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Commit 041aaac1 authored by Mayank Rana's avatar Mayank Rana Committed by Jack Pham
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usb: xhci-plat: Add DT parameter to program xhci imod_interval 



XHCI allows interrupt moderation using imod_interval at 250ns
increments. Add DT parameter to specify this imod_value for
targets mainly with single CPU to reduce CPU interrupt loads.
This allows better balance between CPU usage and performance.

CRs-fixed: 1019219
Change-Id: Id479c162da6492caff4dd83de4054fee63b6abc5
Signed-off-by: default avatarManu Gautam <mgautam@codeaurora.org>
Signed-off-by: default avatarMayank Rana <mrana@codeaurora.org>
Signed-off-by: default avatarJack Pham <jackp@codeaurora.org>
parent 15d5e755

drivers/usb/dwc3/core.c

+3 −0
Original line number Diff line number Diff line
@@ -1323,6 +1323,9 @@ static void dwc3_get_properties(struct dwc3 *dwc) 
	dwc->dis_metastability_quirk = device_property_read_bool(dev,

				"snps,dis_metastability_quirk");



	device_property_read_u32(dev, "snps,xhci-imod-value",

			&dwc->xhci_imod_value);



	dwc->lpm_nyet_threshold = lpm_nyet_threshold;

	dwc->tx_de_emphasis = tx_de_emphasis;

drivers/usb/dwc3/core.h

+2 −0
Original line number Diff line number Diff line
@@ -1032,6 +1032,7 @@ struct dwc3_scratchpad_array { 
 * @dis_metastability_quirk: set to disable metastability quirk.

 * @imod_interval: set the interrupt moderation interval in 250ns

 *                 increments or 0 to disable.

 * @xhci_imod_value: imod value to use with xhci

 */

struct dwc3 {

	struct work_struct	drd_work;
@@ -1221,6 +1222,7 @@ struct dwc3 { 
	unsigned		dis_metastability_quirk:1;



	u16			imod_interval;

	u32			xhci_imod_value;

};



#define INCRX_BURST_MODE 0

drivers/usb/dwc3/host.c

+11 −1
Original line number Diff line number Diff line
@@ -43,12 +43,13 @@ static int dwc3_host_get_irq(struct dwc3 *dwc) 


int dwc3_host_init(struct dwc3 *dwc)

{

	struct property_entry	props[4];

	struct property_entry	props[5];

	struct platform_device	*xhci;

	int			ret, irq;

	struct resource		*res;

	struct platform_device	*dwc3_pdev = to_platform_device(dwc->dev);

	int			prop_idx = 0;

	struct property_entry	imod_prop;



	irq = dwc3_host_get_irq(dwc);

	if (irq < 0)
@@ -93,6 +94,15 @@ int dwc3_host_init(struct dwc3 *dwc) 
	if (dwc->usb2_lpm_disable)

		props[prop_idx++].name = "usb2-lpm-disable";



	if (dwc->xhci_imod_value) {

		imod_prop.name  = "imod-interval-ns";

		imod_prop.length  = sizeof(u32);

		imod_prop.is_array = false;

		imod_prop.type = DEV_PROP_U32;

		imod_prop.value.u32_data = dwc->xhci_imod_value;

		props[prop_idx++] = imod_prop;

	}



	/**

	 * WORKAROUND: dwc3 revisions <=3.00a have a limitation

	 * where Port Disable command doesn't work.