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usb: dwc3: add u2exit lfps quirk 

This patch adds u2exit lfps quirk, and some special platforms can configure
that if it is needed.

[ balbi@ti.com : added DeviceTree binding documentation ]

Signed-off-by: Huang Rui <ray.huang@amd.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
This commit is contained in:
Huang Rui 2014-10-28 19:54:27 +08:00 committed by Felipe Balbi
parent 80caf7d21a
commit 9a5b2f3167
4 changed files with 11 additions and 0 deletions
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1
Documentation/devicetree/bindings/usb/dwc3.txt
View File

@ -18,6 +18,7 @@ Optional properties:
Only really useful for FPGA builds.
- snps,has-lpm-erratum: true when DWC3 was configured with LPM Erratum enabled
- snps,lpm-nyet-threshold: LPM NYET threshold
- snps,u2exit_lfps_quirk: set if we want to enable u2exit lfps quirk
This is usually a subnode to DWC3 glue to which it is connected.

6
drivers/usb/dwc3/core.c
View File

@ -473,6 +473,9 @@ static int dwc3_core_init(struct dwc3 *dwc)
else
reg &= ~DWC3_GCTL_DISSCRAMBLE;
if (dwc->u2exit_lfps_quirk)
reg |= DWC3_GCTL_U2EXIT_LFPS;
/*
* WORKAROUND: DWC3 revisions <1.90a have a bug
* where the device can fail to connect at SuperSpeed
@ -729,6 +732,8 @@ static int dwc3_probe(struct platform_device *pdev)
dwc->disable_scramble_quirk = of_property_read_bool(node,
"snps,disable_scramble_quirk");
dwc->u2exit_lfps_quirk = of_property_read_bool(node,
"snps,u2exit_lfps_quirk");
} else if (pdata) {
dwc->maximum_speed = pdata->maximum_speed;
dwc->has_lpm_erratum = pdata->has_lpm_erratum;
@ -739,6 +744,7 @@ static int dwc3_probe(struct platform_device *pdev)
dwc->dr_mode = pdata->dr_mode;
dwc->disable_scramble_quirk = pdata->disable_scramble_quirk;
dwc->u2exit_lfps_quirk = pdata->u2exit_lfps_quirk;
}
/* default to superspeed if no maximum_speed passed */

3
drivers/usb/dwc3/core.h
View File

@ -166,6 +166,7 @@
#define DWC3_GCTL_SCALEDOWN(n) ((n) << 4)
#define DWC3_GCTL_SCALEDOWN_MASK DWC3_GCTL_SCALEDOWN(3)
#define DWC3_GCTL_DISSCRAMBLE (1 << 3)
#define DWC3_GCTL_U2EXIT_LFPS (1 << 2)
#define DWC3_GCTL_GBLHIBERNATIONEN (1 << 1)
#define DWC3_GCTL_DSBLCLKGTNG (1 << 0)
@ -679,6 +680,7 @@ struct dwc3_scratchpad_array {
* @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
* @u2exit_lfps_quirk: set if we enable u2exit lfps quirk
*/
struct dwc3 {
struct usb_ctrlrequest *ctrl_req;
@ -787,6 +789,7 @@ struct dwc3 {
unsigned three_stage_setup:1;
unsigned disable_scramble_quirk:1;
unsigned u2exit_lfps_quirk:1;
};
/* -------------------------------------------------------------------------- */

1
drivers/usb/dwc3/platform_data.h
View File

@ -29,4 +29,5 @@ struct dwc3_platform_data {
unsigned disable_scramble_quirk:1;
unsigned has_lpm_erratum:1;
unsigned u2exit_lfps_quirk:1;
};