Commit 460d098c authored by Huang Rui's avatar Huang Rui Committed by Felipe Balbi
Browse files

usb: dwc3: make HIRD threshold configurable 



HIRD threshold should be configurable by different platforms.

From DesignWare databook:
When HIRD_Threshold[4] is set to 1b1 and HIRD value is greater than or
equal to the value in HIRD_Threshold[3:0], dwc3 asserts output signals
utmi_l1_suspend_n to put PHY into Deep Low-Power mode in L1.

When HIRD_Threshold[4] is set to 1b0 or the HIRD value is less than
HIRD_Threshold[3:0], dwc3 asserts output signals utmi_sleep_n on L1.

Signed-off-by: default avatarHuang Rui <ray.huang@amd.com>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
parent 9755449d

Documentation/devicetree/bindings/usb/dwc3.txt

+3 −0
Original line number Diff line number Diff line
@@ -34,6 +34,9 @@ Optional properties: 
			LTSSM during USB3 Compliance mode.

 - snps,dis_u3_susphy_quirk: when set core will disable USB3 suspend phy.

 - snps,dis_u2_susphy_quirk: when set core will disable USB2 suspend phy.

 - snps,is-utmi-l1-suspend: true when DWC3 asserts output signal

			utmi_l1_suspend_n, false when asserts utmi_sleep_n

 - snps,hird-threshold: HIRD threshold



This is usually a subnode to DWC3 glue to which it is connected.

drivers/usb/dwc3/core.c

+17 −0
Original line number Diff line number Diff line
@@ -730,6 +730,7 @@ static int dwc3_probe(struct platform_device *pdev) 
	struct dwc3		*dwc;

	u8			lpm_nyet_threshold;

	u8			tx_de_emphasis;

	u8			hird_threshold;



	int			ret;
@@ -791,12 +792,22 @@ static int dwc3_probe(struct platform_device *pdev) 
	/* default to -3.5dB de-emphasis */

	tx_de_emphasis = 1;



	/*

	 * default to assert utmi_sleep_n and use maximum allowed HIRD

	 * threshold value of 0b1100

	 */

	hird_threshold = 12;



	if (node) {

		dwc->maximum_speed = of_usb_get_maximum_speed(node);

		dwc->has_lpm_erratum = of_property_read_bool(node,

				"snps,has-lpm-erratum");

		of_property_read_u8(node, "snps,lpm-nyet-threshold",

				&lpm_nyet_threshold);

		dwc->is_utmi_l1_suspend = of_property_read_bool(node,

				"snps,is-utmi-l1-suspend");

		of_property_read_u8(node, "snps,hird-threshold",

				&hird_threshold);



		dwc->needs_fifo_resize = of_property_read_bool(node,

				"tx-fifo-resize");
@@ -832,6 +843,9 @@ static int dwc3_probe(struct platform_device *pdev) 
		dwc->has_lpm_erratum = pdata->has_lpm_erratum;

		if (pdata->lpm_nyet_threshold)

			lpm_nyet_threshold = pdata->lpm_nyet_threshold;

		dwc->is_utmi_l1_suspend = pdata->is_utmi_l1_suspend;

		if (pdata->hird_threshold)

			hird_threshold = pdata->hird_threshold;



		dwc->needs_fifo_resize = pdata->tx_fifo_resize;

		dwc->dr_mode = pdata->dr_mode;
@@ -859,6 +873,9 @@ static int dwc3_probe(struct platform_device *pdev) 
	dwc->lpm_nyet_threshold = lpm_nyet_threshold;

	dwc->tx_de_emphasis = tx_de_emphasis;



	dwc->hird_threshold = hird_threshold

		| (dwc->is_utmi_l1_suspend << 4);



	ret = dwc3_core_get_phy(dwc);

	if (ret)

		return ret;

drivers/usb/dwc3/core.h

+6 −0
Original line number Diff line number Diff line
@@ -675,12 +675,16 @@ struct dwc3_scratchpad_array { 
 * @test_mode: true when we're entering a USB test mode

 * @test_mode_nr: test feature selector

 * @lpm_nyet_threshold: LPM NYET response threshold

 * @hird_threshold: HIRD threshold

 * @delayed_status: true when gadget driver asks for delayed status

 * @ep0_bounced: true when we used bounce buffer

 * @ep0_expect_in: true when we expect a DATA IN transfer

 * @has_hibernation: true when dwc3 was configured with Hibernation

 * @has_lpm_erratum: true when core was configured with LPM Erratum. Note that

 *			there's now way for software to detect this in runtime.

 * @is_utmi_l1_suspend: the core asserts output signal

 * 	0	- utmi_sleep_n

 * 	1	- utmi_l1_suspend_n

 * @is_selfpowered: true when we are selfpowered

 * @is_fpga: true when we are using the FPGA board

 * @needs_fifo_resize: not all users might want fifo resizing, flag it
@@ -797,12 +801,14 @@ struct dwc3 { 
	u8			test_mode;

	u8			test_mode_nr;

	u8			lpm_nyet_threshold;

	u8			hird_threshold;



	unsigned		delayed_status:1;

	unsigned		ep0_bounced:1;

	unsigned		ep0_expect_in:1;

	unsigned		has_hibernation:1;

	unsigned		has_lpm_erratum:1;

	unsigned		is_utmi_l1_suspend:1;

	unsigned		is_selfpowered:1;

	unsigned		is_fpga:1;

	unsigned		needs_fifo_resize:1;

drivers/usb/dwc3/gadget.c

+1 −5
Original line number Diff line number Diff line
@@ -2295,11 +2295,7 @@ static void dwc3_gadget_conndone_interrupt(struct dwc3 *dwc) 
		reg = dwc3_readl(dwc->regs, DWC3_DCTL);

		reg &= ~(DWC3_DCTL_HIRD_THRES_MASK | DWC3_DCTL_L1_HIBER_EN);



		/*

		 * TODO: This should be configurable. For now using

		 * maximum allowed HIRD threshold value of 0b1100

		 */

		reg |= DWC3_DCTL_HIRD_THRES(12);

		reg |= DWC3_DCTL_HIRD_THRES(dwc->hird_threshold);



		/*

		 * When dwc3 revisions >= 2.40a, LPM Erratum is enabled and

drivers/usb/dwc3/platform_data.h

+3 −0
Original line number Diff line number Diff line
@@ -25,6 +25,9 @@ struct dwc3_platform_data { 
	enum usb_dr_mode dr_mode;

	bool tx_fifo_resize;



	unsigned is_utmi_l1_suspend:1;

	u8 hird_threshold;



	u8 lpm_nyet_threshold;



	unsigned disable_scramble_quirk:1;

CRA Git | Maintained and supported by SUSTech CRA and CCSE