@@ -14,6 +14,8 @@ Optional properties:
- phys: from the *Generic PHY* bindings
- phy-names: from the *Generic PHY* bindings
- tx-fifo-resize: determines if the FIFO *has* to be reallocated.
+ - snps,disable_scramble_quirk: true when SW should disable data scrambling.
+ Only really useful for FPGA builds.
This is usually a subnode to DWC3 glue to which it is connected.
@@ -422,7 +422,6 @@ static int dwc3_core_init(struct dwc3 *dwc)
reg = dwc3_readl(dwc->regs, DWC3_GCTL);
reg &= ~DWC3_GCTL_SCALEDOWN_MASK;
- reg &= ~DWC3_GCTL_DISSCRAMBLE;
switch (DWC3_GHWPARAMS1_EN_PWROPT(dwc->hwparams.hwparams1)) {
case DWC3_GHWPARAMS1_EN_PWROPT_CLK:
@@ -466,6 +465,11 @@ static int dwc3_core_init(struct dwc3 *dwc)
dwc->is_fpga = true;
}
+ if (dwc->disable_scramble_quirk && dwc->is_fpga)
+ reg |= DWC3_GCTL_DISSCRAMBLE;
+ else
+ reg &= ~DWC3_GCTL_DISSCRAMBLE;
+
/*
* WORKAROUND: DWC3 revisions <1.90a have a bug
* where the device can fail to connect at SuperSpeed
@@ -710,11 +714,16 @@ static int dwc3_probe(struct platform_device *pdev)
dwc->needs_fifo_resize = of_property_read_bool(node, "tx-fifo-resize");
dwc->dr_mode = of_usb_get_dr_mode(node);
+
+ dwc->disable_scramble_quirk = of_property_read_bool(node,
+ "snps,disable_scramble_quirk");
} else if (pdata) {
dwc->maximum_speed = pdata->maximum_speed;
dwc->needs_fifo_resize = pdata->tx_fifo_resize;
dwc->dr_mode = pdata->dr_mode;
+
+ dwc->disable_scramble_quirk = pdata->disable_scramble_quirk;
}
/* default to superspeed if no maximum_speed passed */
@@ -672,6 +672,7 @@ struct dwc3_scratchpad_array {
* @setup_packet_pending: true when there's a Setup Packet in FIFO. Workaround
* @start_config_issued: true when StartConfig command has been issued
* @three_stage_setup: set if we perform a three phase setup
+ * @disable_scramble_quirk: set if we enable the disable scramble quirk
*/
struct dwc3 {
struct usb_ctrlrequest *ctrl_req;
@@ -776,6 +777,8 @@ struct dwc3 {
unsigned setup_packet_pending:1;
unsigned start_config_issued:1;
unsigned three_stage_setup:1;
+
+ unsigned disable_scramble_quirk:1;
};
/* -------------------------------------------------------------------------- */
@@ -24,4 +24,6 @@ struct dwc3_platform_data {
enum usb_device_speed maximum_speed;
enum usb_dr_mode dr_mode;
bool tx_fifo_resize;
+
+ unsigned disable_scramble_quirk:1;
};