From 96fb9f9b154a8dbfe1f74c384cd82f73539fda93 Mon Sep 17 00:00:00 2001 From: Vandana Kannan Date: Tue, 18 Nov 2014 15:45:27 +0530 Subject: [PATCH] drm/i915/bxt: VSwing programming sequence VSwing programming sequence as specified in the updated BXT BSpec v2: Satheesh's review comments addressed. - clear value before setting into registers - move print statement to bxt function Other changes - since signal level will not be set into DDI_BUF_CTL, the value need not be returned to intel_dp_set_signal_levels(). Making the bxt specific function to return void and setting signal_levels = 0 for bxt inside intel_dp_set_signal_levels() - instead of signal levels, printing vswing level and pre-emphasis level - in case none of the pre-emphasis levels or vswing levels are set, setting default of 400mV + 0dB v3: Satheesh's review comments - Check for mask before printing signal_levels. - Removing redundant register writes - Call intel_prepare_ddi_buffers only for HAS_PCH_SPLIT - Making register write part generic as it will be required for HDMI as well. Re-structure the code to include an array for vswing related values, set signal levels v4: Satheesh's review comments - Rebase over latest renaming patches - use hsw_signal_levels for HAS_DDI Other changes - Modified vswing_sequence() func definition - Rebased on top of register macro definitions v5: Satheesh's review comments - Check ddi translation table size v6: Imre's review comments - removed comments in vswing sequence - added vswing, pre-emphasis prints in intel_dp_set_signal_levels - added comment explaining use of DP vswing values for eDP - initialize n_entries and ddi_transaltion table based on encoder type - create bxt_ddi_buf_trans structure and use decimal values - adding a flag in bxt buffer translation table to indicate def entry v7: (imre) - squash in Vandana's "VSwing register definition", "HDMI VSwing programming", "Re-enable vswing programming", "Fix vswing sequence" patches - use BXT_PORT_* regs directly instead of via a temp var - simplify BXT_PORT_* macro definitions - add code comment why we read lane while write group registers - fix readout of DP_TRAIN_PRE_EMPHASIS in debug message Signed-off-by: Vandana Kannan (v6) Signed-off-by: Imre Deak Reviewed-by: Sivakumar Thulasimani Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/i915_reg.h | 61 ++++++++++++++++ drivers/gpu/drm/i915/intel_ddi.c | 120 ++++++++++++++++++++++++++++++- drivers/gpu/drm/i915/intel_dp.c | 64 ++++++++++++++++- drivers/gpu/drm/i915/intel_drv.h | 2 + 4 files changed, 244 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index 5c81728e4400..d47afbc97a21 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -1260,6 +1260,21 @@ enum skl_disp_power_wells { _PORT_REF_DW8_A) /* BXT PHY PCS registers */ +#define _PORT_PCS_DW10_LN01_A 0x162428 +#define _PORT_PCS_DW10_LN01_B 0x6C428 +#define _PORT_PCS_DW10_LN01_C 