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| author | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2018-05-17 20:03:06 +0300 |
|---|---|---|
| committer | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2018-05-18 17:23:40 +0300 |
| commit | 4718a365cf12094ed131089518003ac7ecb66743 (patch) | |
| tree | 05965bc2fec26041698ff43a8e9a8d600b3a0ec2 /drivers/gpu/drm/i915/intel_ddi.c | |
| parent | a393e9649582894078130f5741877bbafa0bd8a9 (diff) | |
| download | linux-4718a365cf12094ed131089518003ac7ecb66743.tar.bz2 | |
drm/i915: Use the same vswing->max_preemph mapping on HSW/BDW as on SKL+
All DDI platforms support the full set of preemph settings for each
supported vswing, so let's use the same code for them. We'll also move
the code into intel_ddi.c so that it sits closer to the actual buf trans
tables.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180517170309.28630-2-ville.syrjala@linux.intel.com
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Diffstat (limited to 'drivers/gpu/drm/i915/intel_ddi.c')
| -rw-r--r-- | drivers/gpu/drm/i915/intel_ddi.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c index b98ac0541f19..1665bc588241 100644 --- a/drivers/gpu/drm/i915/intel_ddi.c +++ b/drivers/gpu/drm/i915/intel_ddi.c @@ -2115,6 +2115,26 @@ u8 intel_ddi_dp_voltage_max(struct intel_encoder *encoder) DP_TRAIN_VOLTAGE_SWING_MASK; } +/* + * We assume that the full set of pre-emphasis values can be + * used on all DDI platforms. Should that change we need to + * rethink this code. + */ +u8 intel_ddi_dp_pre_emphasis_max(struct intel_encoder *encoder, u8 voltage_swing) +{ + switch (voltage_swing & DP_TRAIN_VOLTAGE_SWING_MASK) { + case DP_TRAIN_VOLTAGE_SWING_LEVEL_0: + return DP_TRAIN_PRE_EMPH_LEVEL_3; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_1: + return DP_TRAIN_PRE_EMPH_LEVEL_2; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_2: + return DP_TRAIN_PRE_EMPH_LEVEL_1; + case DP_TRAIN_VOLTAGE_SWING_LEVEL_3: + default: + return DP_TRAIN_PRE_EMPH_LEVEL_0; + } +} + static void cnl_ddi_vswing_program(struct intel_encoder *encoder, int level, enum intel_output_type type) { |