From: Mika Kuoppala <mika.kuopp...@linux.intel.com>
Reading from disconnected ports will spit out timeout error
on the dmesg. Skip the attempted read if the port is not
connected and avoid confusing users/testcases about
expected timeouts.
This new dpcd debugfs entry was introduced by commit aa7471d228eb
("drm/i915: add i915 specific connector debugfs file for DPCD")
v2 by Jani: move the check at the top, out of the loop.
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=90060
Tested-by: yex.t...@intel.com
Cc: Jani Nikula <jani.nik...@intel.com>
Cc: Bob Paauwe <bob.j.paa...@intel.com>
Signed-off-by: Mika Kuoppala <mika.kuopp...@intel.com>
Signed-off-by: Jani Nikula <jani.nik...@intel.com>
---
drivers/gpu/drm/i915/i915_debugfs.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c
b/drivers/gpu/drm/i915/i915_debugfs.c
index adbbddab42c6..a32b669bab89 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -5154,6 +5154,9 @@ static int i915_dpcd_show(struct seq_file *m, void *data)
ssize_t err;
int i;
+ if (connector->status != connector_status_connected)
+ return -ENODEV;
+
for (i = 0; i < ARRAY_SIZE(i915_dpcd_debug); i++) {
const struct dpcd_block *b = &i915_dpcd_debug[i];
size_t size = b->end ? b->end - b->offset + 1 : (b->size ?: 1);
--
2.1.4
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