From patchwork Mon Aug 22 09:40:36 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stanislav Lisovskiy X-Patchwork-Id: 12950434 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 B8365C28D13 for ; Mon, 22 Aug 2022 09:41:00 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 66B0010EA5A; Mon, 22 Aug 2022 09:40:22 +0000 (UTC) Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by gabe.freedesktop.org (Postfix) with ESMTPS id D775310E1C9; Mon, 22 Aug 2022 09:39:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1661161199; x=1692697199; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=U73AnDep73YO2XJNE4CaSMbQa/kfRx40JcjI7QeZNKU=; b=lM8k1efIVXpXExQ6MB4oF6xQPe65X3XD+whFqeX2UDYleHBbO88U7guh 0p1Waimo26OZoVrKrwuXnt16m39nl5NYj33hC0I2QPYFY3FQvgWbA6X8I YUV6avcM5sUJH5lwzkDl59PGtUv/LdAdyX3NX3M8xVIBd0MyjHHjdqVvj Xot7tFPetdpie2d0UxJP+eKp1lYWA3hl0a6byqrTsUN4WeCeIwDB6dEuh +1595rq4wOQR0XKpOJxkbxW4j495aEOJz7X78Vg/z79GvUyedvZuKJd/Y x9+0LGwefeyEJXZX1XOsblN4KJpUTdmz++TssgCoAfwInDjd/1VOgffML Q==; X-IronPort-AV: E=McAfee;i="6500,9779,10446"; a="379661157" X-IronPort-AV: E=Sophos;i="5.93,254,1654585200"; d="scan'208";a="379661157" Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Aug 2022 02:39:55 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.93,254,1654585200"; d="scan'208";a="677147063" Received: from unknown (HELO slisovsk-Lenovo-ideapad-720S-13IKB.fi.intel.com) ([10.237.72.65]) by fmsmga004.fm.intel.com with ESMTP; 22 Aug 2022 02:39:53 -0700 From: Stanislav Lisovskiy To: intel-gfx@lists.freedesktop.org Subject: [PATCH 1/2] drm: Add missing DP DSC extended capability definitions. Date: Mon, 22 Aug 2022 12:40:36 +0300 Message-Id: <20220822094037.15483-2-stanislav.lisovskiy@intel.com> X-Mailer: git-send-email 2.24.1.485.gad05a3d8e5 In-Reply-To: <20220822094037.15483-1-stanislav.lisovskiy@intel.com> References: <20220822094037.15483-1-stanislav.lisovskiy@intel.com> MIME-Version: 1.0 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: , Cc: Stanislav.Lisovskiy@intel.com, jani.nikula@intel.com, manasi.d.navare@intel.com, jani.saarinen@intel.com, dri-devel@lists.freedesktop.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Adding DP DSC register definitions, we might need for further DSC implementation, supporting MST and DP branch pass-through mode. v2: - Fixed checkpatch comment warning v3: - Removed function which is not yet used(Jani Nikula) Signed-off-by: Stanislav Lisovskiy Reviewed-by: Vinod Govindapillai --- include/drm/display/drm_dp.h | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/include/drm/display/drm_dp.h b/include/drm/display/drm_dp.h index 9e3aff7e68bb..0d05e3172f96 100644 --- a/include/drm/display/drm_dp.h +++ b/include/drm/display/drm_dp.h @@ -239,6 +239,9 @@ #define DP_DSC_SUPPORT 0x060 /* DP 1.4 */ # define DP_DSC_DECOMPRESSION_IS_SUPPORTED (1 << 0) +# define DP_DSC_PASS_THROUGH_IS_SUPPORTED (1 << 1) +# define DP_DSC_DYNAMIC_PPS_UPDATE_SUPPORT_COMP_TO_COMP (1 << 2) +# define DP_DSC_DYNAMIC_PPS_UPDATE_SUPPORT_UNCOMP_TO_COMP (1 << 3) #define DP_DSC_REV 0x061 # define DP_DSC_MAJOR_MASK (0xf << 0) @@ -277,12 +280,15 @@ #define DP_DSC_BLK_PREDICTION_SUPPORT 0x066 # define DP_DSC_BLK_PREDICTION_IS_SUPPORTED (1 << 0) +# define DP_DSC_RGB_COLOR_CONV_BYPASS_SUPPORT (1 << 1) #define DP_DSC_MAX_BITS_PER_PIXEL_LOW 0x067 /* eDP 1.4 */ #define DP_DSC_MAX_BITS_PER_PIXEL_HI 0x068 /* eDP 1.4 */ # define DP_DSC_MAX_BITS_PER_PIXEL_HI_MASK (0x3 << 0) # define DP_DSC_MAX_BITS_PER_PIXEL_HI_SHIFT 8 +# define DP_DSC_MAX_BPP_DELTA_VERSION_MASK 0x06 +# define DP_DSC_MAX_BPP_DELTA_AVAILABILITY 0x08 #define DP_DSC_DEC_COLOR_FORMAT_CAP 