linux-kernel - [PATCH 5/5] drm/etnaviv: Warn when GPU doesn't idle fast enough

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Message-Id: <d30bd6f4e063bc0df1fc6d608ea93c6e08f58104.1583176306.git.agx@sigxcpu.org>
Date:   Mon,  2 Mar 2020 20:13:36 +0100
From:   Guido Günther <agx@...xcpu.org>
To:     Lucas Stach <l.stach@...gutronix.de>,
        Russell King <linux+etnaviv@...linux.org.uk>,
        Christian Gmeiner <christian.gmeiner@...il.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, etnaviv@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH 5/5] drm/etnaviv: Warn when GPU doesn't idle fast enough

If the GPU isn't idle after signalling pm_runtime_mark_last_busy() plus
waiting for the autosuspend delay there's likely something wrong with
the way we check idleness so warn about that.

Signed-off-by: Guido Günther <agx@...xcpu.org>
---
 drivers/gpu/drm/etnaviv/etnaviv_gpu.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
index da24e433f82a..4fd16b8f8a7a 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gpu.c
@@ -1824,8 +1824,11 @@ static int etnaviv_gpu_rpm_suspend(struct device *dev)
 	mask = gpu->idle_mask & ~(VIVS_HI_IDLE_STATE_FE |
 				  VIVS_HI_IDLE_STATE_MC);
 	idle = gpu_read(gpu, VIVS_HI_IDLE_STATE) & mask;
-	if (idle != mask)
+	if (idle != mask) {
+		dev_warn_ratelimited(dev, "GPU not yet idle, mask: 0x%08x\n",
+				     idle);
 		return -EBUSY;
+	}
 
 	return etnaviv_gpu_hw_suspend(gpu);
 }
-- 
2.23.0