First of all don't try to read dpcd if PSR is not even supported.
But also, if read failed return -EIO instead of reporting via a
backchannel.
v2: fix dev_priv: At this level m->private is the connector. (CI/DK)
don't convert dpcd read errors to EIO. (DK)
Fixes: 5b7b30864d1d ("drm/i915/psr: Split sink status into a separate debugfs node")
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@xxxxxxxxx>
Cc: José Roberto de Souza <jose.souza@xxxxxxxxx>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_debugfs.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index b3aefd623557..59dc0610ea44 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -2606,13 +2606,22 @@ static int i915_psr_sink_status_show(struct seq_file *m, void *data)
"sink internal error",
};
struct drm_connector *connector = m->private;
+ struct drm_i915_private *dev_priv = to_i915(connector->dev);
struct intel_dp *intel_dp =
enc_to_intel_dp(&intel_attached_encoder(connector)->base);
+ int ret;
+
+ if (!CAN_PSR(dev_priv)) {
+ seq_puts(m, "PSR Unsupported\n");
+ return -ENODEV;
+ }
if (connector->status != connector_status_connected)
return -ENODEV;
- if (drm_dp_dpcd_readb(&intel_dp->aux, DP_PSR_STATUS, &val) == 1) {
+ ret = drm_dp_dpcd_readb(&intel_dp->aux, DP_PSR_STATUS, &val);
+
+ if (ret == 1) {
const char *str = "unknown";
val &= DP_PSR_SINK_STATE_MASK;
@@ -2620,7 +2629,7 @@ static int i915_psr_sink_status_show(struct seq_file *m, void *data)
str = sink_status[val];
seq_printf(m, "Sink PSR status: 0x%x [%s]\n", val, str);
} else {
- DRM_ERROR("dpcd read (at %u) failed\n", DP_PSR_STATUS);
+ return ret;
}
return 0;
--
2.17.1
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