Whenever we are not able to get enough timeslots for required PBN, let's try to allocate those using DSC, just same way as we do for SST.
v2: Add DSC checks to intel_dp_mst_mode_valid_ctx, similar to ones we have in intel_dp_mode_valid(Manasi Navare)
v3: Removed redundant edp condition logic from MST DSC handling(Manasi Navare)
v4: - Fixed forgotten force_dsc_en condition which was always enabled for testing purposes(Manasi Navare) - Properly process ret == EDEADLK, thus fixing the regression caused by WARN triggered with modeset_lock.
v5: - Removed redundant check(Imre Deak)
v6: Removed intel_dp_mst_dsc_compute_config and refactored intel_dp_dsc_compute_config to support timeslots as a parameter(Ville Syrjälä)
Acked-by: Imre Deak imre.deak@intel.com Signed-off-by: Stanislav Lisovskiy stanislav.lisovskiy@intel.com --- drivers/gpu/drm/i915/display/intel_dp.c | 75 +++++----- drivers/gpu/drm/i915/display/intel_dp.h | 17 +++ drivers/gpu/drm/i915/display/intel_dp_mst.c | 143 ++++++++++++++++++++ 3 files changed, 191 insertions(+), 44 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index 9e19165fd175..b8e1561b5eca 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -115,7 +115,6 @@ bool intel_dp_is_edp(struct intel_dp *intel_dp) }
static void intel_dp_unset_edid(struct intel_dp *intel_dp); -static int intel_dp_dsc_compute_bpp(struct intel_dp *intel_dp, u8 dsc_max_bpc);
/* Is link rate UHBR and thus 128b/132b? */ bool intel_dp_is_uhbr(const struct intel_crtc_state *crtc_state) @@ -667,11 +666,12 @@ small_joiner_ram_size_bits(struct drm_i915_private *i915) return 6144 * 8; }
-static u16 intel_dp_dsc_get_output_bpp(struct drm_i915_private *i915, - u32 link_clock, u32 lane_count, - u32 mode_clock, u32 mode_hdisplay, - bool bigjoiner, - u32 pipe_bpp) +u16 intel_dp_dsc_get_output_bpp(struct drm_i915_private *i915, + u32 link_clock, u32 lane_count, + u32 mode_clock, u32 mode_hdisplay, + bool bigjoiner, + u32 pipe_bpp, + u32 timeslots) { u32 bits_per_pixel, max_bpp_small_joiner_ram; int i; @@ -683,7 +683,7 @@ static u16 intel_dp_dsc_get_output_bpp(struct drm_i915_private *i915, * for MST -> TimeSlotsPerMTP has to be calculated */ bits_per_pixel = (link_clock * lane_count * 8) / - intel_dp_mode_to_fec_clock(mode_clock); + (intel_dp_mode_to_fec_clock(mode_clock) * timeslots); drm_dbg_kms(&i915->drm, "Max link bpp: %u\n", bits_per_pixel);
/* Small Joiner Check: output bpp <= joiner RAM (bits) / Horiz. width */ @@ -737,9 +737,9 @@ static u16 intel_dp_dsc_get_output_bpp(struct drm_i915_private *i915, return bits_per_pixel << 4; }
-static u8 intel_dp_dsc_get_slice_count(struct intel_dp *intel_dp, - int mode_clock, int mode_hdisplay, - bool bigjoiner) +u8 intel_dp_dsc_get_slice_count(struct intel_dp *intel_dp, + int mode_clock, int mode_hdisplay, + bool bigjoiner) { struct drm_i915_private *i915 = dp_to_i915(intel_dp); u8 min_slice_count, i; @@ -902,8 +902,8 @@ intel_dp_mode_valid_downstream(struct intel_connector *connector, return MODE_OK; }
-static bool intel_dp_need_bigjoiner(struct intel_dp *intel_dp, - int hdisplay, int clock) +bool intel_dp_need_bigjoiner(struct intel_dp *intel_dp, + int hdisplay, int clock) { struct drm_i915_private *i915 = dp_to_i915(intel_dp);