0x069 # define DP_DSC_RGB (1 << 0) @@ -344,11 +350,13 @@ # define DP_DSC_24_PER_DP_DSC_SINK (1 << 2) #define DP_DSC_BITS_PER_PIXEL_INC 0x06F +# define DP_DSC_RGB_YCbCr444_MAX_BPP_DELTA_MASK 0x1f +# define DP_DSC_RGB_YCbCr420_MAX_BPP_DELTA_MASK 0xe0 # define DP_DSC_BITS_PER_PIXEL_1_16 0x0 # define DP_DSC_BITS_PER_PIXEL_1_8 0x1 # define DP_DSC_BITS_PER_PIXEL_1_4 0x2 # define DP_DSC_BITS_PER_PIXEL_1_2 0x3 -# define DP_DSC_BITS_PER_PIXEL_1 0x4 +# define DP_DSC_BITS_PER_PIXEL_1_1 0x4 #define DP_PSR_SUPPORT 0x070 /* XXX 1.2? */ # define DP_PSR_IS_SUPPORTED 1 From patchwork Mon Aug 22 09:40:37 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Stanislav Lisovskiy X-Patchwork-Id: 12950432 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 96887C28D13 for ; Mon, 22 Aug 2022 09:40:38 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 0A90810E1C9; Mon, 22 Aug 2022 09:40:14 +0000 (UTC) Received: from mga05.intel.com (mga05.intel.com [192.55.52.43]) by gabe.freedesktop.org (Postfix) with ESMTPS id 0746210E4D5; Mon, 22 Aug 2022 09:40:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1661161200; x=1692697200; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=1z6nMv/Qqgm9gaNLCvFzkqCob/xswt3rtnG8D9K8R5M=; b=YTYVqC3BtCgs7gzB3P/dEGlTTSoy4+IvW/VOYstRI0IlrQGGNEcPCiRM pk83N+putDh59ylfdJZNEzh+IoTM1TP1Uu+jIgx8ksP79BxxUGlPqcNuz cTNSWT4oG9gRIfCUf/Hao7Wmk4MvQDRXEwTEsJYN+Vj5Gk5PSBRxarAMx im6g+gZEB+NuzR/HBwnNs4lqwK6Wulmb872K4Em0WVbyJKuJWrm8u8plj SX8qRCeNr3CRfngRTvR9tmwn8hGom58jg/GXKVM9M6WfpXgJ0JFvfEQyL Ml8xYVcn/p1cweMx7JcJz23fzFLyXwQCygXd8/+iQmZxgwhWhOilcausu g==; X-IronPort-AV: E=McAfee;i="6500,9779,10446"; a="379661161" X-IronPort-AV: E=Sophos;i="5.93,254,1654585200"; d="scan'208";a="379661161" Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga105.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 22 Aug 2022 02:39:57 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.93,254,1654585200"; d="scan'208";a="677147066" Received: from unknown (HELO slisovsk-Lenovo-ideapad-720S-13IKB.fi.intel.com) ([10.237.72.65]) by fmsmga004.fm.intel.com with ESMTP; 22 Aug 2022 02:39:55 -0700 From: Stanislav Lisovskiy To: intel-gfx@lists.freedesktop.org Subject: [PATCH 2/2] drm/i915: Add DSC support to MST path Date: Mon, 22 Aug 2022 12:40:37 +0300 Message-Id: <20220822094037.15483-3-stanislav.lisovskiy@intel.com> X-Mailer: git-send-email 2.24.1.485.gad05a3d8e5 In-Reply-To: <20220822094037.15483-1-stanislav.lisovskiy@intel.com> References: <20220822094037.15483-1-stanislav.lisovskiy@intel.com> MIME-Version: 1.0 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: , Cc: Stanislav.Lisovskiy@intel.com, jani.nikula@intel.com, manasi.d.navare@intel.com, jani.saarinen@intel.com, dri-devel@lists.freedesktop.org Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" 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: Removed intel_dp_mst_dsc_compute_config and refactored intel_dp_dsc_compute_config to support timeslots as a parameter(Ville Syrjälä) v3: - Rebased - Added a debug to see that we at least try reserving VCPI slots using DSC, because currently its not visible from the logs, thus making debugging more tricky. - Moved timeslots to numerator, where it should be. v4: - Call drm_dp_mst_atomic_check already during link config computation, because we need to know already by this moment if uncompressed amount of VCPI slots needed can fit, otherwise we need to use DSC. (thanks to Vinod Govindapillai for pointing this out) v5: - Put pipe_config->bigjoiner_pipes back to original condition in intel_dp_dsc_compute_config (don't remember when I lost it) Signed-off-by: