- DWC_USB3_NUM indicates the number of Device mode single directional
endpoints, including OUT and IN endpoint 0.
- DWC_USB3_NUM_IN_EPS indicates the maximum number of Device mode IN
endpoints active at any time, including control endpoint 0.
It's possible to configure RTL such that DWC_USB3_NUM_EPS is equal to
DWC_USB3_NUM_IN_EPS.
dwc3-core calculates the number of OUT endpoints as DWC_USB3_NUM minus
DWC_USB3_NUM_IN_EPS. If RTL has been configured with DWC_USB3_NUM_IN_EPS
equal to DWC_USB3_NUM then dwc3-core will calculate the number of OUT
endpoints as zero.
For example a from dwc3_core_num_eps() shows:
[ 1.565000] /usb0@f01d0000: found 8 IN and 0 OUT endpoints
This patch fixes this case by adding a snps,num_in_eps quirk and an
over-ride value for DWC_USB3_NUM_IN_EPS snps,num_in_eps_override. When the
quirk is declared then snps,num_in_eps_override will be used instead of
DWC_USB3_NUM_IN_EPS as the value of the number active IN endpoints.
The minimum value specified for DWC_USB3_NUM_IN_EPS in the Designware
data-book is two, if snps,num_in_eps_quirk is declared but
snps,num_in_eps_override is omitted, then the minimum value will be used as
the default.
Signed-off-by: Bryan O'Donoghue <pure.logic@xxxxxxxxxxxxxxxxx>
---
Documentation/devicetree/bindings/usb/dwc3.txt | 3 +++
drivers/usb/dwc3/core.c | 11 +++++++++++
drivers/usb/dwc3/core.h | 6 ++++++
3 files changed, 20 insertions(+)
diff --git a/Documentation/devicetree/bindings/usb/dwc3.txt b/Documentation/devicetree/bindings/usb/dwc3.txt
index e3e6983..bb383bf 100644
--- a/Documentation/devicetree/bindings/usb/dwc3.txt
+++ b/Documentation/devicetree/bindings/usb/dwc3.txt
@@ -55,6 +55,9 @@ Optional properties:
fladj_30mhz_sdbnd signal is invalid or incorrect.
- <DEPRECATED> tx-fifo-resize: determines if the FIFO *has* to be reallocated.
+ - snps,num_in_eps_quirk: when set core will over-ride the num_in_eps value.
+ - snps,num_in_eps_override: the value that will be used for num_in_eps when
+ num_in_eps_quirk is true
This is usually a subnode to DWC3 glue to which it is connected.
diff --git a/drivers/usb/dwc3/core.c b/drivers/usb/dwc3/core.c
index 369bab1..d5e472a 100644
--- a/drivers/usb/dwc3/core.c
+++ b/drivers/usb/dwc3/core.c
@@ -398,6 +398,8 @@ static void dwc3_core_num_eps(struct dwc3 *dwc)
struct dwc3_hwparams *parms = &dwc->hwparams;
dwc->num_in_eps = DWC3_NUM_IN_EPS(parms);
+ if (dwc->num_in_eps_quirk)
+ dwc->num_in_eps = dwc->num_in_eps_override;
dwc->num_out_eps = DWC3_NUM_EPS(parms) - dwc->num_in_eps;
}
@@ -908,6 +910,7 @@ static void dwc3_get_properties(struct dwc3 *dwc)
struct device *dev = dwc->dev;
u8 lpm_nyet_threshold;
u8 tx_de_emphasis;
+ u8 num_in_eps_override;
u8 hird_threshold;
/* default to highest possible threshold */
@@ -922,6 +925,9 @@ static void dwc3_get_properties(struct dwc3 *dwc)
*/
hird_threshold = 12;
+ /* default value of 2 is the minimum RTL parameter value */
+ num_in_eps_override = 2;
+
dwc->maximum_speed = usb_get_maximum_speed(dev);
dwc->dr_mode = usb_get_dr_mode(dev);
dwc->hsphy_mode = of_usb_get_phy_mode(dev->of_node);
@@ -981,9 +987,14 @@ static void dwc3_get_properties(struct dwc3 *dwc)
&dwc->hsphy_interface);
device_property_read_u32(dev, "snps,quirk-frame-length-adjustment",
&dwc->fladj);
+ dwc->num_in_eps_quirk = device_property_read_bool(dev,
+ "snps,num_in_eps_quirk");
+ device_property_read_u8(dev, "snps,num_in_eps_override",
+ &num_in_eps_override);
dwc->lpm_nyet_threshold = lpm_nyet_threshold;
dwc->tx_de_emphasis = tx_de_emphasis;
+ dwc->num_in_eps_override = num_in_eps_override;
dwc->hird_threshold = hird_threshold
| (dwc->is_utmi_l1_suspend << 4);
diff --git a/drivers/usb/dwc3/core.h b/drivers/usb/dwc3/core.h
index 14b7602..3fe6dfc 100644
--- a/drivers/usb/dwc3/core.h
+++ b/drivers/usb/dwc3/core.h
@@ -853,6 +853,9 @@ struct dwc3_scratchpad_array {
* 3 - Reserved
* @imod_interval: set the interrupt moderation interval in 250ns
* increments or 0 to disable.
+ * @num_in_eps_quirk: set if silicon reports number of device-mode IN endpoints
+ * as equal to equal to the total number of endpoints.
+ * @num_in_eps_override: The value to set the number of IN endpoints to.
*/
struct dwc3 {
struct usb_ctrlrequest *ctrl_req;
@@ -1003,6 +1006,9 @@ struct dwc3 {
unsigned tx_de_emphasis:2;
u16 imod_interval;
+
+ unsigned num_in_eps_quirk:1;
+ unsigned num_in_eps_override:6;
};
/* -------------------------------------------------------------------------- */
--
2.7.4
--
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