* [RFC][PATCH 1/2 v2] usb: dwc2: Force port resume on switching to device mode
2016-10-20 4:14 [RFC][PATCH 0/2 v2] dwc2 fixes for HiKey John Stultz
@ 2016-10-20 4:14 ` John Stultz
2016-10-20 4:14 ` [RFC][PATCH 2/2 v2] usb: dwc2: Add a quirk to allow speed negotiation for Hisilicon Hi6220 John Stultz
1 sibling, 0 replies; 3+ messages in thread
From: John Stultz @ 2016-10-20 4:14 UTC (permalink / raw)
To: lkml
Cc: Chen Yu, Wei Xu, Guodong Xu, Amit Pundir, Rob Herring, John Youn,
Douglas Anderson, Greg Kroah-Hartman, linux-usb, John Stultz
From: Chen Yu <chenyu56@huawei.com>
We've seen failures when switching between host and gadget mode,
which was diagnosed as being caused due to the bus being
auto-suspended when we switched.
So this patch forces a port resume when switching to device
mode if the bus is suspended.
Cc: Wei Xu <xuwei5@hisilicon.com>
Cc: Guodong Xu <guodong.xu@linaro.org>
Cc: Amit Pundir <amit.pundir@linaro.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: John Youn <johnyoun@synopsys.com>
Cc: Douglas Anderson <dianders@chromium.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-usb@vger.kernel.org
Signed-off-by: Chen Yu <chenyu56@huawei.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
---
drivers/usb/dwc2/hcd.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/drivers/usb/dwc2/hcd.c b/drivers/usb/dwc2/hcd.c
index df5a065..b374e60 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -54,6 +54,9 @@
#include "core.h"
#include "hcd.h"
+
+static void dwc2_port_resume(struct dwc2_hsotg *hsotg);
+
/*
* =========================================================================
* Host Core Layer Functions
@@ -3204,6 +3207,11 @@ static void dwc2_conn_id_status_change(struct work_struct *work)
if (gotgctl & GOTGCTL_CONID_B) {
/* Wait for switch to device mode */
dev_dbg(hsotg->dev, "connId B\n");
+ if (hsotg->bus_suspended) {
+ dev_info(hsotg->dev,
+ "Do port resume before switching to device mode\n");
+ dwc2_port_resume(hsotg);
+ }
while (!dwc2_is_device_mode(hsotg)) {
dev_info(hsotg->dev,
"Waiting for Peripheral Mode, Mode=%s\n",
--
2.7.4
^ permalink raw reply [flat|nested] 3+ messages in thread* [RFC][PATCH 2/2 v2] usb: dwc2: Add a quirk to allow speed negotiation for Hisilicon Hi6220
2016-10-20 4:14 [RFC][PATCH 0/2 v2] dwc2 fixes for HiKey John Stultz
2016-10-20 4:14 ` [RFC][PATCH 1/2 v2] usb: dwc2: Force port resume on switching to device mode John Stultz
@ 2016-10-20 4:14 ` John Stultz
1 sibling, 0 replies; 3+ messages in thread
From: John Stultz @ 2016-10-20 4:14 UTC (permalink / raw)
To: lkml
Cc: Chen Yu, Wei Xu, Guodong Xu, Amit Pundir, Rob Herring, John Youn,
Douglas Anderson, Greg Kroah-Hartman, linux-usb, John Stultz
From: Chen Yu <chenyu56@huawei.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@hisilicon.com>
Cc: Guodong Xu <guodong.xu@linaro.org>
Cc: Amit Pundir <amit.pundir@linaro.org>
Cc: Rob Herring <robh+dt@kernel.org>
Cc: John Youn <johnyoun@synopsys.com>
Cc: Douglas Anderson <dianders@chromium.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: linux-usb@vger.kernel.org
Signed-off-by: Chen Yu <chenyu56@huawei.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@linaro.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 | 61 +++++++++++++++++++++++++++++++++++++++++++++
drivers/usb/dwc2/platform.c | 1 +
3 files changed, 68 insertions(+)
diff --git a/drivers/usb/dwc2/core.h b/drivers/usb/dwc2/core.h
index 2a21a04..baa4f64 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 b374e60..85121e2 100644
--- a/drivers/usb/dwc2/hcd.c
+++ b/drivers/usb/dwc2/hcd.c
@@ -4868,6 +4868,62 @@ 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",
@@ -5023,6 +5079,11 @@ 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
^ permalink raw reply [flat|nested] 3+ messages in thread