0x6C828 +#define _PORT_PCS_DW10_GRP_A 0x162C28 +#define _PORT_PCS_DW10_GRP_B 0x6CC28 +#define _PORT_PCS_DW10_GRP_C 0x6CE28 +#define BXT_PORT_PCS_DW10_LN01(port) _PORT3(port, _PORT_PCS_DW10_LN01_A, \ + _PORT_PCS_DW10_LN01_B, \ + _PORT_PCS_DW10_LN01_C) +#define BXT_PORT_PCS_DW10_GRP(port) _PORT3(port, _PORT_PCS_DW10_GRP_A, \ + _PORT_PCS_DW10_GRP_B, \ + _PORT_PCS_DW10_GRP_C) +#define TX2_SWING_CALC_INIT (1 << 31) +#define TX1_SWING_CALC_INIT (1 << 30) + #define _PORT_PCS_DW12_LN01_A 0x162430 #define _PORT_PCS_DW12_LN01_B 0x6C430 #define _PORT_PCS_DW12_LN01_C 0x6C830 @@ -1285,6 +1300,52 @@ enum skl_disp_power_wells { #define _BXT_LANE_OFFSET(lane) (((lane) >> 1) * 0x200 + \ ((lane) & 1) * 0x80) +#define _PORT_TX_DW2_LN0_A 0x162508 +#define _PORT_TX_DW2_LN0_B 0x6C508 +#define _PORT_TX_DW2_LN0_C 0x6C908 +#define _PORT_TX_DW2_GRP_A 0x162D08 +#define _PORT_TX_DW2_GRP_B 0x6CD08 +#define _PORT_TX_DW2_GRP_C 0x6CF08 +#define BXT_PORT_TX_DW2_GRP(port) _PORT3(port, _PORT_TX_DW2_GRP_A, \ + _PORT_TX_DW2_GRP_B, \ + _PORT_TX_DW2_GRP_C) +#define BXT_PORT_TX_DW2_LN0(port) _PORT3(port, _PORT_TX_DW2_LN0_A, \ + _PORT_TX_DW2_LN0_B, \ + _PORT_TX_DW2_LN0_C) +#define MARGIN_000_SHIFT 16 +#define MARGIN_000 (0xFF << MARGIN_000_SHIFT) +#define UNIQ_TRANS_SCALE_SHIFT 8 +#define UNIQ_TRANS_SCALE (0xFF << UNIQ_TRANS_SCALE_SHIFT) + +#define _PORT_TX_DW3_LN0_A 0x16250C +#define _PORT_TX_DW3_LN0_B 0x6C50C +#define _PORT_TX_DW3_LN0_C 0x6C90C +#define _PORT_TX_DW3_GRP_A 0x162D0C +#define _PORT_TX_DW3_GRP_B 0x6CD0C +#define _PORT_TX_DW3_GRP_C 0x6CF0C +#define BXT_PORT_TX_DW3_GRP(port) _PORT3(port, _PORT_TX_DW3_GRP_A, \ + _PORT_TX_DW3_GRP_B, \ + _PORT_TX_DW3_GRP_C) +#define BXT_PORT_TX_DW3_LN0(port) _PORT3(port, _PORT_TX_DW3_LN0_A, \ + _PORT_TX_DW3_LN0_B, \ + _PORT_TX_DW3_LN0_C) +#define UNIQE_TRANGE_EN_METHOD (1 << 27) + +#define _PORT_TX_DW4_LN0_A 0x162510 +#define _PORT_TX_DW4_LN0_B 0x6C510 +#define _PORT_TX_DW4_LN0_C 0x6C910 +#define _PORT_TX_DW4_GRP_A 0x162D10 +#define _PORT_TX_DW4_GRP_B 0x6CD10 +#define _PORT_TX_DW4_GRP_C 0x6CF10 +#define BXT_PORT_TX_DW4_LN0(port) _PORT3(port, _PORT_TX_DW4_LN0_A, \ + _PORT_TX_DW4_LN0_B, \ + _PORT_TX_DW4_LN0_C) +#define BXT_PORT_TX_DW4_GRP(port) _PORT3(port, _PORT_TX_DW4_GRP_A, \ + _PORT_TX_DW4_GRP_B, \ + _PORT_TX_DW4_GRP_C) +#define DEEMPH_SHIFT 24 +#define DE_EMPHASIS (0xFF << DEEMPH_SHIFT) + #define _PORT_TX_DW14_LN0_A 0x162538 #define _PORT_TX_DW14_LN0_B 0x6C538 #define _PORT_TX_DW14_LN0_C 0x6C938 diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c index 43b38d76761c..455d44b49c66 100644 --- a/drivers/gpu/drm/i915/intel_ddi.c +++ b/drivers/gpu/drm/i915/intel_ddi.c @@ -168,6 +168,48 @@ static const struct ddi_buf_trans skl_ddi_translations_hdmi[] = { { 0x00000018, 0x000000c7 }, }; +struct bxt_ddi_buf_trans { + u32 margin; /* swing value */ + u32 scale; /* scale value */ + u32 enable; /* scale enable */ + u32 deemphasis; + bool