From: Ville Syrjälä Date: Tue, 12 May 2020 17:41:41 +0000 (+0300) Subject: drm/i915: Fix ivb cpu edp vswing X-Git-Tag: v5.10.7~1861^2~24^2~110 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=33520eae45f1c97670c8de7adec1cb5ab6a94416;p=platform%2Fkernel%2Flinux-rpi.git drm/i915: Fix ivb cpu edp vswing According to the DP spec supporting vswing 1 + preemph 2 is mandatory. We don't have the hw settings for that though. In order to pretend to follow the DP spec let's just select vswing 0 + preemph 2 in this case (the DP spec says to use the requested preemph in preference to the vswing when the requested values aren't supported). Signed-off-by: Ville Syrjälä Link: https://patchwork.freedesktop.org/patch/msgid/20200512174145.3186-4-ville.syrjala@linux.intel.com Reviewed-by: José Roberto de Souza --- diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index 67cb712..04fc070 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -4003,8 +4003,6 @@ intel_dp_voltage_max(struct intel_dp *intel_dp) else if (IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv) || (HAS_PCH_SPLIT(dev_priv) && port != PORT_A)) return DP_TRAIN_VOLTAGE_SWING_LEVEL_3; - else if (IS_IVYBRIDGE(dev_priv) && port == PORT_A) - return DP_TRAIN_VOLTAGE_SWING_LEVEL_2; else return DP_TRAIN_VOLTAGE_SWING_LEVEL_2; } @@ -4031,16 +4029,6 @@ intel_dp_pre_emphasis_max(struct intel_dp *intel_dp, u8 voltage_swing) default: return DP_TRAIN_PRE_EMPH_LEVEL_0; } - } else if (IS_IVYBRIDGE(dev_priv) && port == PORT_A) { - switch (voltage_swing & DP_TRAIN_VOLTAGE_SWING_MASK) { - case DP_TRAIN_VOLTAGE_SWING_LEVEL_0: - return DP_TRAIN_PRE_EMPH_LEVEL_2; - case DP_TRAIN_VOLTAGE_SWING_LEVEL_1: - case DP_TRAIN_VOLTAGE_SWING_LEVEL_2: - return DP_TRAIN_PRE_EMPH_LEVEL_1; - default: - return DP_TRAIN_PRE_EMPH_LEVEL_0; - } } else { switch (voltage_swing & DP_TRAIN_VOLTAGE_SWING_MASK) { case DP_TRAIN_VOLTAGE_SWING_LEVEL_0: @@ -4336,6 +4324,7 @@ static u32 ivb_cpu_edp_signal_levels(u8 train_set) case DP_TRAIN_VOLTAGE_SWING_LEVEL_0 | DP_TRAIN_PRE_EMPH_LEVEL_1: return EDP_LINK_TRAIN_400MV_3_5DB_IVB; case DP_TRAIN_VOLTAGE_SWING_LEVEL_0 | DP_TRAIN_PRE_EMPH_LEVEL_2: + case DP_TRAIN_VOLTAGE_SWING_LEVEL_1 | DP_TRAIN_PRE_EMPH_LEVEL_2: return EDP_LINK_TRAIN_400MV_6DB_IVB; case DP_TRAIN_VOLTAGE_SWING_LEVEL_1 | DP_TRAIN_PRE_EMPH_LEVEL_0: