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Date: Wed, 19 Sep 2012 17:00:27 +0530
From: Kishon Vijay Abraham I <kishon@...com>
To: <grant.likely@...retlab.ca>, <rob.herring@...xeda.com>,
<rob@...dley.net>, <linux@....linux.org.uk>, <kishon@...com>,
<balbi@...com>, <linux-usb@...r.kernel.org>,
<linux-omap@...r.kernel.org>,
<devicetree-discuss@...ts.ozlabs.org>, <linux-doc@...r.kernel.org>,
<linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>
CC: Moiz Sonasath <m-sonasath@...com>
Subject: [PATCH 2/4] usb: dwc3: Fix gadget pullup in SS mode
From: Moiz Sonasath <m-sonasath@...com>
For the gadget pullup functionality to work in
SS mode it requires a particular sequence of
toggling the run-stop bit. Here is the required
sequence:
- Set DCTL[31]
- Clear DCTL[31]
- Clear OMAP5430_CONTROL_CORE__PHY_POWER_USB[14]
- Clear DCTL[8:5] = 0x00
- Set DCTL[8:5] = 0x05
- Wait 25 Ms
- Set DCTL[31]
- Set OMAP5430_CONTROL_CORE__PHY_POWER_USB[14]
Tested rigourously the gadget pull-up functionality
in bot HS and SS modes.
Signed-off-by: Moiz Sonasath <m-sonasath@...com>
Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
---
drivers/usb/dwc3/gadget.c | 21 +++++++++++++++------
drivers/usb/phy/omap-usb3.c | 16 ++++++++++++++++
include/linux/usb/phy.h | 10 +++++++++-
3 files changed, 40 insertions(+), 7 deletions(-)
diff --git a/drivers/usb/dwc3/gadget.c b/drivers/usb/dwc3/gadget.c
index 58fdfad..bcc0102 100644
--- a/drivers/usb/dwc3/gadget.c
+++ b/drivers/usb/dwc3/gadget.c
@@ -49,6 +49,7 @@
#include <linux/usb/ch9.h>
#include <linux/usb/gadget.h>
+#include <linux/usb/otg.h>
#include "core.h"
#include "gadget.h"
@@ -1417,19 +1418,27 @@ static int dwc3_gadget_run_stop(struct dwc3 *dwc, int is_on)
reg = dwc3_readl(dwc->regs, DWC3_DCTL);
if (is_on) {
if (dwc->revision <= DWC3_REVISION_187A) {
- reg &= ~DWC3_DCTL_TRGTULST_MASK;
- reg |= DWC3_DCTL_TRGTULST_RX_DET;
+ reg &= ~DWC3_DCTL_ULSTCHNGREQ_MASK;
+ dwc3_writel(dwc->regs, DWC3_DCTL, reg);
+ reg |= DWC3_DCTL_ULSTCHNG_RX_DETECT;
+ dwc3_writel(dwc->regs, DWC3_DCTL, reg);
+ mdelay(25);
+ reg |= DWC3_DCTL_RUN_STOP;
+ dwc3_writel(dwc->regs, DWC3_DCTL, reg);
+ usb_phy_poweron(dwc->usb3_phy);
}
- if (dwc->revision >= DWC3_REVISION_194A)
+ if (dwc->revision >= DWC3_REVISION_194A) {
reg &= ~DWC3_DCTL_KEEP_CONNECT;
- reg |= DWC3_DCTL_RUN_STOP;
+ reg |= DWC3_DCTL_RUN_STOP;
+ dwc3_writel(dwc->regs, DWC3_DCTL, reg);
+ }
} else {
reg &= ~DWC3_DCTL_RUN_STOP;
+ dwc3_writel(dwc->regs, DWC3_DCTL, reg);
+ usb_phy_shutdown(dwc->usb3_phy);
}
- dwc3_writel(dwc->regs, DWC3_DCTL, reg);
-
do {
reg = dwc3_readl(dwc->regs, DWC3_DSTS);
if (is_on) {
diff --git a/drivers/usb/phy/omap-usb3.c b/drivers/usb/phy/omap-usb3.c
index 4dc84ca..26402d5 100644
--- a/drivers/usb/phy/omap-usb3.c
+++ b/drivers/usb/phy/omap-usb3.c
@@ -212,6 +212,20 @@ static int omap_usb3_init(struct usb_phy *x)
return 0;
}
+static void omap_usb3_poweron(struct usb_phy *x)
+{
+ struct omap_usb *phy = phy_to_omapusb(x);
+
+ omap5_usb_phy_power(phy, 1);
+}
+
+static void omap_usb3_shutdown(struct usb_phy *x)
+{
+ struct omap_usb *phy = phy_to_omapusb(x);
+
+ omap5_usb_phy_power(phy, 0);
+}
+
static int __devinit omap_usb3_probe(struct platform_device *pdev)
{
struct omap_usb *phy;
@@ -253,6 +267,8 @@ static int __devinit omap_usb3_probe(struct platform_device *pdev)
phy->phy.dev = phy->dev;
phy->phy.label = "omap-usb3";
phy->phy.init = omap_usb3_init;
+ phy->phy.poweron = omap_usb3_poweron;
+ phy->phy.shutdown = omap_usb3_shutdown;
phy->phy.set_suspend = omap_usb3_suspend;
phy->is_suspended = 1;
diff --git a/include/linux/usb/phy.h b/include/linux/usb/phy.h
index 06b5bae..aaa8e16 100644
--- a/include/linux/usb/phy.h
+++ b/include/linux/usb/phy.h
@@ -86,8 +86,9 @@ struct usb_phy {
/* to support controllers that have multiple transceivers */
struct list_head head;
- /* initialize/shutdown the OTG controller */
+ /* initialize/poweron/shutdown the OTG controller */
int (*init)(struct usb_phy *x);
+ void (*poweron)(struct usb_phy *x);
void (*shutdown)(struct usb_phy *x);
/* effective for B devices, ignored for A-peripheral */
@@ -135,6 +136,13 @@ usb_phy_init(struct usb_phy *x)
}
static inline void
+usb_phy_poweron(struct usb_phy *x)
+{
+ if (x->poweron)
+ x->poweron(x);
+}
+
+static inline void
usb_phy_shutdown(struct usb_phy *x)
{
if (x->shutdown)
--
1.7.9.5
--
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