From: Michael Grzeschik <m.grzeschik@xxxxxxxxxxxxxx>
This patch makes it possible to set the chipidea udc
into full-speed only mode. It can be set by the oftree
property "force-full-speed".
Signed-off-by: Michael Grzeschik <m.grzeschik@xxxxxxxxxxxxxx>
Signed-off-by: Marc Kleine-Budde <mkl@xxxxxxxxxxxxxx>
---
Documentation/devicetree/bindings/usb/ci13xxx-imx.txt | 2 ++
drivers/usb/chipidea/bits.h | 2 ++
drivers/usb/chipidea/core.c | 6 ++++++
3 files changed, 10 insertions(+)
diff --git a/Documentation/devicetree/bindings/usb/ci13xxx-imx.txt b/Documentation/devicetree/bindings/usb/ci13xxx-imx.txt
index b4b5b79..1943aef 100644
--- a/Documentation/devicetree/bindings/usb/ci13xxx-imx.txt
+++ b/Documentation/devicetree/bindings/usb/ci13xxx-imx.txt
@@ -18,6 +18,7 @@ Optional properties:
- vbus-supply: regulator for vbus
- disable-over-current: disable over current detect
- external-vbus-divider: enables off-chip resistor divider for Vbus
+- force-full-speed: limit the maximum connection speed to full-speed
Examples:
usb@02184000 { /* USB OTG */
@@ -28,4 +29,5 @@ usb@02184000 { /* USB OTG */
fsl,usbmisc = <&usbmisc 0>;
disable-over-current;
external-vbus-divider;
+ force-full-speed;
};
diff --git a/drivers/usb/chipidea/bits.h b/drivers/usb/chipidea/bits.h
index 93efe4e..4c14ab7 100644
--- a/drivers/usb/chipidea/bits.h
+++ b/drivers/usb/chipidea/bits.h
@@ -49,11 +49,13 @@
#define PORTSC_HSP BIT(9)
#define PORTSC_PTC (0x0FUL << 16)
/* PTS and PTW for non lpm version only */
+#define PORTSC_PFSC BIT(24)
#define PORTSC_PTS(d) ((((d) & 0x3) << 30) | (((d) & 0x4) ? BIT(25) : 0))
#define PORTSC_PTW BIT(28)
#define PORTSC_STS BIT(29)
/* DEVLC */
+#define DEVLC_PFSC BIT(23)
#define DEVLC_PSPD (0x03UL << 25)
#define DEVLC_PSPD_HS (0x02UL << 25)
#define DEVLC_PTW BIT(27)
diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index ae239c7..b70b1d0 100644
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -65,6 +65,7 @@
#include <linux/usb/otg.h>
#include <linux/usb/chipidea.h>
#include <linux/usb/of.h>
+#include <linux/of_device.h>
#include <linux/phy.h>
#include "ci.h"
@@ -240,6 +241,11 @@ static void hw_phymode_configure(struct ci13xxx *ci)
return;
}
+ if (of_find_property(ci->dev->of_node, "force-full-speed", NULL)) {
+ portsc |= PORTSC_PFSC;
+ lpm |= DEVLC_PFSC;
+ }
+
if (ci->hw_bank.lpm) {
hw_write(ci, OP_DEVLC, DEVLC_PTS(7) | DEVLC_PTW, lpm);
hw_write(ci, OP_DEVLC, DEVLC_STS, sts);
--
1.8.2.rc2
--
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