Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit 433b0c79 authored by George Shen's avatar George Shen
Browse files

msm: kgsl: Ensure GFX CX GDSC off in SLUMBER 



Polls CX GDSC status to ensure it's off before transitioning
to SLUMBER (GPU power collapse) state.

CRs-Fixed: 2017390
Change-Id: I7594f8d5ddec00bdb7cc90a5000e963e56065f9b
Signed-off-by: default avatarGeorge Shen <sqiao@codeaurora.org>
parent 92b0fef6

drivers/gpu/msm/kgsl_gmu.c

+21 −2
Original line number Diff line number Diff line
@@ -1238,21 +1238,40 @@ static int gmu_enable_gdsc(struct gmu_device *gmu) 
	return ret;

}



#define CX_GDSC_TIMEOUT	10	/* ms */

static int gmu_disable_gdsc(struct gmu_device *gmu)

{

	int ret;

	unsigned long t;



	if (IS_ERR_OR_NULL(gmu->cx_gdsc))

		return 0;



	ret = regulator_disable(gmu->cx_gdsc);

	if (ret)

	if (ret) {

		dev_err(&gmu->pdev->dev,

			"Failed to disable GMU CX gdsc, error %d\n", ret);



		return ret;

	}



	/*

	 * After GX GDSC is off, CX GDSC must be off

	 * Voting off alone from GPU driver cannot

	 * Guarantee CX GDSC off. Polling with 10ms

	 * timeout to ensure

	 */

	t = jiffies + msecs_to_jiffies(CX_GDSC_TIMEOUT);

	do {

		if (!regulator_is_enabled(gmu->cx_gdsc))

			return 0;

		udelay(100);



	} while (!(time_after(jiffies, t)));



	dev_err(&gmu->pdev->dev, "GMU CX gdsc off timeout");

	return -ETIMEDOUT;

}



static int gmu_fast_boot(struct kgsl_device *device)

{

	int ret;