drm/v3d: Skip debugfs dumping GCA on platforms without GCA.

commit 2f20fa8d12e859a03f68bdd81d75830141bc9ac9 upstream.

Fixes an oops reading this debugfs entry on BCM7278.

Signed-off-by: Eric Anholt <eric@anholt.net>
Link: https://patchwork.freedesktop.org/patch/msgid/20180928232126.4332-4-eric@anholt.net
Fixes: 57692c94dcbe ("drm/v3d: Introduce a new DRM driver for Broadcom V3D V3.x+")
Cc: <stable@vger.kernel.org>
Reviewed-by: Boris Brezillon <boris.brezillon@bootlin.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/gpu/drm/v3d/v3d_debugfs.c b/drivers/gpu/drm/v3d/v3d_debugfs.c
index 4db62c5..26470c7 100644 (file)
--- 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++) {