From 869184a675662bddcdf76c5b95665272facff2b8 Mon Sep 17 00:00:00 2001 From: Jesse Barnes Date: Thu, 7 Oct 2010 16:01:22 -0700 Subject: [PATCH] drm/i915/dp: use VBT provided eDP params if available We can skip most of the link training step if we use the VBT provided values. Signed-off-by: Jesse Barnes Signed-off-by: Chris Wilson --- drivers/gpu/drm/i915/intel_dp.c | 146 +++++++++++++++++++------------- 1 file changed, 89 insertions(+), 57 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 7fa828275e4a..d4ef20598da8 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -581,6 +581,17 @@ intel_dp_mode_fixup(struct drm_encoder *encoder, struct drm_display_mode *mode, mode->clock = dev_priv->panel_fixed_mode->clock; } + /* Just use VBT values for eDP */ + if (is_edp(intel_dp)) { + intel_dp->lane_count = dev_priv->edp.lanes; + intel_dp->link_bw = dev_priv->edp.rate; + adjusted_mode->clock = intel_dp_link_clock(intel_dp->link_bw); + DRM_DEBUG_KMS("eDP link bw %02x lane count %d clock %d\n", + intel_dp->link_bw, intel_dp->lane_count, + adjusted_mode->clock); + return true; + } + for (lane_count = 1; lane_count <= max_lane_count; lane_count <<= 1) { for (clock = 0; clock <= max_clock; clock++) { int link_avail = intel_dp_max_data_rate(intel_dp_link_clock(bws[clock]), lane_count); @@ -599,19 +610,6 @@ intel_dp_mode_fixup(struct drm_encoder *encoder, struct drm_display_mode *mode, } } - if (is_edp(intel_dp)) { - /* okay we failed just pick the highest */ - intel_dp->lane_count = max_lane_count; - intel_dp->link_bw = bws[max_clock]; - adjusted_mode->clock = intel_dp_link_clock(intel_dp->link_bw); - DRM_DEBUG_KMS("Force picking display port link bw %02x lane " - "count %d clock %d\n", - intel_dp->link_bw, intel_dp->lane_count, - adjusted_mode->clock); - - return true; - } - return false; } @@ -1088,11 +1086,21 @@ intel_get_adjust_train(struct intel_dp *intel_dp) } static uint32_t -intel_dp_signal_levels(uint8_t train_set, int lane_count) +intel_dp_signal_levels(struct intel_dp *intel_dp) { - uint32_t signal_levels = 0; + struct drm_device *dev = intel_dp->base.base.dev; + struct drm_i915_private *dev_priv = dev->dev_private; + uint32_t signal_levels = 0; + u8 train_set = intel_dp->train_set[0]; + u32 vswing = train_set & DP_TRAIN_VOLTAGE_SWING_MASK; + u32 preemphasis = train_set & DP_TRAIN_PRE_EMPHASIS_MASK; - switch (train_set & DP_TRAIN_VOLTAGE_SWING_MASK) { + if (is_edp(intel_dp)) { + vswing = dev_priv->edp.vswing; + preemphasis = dev_priv->edp.preemphasis; + } + + switch (vswing) { case DP_TRAIN_VOLTAGE_SWING_400: default: signal_levels |= DP_VOLTAGE_0_4; @@ -1107,7 +1115,7 @@ intel_dp_signal_levels(uint8_t train_set, int lane_count) signal_levels |= DP_VOLTAGE_1_2; break; } - switch (train_set & DP_TRAIN_PRE_EMPHASIS_MASK) { + switch (preemphasis) { case DP_TRAIN_PRE_EMPHASIS_0: default: signal_levels |= DP_PRE_EMPHASIS_0; @@ -1193,6 +1201,18 @@ intel_channel_eq_ok(struct intel_dp *intel_dp) return true; } +static bool +intel_dp_aux_handshake_required(struct intel_dp *intel_dp) +{ + struct drm_device *dev = intel_dp->base.base.dev; + struct drm_i915_private *dev_priv = dev->dev_private; + + if (is_edp(intel_dp) && dev_priv->no_aux_handshake) + return false; + + return true; +} + static bool intel_dp_set_link_train(struct intel_dp *intel_dp, uint32_t dp_reg_value, @@ -1205,6 +1225,9 @@ intel_dp_set_link_train(struct intel_dp *intel_dp, I915_WRITE(intel_dp->output_reg, dp_reg_value); POSTING_READ(intel_dp->output_reg); + if (!intel_dp_aux_handshake_required(intel_dp)) + return true; + intel_dp_aux_native_write_1(intel_dp, DP_TRAINING_PATTERN_SET, dp_train_pat); @@ -1237,10 +1260,11 @@ intel_dp_start_link_train(struct intel_dp *intel_dp) POSTING_READ(intel_dp->output_reg); intel_wait_for_vblank(dev, intel_crtc->pipe); - /* Write the link configuration data */ - intel_dp_aux_native_write(intel_dp, DP_LINK_BW_SET, - intel_dp->link_configuration, - DP_LINK_CONFIGURATION_SIZE); + if (intel_dp_aux_handshake_required(intel_dp)) + /* Write the link configuration data */ + intel_dp_aux_native_write(intel_dp, DP_LINK_BW_SET, + intel_dp->link_configuration, + DP_LINK_CONFIGURATION_SIZE); DP |= DP_PORT_EN; if (HAS_PCH_CPT(dev) && !is_edp(intel_dp)) @@ -1258,7 +1282,7 @@ intel_dp_start_link_train(struct intel_dp *intel_dp) signal_levels = intel_gen6_edp_signal_levels(intel_dp->train_set[0]); DP = (DP & ~EDP_LINK_TRAIN_VOL_EMP_MASK_SNB) | signal_levels; } else { - signal_levels = intel_dp_signal_levels(intel_dp->train_set[0], intel_dp->lane_count); + signal_levels = intel_dp_signal_levels(intel_dp); DP = (DP & ~(DP_VOLTAGE_MASK|DP_PRE_EMPHASIS_MASK)) | signal_levels; } @@ -1272,33 +1296,37 @@ intel_dp_start_link_train(struct intel_dp *intel_dp) break; /* Set training pattern 1 */ - udelay(100); - if (!intel_dp_get_link_status(intel_dp)) + udelay(500); + if (intel_dp_aux_handshake_required(intel_dp)) { break; + } else { + if (!intel_dp_get_link_status(intel_dp)) + break; - if (intel_clock_recovery_ok(intel_dp->link_status, intel_dp->lane_count)) { - clock_recovery = true; - break; - } - - /* Check to see if we've tried the max voltage */ - for (i = 0; i < intel_dp->lane_count; i++) - if ((intel_dp->train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0) + if (intel_clock_recovery_ok(intel_dp->link_status, intel_dp->lane_count)) { + clock_recovery = true; break; - if (i == intel_dp->lane_count) - break; + } - /* Check to see if we've tried the same voltage 5 times */ - if ((intel_dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) { - ++tries; - if (tries == 5) + /* Check to see if we've tried the max voltage */ + for (i = 0; i < intel_dp->lane_count; i++) + if ((intel_dp->train_set[i] & DP_TRAIN_MAX_SWING_REACHED) == 0) + break; + if (i == intel_dp->lane_count) break; - } else - tries = 0; - voltage = intel_dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK; - /* Compute new intel_dp->train_set as requested by target */ - intel_get_adjust_train(intel_dp); + /* Check to see if we've tried the same voltage 5 times */ + if ((intel_dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) { + ++tries; + if (tries == 5) + break; + } else + tries = 0; + voltage = intel_dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK; + + /* Compute new intel_dp->train_set as requested by target */ + intel_get_adjust_train(intel_dp); + } } intel_dp->DP = DP; @@ -1325,7 +1353,7 @@ intel_dp_complete_link_train(struct intel_dp *intel_dp) signal_levels = intel_gen6_edp_signal_levels(intel_dp->train_set[0]); DP = (DP & ~EDP_LINK_TRAIN_VOL_EMP_MASK_SNB) | signal_levels; } else { - signal_levels = intel_dp_signal_levels(intel_dp->train_set[0], intel_dp->lane_count); + signal_levels = intel_dp_signal_levels(intel_dp); DP = (DP & ~(DP_VOLTAGE_MASK|DP_PRE_EMPHASIS_MASK)) | signal_levels; } @@ -1339,24 +1367,28 @@ intel_dp_complete_link_train(struct intel_dp *intel_dp) DP_TRAINING_PATTERN_2)) break; - udelay(400); - if (!intel_dp_get_link_status(intel_dp)) - break; + udelay(500); - if (intel_channel_eq_ok(intel_dp)) { - channel_eq = true; + if (!intel_dp_aux_handshake_required(intel_dp)) { break; - } + } else { + if (!intel_dp_get_link_status(intel_dp)) + break; - /* Try 5 times */ - if (tries > 5) - break; + if (intel_channel_eq_ok(intel_dp)) { + channel_eq = true; + break; + } - /* Compute new intel_dp->train_set as requested by target */ - intel_get_adjust_train(intel_dp); - ++tries; - } + /* Try 5 times */ + if (tries > 5) + break; + /* Compute new intel_dp->train_set as requested by target */ + intel_get_adjust_train(intel_dp); + ++tries; + } + } if (HAS_PCH_CPT(dev) && !is_edp(intel_dp)) reg = DP | DP_LINK_TRAIN_OFF_CPT; else -- 2.39.5