@@ -990,7 +990,7 @@ intel_dp_mode_valid(struct drm_connector *connector, target_clock, mode->hdisplay, bigjoiner, - pipe_bpp) >> 4; + pipe_bpp, 1) >> 4; dsc_slice_count = intel_dp_dsc_get_slice_count(intel_dp, target_clock, @@ -1285,7 +1285,7 @@ intel_dp_compute_link_config_wide(struct intel_dp *intel_dp, return -EINVAL; }
-static int intel_dp_dsc_compute_bpp(struct intel_dp *intel_dp, u8 max_req_bpc) +int intel_dp_dsc_compute_bpp(struct intel_dp *intel_dp, u8 max_req_bpc) { struct drm_i915_private *i915 = dp_to_i915(intel_dp); int i, num_bpc; @@ -1375,10 +1375,11 @@ static int intel_dp_dsc_compute_params(struct intel_encoder *encoder, return drm_dsc_compute_rc_parameters(vdsc_cfg); }
-static int intel_dp_dsc_compute_config(struct intel_dp *intel_dp, - struct intel_crtc_state *pipe_config, - struct drm_connector_state *conn_state, - struct link_config_limits *limits) +int intel_dp_dsc_compute_config(struct intel_dp *intel_dp, + struct intel_crtc_state *pipe_config, + struct drm_connector_state *conn_state, + struct link_config_limits *limits, + int timeslots) { struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp); struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev); @@ -1429,7 +1430,8 @@ static int intel_dp_dsc_compute_config(struct intel_dp *intel_dp, adjusted_mode->crtc_clock, adjusted_mode->crtc_hdisplay, pipe_config->bigjoiner_pipes, - pipe_bpp); + pipe_bpp, + timeslots); dsc_dp_slice_count = intel_dp_dsc_get_slice_count(intel_dp, adjusted_mode->crtc_clock, @@ -1441,41 +1443,26 @@ static int intel_dp_dsc_compute_config(struct intel_dp *intel_dp, return -EINVAL; } pipe_config->dsc.compressed_bpp = min_t(u16, - dsc_max_output_bpp >> 4, - pipe_config->pipe_bpp); + dsc_max_output_bpp >> 4, + pipe_config->pipe_bpp); pipe_config->dsc.slice_count = dsc_dp_slice_count; + drm_dbg_kms(&dev_priv->drm, "DSC: compressed bpp %d slice count %d\n", + pipe_config->dsc.compressed_bpp, + pipe_config->dsc.slice_count); } - - /* As of today we support DSC for only RGB */ - if (intel_dp->force_dsc_bpp) { - if (intel_dp->force_dsc_bpp >= 8 && - intel_dp->force_dsc_bpp < pipe_bpp) { - drm_dbg_kms(&dev_priv->drm, - "DSC BPP forced to %d", - intel_dp->force_dsc_bpp); - pipe_config->dsc.compressed_bpp = - intel_dp->force_dsc_bpp; - } else { - drm_dbg_kms(&dev_priv->drm, - "Invalid DSC BPP %d", - intel_dp->force_dsc_bpp); - } - } - /* * VDSC engine operates at 1 Pixel per clock, so if peak pixel rate * is greater than the maximum Cdclock and if slice count is even * then we need to use 2 VDSC instances. */ - if (adjusted_mode->crtc_clock > dev_priv->max_cdclk_freq || - pipe_config->bigjoiner_pipes) { - if (pipe_config->dsc.slice_count < 2) { + if (adjusted_mode->crtc_clock > dev_priv->max_cdclk_freq) { + if (pipe_config->dsc.slice_count > 1) { + pipe_config->dsc.dsc_split = true; + } else { drm_dbg_kms(&dev_priv->drm, "Cannot split stream to use 2 VDSC instances\n"); return -EINVAL; } - - pipe_config->dsc.dsc_split = true; }
