From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 45690C369C2 for ; Thu, 24 Apr 2025 15:29:52 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 9B62F10E83E; Thu, 24 Apr 2025 15:29:51 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="RlyESFdZ"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.15]) by gabe.freedesktop.org (Postfix) with ESMTPS id 72FD610E83C; Thu, 24 Apr 2025 15:29:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1745508589; x=1777044589; h=from:date:subject:mime-version:content-transfer-encoding: message-id:references:in-reply-to:to:cc; bh=DzMKeZqLdsML+GFY+qdYE8fILG99X5MlSUvNK7o8zqE=; b=RlyESFdZ6t6Voc23VbjUSArHB2WWpFyR4c22viubUCAWVo3OMh8ZcGKF JnjaP5VwRO+5I9zj+KjvGcySfDzZV/8MrpqnfsQshvQieMUj+/cHvYP94 bNmQU9E2vyIE0s+h4EH35/WC9hJSw8A6I7W6rEIVCz5rBq5U7P+r1NwTk zOC66kKdSDdDbNtbTiPNfY8nAU7fVXdl62xC+bJo/KIAT0UV/TCrtdCZn Nx1FVubavPckj0733LJQu7rcRA+tWFsXNpeHX8IIcty5F8pTvwbKpcefU 8Mlqi224SzBXtEbwlJ4kPnj7ex8vUEE+TCA6qqu+ffLAH0+D6Ppi3/VSD A==; X-CSE-ConnectionGUID: UVlbamQVQfuftUY2AbgxsQ== X-CSE-MsgGUID: GUyVUReyR+GW2U9jhrmklQ== X-IronPort-AV: E=McAfee;i="6700,10204,11413"; a="50816452" X-IronPort-AV: E=Sophos;i="6.15,236,1739865600"; d="scan'208";a="50816452" Received: from fmviesa004.fm.intel.com ([10.60.135.144]) by orvoesa107.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 24 Apr 2025 08:29:49 -0700 X-CSE-ConnectionGUID: SIFOcZWCROaQmVTKChr9tw== X-CSE-MsgGUID: mfUQjlbQTX6GpFzNkvNr6A== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.15,236,1739865600"; d="scan'208";a="137748319" Received: from srr4-3-linux-106-armuthy.iind.intel.com ([10.190.238.56]) by fmviesa004.fm.intel.com with ESMTP; 24 Apr 2025 08:29:47 -0700 From: Arun R Murthy Date: Thu, 24 Apr 2025 20:45:15 +0530 Subject: [PATCH v7 2/2] drm/i915/display: move min_hblank from dp_mst.c to dp.c MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20250424-hblank-v7-2-8b002f1506cc@intel.com> References: <20250424-hblank-v7-0-8b002f1506cc@intel.com> In-Reply-To: <20250424-hblank-v7-0-8b002f1506cc@intel.com> To: intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org, dri-devel@lists.freedesktop.org Cc: imre.deak@intel.com, vinod.govindapillai@intel.com, Arun R Murthy X-Mailer: b4 0.15-dev X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Minimum HBlank is programmed to address jitter for high resolutions with high refresh rates that have small Hblank, specifically where Hblank is smaller than one MTP. TODO: Add the min_hblank calculation for hdmi as well. v2: move from intel_audio.c to intel_dp.c some correction in link_bpp_x16 (Imre) v3: min_hblank for 8b/10b MST and 128b/132b SST/MST handle error for intel_dp_mst_dsc_get_slice_count reset min_hblank before disabling transcoder (Imre) v4: compute link_bpp_x16 within compute_min_hblank, return error in case of compute failure call compute_min_hblank() before vrr_compute_config (Imre) v5: readout MIN_HBLAN reg for Xe3+ Reviewed-by: Imre Deak Signed-off-by: Arun R Murthy --- drivers/gpu/drm/i915/display/intel_display.c | 19 +++++++ drivers/gpu/drm/i915/display/intel_dp.c | 74 ++++++++++++++++++++++++++++ drivers/gpu/drm/i915/display/intel_dp.h | 2 + drivers/gpu/drm/i915/display/intel_dp_mst.c | 56 ++------------------- 4 files changed, 100 insertions(+), 51 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c index 33c09999c42e046c7a8b6e6143be0b81650ee7f7..fa8cbc528ef0016efeca3aa727a4fab167169247 100644 --- a/drivers/gpu/drm/i915/display/intel_display.c +++ b/drivers/gpu/drm/i915/display/intel_display.c @@ -2723,6 +2723,19 @@ static void intel_set_transcoder_timings(const struct intel_crtc_state *crtc_sta intel_de_write(display, TRANS_VTOTAL(display, pipe), VACTIVE(crtc_vdisplay - 1) | VTOTAL(crtc_vtotal - 1)); + + if (DISPLAY_VER(display) >= 30) { + /* + * Address issues for resolutions with high refresh rate that + * have small Hblank, specifically where Hblank is smaller than + * one MTP. Simulations indicate this will address the + * jitter issues that currently causes BS to be immediately + * followed by BE which DPRX devices are unable to handle. + * https://groups.vesa.org/wg/DP/document/20494 + */ + intel_de_write(display, DP_MIN_HBLANK_CTL(cpu_transcoder), + crtc_state->min_hblank); + } } static void intel_set_transcoder_timings_lrr(const struct intel_crtc_state *crtc_state) @@ -2866,6 +2879,10 @@ static void intel_get_transcoder_timings(struct intel_crtc *crtc, adjusted_mode->crtc_vdisplay + intel_de_read(display, TRANS_SET_CONTEXT_LATENCY(display, cpu_transcoder)); + + if (DISPLAY_VER(display) >= 30) + pipe_config->min_hblank = intel_de_read(display, + DP_MIN_HBLANK_CTL(cpu_transcoder)); } static void intel_joiner_adjust_pipe_src(struct intel_crtc_state *crtc_state) @@ -5216,6 +5233,8 @@ intel_pipe_config_compare(const struct intel_crtc_state *current_config, PIPE_CONF_CHECK_I(lane_count); PIPE_CONF_CHECK_X(lane_lat_optim_mask); + PIPE_CONF_CHECK_I(min_hblank); + if (HAS_DOUBLE_BUFFERED_M_N(display)) { if (!fastset || !pipe_config->update_m_n) PIPE_CONF_CHECK_M_N(dp_m_n); diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index d7a30d0992b7a65250a3abfecde876321326fa84..f937cb4a4ca32844d0d34bf19d5fdf7c0e0c209b 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -3104,6 +3104,76 @@ intel_dp_queue_modeset_retry_for_link(struct intel_atomic_state *state, } } +int intel_dp_compute_min_hblank(struct intel_crtc_state *crtc_state, + const struct drm_connector_state *conn_state) +{ + struct intel_display *display = to_intel_display(crtc_state); + const struct drm_display_mode *adjusted_mode = + &crtc_state->hw.adjusted_mode; + struct intel_connector *connector = to_intel_connector(conn_state->connector); + int symbol_size = intel_dp_is_uhbr(crtc_state) ? 32 : 8; + /* + * min symbol cycles is 3(BS,VBID, BE) for 128b/132b and + * 5(BS, VBID, MVID, MAUD, BE) for 8b/10b + */ + int min_sym_cycles = intel_dp_is_uhbr(crtc_state) ? 