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Message-Id: <1481612990-23409-6-git-send-email-john.stultz@linaro.org>
Date: Mon, 12 Dec 2016 23:09:50 -0800
From: John Stultz <john.stultz@...aro.org>
To: lkml <linux-kernel@...r.kernel.org>
Cc: Chen Yu <chenyu56@...wei.com>, Wei Xu <xuwei5@...ilicon.com>,
Guodong Xu <guodong.xu@...aro.org>,
Amit Pundir <amit.pundir@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
John Youn <johnyoun@...opsys.com>,
Douglas Anderson <dianders@...omium.org>,
Kishon Vijay Abraham I <kishon@...com>,
Felipe Balbi <felipe.balbi@...ux.intel.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-usb@...r.kernel.org, John Stultz <john.stultz@...aro.org>
Subject: [RFC][PATCH 5/5] usb: dwc2: Add a quirk to allow speed negotiation for Hisilicon Hi6220
From: Chen Yu <chenyu56@...wei.com>
The Hi6220's usb controller is limited in that it does not
support "Split Transactions", so it does not support communicating
with low-speed and full-speed devices behind a high-speed hub.
Thus it requires a quirk so that we can manually drop the usb
speed when low/full-speed are attached, and bump back to high
speed when they are removed.
Cc: Wei Xu <xuwei5@...ilicon.com>
Cc: Guodong Xu <guodong.xu@...aro.org>
Cc: Amit Pundir <amit.pundir@...aro.org>
Cc: Rob Herring <robh+dt@...nel.org>
Cc: John Youn <johnyoun@...opsys.com>
Cc: Douglas Anderson <dianders@...omium.org>
Cc: Chen Yu <chenyu56@...wei.com>
Cc: Kishon Vijay Abraham I <kishon@...com>
Cc: Felipe Balbi <felipe.balbi@...ux.intel.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: linux-usb@...r.kernel.org
Signed-off-by: Chen Yu <chenyu56@...wei.com>
[jstultz: Reworked to simplify the patch, and made
commit log to be more specific about the issue]
Signed-off-by: John Stultz <john.stultz@...aro.org>
---
v2:
* Fix build issue reported by kbuildbot
* Rework to avoid using new dts entry suggested by RobH
* Further tweaks from Chen Yu to try to address comments from
John Youn
* Further simplified logic
---
drivers/usb/dwc2/core.h | 6 +++++
drivers/usb/dwc2/hcd.c | 60 +++++++++++++++++++++++++++++++++++++++++++++
drivers/usb/dwc2/platform.c | 1 +
3 files changed, 67 insertions(+)
diff --git a/drivers/usb/dwc2/core.h b/drivers/usb/dwc2/core.h
index 963ea1b..de1fa0c 100644
--- a/drivers/usb/dwc2/core.h
+++ b/drivers/usb/dwc2/core.h
@@ -417,6 +417,11 @@ enum dwc2_ep0_state {
* needed.
* 0 - No (default)
* 1 - Yes
+ * @change_speed_quirk: Change speed configuration to DWC2_SPEED_PARAM_FULL
+ * while full&low speed device connect. And change speed
+ * back to DWC2_SPEED_PARAM_HIGH while device is gone.
+ * 0 - No (default)
+ * 1 - Yes
*
* The following parameters may be specified when starting the module. These
* parameters define how the DWC_otg controller should be configured. A
@@ -457,6 +462,7 @@ struct dwc2_core_params {
int uframe_sched;
int external_id_pin_ctl;
int hibernation;
+ int change_speed_quirk;
};
/**
diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
index 008f5bc..7cf8d8e 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -4873,6 +4873,61 @@ static void _dwc2_hcd_clear_tt_buffer_complete(struct usb_hcd *hcd,
spin_unlock_irqrestore(&hsotg->lock, flags);
}
+/*
+ * HPRT0_SPD_HIGH_SPEED: high speed
+ * HPRT0_SPD_FULL_SPEED: full speed
+ */
+static void dwc2_change_bus_speed(struct usb_hcd *hcd, int speed)
+{
+ struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
+
+ if (hsotg->core_params->speed == speed)
+ return;
+
+ hsotg->core_params->speed = speed;
+ queue_work(hsotg->wq_otg, &hsotg->wf_otg);
+}
+
+static void dwc2_free_dev(struct usb_hcd *hcd, struct usb_device *udev)
+{
+ struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
+
+ if (!hsotg->core_params->change_speed_quirk)
+ return;
+
+ /*
+ * On removal, set speed to default high-speed.
+ */
+ if (udev->parent && udev->parent->speed > USB_SPEED_UNKNOWN &&
+ udev->parent->speed < USB_SPEED_HIGH) {
+ dev_info(hsotg->dev, "Set speed to default high-speed\n");
+ dwc2_change_bus_speed(hcd, HPRT0_SPD_HIGH_SPEED);
+ }
+}
+
+static int dwc2_reset_device(struct usb_hcd *hcd, struct usb_device *udev)
+{
+ struct dwc2_hsotg *hsotg = dwc2_hcd_to_hsotg(hcd);
+
+ if (!hsotg->core_params->change_speed_quirk)
+ return 0;
+
+ if (udev->speed == USB_SPEED_HIGH) {
+ dev_info(hsotg->dev, "Set speed to high-speed\n");
+ dwc2_change_bus_speed(hcd, HPRT0_SPD_HIGH_SPEED);
+ } else if ((udev->speed == USB_SPEED_FULL ||
+ udev->speed == USB_SPEED_LOW)) {
+ /*
+ * Change speed setting to full-speed if there's
+ * a full-speed or low-speed device plugged in.
+ */
+ dev_info(hsotg->dev, "Set speed to full-speed\n");
+ dwc2_change_bus_speed(hcd, HPRT0_SPD_FULL_SPEED);
+ }
+
+ return 0;
+}
+
static struct hc_driver dwc2_hc_driver = {
.description = "dwc2_hsotg",
.product_desc = "DWC OTG Controller",
@@ -5028,6 +5083,11 @@ int dwc2_hcd_init(struct dwc2_hsotg *hsotg, int irq)
dev_warn(hsotg->dev, "can't set coherent DMA mask\n");
}
+ if (hsotg->core_params->change_speed_quirk) {
+ dwc2_hc_driver.free_dev = dwc2_free_dev;
+ dwc2_hc_driver.reset_device = dwc2_reset_device;
+ }
+
hcd = usb_create_hcd(&dwc2_hc_driver, hsotg->dev, dev_name(hsotg->dev));
if (!hcd)
goto error1;
diff --git a/drivers/usb/dwc2/platform.c b/drivers/usb/dwc2/platform.c
index 8e1728b..17eb5fd 100644
--- a/drivers/usb/dwc2/platform.c
+++ b/drivers/usb/dwc2/platform.c
@@ -85,6 +85,7 @@ static const struct dwc2_core_params params_hi6220 = {
.uframe_sched = 0,
.external_id_pin_ctl = -1,
.hibernation = -1,
+ .change_speed_quirk = 1,
};
static const struct dwc2_core_params params_bcm2835 = {
--
2.7.4
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