From e2fa6fba3d2fa03a5efdedf0b6f045fcc3428a80 Mon Sep 17 00:00:00 2001 From: Pallavi G Date: Thu, 18 Apr 2013 14:44:28 -0700 Subject: [PATCH] drm/i915/dp: program VSwing and Preemphasis control settings on VLV v2 Program few Tx buffer Swing control settings through DPIO. v2: fix up codingstyle (Daniel) call from set_signal_levels (Ville, Daniel) use proper port numbers (Jesse) Signed-off-by: Pallavi G Signed-off-by: Yogesh M Signed-off-by: Gajanan Bhat Signed-off-by: Jesse Barnes (v2 changes) [danvet: Reorder if-ladder to avoid two IS_VLV checks.] Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_display.c | 3 +- drivers/gpu/drm/i915/intel_dp.c | 128 ++++++++++++++++++++++++++++++++++- drivers/gpu/drm/i915/intel_drv.h | 2 + 3 files changed, 128 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c index bdbad76..9ff992a 100644 --- a/drivers/gpu/drm/i915/intel_display.c +++ b/drivers/gpu/drm/i915/intel_display.c @@ -450,8 +450,7 @@ u32 intel_dpio_read(struct drm_i915_private *dev_priv, int reg) return I915_READ(DPIO_DATA); } -static void intel_dpio_write(struct drm_i915_private *dev_priv, int reg, - u32 val) +void intel_dpio_write(struct drm_i915_private *dev_priv, int reg, u32 val) { WARN_ON(!mutex_is_locked(&dev_priv->dpio_lock)); diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 89f89b7..9e16b0c 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -1461,7 +1461,9 @@ intel_dp_voltage_max(struct intel_dp *intel_dp) { struct drm_device *dev = intel_dp_to_dev(intel_dp); - if (IS_GEN7(dev) && is_cpu_edp(intel_dp)) + if (IS_VALLEYVIEW(dev)) + return DP_TRAIN_VOLTAGE_SWING_1200; + else if (IS_GEN7(dev) && is_cpu_edp(intel_dp)) return DP_TRAIN_VOLTAGE_SWING_800; else if (HAS_PCH_CPT(dev) && !is_cpu_edp(intel_dp)) return DP_TRAIN_VOLTAGE_SWING_1200; @@ -1486,7 +1488,19 @@ intel_dp_pre_emphasis_max(struct intel_dp *intel_dp, uint8_t voltage_swing) default: return DP_TRAIN_PRE_EMPHASIS_0; } - } else if (IS_GEN7(dev) && is_cpu_edp(intel_dp) && !IS_VALLEYVIEW(dev)) { + } else if (IS_VALLEYVIEW(dev)) { + switch (voltage_swing & DP_TRAIN_VOLTAGE_SWING_MASK) { + case DP_TRAIN_VOLTAGE_SWING_400: + return DP_TRAIN_PRE_EMPHASIS_9_5; + case DP_TRAIN_VOLTAGE_SWING_600: + return DP_TRAIN_PRE_EMPHASIS_6; + case DP_TRAIN_VOLTAGE_SWING_800: + return DP_TRAIN_PRE_EMPHASIS_3_5; + case DP_TRAIN_VOLTAGE_SWING_1200: + default: + return DP_TRAIN_PRE_EMPHASIS_0; + } + } else if (IS_GEN7(dev) && is_cpu_edp(intel_dp)) { switch (voltage_swing & DP_TRAIN_VOLTAGE_SWING_MASK) { case DP_TRAIN_VOLTAGE_SWING_400: return DP_TRAIN_PRE_EMPHASIS_6; @@ -1511,6 +1525,111 @@ intel_dp_pre_emphasis_max(struct intel_dp *intel_dp, uint8_t voltage_swing) } } +static uint32_t intel_vlv_signal_levels(struct intel_dp *intel_dp) +{ + struct drm_device *dev = intel_dp_to_dev(intel_dp); + struct drm_i915_private *dev_priv = dev->dev_private; + struct intel_digital_port *dport = dp_to_dig_port(intel_dp); + unsigned long demph_reg_value, preemph_reg_value, + uniqtranscale_reg_value; + uint8_t train_set = intel_dp->train_set[0]; + int port; + + if (dport->port == PORT_B) + port = 0; + else if (dport->port == PORT_C) + port = 1; + else + BUG(); + + switch (train_set & DP_TRAIN_PRE_EMPHASIS_MASK) { + case DP_TRAIN_PRE_EMPHASIS_0: + preemph_reg_value = 0x0004000; + switch (train_set & DP_TRAIN_VOLTAGE_SWING_MASK) { + case DP_TRAIN_VOLTAGE_SWING_400: + demph_reg_value = 0x2B405555; + uniqtranscale_reg_value = 0x552AB83A; + break; + case DP_TRAIN_VOLTAGE_SWING_600: + demph_reg_value = 0x2B404040; + uniqtranscale_reg_value = 0x5548B83A; + break; + case DP_TRAIN_VOLTAGE_SWING_800: + demph_reg_value = 0x2B245555; + uniqtranscale_reg_value = 0x5560B83A; + break; + case DP_TRAIN_VOLTAGE_SWING_1200: + demph_reg_value = 0x2B405555; + uniqtranscale_reg_value = 0x5598DA3A; + break; + default: + return 0; + } + break; + case DP_TRAIN_PRE_EMPHASIS_3_5: + preemph_reg_value = 0x0002000; + switch (train_set & DP_TRAIN_VOLTAGE_SWING_MASK) { + case DP_TRAIN_VOLTAGE_SWING_400: + demph_reg_value = 0x2B404040; + uniqtranscale_reg_value = 0x5552B83A; + break; + case DP_TRAIN_VOLTAGE_SWING_600: + demph_reg_value = 0x2B404848; + uniqtranscale_reg_value = 0x5580B83A; + break; + case DP_TRAIN_VOLTAGE_SWING_800: + demph_reg_value = 0x2B404040; + uniqtranscale_reg_value = 0x55ADDA3A; + break; + default: + return 0; + } + break; + case DP_TRAIN_PRE_EMPHASIS_6: + preemph_reg_value = 0x0000000; + switch (train_set & DP_TRAIN_VOLTAGE_SWING_MASK) { + case DP_TRAIN_VOLTAGE_SWING_400: + demph_reg_value = 0x2B305555; + uniqtranscale_reg_value = 0x5570B83A; + break; + case DP_TRAIN_VOLTAGE_SWING_600: + demph_reg_value = 0x2B2B4040; + uniqtranscale_reg_value = 0x55ADDA3A; + break; + default: + return 0; + } + break; + case DP_TRAIN_PRE_EMPHASIS_9_5: + preemph_reg_value = 0x0006000; + switch (train_set & DP_TRAIN_VOLTAGE_SWING_MASK) { + case DP_TRAIN_VOLTAGE_SWING_400: + demph_reg_value = 0x1B405555; + uniqtranscale_reg_value = 0x55ADDA3A; + break; + default: + return 0; + } + break; + default: + return 0; + } + + /* eDP is only on port C */ + mutex_lock(&dev_priv->dpio_lock); + intel_dpio_write(dev_priv, DPIO_TX_OCALINIT(port), 0x00000000); + intel_dpio_write(dev_priv, DPIO_TX_SWING_CTL4(port), demph_reg_value); + intel_dpio_write(dev_priv, DPIO_TX_SWING_CTL2(port), + uniqtranscale_reg_value); + intel_dpio_write(dev_priv, DPIO_TX_SWING_CTL3(port), 0x0C782040); + intel_dpio_write(dev_priv, DPIO_PCS_STAGGER0(port), 0x00030000); + intel_dpio_write(dev_priv, DPIO_PCS_CTL_OVER1(port), preemph_reg_value); + intel_dpio_write(dev_priv, DPIO_TX_OCALINIT(port), 0x80000000); + mutex_unlock(&dev_priv->dpio_lock); + + return 0; +} + static void intel_get_adjust_train(struct intel_dp *intel_dp, uint8_t link_status[DP_LINK_STATUS_SIZE]) { @@ -1685,7 +1804,10 @@ intel_dp_set_signal_levels(struct intel_dp *intel_dp, uint32_t *DP) if (HAS_DDI(dev)) { signal_levels = intel_hsw_signal_levels(train_set); mask = DDI_BUF_EMP_MASK; - } else if (IS_GEN7(dev) && is_cpu_edp(intel_dp) && !IS_VALLEYVIEW(dev)) { + } else if (IS_VALLEYVIEW(dev)) { + signal_levels = intel_vlv_signal_levels(intel_dp); + mask = 0; + } else if (IS_GEN7(dev) && is_cpu_edp(intel_dp)) { signal_levels = intel_gen7_edp_signal_levels(train_set); mask = EDP_LINK_TRAIN_VOL_EMP_MASK_IVB; } else if (IS_GEN6(dev) && is_cpu_edp(intel_dp)) { diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h index b5b6d19..399b181 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -689,6 +689,8 @@ extern int intel_sprite_get_colorkey(struct drm_device *dev, void *data, struct drm_file *file_priv); extern u32 intel_dpio_read(struct drm_i915_private *dev_priv, int reg); +extern void intel_dpio_write(struct drm_i915_private *dev_priv, int reg, + u32 val); /* Power-related functions, located in intel_pm.c */ extern void intel_init_pm(struct drm_device *dev); -- 2.7.4