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Commit b35f0ac1 authored by Harshdeep Dhatt's avatar Harshdeep Dhatt
Browse files

msm: kgsl: Handle the very first gmu boot failure 



The very first boot starts from the INIT state. If the
gmu fails to boot here, set the state to KGSL_STATE_RESET
to effect a RESET -> INIT transition where we reset the
GMU.

Change-Id: I0fddf745d299b855aab0c1989997dcab5e77954a
Signed-off-by: default avatarHarshdeep Dhatt <hdhatt@codeaurora.org>
parent f9c0b494

drivers/gpu/msm/kgsl_pwrctrl.c

+24 −17
Original line number Diff line number Diff line
@@ -1695,13 +1695,23 @@ static int _init(struct kgsl_device *device) 
	int status = 0;



	switch (device->state) {

	case KGSL_STATE_RESET:

		if (gmu_core_isenabled(device)) {

			/*

			 * If we fail a INIT -> AWARE transition, we will

			 * transition back to INIT. However, we must hard reset

			 * the GMU as we go back to INIT. This is done by

			 * forcing a RESET -> INIT transition.

			 */

			gmu_core_suspend(device);

			kgsl_pwrctrl_set_state(device, KGSL_STATE_INIT);

		}

		break;

	case KGSL_STATE_NAP:

		/* Force power on to do the stop */

		status = kgsl_pwrctrl_enable(device);

		/* fall through */

	case KGSL_STATE_ACTIVE:

		/* fall through */

	case KGSL_STATE_RESET:

		kgsl_pwrctrl_irq(device, KGSL_PWRFLAGS_OFF);

		del_timer_sync(&device->idle_timer);

		kgsl_pwrscale_midframe_timer_cancel(device);
@@ -1813,12 +1823,6 @@ _aware(struct kgsl_device *device) 
		status = gmu_core_start(device);

		break;

	case KGSL_STATE_INIT:

		/* if GMU already in FAULT */

		if (gmu_core_isenabled(device) &&

			test_bit(GMU_FAULT, &device->gmu_core.flags)) {

			status = -EINVAL;

			break;

		}

		status = kgsl_pwrctrl_enable(device);

		break;

	/* The following 3 cases shouldn't occur, but don't panic. */
@@ -1832,20 +1836,23 @@ _aware(struct kgsl_device *device) 
		break;

	case KGSL_STATE_SLUMBER:

		status = kgsl_pwrctrl_enable(device);

		if (status && gmu_core_isenabled(device))

			/*

			 * SLUMBER -> AWARE failed which means GMU boot failed.

			 * Make sure we reset the GMU while transitioning back

			 * to SLUMBER.

			 */

			kgsl_pwrctrl_set_state(device, KGSL_STATE_RESET);



		break;

	default:

		status = -EINVAL;

	}



	if (!status)

	if (status && gmu_core_isenabled(device))

		/*

		 * If a SLUMBER/INIT -> AWARE fails, we transition back to

		 * SLUMBER/INIT state. We must hard reset the GMU while

		 * transitioning back to SLUMBER/INIT. A RESET -> AWARE

		 * transition is different. It happens when dispatcher is

		 * attempting reset/recovery as part of fault handling. If it

		 * fails, we should still transition back to RESET in case

		 * we want to attempt another reset/recovery.

		 */

		kgsl_pwrctrl_set_state(device, KGSL_STATE_RESET);

	else

		kgsl_pwrctrl_set_state(device, KGSL_STATE_AWARE);



	return status;