \
--to=john@phrozen.org \
--cc=gregkh@linuxfoundation.org \
--cc=hminas@synopsys.com \
--cc=linux-usb@vger.kernel.org \
--cc=vasilugin@yandex.ru \
/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).