ret = intel_dp_dsc_compute_params(&dig_port->base, pipe_config); @@ -1558,7 +1545,7 @@ intel_dp_compute_link_config(struct intel_encoder *encoder, if (ret || intel_dp->force_dsc_en || (DISPLAY_VER(i915) < 13 && pipe_config->bigjoiner_pipes)) { ret = intel_dp_dsc_compute_config(intel_dp, pipe_config, - conn_state, &limits); + conn_state, &limits, 1); if (ret < 0) return ret; } diff --git a/drivers/gpu/drm/i915/display/intel_dp.h b/drivers/gpu/drm/i915/display/intel_dp.h index d457e17bdc57..4c0ad3158ee7 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.h +++ b/drivers/gpu/drm/i915/display/intel_dp.h @@ -55,6 +55,11 @@ void intel_dp_encoder_flush_work(struct drm_encoder *encoder); int intel_dp_compute_config(struct intel_encoder *encoder, struct intel_crtc_state *pipe_config, struct drm_connector_state *conn_state); +int intel_dp_dsc_compute_config(struct intel_dp *intel_dp, + struct intel_crtc_state *pipe_config, + struct drm_connector_state *conn_state, + struct link_config_limits *limits, + int timeslots); bool intel_dp_is_edp(struct intel_dp *intel_dp); bool intel_dp_is_uhbr(const struct intel_crtc_state *crtc_state); bool intel_dp_is_port_edp(struct drm_i915_private *dev_priv, enum port port); @@ -94,6 +99,18 @@ void intel_read_dp_sdp(struct intel_encoder *encoder, struct intel_crtc_state *crtc_state, unsigned int type); bool intel_digital_port_connected(struct intel_encoder *encoder); +int intel_dp_dsc_compute_bpp(struct intel_dp *intel_dp, u8 dsc_max_bpc); +u16 intel_dp_dsc_get_output_bpp(struct drm_i915_private *i915, + u32 link_clock, u32 lane_count, + u32 mode_clock, u32 mode_hdisplay, + bool bigjoiner, + u32 pipe_bpp, + u32 timeslots); +u8 intel_dp_dsc_get_slice_count(struct intel_dp *intel_dp, + int mode_clock, int mode_hdisplay, + bool bigjoiner); +bool intel_dp_need_bigjoiner(struct intel_dp *intel_dp, + int hdisplay, int clock);
static inline unsigned int intel_dp_unused_lane_mask(int lane_count) { diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c index e30e698aa684..778ca6283b8e 100644 --- a/drivers/gpu/drm/i915/display/intel_dp_mst.c +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c @@ -99,6 +99,82 @@ static int intel_dp_mst_compute_link_config(struct intel_encoder *encoder, return 0; }
+static int intel_dp_dsc_mst_compute_link_config(struct intel_encoder *encoder, + struct intel_crtc_state *crtc_state, + struct drm_connector_state *conn_state, + struct link_config_limits *limits) +{ + struct drm_atomic_state *state = crtc_state->uapi.state; + struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder); + struct intel_dp *intel_dp = &intel_mst->primary->dp; + struct intel_connector *connector = + to_intel_connector(conn_state->connector); + struct drm_i915_private *i915 = to_i915(connector->base.dev); + const struct drm_display_mode *adjusted_mode = + &crtc_state->hw.adjusted_mode; + bool constant_n = drm_dp_has_quirk(&intel_dp->desc, + DP_DPCD_QUIRK_CONSTANT_N); + int bpp, slots = -EINVAL; + int i, num_bpc; + u8 dsc_bpc[3] = {0}; + int min_bpp, max_bpp; + u8 dsc_max_bpc; + + crtc_state->lane_count = limits->max_lane_count; + crtc_state->port_clock = limits->max_rate; + + /* Max DSC Input BPC for ICL is 10 and for TGL+ is 12 */ + if (DISPLAY_VER(i915) >= 12) + dsc_max_bpc = min_t(u8, 12, conn_state->max_requested_bpc); + else + dsc_max_bpc = min_t(u8, 10, conn_state->max_requested_bpc); + + max_bpp = min_t(u8, dsc_max_bpc * 3, limits->max_bpp); + min_bpp = limits->min_bpp; + + num_bpc = drm_dp_dsc_sink_supported_input_bpcs(intel_dp->dsc_dpcd, + dsc_bpc); + for (i = 0; i < num_bpc; i++) { + if (max_bpp >= dsc_bpc[i] * 3) + if (min_bpp > dsc_bpc[i] * 3) + min_bpp = dsc_bpc[i] * 3; + } + drm_dbg_kms(&i915->drm, "DSC Sink supported min bpp %d max bpp %d\n", + min_bpp, max_bpp); + for (bpp = max_bpp; bpp >= min_bpp; bpp -= 2 * 3) { + crtc_state->pbn = drm_dp_calc_pbn_mode(adjusted_mode->crtc_clock, + bpp << 4, + true); + + slots = drm_dp_atomic_find_vcpi_slots(state, &intel_dp->mst_mgr, + connector->port, + crtc_state->pbn, 0); + + drm_dbg_kms(&i915->drm, "Trying bpp %d got %d pbn %d slots\n", + bpp, crtc_state->pbn, slots); + + if (slots == -EDEADLK) + return slots; + if (slots >= 0) + break; + } + + if (slots < 0) { + drm_dbg_kms(&i915->drm, "failed finding vcpi slots:%d\n", + slots); + return slots; + } + + intel_link_compute_m_n(crtc_state->pipe_bpp, + crtc_state->lane_count, + adjusted_mode->crtc_clock, + crtc_state->port_clock, + &crtc_state->dp_m_n, + constant_n, crtc_state->fec_enable); + crtc_state->dp_m_n.tu = slots; + + return 0; +} static int intel_dp_mst_update_slots(struct intel_encoder *encoder, struct intel_crtc_state *crtc_state, struct drm_connector_state *conn_state) @@ -175,6 +251,27 @@ static int intel_dp_mst_compute_config(struct intel_encoder *encoder,
ret = intel_dp_mst_compute_link_config(encoder, pipe_config, conn_state, &limits); + + if (ret == -EDEADLK) + return ret; + + /* enable compression if the mode doesn't fit available BW */ + drm_dbg_kms(&dev_priv->drm, "Force DSC en = %d\n", intel_dp->force_dsc_en); + if (ret || intel_dp->force_dsc_en) { + /* + * Try to get at least some timeslots and then see, if + * we can fit there with DSC. + */ + ret = intel_dp_dsc_mst_compute_link_config(encoder, pipe_config, + conn_state, &limits); + if (ret < 0) + return ret; + + ret = intel_dp_dsc_compute_config(intel_dp, pipe_config, + conn_state, &limits, + pipe_config->dp_m_n.tu); + } + if (ret) return ret;
@@ -715,6 +812,10 @@ intel_dp_mst_mode_valid_ctx(struct drm_connector *connector, int max_dotclk = to_i915(connector->dev)->max_dotclk_freq; int max_rate, mode_rate, max_lanes, max_link_clock; int ret; + bool dsc = false, bigjoiner = false; + u16 dsc_max_output_bpp = 0; + u8 dsc_slice_count = 0; + int target_clock = mode->clock;
if (drm_connector_is_unregistered(connector)) { *status = MODE_ERROR; @@ -752,6 +853,48 @@ intel_dp_mst_mode_valid_ctx(struct drm_connector *connector, return 0; }
+ if (intel_dp_need_bigjoiner(intel_dp, mode->hdisplay, target_clock)) { + bigjoiner = true; + max_dotclk *= 2; + } + + if (DISPLAY_VER(dev_priv) >= 10 && + drm_dp_sink_supports_dsc(intel_dp->dsc_dpcd)) { + /* + * TBD pass the connector BPC, + * for now U8_MAX so that max BPC on that platform would be picked + */ + int pipe_bpp = intel_dp_dsc_compute_bpp(intel_dp, U8_MAX); + + if (drm_dp_sink_supports_fec(intel_dp->fec_capable)) { + dsc_max_output_bpp = + intel_dp_dsc_get_output_bpp(dev_priv, + max_link_clock, + max_lanes, + target_clock, + mode->hdisplay, + bigjoiner, + pipe_bpp, 1) >> 4; + dsc_slice_count = + intel_dp_dsc_get_slice_count(intel_dp, + target_clock, + mode->hdisplay, + bigjoiner); + } + + dsc = dsc_max_output_bpp && dsc_slice_count; + } + + /* + * Big joiner configuration needs DSC for TGL which is not true for + * XE_LPD where uncompressed joiner is supported. + */ + if (DISPLAY_VER(dev_priv) < 13 && bigjoiner && !dsc) + return MODE_CLOCK_HIGH; + + if (mode_rate > max_rate && !dsc) + return MODE_CLOCK_HIGH; + *status = intel_mode_valid_max_plane_size(dev_priv, mode, false); return 0; }