linux-kernel - [PATCH 4/4] drm/v3d: Skip debugfs dumping GCA on platforms without GCA.

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Message-Id: <20180928232126.4332-4-eric@anholt.net>
Date:   Fri, 28 Sep 2018 16:21:26 -0700
From:   Eric Anholt <eric@...olt.net>
To:     dri-devel@...ts.freedesktop.org
Cc:     linux-kernel@...r.kernel.org, boris.brezillon@...tlin.com,
        Eric Anholt <eric@...olt.net>
Subject: [PATCH 4/4] drm/v3d: Skip debugfs dumping GCA on platforms without GCA.

Fixes an oops reading this debugfs entry on BCM7278.

Signed-off-by: Eric Anholt <eric@...olt.net>
---
 drivers/gpu/drm/v3d/v3d_debugfs.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/v3d/v3d_debugfs.c b/drivers/gpu/drm/v3d/v3d_debugfs.c
index d48008adb085..eb2b2d2f8553 100644
--- a/drivers/gpu/drm/v3d/v3d_debugfs.c
+++ b/drivers/gpu/drm/v3d/v3d_debugfs.c
@@ -71,10 +71,13 @@ static int v3d_v3d_debugfs_regs(struct seq_file *m, void *unused)
 			   V3D_READ(v3d_hub_reg_defs[i].reg));
 	}
 
-	for (i = 0; i < ARRAY_SIZE(v3d_gca_reg_defs); i++) {
-		seq_printf(m, "%s (0x%04x): 0x%08x\n",
-			   v3d_gca_reg_defs[i].name, v3d_gca_reg_defs[i].reg,
-			   V3D_GCA_READ(v3d_gca_reg_defs[i].reg));
+	if (v3d->ver < 41) {
+		for (i = 0; i < ARRAY_SIZE(v3d_gca_reg_defs); i++) {
+			seq_printf(m, "%s (0x%04x): 0x%08x\n",
+				   v3d_gca_reg_defs[i].name,
+				   v3d_gca_reg_defs[i].reg,
+				   V3D_GCA_READ(v3d_gca_reg_defs[i].reg));
+		}
 	}
 
 	for (core = 0; core < v3d->cores; core++) {
-- 
2.18.0