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Commit a854ce5b authored by Ajay Agarwal's avatar Ajay Agarwal
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usb: dwc3-msm: Add support for interrupt moderation in device mode 



Add support for interrupt moderation in device mode to ensure
minimum time interval between core interrupts.

Use the module parameter 'dwc3_gadget_imod_val' as follows:

 To enable/modify moderation value:
  - Disconnect the peripheral cable
  - echo <imod_val> > /sys/module/dwc3_msm/parameters/dwc3_gadget_imod_val
  - Start gadget by connecting peripheral cable.
  - Moderation will be enabled/modified.

 To disable interrupt moderation:
  - echo 0 > /sys/module/dwc3_msm/parameters/dwc3_gadget_imod_val
  - Start gadget by connecting peripheral cable.
  - Moderation will be disabled.

Change-Id: Ic6189ef98d9003303332450afc67ed29413307be
Signed-off-by: default avatarAjay Agarwal <ajaya@codeaurora.org>
parent b7401f45

drivers/usb/dwc3/dwc3-msm.c

+25 −0
Original line number Diff line number Diff line
@@ -71,6 +71,12 @@ static int cpu_to_affin; 
module_param(cpu_to_affin, int, S_IRUGO|S_IWUSR);

MODULE_PARM_DESC(cpu_to_affin, "affin usb irq to this cpu");



/* Interrupt moderation for normal endpoints */

static unsigned int dwc3_gadget_imod_val;

module_param(dwc3_gadget_imod_val, int, 0644);

MODULE_PARM_DESC(dwc3_gadget_imod_val,

			"Interrupt moderation in usecs for normal EPs");



/* XHCI registers */

#define USB3_HCSPARAMS1		(0x4)

#define USB3_HCCPARAMS2		(0x1c)
@@ -120,6 +126,12 @@ MODULE_PARM_DESC(cpu_to_affin, "affin usb irq to this cpu"); 
#define GSI_RING_BASE_ADDR_L(n)	((QSCRATCH_REG_OFFSET + 0x130) + (n*4))

#define GSI_RING_BASE_ADDR_H(n)	((QSCRATCH_REG_OFFSET + 0x144) + (n*4))



#define IMOD(n)			((QSCRATCH_REG_OFFSET + 0x170) + (n*4))

#define IMOD_EE_EN_MASK		BIT(12)

#define IMOD_EE_CNT_MASK	0x7FF



#define USEC_CNT	(QSCRATCH_REG_OFFSET + 0x180)



#define	GSI_IF_STS	(QSCRATCH_REG_OFFSET + 0x1A4)

#define	GSI_WR_CTRL_STATE_MASK	BIT(15)
@@ -4405,9 +4417,22 @@ static int dwc3_otg_start_peripheral(struct dwc3_msm *mdwc, int on) 
		msm_dwc3_perf_vote_update(mdwc, true);

		schedule_delayed_work(&mdwc->perf_vote_work,

				msecs_to_jiffies(1000 * PM_QOS_SAMPLE_SEC));

		if (dwc3_gadget_imod_val > 0) {

			dwc3_msm_write_reg(mdwc->base, USEC_CNT, 0x7D);

			dwc3_msm_write_reg_field(mdwc->base, IMOD(0),

						 IMOD_EE_CNT_MASK,

						 dwc3_gadget_imod_val);

			dwc3_msm_write_reg_field(mdwc->base, IMOD(0),

						 IMOD_EE_EN_MASK, 0x1);

		}

	} else {

		dev_dbg(mdwc->dev, "%s: turn off gadget %s\n",

					__func__, dwc->gadget.name);

		dwc3_msm_write_reg_field(mdwc->base, IMOD(0),

					 IMOD_EE_EN_MASK, 0x0);

		dwc3_msm_write_reg_field(mdwc->base, IMOD(0),

					 IMOD_EE_CNT_MASK, 0x0);

		dwc3_msm_write_reg(mdwc->base, USEC_CNT, 0x0);

		cancel_delayed_work_sync(&mdwc->perf_vote_work);

		msm_dwc3_perf_vote_update(mdwc, false);

		pm_qos_remove_request(&mdwc->pm_qos_req_dma);