From 240999cf339f146d186dfb1a82ac6ba77ef34a1a Mon Sep 17 00:00:00 2001 From: Anusha Srivatsa Date: Wed, 28 Nov 2018 12:26:25 -0800 Subject: [PATCH] i915/dp/fec: Add fec_enable to the crtc state. For DP 1.4 and above, Display Stream compression can be enabled only if Forward Error Correctin can be performed. Add a crtc state for FEC. Currently, the state is determined by platform, DP and DSC being enabled. Moving forward we can use the state to have error correction on other scenarios too if needed. v2: - Control compression_enable with the fec_enable parameter in crtc state and with intel_dp_supports_fec() (Ville) - intel_dp_can_fec()/intel_dp_supports_fec()(manasi) v3: Check for FEC support along with setting crtc state. v4: add checks to intel_dp_source_supports_dsc.(manasi) - Move intel_dp_supports_fec() closer to intel_dp_supports_dsc() (Anusha) v5: Move fec check to intel_dp_supports_dsc(Ville) v6: Remove warning. rebase. v7: change crtc state to include DP sink and fec capability of source.(Manasi) v8: Set fec_enable in crtc in intel_dp_compute_config(). v9 (From Manasi): * Combine the !edp and !fec_support check * Derive dev_priv from intel_dp directly v10 (From Manasi): * Rebase Suggested-by: Ville Syrjala Cc: dri-devel@lists.freedesktop.org Cc: Ville Syrjala Cc: Jani Nikula Cc: Manasi Navare Signed-off-by: Anusha Srivatsa Signed-off-by: Manasi Navare Reviewed-by: Manasi Navare Link: https://patchwork.freedesktop.org/patch/msgid/20181128202628.20238-14-manasi.d.navare@intel.com --- drivers/gpu/drm/i915/intel_dp.c | 28 +++++++++++++++++++++++----- drivers/gpu/drm/i915/intel_drv.h | 3 +++ 2 files changed, 26 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c index 4e65dd1a6c07..38a6e82153fd 100644 --- a/drivers/gpu/drm/i915/intel_dp.c +++ b/drivers/gpu/drm/i915/intel_dp.c @@ -545,7 +545,7 @@ intel_dp_mode_valid(struct drm_connector *connector, dsc_slice_count = drm_dp_dsc_sink_max_slice_count(intel_dp->dsc_dpcd, true); - } else { + } else if (drm_dp_sink_supports_fec(intel_dp->fec_capable)) { dsc_max_output_bpp = intel_dp_dsc_get_output_bpp(max_link_clock, max_lanes, @@ -1710,14 +1710,26 @@ struct link_config_limits { int min_bpp, max_bpp; }; -static bool intel_dp_source_supports_dsc(struct intel_dp *intel_dp, +static bool intel_dp_source_supports_fec(struct intel_dp *intel_dp, const struct intel_crtc_state *pipe_config) { struct drm_i915_private *dev_priv = dp_to_i915(intel_dp); - /* FIXME: FEC needed for external DP until then reject DSC on DP */ - if (!intel_dp_is_edp(intel_dp)) - return false; + return INTEL_GEN(dev_priv) >= 11 && + pipe_config->cpu_transcoder != TRANSCODER_A; +} + +static bool intel_dp_supports_fec(struct intel_dp *intel_dp, + const struct intel_crtc_state *pipe_config) +{ + return intel_dp_source_supports_fec(intel_dp, pipe_config) && + drm_dp_sink_supports_fec(intel_dp->fec_capable); +} + +static bool intel_dp_source_supports_dsc(struct intel_dp *intel_dp, + const struct intel_crtc_state *pipe_config) +{ + struct drm_i915_private *dev_priv = dp_to_i915(intel_dp); return INTEL_GEN(dev_priv) >= 10 && pipe_config->cpu_transcoder != TRANSCODER_A; @@ -1726,6 +1738,9 @@ static bool intel_dp_source_supports_dsc(struct intel_dp *intel_dp, static bool intel_dp_supports_dsc(struct intel_dp *intel_dp, const struct intel_crtc_state *pipe_config) { + if (!intel_dp_is_edp(intel_dp) && !pipe_config->fec_enable) + return false; + return intel_dp_source_supports_dsc(intel_dp, pipe_config) && drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd); } @@ -2129,6 +2144,9 @@ intel_dp_compute_config(struct intel_encoder *encoder, if (adjusted_mode->flags & DRM_MODE_FLAG_DBLCLK) return false; + pipe_config->fec_enable = !intel_dp_is_edp(intel_dp) && + intel_dp_supports_fec(intel_dp, pipe_config); + if (!intel_dp_compute_link_config(encoder, pipe_config, conn_state)) return false; diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h index 0623dc8ab115..86ff57738cd9 100644 --- a/drivers/gpu/drm/i915/intel_drv.h +++ b/drivers/gpu/drm/i915/intel_drv.h @@ -951,6 +951,9 @@ struct intel_crtc_state { u8 slice_count; } dsc_params; struct drm_dsc_config dp_dsc_cfg; + + /* Forward Error correction State */ + bool fec_enable; }; struct intel_crtc { -- 2.11.0