From: Ander Conselvan de Oliveira Date: Fri, 23 Oct 2015 10:01:44 +0000 (+0300) Subject: drm/i915: Don't pass *DP around to link training functions X-Git-Tag: v4.5-rc1~74^2~37^2~149 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=f4eb692e8edc600d1b02ad2f1320ee7cae454711;p=karo-tx-linux.git drm/i915: Don't pass *DP around to link training functions It just makes the code more confusing, so just reference intel_dp_>DP directly. Note that this also fix a bug where the value of intel_dp->DP could be different than the last value written to the hw, due to an early return that would skip the 'intel_dp->DP = DP' line. v2: Don't preserve old DP value on failure. (Sivakumar) - Don't call drm_dp_clock_recovery_ok() twice. (Sivakumar) - Keep return type of clock recovery and channel equalization functions as void. (Ander) v3: Remove DP parameter from intel_dp_set_signal_levels(). (Sivakumar) Signed-off-by: Ander Conselvan de Oliveira Reviewed-by: Sivakumar Thulasimani Link: http://patchwork.freedesktop.org/patch/msgid/1445594525-7174-2-git-send-email-ander.conselvan.de.oliveira@intel.com --- diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 4655af0c4649..6917dd1d161e 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -3552,7 +3552,7 @@ gen7_edp_signal_levels(uint8_t train_set) /* Properly updates "DP" with the correct signal levels. */ static void -intel_dp_set_signal_levels(struct intel_dp *intel_dp, uint32_t *DP) +intel_dp_set_signal_levels(struct intel_dp *intel_dp) { struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); enum port port = intel_dig_port->port; @@ -3591,12 +3591,11 @@ intel_dp_set_signal_levels(struct intel_dp *intel_dp, uint32_t *DP) (train_set & DP_TRAIN_PRE_EMPHASIS_MASK) >> DP_TRAIN_PRE_EMPHASIS_SHIFT); - *DP = (*DP & ~mask) | signal_levels; + intel_dp->DP = (intel_dp->DP & ~mask) | signal_levels; } static bool intel_dp_set_link_train(struct intel_dp *intel_dp, - uint32_t *DP, uint8_t dp_train_pat) { struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); @@ -3605,9 +3604,9 @@ intel_dp_set_link_train(struct intel_dp *intel_dp, uint8_t buf[sizeof(intel_dp->train_set) + 1]; int ret, len; - _intel_dp_set_link_train(intel_dp, DP, dp_train_pat); + _intel_dp_set_link_train(intel_dp, &intel_dp->DP, dp_train_pat); - I915_WRITE(intel_dp->output_reg, *DP); + I915_WRITE(intel_dp->output_reg, intel_dp->DP); POSTING_READ(intel_dp->output_reg); buf[0] = dp_train_pat; @@ -3628,17 +3627,17 @@ intel_dp_set_link_train(struct intel_dp *intel_dp, } static bool -intel_dp_reset_link_train(struct intel_dp *intel_dp, uint32_t *DP, +intel_dp_reset_link_train(struct intel_dp *intel_dp, uint8_t dp_train_pat) { if (!intel_dp->train_set_valid) memset(intel_dp->train_set, 0, sizeof(intel_dp->train_set)); - intel_dp_set_signal_levels(intel_dp, DP); - return intel_dp_set_link_train(intel_dp, DP, dp_train_pat); + intel_dp_set_signal_levels(intel_dp); + return intel_dp_set_link_train(intel_dp, dp_train_pat); } static bool -intel_dp_update_link_train(struct intel_dp *intel_dp, uint32_t *DP, +intel_dp_update_link_train(struct intel_dp *intel_dp, const uint8_t link_status[DP_LINK_STATUS_SIZE]) { struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp); @@ -3647,9 +3646,9 @@ intel_dp_update_link_train(struct intel_dp *intel_dp, uint32_t *DP, int ret; intel_get_adjust_train(intel_dp, link_status); - intel_dp_set_signal_levels(intel_dp, DP); + intel_dp_set_signal_levels(intel_dp); - I915_WRITE(intel_dp->output_reg, *DP); + I915_WRITE(intel_dp->output_reg, intel_dp->DP); POSTING_READ(intel_dp->output_reg); ret = drm_dp_dpcd_write(&intel_dp->aux, DP_TRAINING_LANE0_SET, @@ -3698,7 +3697,6 @@ intel_dp_link_training_clock_recovery(struct intel_dp *intel_dp) int i; uint8_t voltage; int voltage_tries, loop_tries; - uint32_t DP = intel_dp->DP; uint8_t