Add an assert that lookups from the intel_dp->common_rates[] array are always valid.
Cc: Ville Syrjälä <[email protected]> Signed-off-by: Imre Deak <[email protected]> --- drivers/gpu/drm/i915/display/intel_dp.c | 33 ++++++++++++------------- 1 file changed, 16 insertions(+), 17 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index f8082eb8e7263..3869d454c10f0 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -267,10 +267,19 @@ static int intel_dp_common_len_rate_limit(const struct intel_dp *intel_dp, intel_dp->num_common_rates, max_rate); } +static int intel_dp_common_rate(struct intel_dp *intel_dp, int index) +{ + if (drm_WARN_ON(&dp_to_i915(intel_dp)->drm, + index < 0 || index >= intel_dp->num_common_rates)) + return 162000; + + return intel_dp->common_rates[index]; +} + /* Theoretical max between source and sink */ static int intel_dp_max_common_rate(struct intel_dp *intel_dp) { - return intel_dp->common_rates[intel_dp->num_common_rates - 1]; + return intel_dp_common_rate(intel_dp, intel_dp->num_common_rates - 1); } /* Theoretical max between source and sink */ @@ -610,13 +619,13 @@ int intel_dp_get_link_train_fallback_values(struct intel_dp *intel_dp, if (index > 0) { if (intel_dp_is_edp(intel_dp) && !intel_dp_can_link_train_fallback_for_edp(intel_dp, - intel_dp->common_rates[index - 1], + intel_dp_common_rate(intel_dp, index - 1), lane_count)) { drm_dbg_kms(&i915->drm, "Retrying Link training for eDP with same parameters\n"); return 0; } - intel_dp->max_link_rate = intel_dp->common_rates[index - 1]; + intel_dp->max_link_rate = intel_dp_common_rate(intel_dp, index - 1); intel_dp->max_link_lane_count = lane_count; } else if (lane_count > 1) { if (intel_dp_is_edp(intel_dp) && @@ -1056,14 +1065,11 @@ static void intel_dp_print_rates(struct intel_dp *intel_dp) int intel_dp_max_link_rate(struct intel_dp *intel_dp) { - struct drm_i915_private *i915 = dp_to_i915(intel_dp); int len; len = intel_dp_common_len_rate_limit(intel_dp, intel_dp->max_link_rate); - if (drm_WARN_ON(&i915->drm, len <= 0)) - return 162000; - return intel_dp->common_rates[len - 1]; + return intel_dp_common_rate(intel_dp, len - 1); } int intel_dp_rate_select(struct intel_dp *intel_dp, int rate) @@ -1260,7 +1266,7 @@ intel_dp_compute_link_config_wide(struct intel_dp *intel_dp, output_bpp); for (i = 0; i < intel_dp->num_common_rates; i++) { - link_rate = intel_dp->common_rates[i]; + link_rate = intel_dp_common_rate(intel_dp, i); if (link_rate < limits->min_rate || link_rate > limits->max_rate) continue; @@ -1508,17 +1514,10 @@ intel_dp_compute_link_config(struct intel_encoder *encoder, &pipe_config->hw.adjusted_mode; struct intel_dp *intel_dp = enc_to_intel_dp(encoder); struct link_config_limits limits; - int common_len; int ret; - common_len = intel_dp_common_len_rate_limit(intel_dp, - intel_dp->max_link_rate); - - /* No common link rates between source and sink */ - drm_WARN_ON(encoder->base.dev, common_len <= 0); - - limits.min_rate = intel_dp->common_rates[0]; - limits.max_rate = intel_dp->common_rates[common_len - 1]; + limits.min_rate = intel_dp_common_rate(intel_dp, 0); + limits.max_rate = intel_dp_max_link_rate(intel_dp); limits.min_lane_count = 1; limits.max_lane_count = intel_dp_max_lane_count(intel_dp); -- 2.27.0
