drm/i915/lspcon: Fail LSPCON probe if the start of DPCD can't be read
All types of DP devices (eDP, DP sink, DP branch) will fail their probe
if the start of DPCD can't be read. The LSPCON PCON functionality also
depends on accessing this area, so fail the probe if the read fails.
Cc: Shashank Sharma <shashank.sharma@intel.com>
Signed-off-by: Imre Deak <imre.deak@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1477326811-30431-6-git-send-email-imre.deak@intel.com
diff --git a/drivers/gpu/drm/i915/intel_lspcon.c b/drivers/gpu/drm/i915/intel_lspcon.c
index 632149c..23b817a 100644
--- a/drivers/gpu/drm/i915/intel_lspcon.c
+++ b/drivers/gpu/drm/i915/intel_lspcon.c
@@ -131,6 +131,11 @@ bool lspcon_init(struct intel_digital_port *intel_dig_port)
}
}
+ if (!intel_dp_read_dpcd(dp)) {
+ DRM_ERROR("LSPCON DPCD read failed\n");
+ return false;
+ }
+
DRM_DEBUG_KMS("Success: LSPCON init\n");
return true;
}