link_config[2]; uint8_t link_bw, rate_select; @@ -3722,10 +3720,10 @@ intel_dp_link_training_clock_recovery(struct intel_dp *intel_dp) link_config[1] = DP_SET_ANSI_8B10B; drm_dp_dpcd_write(&intel_dp->aux, DP_DOWNSPREAD_CTRL, link_config, 2); - DP |= DP_PORT_EN; + intel_dp->DP |= DP_PORT_EN; /* clock recovery */ - if (!intel_dp_reset_link_train(intel_dp, &DP, + if (!intel_dp_reset_link_train(intel_dp, DP_TRAINING_PATTERN_1 | DP_LINK_SCRAMBLING_DISABLE)) { DRM_ERROR("failed to enable link training\n"); @@ -3757,7 +3755,7 @@ intel_dp_link_training_clock_recovery(struct intel_dp *intel_dp) DRM_DEBUG_KMS("clock recovery not ok, reset"); /* clear the flag as we are not reusing train set */ intel_dp->train_set_valid = false; - if (!intel_dp_reset_link_train(intel_dp, &DP, + if (!intel_dp_reset_link_train(intel_dp, DP_TRAINING_PATTERN_1 | DP_LINK_SCRAMBLING_DISABLE)) { DRM_ERROR("failed to enable link training\n"); @@ -3776,7 +3774,7 @@ intel_dp_link_training_clock_recovery(struct intel_dp *intel_dp) DRM_ERROR("too many full retries, give up\n"); break; } - intel_dp_reset_link_train(intel_dp, &DP, + intel_dp_reset_link_train(intel_dp, DP_TRAINING_PATTERN_1 | DP_LINK_SCRAMBLING_DISABLE); voltage_tries = 0; @@ -3795,13 +3793,11 @@ intel_dp_link_training_clock_recovery(struct intel_dp *intel_dp) voltage = intel_dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK; /* Update training set as requested by target */ - if (!intel_dp_update_link_train(intel_dp, &DP, link_status)) { + if (!intel_dp_update_link_train(intel_dp, link_status)) { DRM_ERROR("failed to update link training\n"); break; } } - - intel_dp->DP = DP; } static void @@ -3811,7 +3807,6 @@ intel_dp_link_training_channel_equalization(struct intel_dp *intel_dp) struct drm_device *dev = dig_port->base.base.dev; bool channel_eq = false; int tries, cr_tries; - uint32_t DP = intel_dp->DP; uint32_t training_pattern = DP_TRAINING_PATTERN_2; /* @@ -3830,7 +3825,7 @@ intel_dp_link_training_channel_equalization(struct intel_dp *intel_dp) DRM_ERROR("5.4 Gbps link rate without HBR2/TPS3 support\n"); /* channel equalization */ - if (!intel_dp_set_link_train(intel_dp, &DP, + if (!intel_dp_set_link_train(intel_dp, training_pattern | DP_LINK_SCRAMBLING_DISABLE)) { DRM_ERROR("failed to start channel equalization\n"); @@ -3859,7 +3854,7 @@ intel_dp_link_training_channel_equalization(struct intel_dp *intel_dp) intel_dp->lane_count)) { intel_dp->train_set_valid = false; intel_dp_link_training_clock_recovery(intel_dp); - intel_dp_set_link_train(intel_dp, &DP, + intel_dp_set_link_train(intel_dp, training_pattern | DP_LINK_SCRAMBLING_DISABLE); cr_tries++; @@ -3876,7 +3871,7 @@ intel_dp_link_training_channel_equalization(struct intel_dp *intel_dp) if (tries > 5) { intel_dp->train_set_valid = false; intel_dp_link_training_clock_recovery(intel_dp); - intel_dp_set_link_train(intel_dp, &DP, + intel_dp_set_link_train(intel_dp, training_pattern | DP_LINK_SCRAMBLING_DISABLE); tries = 0; @@ -3885,7 +3880,7 @@ intel_dp_link_training_channel_equalization(struct intel_dp *intel_dp) } /* Update training set as requested by target */ - if (!intel_dp_update_link_train(intel_dp, &DP, link_status)) { + if (!intel_dp_update_link_train(intel_dp, link_status)) { DRM_ERROR("failed to update link training\n"); break; } @@ -3894,8 +3889,6 @@ intel_dp_link_training_channel_equalization(struct intel_dp *intel_dp) intel_dp_set_idle_link_train(intel_dp); - intel_dp->DP = DP; - if (channel_eq) { intel_dp->train_set_valid = true; DRM_DEBUG_KMS("Channel EQ done. DP Training successful\n"); @@ -3904,7 +3897,7 @@ intel_dp_link_training_channel_equalization(struct intel_dp *intel_dp) void intel_dp_stop_link_train(struct intel_dp *intel_dp) { - intel_dp_set_link_train(intel_dp, &intel_dp->DP, + intel_dp_set_link_train(intel_dp, DP_TRAINING_PATTERN_DISABLE); }