The DPRX/LTTPR caps for DP is read on detect and should be read only once. This value is stored in intl_dp struct and will be retained until hotplug.
Signed-off-by: Arun R Murthy <[email protected]> --- drivers/gpu/drm/i915/display/intel_dp_link_training.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/i915/display/intel_dp_link_training.c b/drivers/gpu/drm/i915/display/intel_dp_link_training.c index 76a5bfb507c34733db09cd7c2ba9895afcbf6b10..b78fc69cf21dea630313a5c93ff4bd3670f32293 100644 --- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c +++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c @@ -250,6 +250,9 @@ int intel_dp_init_lttpr_and_dprx_caps(struct intel_dp *intel_dp) struct intel_display *display = to_intel_display(intel_dp); int lttpr_count = 0; + /* this function is meant to be called only once */ + drm_WARN_ON(display->drm, intel_dp->dpcd[DP_DPCD_REV] != 0); + /* * Detecting LTTPRs must be avoided on platforms with an AUX timeout * period < 3.2ms. (see DP Standard v2.0, 2.11.2, 3.6.6.1). -- 2.25.1