3 : 5; + bool is_mst = intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DP_MST); + int num_joined_pipes = intel_crtc_num_joined_pipes(crtc_state); + int min_hblank; + int max_lane_count = 4; + int hactive_sym_cycles, htotal_sym_cycles; + int dsc_slices = 0; + int link_bpp_x16; + + if (DISPLAY_VER(display) < 30) + return 0; + + /* MIN_HBLANK should be set only for 8b/10b MST or for 128b/132b SST/MST */ + if (!is_mst && !intel_dp_is_uhbr(crtc_state)) + return 0; + + if (crtc_state->dsc.compression_enable) { + dsc_slices = intel_dp_dsc_get_slice_count(connector, + adjusted_mode->crtc_clock, + adjusted_mode->crtc_hdisplay, + num_joined_pipes); + if (!dsc_slices) { + drm_dbg(display->drm, "failed to calculate dsc slice count\n"); + return -EINVAL; + } + } + + if (crtc_state->dsc.compression_enable) + link_bpp_x16 = crtc_state->dsc.compressed_bpp_x16; + else + link_bpp_x16 = fxp_q4_from_int(intel_dp_output_bpp(crtc_state->output_format, + crtc_state->pipe_bpp)); + + /* Calculate min Hblank Link Layer Symbol Cycle Count for 8b/10b MST & 128b/132b */ + hactive_sym_cycles = drm_dp_link_symbol_cycles(max_lane_count, + adjusted_mode->hdisplay, + dsc_slices, + link_bpp_x16, + symbol_size, is_mst); + htotal_sym_cycles = adjusted_mode->htotal * hactive_sym_cycles / + adjusted_mode->hdisplay; + + min_hblank = htotal_sym_cycles - hactive_sym_cycles; + /* minimum Hblank calculation: https://groups.vesa.org/wg/DP/document/20494 */ + min_hblank = max(min_hblank, min_sym_cycles); + + /* + * adjust the BlankingStart/BlankingEnd framing control from + * the calculated value + */ + min_hblank = min_hblank - 2; + + min_hblank = min(10, min_hblank); + crtc_state->min_hblank = min_hblank; + + return 0; +} + int intel_dp_compute_config(struct intel_encoder *encoder, struct intel_crtc_state *pipe_config, @@ -3203,6 +3273,10 @@ intel_dp_compute_config(struct intel_encoder *encoder, &pipe_config->dp_m_n); } + ret = intel_dp_compute_min_hblank(pipe_config, conn_state); + if (ret) + return ret; + /* FIXME: abstract this better */ if (pipe_config->splitter.enable) pipe_config->dp_m_n.data_m *= pipe_config->splitter.link_count; diff --git a/drivers/gpu/drm/i915/display/intel_dp.h b/drivers/gpu/drm/i915/display/intel_dp.h index 9189db4c25946a0f082223ce059c242e80cc32dc..a7cc10800e0b42ecd888db2f3ff63a755b6cab73 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.h +++ b/drivers/gpu/drm/i915/display/intel_dp.h @@ -208,5 +208,7 @@ bool intel_dp_has_connector(struct intel_dp *intel_dp, const struct drm_connector_state *conn_state); int intel_dp_dsc_max_src_input_bpc(struct intel_display *display); int intel_dp_dsc_min_src_input_bpc(void); +int intel_dp_compute_min_hblank(struct intel_crtc_state *crtc_state, + const struct drm_connector_state *conn_state); #endif /* __INTEL_DP_H__ */ diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c index 4c15dcb103aa2ed5650cbbef8c12be53132e6a80..566ac7e3cbff5dcf7ce4f3b8b9a0fee208f11190 100644 --- a/drivers/gpu/drm/i915/display/intel_dp_mst.c +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c @@ -239,26 +239,6 @@ static int intel_dp_mst_dsc_get_slice_count(const struct intel_connector *connec num_joined_pipes); } -static void intel_dp_mst_compute_min_hblank(struct intel_crtc_state *crtc_state, - int bpp_x16) -{ - struct intel_display *display = to_intel_display(crtc_state); - const struct drm_display_mode *adjusted_mode = - &crtc_state->hw.adjusted_mode; - int symbol_size = intel_dp_is_uhbr(crtc_state) ? 