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Commit f78af3cc authored by Hareesh Gundu's avatar Hareesh Gundu Committed by Gerrit - the friendly Code Review server
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msm: kgsl: Ensure CX GDSC is off in SLUMBER for RGMU 



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

Change-Id: Iab437dbb54993402f5761380a6dd3779374bf687
Signed-off-by: default avatarHareesh Gundu <hareeshg@codeaurora.org>
parent f7f5b3e6

drivers/gpu/msm/kgsl_rgmu.c

+25 −2
Original line number Diff line number Diff line
@@ -191,22 +191,45 @@ static int rgmu_enable_clks(struct kgsl_device *device) 
	return 0;

}



#define CX_GDSC_TIMEOUT	5000	/* ms */

static int rgmu_disable_gdsc(struct kgsl_device *device)

{

	struct rgmu_device *rgmu = KGSL_RGMU_DEVICE(device);

	int ret = 0;

	unsigned long t;



	if (IS_ERR_OR_NULL(rgmu->cx_gdsc))

		return 0;



	ret = regulator_disable(rgmu->cx_gdsc);

	if (ret)

	if (ret) {

		dev_err(&rgmu->pdev->dev,

				"Failed to disable CX gdsc:%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 5sec

	 * timeout to ensure CX GDSC is off.

	 */

	t = jiffies + msecs_to_jiffies(CX_GDSC_TIMEOUT);

	do {

		if (!regulator_is_enabled(rgmu->cx_gdsc))

			return 0;

		usleep_range(10, 100);



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



	if (!regulator_is_enabled(rgmu->cx_gdsc))

		return 0;



	dev_err(&rgmu->pdev->dev, "RGMU CX gdsc off timeout\n");



	return -ETIMEDOUT;

}



static int rgmu_enable_gdsc(struct rgmu_device *rgmu)

{

	int ret;