[PATCH] drm/msm/adreno/a6xx: Set the GPU frequency after turning on the GMU

From: Jordan Crouse <jcrouse-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
To: robdclark-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org,
	freedreno-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
Cc: linux-arm-msm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: [PATCH] drm/msm/adreno/a6xx: Set the GPU frequency after turning on the GMU
Date: Fri,  3 Aug 2018 15:06:06 -0600	[thread overview]
Message-ID: <20180803210606.15363-1-jcrouse@codeaurora.org> (raw)

Set the correct initial GPU frequency on the GMU just after turning on
or resetting the GMU so it doesn't keep running at a horribly slow
speed.

Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
---
 drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
index c49ca275a3b3..f8227f38b8cd 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
@@ -65,6 +65,26 @@ static bool a6xx_gmu_gx_is_on(struct a6xx_gmu *gmu)
 		A6XX_GMU_SPTPRAC_PWR_CLK_STATUS_GX_HM_CLK_OFF));
 }
 
+static int a6xx_gmu_set_freq(struct a6xx_gmu *gmu, int index)
+{
+	gmu_write(gmu, REG_A6XX_GMU_DCVS_ACK_OPTION, 0);
+
+	gmu_write(gmu, REG_A6XX_GMU_DCVS_PERF_SETTING,
+		((index << 24) & 0xff) | (3 & 0xf));
+
+	/*
+	 * Send an invalid index as a vote for the bus bandwidth and let the
+	 * firmware decide on the right vote
+	 */
+	gmu_write(gmu, REG_A6XX_GMU_DCVS_BW_SETTING, 0xff);
+
+	/* Set and clear the OOB for DCVS to trigger the GMU */
+	a6xx_gmu_set_oob(gmu, GMU_OOB_DCVS_SET);
+	a6xx_gmu_clear_oob(gmu, GMU_OOB_DCVS_SET);
+
+	return gmu_read(gmu, REG_A6XX_GMU_DCVS_RETURN);
+}
+
 static bool a6xx_gmu_check_idle_level(struct a6xx_gmu *gmu)
 {
 	u32 val;
@@ -602,6 +622,9 @@ int a6xx_gmu_reset(struct a6xx_gpu *a6xx_gpu)
 	if (!ret)
 		ret = a6xx_hfi_start(gmu, GMU_COLD_BOOT);
 
+	/* Set the GPU back to the highest power frequency */
+	a6xx_gmu_set_freq(gmu, gmu->nr_gpu_freqs - 1);
+
 	if (ret)
 		a6xx_gmu_clear_oob(gmu, GMU_OOB_BOOT_SLUMBER);
 
@@ -635,6 +658,9 @@ int a6xx_gmu_resume(struct a6xx_gpu *a6xx_gpu)
 
 	ret = a6xx_hfi_start(gmu, status);
 
+	/* Set the GPU to the highest power frequency */
+	a6xx_gmu_set_freq(gmu, gmu->nr_gpu_freqs - 1);
+
 out:
 	/* Make sure to turn off the boot OOB request on error */
 	if (ret)
-- 
2.18.0

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