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Commit 70213109 authored by Elson Roy Serrao's avatar Elson Roy Serrao
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usb: dwc3-msm: Add orientation setting capablity via sysfs 



For SuperSpeed electrical compliance testing it is required
to configure the port in host mode prior to connecting the
Type-C fixture. However host mode in unplugged scenario always
assumes lane A orientation. Add a sysfs entry to configure
the orientation as per the requirement.

Lane can be configured using below commands.
Lane A:echo A  > /sys/bus/platform/devices/a600000.ssusb/orientation
Lane B:echo B  > /sys/bus/platform/devices/a600000.ssusb/orientation
Any other value will reset the orientation setting to default
behavior.

Change-Id: I736119f642204272d291c63ad19322bf043c3923
Signed-off-by: default avatarElson Roy Serrao <eserrao@codeaurora.org>
parent 3a9eb4f4

drivers/usb/dwc3/dwc3-msm.c

+36 −2
Original line number Diff line number Diff line
@@ -345,6 +345,7 @@ struct dwc3_msm { 


	u64			dummy_gsi_db;

	dma_addr_t		dummy_gsi_db_dma;

	int			orientation_override;

};



#define USB_HSPHY_3P3_VOL_MIN		3050000 /* uV */
@@ -2680,9 +2681,11 @@ static int dwc3_msm_resume(struct dwc3_msm *mdwc) 
	if (dwc->maximum_speed >= USB_SPEED_SUPER &&

			mdwc->lpm_flags & MDWC3_SS_PHY_SUSPEND) {

		mdwc->ss_phy->flags &= ~(PHY_LANE_A | PHY_LANE_B);

		if (mdwc->typec_orientation == ORIENTATION_CC1)

		if (mdwc->orientation_override)

			mdwc->ss_phy->flags |= mdwc->orientation_override;

		else if (mdwc->typec_orientation == ORIENTATION_CC1)

			mdwc->ss_phy->flags |= PHY_LANE_A;

		if (mdwc->typec_orientation == ORIENTATION_CC2)

		else if (mdwc->typec_orientation == ORIENTATION_CC2)

			mdwc->ss_phy->flags |= PHY_LANE_B;

		usb_phy_set_suspend(mdwc->ss_phy, 0);

		mdwc->ss_phy->flags &= ~DEVICE_IN_SS_MODE;
@@ -3247,6 +3250,36 @@ static int dwc3_msm_extcon_register(struct dwc3_msm *mdwc) 
	return 0;

}



static ssize_t orientation_show(struct device *dev,

		struct device_attribute *attr, char *buf)

{

	struct dwc3_msm *mdwc = dev_get_drvdata(dev);



	if (mdwc->orientation_override == PHY_LANE_A)

		return scnprintf(buf, PAGE_SIZE, "A\n");

	if (mdwc->orientation_override == PHY_LANE_B)

		return scnprintf(buf, PAGE_SIZE, "B\n");



	return scnprintf(buf, PAGE_SIZE, "none\n");

}



static ssize_t orientation_store(struct device *dev,

		struct device_attribute *attr, const char *buf, size_t count)

{

	struct dwc3_msm *mdwc = dev_get_drvdata(dev);



	if (sysfs_streq(buf, "A"))

		mdwc->orientation_override = PHY_LANE_A;

	else if (sysfs_streq(buf, "B"))

		mdwc->orientation_override = PHY_LANE_B;

	else

		mdwc->orientation_override = ORIENTATION_NONE;



	return count;

}



static DEVICE_ATTR_RW(orientation);



static ssize_t mode_show(struct device *dev, struct device_attribute *attr,

		char *buf)

{
@@ -3801,6 +3834,7 @@ static int dwc3_msm_probe(struct platform_device *pdev) 
		dwc3_ext_event_notify(mdwc);

	}



	device_create_file(&pdev->dev, &dev_attr_orientation);

	device_create_file(&pdev->dev, &dev_attr_mode);

	device_create_file(&pdev->dev, &dev_attr_speed);

	device_create_file(&pdev->dev, &dev_attr_usb_compliance_mode);