32 : 8; - int hblank; - - if (DISPLAY_VER(display) < 20) - return; - - /* Calculate min Hblank Link Layer Symbol Cycle Count for 8b/10b MST & 128b/132b */ - hblank = DIV_ROUND_UP((DIV_ROUND_UP - (adjusted_mode->htotal - adjusted_mode->hdisplay, 4) * bpp_x16), - symbol_size); - - crtc_state->min_hblank = hblank; -} - int intel_dp_mtp_tu_compute_config(struct intel_dp *intel_dp, struct intel_crtc_state *crtc_state, struct drm_connector_state *conn_state, @@ -329,8 +309,6 @@ int intel_dp_mtp_tu_compute_config(struct intel_dp *intel_dp, local_bw_overhead = intel_dp_mst_bw_overhead(crtc_state, false, dsc_slice_count, link_bpp_x16); - intel_dp_mst_compute_min_hblank(crtc_state, link_bpp_x16); - intel_dp_mst_compute_m_n(crtc_state, local_bw_overhead, link_bpp_x16, @@ -739,6 +717,10 @@ static int mst_stream_compute_config(struct intel_encoder *encoder, pipe_config->lane_lat_optim_mask = bxt_dpio_phy_calc_lane_lat_optim_mask(pipe_config->lane_count); + ret = intel_dp_compute_min_hblank(pipe_config, conn_state); + if (ret) + return ret; + intel_vrr_compute_config(pipe_config, conn_state); intel_dp_audio_compute_config(encoder, pipe_config, conn_state); @@ -1021,12 +1003,10 @@ static void mst_stream_disable(struct intel_atomic_state *state, const struct intel_crtc_state *old_crtc_state, const struct drm_connector_state *old_conn_state) { - struct intel_display *display = to_intel_display(state); struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder); struct intel_dp *intel_dp = to_primary_dp(encoder); struct intel_connector *connector = to_intel_connector(old_conn_state->connector); - enum transcoder trans = old_crtc_state->cpu_transcoder; if (intel_dp_mst_active_streams(intel_dp) == 1) intel_dp->link.active = false; @@ -1034,9 +1014,6 @@ static void mst_stream_disable(struct intel_atomic_state *state, intel_hdcp_disable(intel_mst->connector); intel_dp_sink_disable_decompression(state, connector, old_crtc_state); - - if (DISPLAY_VER(display) >= 20) - intel_de_write(display, DP_MIN_HBLANK_CTL(trans), 0); } static void mst_stream_post_disable(struct intel_atomic_state *state, @@ -1305,7 +1282,7 @@ static void mst_stream_enable(struct intel_atomic_state *state, enum transcoder trans = pipe_config->cpu_transcoder; bool first_mst_stream = intel_dp_mst_active_streams(intel_dp) == 1; struct intel_crtc *pipe_crtc; - int ret, i, min_hblank; + int ret, i; drm_WARN_ON(display->drm, pipe_config->has_pch_encoder); @@ -1320,29 +1297,6 @@ static void mst_stream_enable(struct intel_atomic_state *state, TRANS_DP2_VFREQ_PIXEL_CLOCK(crtc_clock_hz & 0xffffff)); } - if (DISPLAY_VER(display) >= 20) { - /* - * adjust the BlankingStart/BlankingEnd framing control from - * the calculated value - */ - min_hblank = pipe_config->min_hblank - 2; - - /* Maximum value to be programmed is limited to 0x10 */ - min_hblank = min(0x10, min_hblank); - - /* - * Minimum hblank accepted for 128b/132b would be 5 and for - * 8b/10b would be 3 symbol count - */ - if (intel_dp_is_uhbr(pipe_config)) - min_hblank = max(min_hblank, 5); - else - min_hblank = max(min_hblank, 3); - - intel_de_write(display, DP_MIN_HBLANK_CTL(trans), - min_hblank); - } - enable_bs_jitter_was(pipe_config); intel_ddi_enable_transcoder_func(encoder, pipe_config); -- 2.25.1