Commit 8da76444 authored by Wesley Cheng's avatar Wesley Cheng Committed by Greg Kroah-Hartman
Browse files

usb: dwc3: Specify maximum number of XHCI interrupters 



Allow for the DWC3 host driver to pass along XHCI property that defines
how many interrupters to allocate.  This is in relation for the number of
event rings that can be potentially used by other processors within the
system.

Acked-by: default avatarThinh Nguyen <Thinh.Nguyen@synopsys.com>
Tested-by: default avatarPuma Hsu <pumahsu@google.com>
Tested-by: default avatarDaehwan Jung <dh10.jung@samsung.com>
Signed-off-by: default avatarWesley Cheng <quic_wcheng@quicinc.com>
Acked-by: default avatarMark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20250409194804.3773260-7-quic_wcheng@quicinc.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent b85a2ebd

drivers/usb/dwc3/core.c

+12 −0
Original line number Diff line number Diff line
@@ -1699,6 +1699,7 @@ static void dwc3_get_properties(struct dwc3 *dwc) 
	u8			tx_thr_num_pkt_prd = 0;

	u8			tx_max_burst_prd = 0;

	u8			tx_fifo_resize_max_num;

	u16			num_hc_interrupters;



	/* default to highest possible threshold */

	lpm_nyet_threshold = 0xf;
@@ -1719,6 +1720,9 @@ static void dwc3_get_properties(struct dwc3 *dwc) 
	 */

	tx_fifo_resize_max_num = 6;



	/* default to a single XHCI interrupter */

	num_hc_interrupters = 1;



	dwc->maximum_speed = usb_get_maximum_speed(dev);

	dwc->max_ssp_rate = usb_get_maximum_ssp_rate(dev);

	dwc->dr_mode = usb_get_dr_mode(dev);
@@ -1765,6 +1769,12 @@ static void dwc3_get_properties(struct dwc3 *dwc) 
				&tx_thr_num_pkt_prd);

	device_property_read_u8(dev, "snps,tx-max-burst-prd",

				&tx_max_burst_prd);

	device_property_read_u16(dev, "num-hc-interrupters",

				 &num_hc_interrupters);

	/* DWC3 core allowed to have a max of 8 interrupters */

	if (num_hc_interrupters > 8)

		num_hc_interrupters = 8;



	dwc->do_fifo_resize = device_property_read_bool(dev,

							"tx-fifo-resize");

	if (dwc->do_fifo_resize)
@@ -1851,6 +1861,8 @@ static void dwc3_get_properties(struct dwc3 *dwc) 
	dwc->tx_max_burst_prd = tx_max_burst_prd;



	dwc->tx_fifo_resize_max_num = tx_fifo_resize_max_num;



	dwc->num_hc_interrupters = num_hc_interrupters;

}



/* check whether the core supports IMOD */

drivers/usb/dwc3/core.h

+2 −0
Original line number Diff line number Diff line
@@ -1083,6 +1083,7 @@ struct dwc3_scratchpad_array { 
 * @tx_max_burst_prd: max periodic ESS transmit burst size

 * @tx_fifo_resize_max_num: max number of fifos allocated during txfifo resize

 * @clear_stall_protocol: endpoint number that requires a delayed status phase

 * @num_hc_interrupters: number of host controller interrupters

 * @hsphy_interface: "utmi" or "ulpi"

 * @connected: true when we're connected to a host, false otherwise

 * @softconnect: true when gadget connect is called, false when disconnect runs
@@ -1330,6 +1331,7 @@ struct dwc3 { 
	u8			tx_max_burst_prd;

	u8			tx_fifo_resize_max_num;

	u8			clear_stall_protocol;

	u16			num_hc_interrupters;



	const char		*hsphy_interface;

drivers/usb/dwc3/host.c

+3 −0
Original line number Diff line number Diff line
@@ -182,6 +182,9 @@ int dwc3_host_init(struct dwc3 *dwc) 
	if (DWC3_VER_IS_WITHIN(DWC3, ANY, 300A))

		props[prop_idx++] = PROPERTY_ENTRY_BOOL("quirk-broken-port-ped");



	props[prop_idx++] = PROPERTY_ENTRY_U16("num-hc-interrupters",

					       dwc->num_hc_interrupters);



	if (prop_idx) {

		ret = device_create_managed_software_node(&xhci->dev, props, NULL);

		if (ret) {