default_index; /* true if the entry represents default value */ +}; + +/* BSpec does not define separate vswing/pre-emphasis values for eDP. + * Using DP values for eDP as well. + */ +static const struct bxt_ddi_buf_trans bxt_ddi_translations_dp[] = { + /* Idx NT mV diff db */ + { 52, 0, 0, 128, true }, /* 0: 400 0 */ + { 78, 0, 0, 85, false }, /* 1: 400 3.5 */ + { 104, 0, 0, 64, false }, /* 2: 400 6 */ + { 154, 0, 0, 43, false }, /* 3: 400 9.5 */ + { 77, 0, 0, 128, false }, /* 4: 600 0 */ + { 116, 0, 0, 85, false }, /* 5: 600 3.5 */ + { 154, 0, 0, 64, false }, /* 6: 600 6 */ + { 102, 0, 0, 128, false }, /* 7: 800 0 */ + { 154, 0, 0, 85, false }, /* 8: 800 3.5 */ + { 154, 0x9A, 1, 128, false }, /* 9: 1200 0 */ +}; + +/* BSpec has 2 recommended values - entries 0 and 8. + * Using the entry with higher vswing. + */ +static const struct bxt_ddi_buf_trans bxt_ddi_translations_hdmi[] = { + /* Idx NT mV diff db */ + { 52, 0, 0, 128, false }, /* 0: 400 0 */ + { 52, 0, 0, 85, false }, /* 1: 400 3.5 */ + { 52, 0, 0, 64, false }, /* 2: 400 6 */ + { 42, 0, 0, 43, false }, /* 3: 400 9.5 */ + { 77, 0, 0, 128, false }, /* 4: 600 0 */ + { 77, 0, 0, 85, false }, /* 5: 600 3.5 */ + { 77, 0, 0, 64, false }, /* 6: 600 6 */ + { 102, 0, 0, 128, false }, /* 7: 800 0 */ + { 102, 0, 0, 85, false }, /* 8: 800 3.5 */ + { 154, 0x9A, 1, 128, true }, /* 9: 1200 0 */ +}; + enum port intel_ddi_get_encoder_port(struct intel_encoder *intel_encoder) { struct drm_encoder *encoder = &intel_encoder->base; @@ -219,7 +261,15 @@ static void intel_prepare_ddi_buffers(struct drm_device *dev, const struct ddi_buf_trans *ddi_translations_hdmi; const struct ddi_buf_trans *ddi_translations; - if (IS_SKYLAKE(dev)) { + if (IS_BROXTON(dev)) { + if (!intel_dig_port_supports_hdmi(intel_dig_port)) + return; + + /* Vswing programming for HDMI */ + bxt_ddi_vswing_sequence(dev, hdmi_level, port, + INTEL_OUTPUT_HDMI); + return; + } else if (IS_SKYLAKE(dev)) { ddi_translations_fdi = NULL; ddi_translations_dp = skl_ddi_translations_dp; n_dp_entries = ARRAY_SIZE(skl_ddi_translations_dp); @@ -1695,6 +1745,67 @@ void intel_ddi_disable_pipe_clock(struct intel_crtc *intel_crtc) TRANS_CLK_SEL_DISABLED); } +void bxt_ddi_vswing_sequence(struct drm_device *dev, u32 level, + enum port port, int type) +{ + struct drm_i915_private *dev_priv = dev->dev_private; + const struct bxt_ddi_buf_trans *ddi_translations; + u32 n_entries, i; + uint32_t val; + + if (type == INTEL_OUTPUT_DISPLAYPORT || type == INTEL_OUTPUT_EDP) { + n_entries = ARRAY_SIZE(bxt_ddi_translations_dp); + ddi_translations = bxt_ddi_translations_dp; + } else if (type == INTEL_OUTPUT_HDMI) { + n_entries = ARRAY_SIZE(bxt_ddi_translations_hdmi); + ddi_translations = bxt_ddi_translations_hdmi; + } else { + DRM_DEBUG_KMS("Vswing programming not done for encoder %d\n", + type); + return; + } + + /* Check if default value has to be used */ + if (level >= n_entries || + (type == INTEL_OUTPUT_HDMI && level == HDMI_LEVEL_SHIFT_UNKNOWN)) { + for (i = 0; i < n_entries; i++) { + if (ddi_translations[i].default_index) { + level = i; + break; + } + } + } + + /* + * While we write to the group register to program all lanes at once we + * can read only lane registers and we pick lanes 0/1 for that. + */ + val = I915_READ(BXT_PORT_PCS_DW10_LN01(port)); + val &= ~(TX2_SWING_CALC_INIT | TX1_SWING_CALC_INIT); + I915_WRITE(BXT_PORT_PCS_DW10_GRP(port), val); + + val = I915_READ(BXT_PORT_TX_DW2_LN0(port)); + val &= ~(MARGIN_000 | UNIQ_TRANS_SCALE); + val |= ddi_translations[level].margin << MARGIN_000_SHIFT | + ddi_translations[level].scale << UNIQ_TRANS_SCALE_SHIFT; + I915_WRITE(BXT_PORT_TX_DW2_GRP(port), val); + + val = I915_READ(BXT_PORT_TX_DW3_LN0(port)); + val &= ~UNIQE_TRANGE_EN_METHOD; + if (ddi_translations[level].enable) + val |= UNIQE_TRANGE_EN_METHOD; + I915_WRITE(BXT_PORT_TX_DW3_GRP(port), val); + + val = I915_READ(BXT_PORT_TX_DW4_LN0(port)); + val &= ~DE_EMPHASIS; + val |= ddi_translations[level].deemphasis << DEEMPH_SHIFT; + I915_WRITE(BXT_PORT_TX_DW4_GRP(port), val); + + val = I915_READ(BXT_PORT_PCS_DW10_LN01(port)); + val |= TX2_SWING_CALC_INIT | TX1_SWING_CALC_INIT; + I915_WRITE(BXT_PORT_PCS_DW10_GRP(port), val); +} + static void intel_ddi_pre_enable(struct intel_encoder *intel_encoder) { struct drm_encoder *encoder = &intel_encoder->base; @@ -1703,6 +1814,7 @@ static void intel_ddi_pre_enable(struct intel_encoder *intel_encoder) struct intel_crtc *crtc = to_intel_crtc(encoder->crtc); enum port port = intel_ddi_get_encoder_port(intel_encoder); int type = intel_encoder->type; + int hdmi_level; if (type == INTEL_OUTPUT_EDP) { struct intel_dp *intel_dp = enc_to_intel_dp(encoder); @@ -1759,6 +1871,12 @@ static void intel_ddi_pre_enable(struct intel_encoder *intel_encoder) } else if (type == INTEL_OUTPUT_HDMI) { struct intel_hdmi *intel_hdmi = enc_to_intel_hdmi(encoder); + if (IS_BROXTON(dev)) { + hdmi_level = dev_priv->vbt. + ddi_port_info[port].hdmi_level_shift; + bxt_ddi_vswing_sequence(dev, hdmi_level, port, + INTEL_OUTPUT_HDMI); + } intel_hdmi->set_infoframes(encoder, crtc->config->has_hdmi_sink, &crtc->config->base.adjusted_mode); diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 550ac9be1f58..2e27b5215a36 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -3409,6 +3409,55 @@ intel_hsw_signal_levels(uint8_t train_set) } } +static void intel_bxt_signal_levels(struct intel_dp *intel_dp) +{ + struct intel_digital_port *dport = dp_to_dig_port(intel_dp); + enum port port = dport->port; + struct drm_device *dev = dport->base.base.dev; + struct intel_encoder *encoder = &dport->base; + uint8_t train_set = intel_dp->train_set[0]; + uint32_t level = 0; + + int signal_levels = train_set & (DP_TRAIN_VOLTAGE_SWING_MASK | + DP_TRAIN_PRE_EMPHASIS_MASK); + switch (signal_levels) { + default: + DRM_DEBUG_KMS("Unsupported voltage swing/pre-emph level\n"); + case DP_TRAIN_VOLTAGE_SWING_LEVEL_0 | DP_TRAIN_PRE_EMPH_LEVEL_0: + level = 0; + break; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_0 | DP_TRAIN_PRE_EMPH_LEVEL_1: + level = 1; + break; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_0 | DP_TRAIN_PRE_EMPH_LEVEL_2: + level = 2; + break; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_0 | DP_TRAIN_PRE_EMPH_LEVEL_3: + level = 3; + break; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_1 | DP_TRAIN_PRE_EMPH_LEVEL_0: + level = 4; + break; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_1 | DP_TRAIN_PRE_EMPH_LEVEL_1: + level = 5; + break; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_1 | DP_TRAIN_PRE_EMPH_LEVEL_2: + level = 6; + break; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_2 | DP_TRAIN_PRE_EMPH_LEVEL_0: + level = 7; + break; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_2 | DP_TRAIN_PRE_EMPH_LEVEL_1: + level = 8; + break; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_3 | DP_TRAIN_PRE_EMPH_LEVEL_0: + level = 9; + break; + } + + bxt_ddi_vswing_sequence(dev, level, port, encoder->type); +} + /* Properly updates "DP" with the correct signal levels. */ static void intel_dp_set_signal_levels(struct intel_dp *intel_dp, uint32_t *DP) @@ -3419,7 +3468,11 @@ intel_dp_set_signal_levels(struct intel_dp *intel_dp, uint32_t *DP) uint32_t signal_levels, mask; uint8_t train_set = intel_dp->train_set[0]; - if (IS_HASWELL(dev) || IS_BROADWELL(dev) || INTEL_INFO(dev)->gen >= 9) { + if (IS_BROXTON(dev)) { + signal_levels = 0; + intel_bxt_signal_levels(intel_dp); + mask = 0; + } else if (HAS_DDI(dev)) { signal_levels = intel_hsw_signal_levels(train_set); mask = DDI_BUF_EMP_MASK; } else if (IS_CHERRYVIEW(dev)) { @@ -3439,7 +3492,14 @@ intel_dp_set_signal_levels(struct intel_dp *intel_dp, uint32_t *DP) mask = DP_VOLTAGE_MASK | DP_PRE_EMPHASIS_MASK; } - DRM_DEBUG_KMS("Using signal levels %08x\n", signal_levels); + if (mask) + DRM_DEBUG_KMS("Using signal levels %08x\n", signal_levels); + + DRM_DEBUG_KMS("Using vswing level %d\n", + train_set & DP_TRAIN_VOLTAGE_SWING_MASK); + DRM_DEBUG_KMS("Using pre-emphasis level %d\n", + (train_set & DP_TRAIN_PRE_EMPHASIS_MASK) >> + DP_TRAIN_PRE_EMPHASIS_SHIFT); *DP = (*DP & ~mask) | signal_levels; } diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h index 7e11a54f0d46..a7ec87266626 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -943,6 +943,8 @@ void intel_ddi_init_dp_buf_reg(struct intel_encoder *encoder); void intel_ddi_clock_get(struct intel_encoder *encoder, struct intel_crtc_state *pipe_config); void intel_ddi_set_vc_payload_alloc(struct drm_crtc *crtc, bool state); +void bxt_ddi_vswing_sequence(struct drm_device *dev, u32 level, + enum port port, int type); /* intel_frontbuffer.c */ void intel_fb_obj_invalidate(struct drm_i915_gem_object *obj, -- 2.30.2