diff options
Diffstat (limited to 'drivers/gpu/drm/i915/display/intel_dp_link_training.c')
| -rw-r--r-- | drivers/gpu/drm/i915/display/intel_dp_link_training.c | 33 |
1 files changed, 17 insertions, 16 deletions
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 26f9e2b748e4..9feaf1a589f3 100644 --- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c +++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c @@ -82,19 +82,8 @@ static bool intel_dp_read_lttpr_common_caps(struct intel_dp *intel_dp, const u8 dpcd[DP_RECEIVER_CAP_SIZE]) { struct intel_encoder *encoder = &dp_to_dig_port(intel_dp)->base; - struct drm_i915_private *i915 = to_i915(encoder->base.dev); int ret; - if (intel_dp_is_edp(intel_dp)) - return false; - - /* - * 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). - */ - if (DISPLAY_VER(i915) < 10 || IS_GEMINILAKE(i915)) - return false; - ret = drm_dp_read_lttpr_common_caps(&intel_dp->aux, dpcd, intel_dp->lttpr_common_caps); if (ret < 0) @@ -197,13 +186,25 @@ static int intel_dp_init_lttpr(struct intel_dp *intel_dp, const u8 dpcd[DP_RECEI */ int intel_dp_init_lttpr_and_dprx_caps(struct intel_dp *intel_dp) { - u8 dpcd[DP_RECEIVER_CAP_SIZE]; - int lttpr_count; + struct drm_i915_private *i915 = dp_to_i915(intel_dp); + int lttpr_count = 0; - if (drm_dp_read_dpcd_caps(&intel_dp->aux, dpcd)) - return -EIO; + /* + * 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). + */ + if (!intel_dp_is_edp(intel_dp) && + (DISPLAY_VER(i915) >= 10 && !IS_GEMINILAKE(i915))) { + u8 dpcd[DP_RECEIVER_CAP_SIZE]; + + if (drm_dp_dpcd_probe(&intel_dp->aux, DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV)) + return -EIO; - lttpr_count = intel_dp_init_lttpr(intel_dp, dpcd); + if (drm_dp_read_dpcd_caps(&intel_dp->aux, dpcd)) + return -EIO; + + lttpr_count = intel_dp_init_lttpr(intel_dp, dpcd); + } /* * The DPTX shall read the DPRX caps after LTTPR detection, so re-read |