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Commit 7d2b75be authored by Vamsi Krishna Samavedam's avatar Vamsi Krishna Samavedam
Browse files

usb: dwc3-msm: Reduce bus bandwidth vote based on device type 



Driver currently votes for nominal bus bandwidth to enable/support
enhanced super speed devices. Vote can be reduced when high speed
devices (such as headset) are connected to allow additional
power savings.

Change-Id: I19277f223051d322b7bdf74c629627d39ac2b801
Signed-off-by: default avatarVamsi Krishna Samavedam <vskrishn@codeaurora.org>
parent 4bbdd590

drivers/usb/dwc3/dwc3-msm.c

+61 −18
Original line number Diff line number Diff line
@@ -2113,6 +2113,60 @@ static void configure_nonpdc_usb_interrupt(struct dwc3_msm *mdwc, 
	}

}



enum bus_vote {

	BUS_VOTE_INVALID,

	BUS_VOTE_SUSPEND,

	BUS_VOTE_NOMINAL,

	BUS_VOTE_SVS

};



static int dwc3_msm_update_bus_bw(struct dwc3_msm *mdwc, enum bus_vote bv)

{

	int ret = 0;

	struct dwc3 *dwc = platform_get_drvdata(mdwc->dwc3);



	if (!mdwc->bus_perf_client)

		return 0;



	dbg_event(0xFF, "bus_vote_start", bv);



	switch (bv) {

	case BUS_VOTE_SVS:

		/* On some platforms SVS does not have separate vote. Vote for

		 * nominal if svs usecase does not exist

		 */

		if (mdwc->bus_scale_table->num_usecases == 2)

			goto nominal_vote;



		/* index starts from zero */

		ret = msm_bus_scale_client_update_request(

					mdwc->bus_perf_client, 2);

		if (ret)

			dev_err(mdwc->dev, "bus bw voting failed %d\n", ret);

		break;

	case BUS_VOTE_NOMINAL:

nominal_vote:

		ret = msm_bus_scale_client_update_request(

					mdwc->bus_perf_client, 1);

		if (ret)

			dev_err(mdwc->dev, "bus bw voting failed %d\n", ret);

		break;

	case BUS_VOTE_SUSPEND:

		ret = msm_bus_scale_client_update_request(

					mdwc->bus_perf_client, 0);

		if (ret)

			dev_err(mdwc->dev, "bus bw voting failed %d\n", ret);

		break;

	default:

		dev_err(mdwc->dev, "Unsupported bus vote:%d\n", bv);

		ret = -EINVAL;

	}



	dbg_event(0xFF, "bus_vote_end", bv);



	return ret;



}

static int dwc3_msm_suspend(struct dwc3_msm *mdwc)

{

	int ret;
@@ -2244,15 +2298,7 @@ static int dwc3_msm_suspend(struct dwc3_msm *mdwc) 
		}

	}



	/* Remove bus voting */

	if (mdwc->bus_perf_client) {

		dbg_event(0xFF, "bus_devote_start", 0);

		ret = msm_bus_scale_client_update_request(

					mdwc->bus_perf_client, 0);

		dbg_event(0xFF, "bus_devote_finish", 0);

		if (ret)

			dev_err(mdwc->dev, "bus bw unvoting failed %d\n", ret);

	}

	dwc3_msm_update_bus_bw(mdwc, BUS_VOTE_SUSPEND);



	/*

	 * release wakeup source with timeout to defer system suspend to
@@ -2310,15 +2356,10 @@ static int dwc3_msm_resume(struct dwc3_msm *mdwc) 


	pm_stay_awake(mdwc->dev);



	/* Enable bus voting */

	if (mdwc->bus_perf_client) {

		dbg_event(0xFF, "bus_vote_start", 1);

		ret = msm_bus_scale_client_update_request(

					mdwc->bus_perf_client, 1);

		dbg_event(0xFF, "bus_vote_finish", 1);

		if (ret)

			dev_err(mdwc->dev, "bus bw voting failed %d\n", ret);

	}

	if (mdwc->in_host_mode && mdwc->max_rh_port_speed == USB_SPEED_HIGH)

		dwc3_msm_update_bus_bw(mdwc, BUS_VOTE_SVS);

	else

		dwc3_msm_update_bus_bw(mdwc, BUS_VOTE_NOMINAL);



	/* Vote for TCXO while waking up USB HSPHY */

	ret = clk_prepare_enable(mdwc->xo_clk);
@@ -3530,6 +3571,7 @@ static int dwc3_msm_host_notifier(struct notifier_block *nb, 
					"set hs core clk rate %ld\n",

					mdwc->core_clk_rate_hs);

				mdwc->max_rh_port_speed = USB_SPEED_HIGH;

				dwc3_msm_update_bus_bw(mdwc, BUS_VOTE_SVS);

			} else {

				mdwc->max_rh_port_speed = USB_SPEED_SUPER;

			}
@@ -3555,6 +3597,7 @@ static int dwc3_msm_host_notifier(struct notifier_block *nb, 
			dev_dbg(mdwc->dev, "set core clk rate %ld\n",

				mdwc->core_clk_rate);

			mdwc->max_rh_port_speed = USB_SPEED_UNKNOWN;

			dwc3_msm_update_bus_bw(mdwc, BUS_VOTE_NOMINAL);

		}

	}