linux-kernel - [PATCH 7/7] drm/vc4: Make sure that the v3d ident debugfs has vc4's power on.

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Date:   Wed, 20 Feb 2019 13:03:43 -0800
From:   Eric Anholt <eric@...olt.net>
To:     dri-devel@...ts.freedesktop.org
Cc:     linux-kernel@...r.kernel.org,
        Paul Kocialkowski <paul.kocialkowski@...tlin.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Eric Anholt <eric@...olt.net>
Subject: [PATCH 7/7] drm/vc4: Make sure that the v3d ident debugfs has vc4's power on.

Otherwise, you sometimes decode the ident fields based on 0xdeadbeef
register reads.

Signed-off-by: Eric Anholt <eric@...olt.net>
---
 drivers/gpu/drm/vc4/vc4_v3d.c | 29 +++++++++++++++++------------
 1 file changed, 17 insertions(+), 12 deletions(-)

diff --git a/drivers/gpu/drm/vc4/vc4_v3d.c b/drivers/gpu/drm/vc4/vc4_v3d.c
index 7820b8eaaa98..36e6c7086ecf 100644
--- a/drivers/gpu/drm/vc4/vc4_v3d.c
+++ b/drivers/gpu/drm/vc4/vc4_v3d.c
@@ -108,18 +108,23 @@ static int vc4_v3d_debugfs_ident(struct seq_file *m, void *unused)
 	struct drm_info_node *node = (struct drm_info_node *)m->private;
 	struct drm_device *dev = node->minor->dev;
 	struct vc4_dev *vc4 = to_vc4_dev(dev);
-	uint32_t ident1 = V3D_READ(V3D_IDENT1);
-	uint32_t nslc = VC4_GET_FIELD(ident1, V3D_IDENT1_NSLC);
-	uint32_t tups = VC4_GET_FIELD(ident1, V3D_IDENT1_TUPS);
-	uint32_t qups = VC4_GET_FIELD(ident1, V3D_IDENT1_QUPS);
-
-	seq_printf(m, "Revision:   %d\n",
-		   VC4_GET_FIELD(ident1, V3D_IDENT1_REV));
-	seq_printf(m, "Slices:     %d\n", nslc);
-	seq_printf(m, "TMUs:       %d\n", nslc * tups);
-	seq_printf(m, "QPUs:       %d\n", nslc * qups);
-	seq_printf(m, "Semaphores: %d\n",
-		   VC4_GET_FIELD(ident1, V3D_IDENT1_NSEM));
+	int ret = vc4_v3d_pm_get(vc4);
+
+	if (ret == 0) {
+		uint32_t ident1 = V3D_READ(V3D_IDENT1);
+		uint32_t nslc = VC4_GET_FIELD(ident1, V3D_IDENT1_NSLC);
+		uint32_t tups = VC4_GET_FIELD(ident1, V3D_IDENT1_TUPS);
+		uint32_t qups = VC4_GET_FIELD(ident1, V3D_IDENT1_QUPS);
+
+		seq_printf(m, "Revision:   %d\n",
+			   VC4_GET_FIELD(ident1, V3D_IDENT1_REV));
+		seq_printf(m, "Slices:     %d\n", nslc);
+		seq_printf(m, "TMUs:       %d\n", nslc * tups);
+		seq_printf(m, "QPUs:       %d\n", nslc * qups);
+		seq_printf(m, "Semaphores: %d\n",
+			   VC4_GET_FIELD(ident1, V3D_IDENT1_NSEM));
+		vc4_v3d_pm_put(vc4);
+	}
 
 	return 0;
 }
-- 
2.20.1