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Commit 8ceb73a8 authored by Vijayavardhan Vennapusa's avatar Vijayavardhan Vennapusa
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USB: phy-msm: Add support for limiting type-c charging current for SDP 



There are some bad type-c to standard A cables which are not compliant
to type-c specification. When these cables are used to connect to legacy
Host PCs, Pericom type-c chip might detect charging current as 3A. Due to
this, USB driver notifies PMIC to draw with 3A and results in PMIC drawing
more current than 500mA provided by legacy host. Hence fix this by having
support for limiting type-c charging current to 500mA in case of SDP
CHARGERs to avoid power surge issues on legacy hosts.

Change-Id: I480afd49ecd297f835b7c01d10e7431374e5a580
Signed-off-by: default avatarVijayavardhan Vennapusa <vvreddy@codeaurora.org>
parent 58be1b1f

Documentation/devicetree/bindings/usb/msm-hsusb.txt

+2 −0
Original line number Diff line number Diff line
@@ -168,6 +168,8 @@ Optional properties : 
	devicetree/bindings/usb/android-dev.txt for details about "streaming-func" property.

- qcom,axi-prefetch-enable: If present, AXI64 interface will be used for transferring data

       to/from DDR by controller.

- qcom,enable-sdp-typec-current-limit: Indicates whether type-c current for SDP CHARGER to

	be limited.



Example HSUSB OTG controller device node :

	usb@f9690000 {

drivers/usb/phy/phy-msm-usb.c

+26 −1
Original line number Diff line number Diff line
@@ -1746,6 +1746,7 @@ static void msm_otg_set_online_status(struct msm_otg *motg) 
static void msm_otg_notify_charger(struct msm_otg *motg, unsigned mA)

{

	struct usb_gadget *g = motg->phy.otg->gadget;

	struct msm_otg_platform_data *pdata = motg->pdata;



	if (g && g->is_a_peripheral)

		return;
@@ -1755,6 +1756,16 @@ static void msm_otg_notify_charger(struct msm_otg *motg, unsigned mA) 
	/* Save bc1.2 max_curr if type-c charger later moves to diff mode */

	motg->bc1p2_current_max = mA;



	/*

	 * Limit type-c charger current to 500 for SDP charger to avoid more

	 * current drawn than 500 with Hosts that don't support type C due to

	 * non compliant type-c to standard A cables.

	 */

	if (pdata->enable_sdp_typec_current_limit &&

			(motg->chg_type == USB_SDP_CHARGER) &&

					motg->typec_current_max > 500)

		motg->typec_current_max = 500;



	/* Override mA if type-c charger used (use hvdcp/bc1.2 if it is 500) */

	if (motg->typec_current_max > 500 && mA < motg->typec_current_max)

		mA = motg->typec_current_max;
@@ -3379,6 +3390,7 @@ static int otg_power_set_property_usb(struct power_supply *psy, 
				  const union power_supply_propval *val)

{

	struct msm_otg *motg = container_of(psy, struct msm_otg, usb_psy);

	struct msm_otg_platform_data *pdata = motg->pdata;



	msm_otg_dbg_log_event(&motg->phy, "SET PWR PROPERTY", psp, psy->type);

	switch (psp) {
@@ -3405,7 +3417,17 @@ static int otg_power_set_property_usb(struct power_supply *psy, 
		motg->current_max = val->intval;

		break;

	case POWER_SUPPLY_PROP_INPUT_CURRENT_MAX:

		/*

		 * Limit type-c charger current to 500 for SDP charger

		 * to avoid more current drawn than 500 with legacy Hosts.

		 */

		if (pdata->enable_sdp_typec_current_limit &&

				(motg->chg_type == USB_SDP_CHARGER)

					&& val->intval > 500)

			motg->typec_current_max = 500;

		else

			motg->typec_current_max = val->intval;



		msm_otg_dbg_log_event(&motg->phy, "type-c charger",

					val->intval, motg->bc1p2_current_max);

		/* Update chg_current as per type-c charger detection on VBUS */
@@ -4076,6 +4098,9 @@ struct msm_otg_platform_data *msm_otg_dt_to_pdata(struct platform_device *pdev) 


	pdata->enable_axi_prefetch = of_property_read_bool(node,

						"qcom,axi-prefetch-enable");



	pdata->enable_sdp_typec_current_limit = of_property_read_bool(node,

					"qcom,enable-sdp-typec-current-limit");

	return pdata;

}

include/linux/usb/msm_hsusb.h

+3 −0
Original line number Diff line number Diff line
@@ -268,6 +268,8 @@ enum usb_id_state { 
 * @bool enable_streaming: Indicates whether streaming to be enabled by default.

 * @bool enable_axi_prefetch: Indicates whether AXI Prefetch interface is used

		for improving data performance.

 * @bool enable_sdp_typec_current_limit: Indicates whether type-c current for

		sdp charger to be limited.

 */

struct msm_otg_platform_data {

	int *phy_init_seq;
@@ -308,6 +310,7 @@ struct msm_otg_platform_data { 
	bool emulation;

	bool enable_streaming;

	bool enable_axi_prefetch;

	bool enable_sdp_typec_current_limit;

	struct clk *system_clk;

};