Stanislav Lisovskiy --- drivers/gpu/drm/i915/display/intel_dp.c | 73 ++++----- drivers/gpu/drm/i915/display/intel_dp.h | 17 +++ drivers/gpu/drm/i915/display/intel_dp_mst.c | 157 ++++++++++++++++++++ 3 files changed, 205 insertions(+), 42 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index 32292c0be2bd..519b436fc530 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -116,7 +116,6 @@ 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) @@ -687,11 +686,12 @@ 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; @@ -702,8 +702,9 @@ static u16 intel_dp_dsc_get_output_bpp(struct drm_i915_private *i915, * for SST -> TimeSlotsPerMTP is 1, * for MST -> TimeSlotsPerMTP has to be calculated */ - bits_per_pixel = (link_clock * lane_count * 8) / + bits_per_pixel = (link_clock * lane_count * 8) * timeslots / intel_dp_mode_to_fec_clock(mode_clock); + drm_dbg_kms(&i915->drm, "Max link bpp: %u\n", bits_per_pixel); /* Small Joiner Check: output bpp <= joiner RAM (bits) / Horiz. width */ max_bpp_small_joiner_ram = small_joiner_ram_size_bits(i915) / @@ -752,9 +753,9 @@ 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; @@ -961,8 +962,8 @@ 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); @@ -1049,7 +1050,7 @@ 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, @@ -1354,7 +1355,7 @@ 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; @@ -1444,10 +1445,11 @@ 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); @@ -1498,7 +1500,8 @@ 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, @@ -1510,27 +1513,13 @@ 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 @@ -1538,13 +1527,13 @@ static int intel_dp_dsc_compute_config(struct intel_dp *intel_dp, */ if (adjusted_mode->crtc_clock > dev_priv->max_cdclk_freq || pipe_config->bigjoiner_pipes) { - if (pipe_config->dsc.slice_count < 2) { + 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); @@ -1633,7 +1622,7 @@ intel_dp_compute_link_config(struct intel_encoder *encoder, str_yes_no(ret), str_yes_no(joiner_needs_dsc), str_yes_no(intel_dp->force_dsc_en)); 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 a54902c713a3..c6539a6915e9 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.h +++ b/drivers/gpu/drm/i915/display/intel_dp.h @@ -56,6 +56,11 @@ 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); @@ -96,6 +101,18 @@ 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 14d2a64193b2..b4d68c324e68 100644 --- a/drivers/gpu/drm/i915/display/intel_dp_mst.c +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c @@ -99,6 +99,84 @@ 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) @@ -127,6 +205,7 @@ static int intel_dp_mst_compute_config(struct intel_encoder *encoder, struct drm_connector_state *conn_state) { struct drm_i915_private *dev_priv = to_i915(encoder->base.dev); + struct drm_atomic_state *state = pipe_config->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 = @@ -175,6 +254,38 @@ 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; + + /* + * We need to check if VCPI slots allocated can actually fit already + * here, to decide whether we use DSC or not. + * If either intel_dp_mst_compute_link_config or that one fails, + * then we try DSC as last resort. + */ + if (!ret) + ret = drm_dp_mst_atomic_check(state); + + /* 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. + */ + drm_dbg_kms(&dev_priv->drm, "Trying to find VCPI slots in DSC mode\n"); + + 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; @@ -713,6 +824,10 @@ 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; @@ -750,6 +865,48 @@ 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; }