From patchwork Mon Nov 28 07:15:42 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Nautiyal, Ankit K" X-Patchwork-Id: 13057086 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 456EDC433FE for ; Mon, 28 Nov 2022 07:16:12 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id D02D710E1D4; Mon, 28 Nov 2022 07:16:10 +0000 (UTC) Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) by gabe.freedesktop.org (Postfix) with ESMTPS id BFFB710E1C4 for ; Mon, 28 Nov 2022 07:15:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1669619709; x=1701155709; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=1W1DX83c39D5VfxNyYhgmg+Gl7LYl9grslZsEjLh3sE=; b=jue7aLhrjr5xSeyZmSDvXqZkEpKCl4btY8ERtiq/sPPy4AX/U9J2gZi0 CVpN3/qXlC7HYT/uJuwlFa04oLiMi6YrEdW/x9ewTcrxPC304SSR6x+4G 9in4EXHS8Cos2pAHF4FMM/fA0UgcdFYjBVHvde4RVPOGGwL8NSJij3cuS 1OPxUwlWvbPkQV879K0/CuGlJYir0Bl4DW4yK0B03DH1xtb3AVPh27g6u 1rQALznShhfkBmDhbwSXvP3T2gjp3rcruS+v7imSRzXJrakZoe5OaulIp x3Oi++K3rfwa2LuQ0OoArGpLcpK7Jmdk19xO4UIoud7arQWnBEnYla7or w==; X-IronPort-AV: E=McAfee;i="6500,9779,10544"; a="315919520" X-IronPort-AV: E=Sophos;i="5.96,199,1665471600"; d="scan'208";a="315919520" Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Nov 2022 23:15:09 -0800 X-IronPort-AV: E=McAfee;i="6500,9779,10544"; a="785518639" X-IronPort-AV: E=Sophos;i="5.96,199,1665471600"; d="scan'208";a="785518639" Received: from srr4-3-linux-103-aknautiy.iind.intel.com ([10.223.34.160]) by fmsmga001-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Nov 2022 23:15:07 -0800 From: Ankit Nautiyal To: intel-gfx@lists.freedesktop.org Date: Mon, 28 Nov 2022 12:45:42 +0530 Message-Id: <20221128071544.4115881-10-ankit.k.nautiyal@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221128071544.4115881-1-ankit.k.nautiyal@intel.com> References: <20221128071544.4115881-1-ankit.k.nautiyal@intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH v5 09/11] drm/i915/dp: Handle BPP where HDMI2.1 DFP doesn't support DSC X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" Currently we use the highest input BPC supported by DP sink while using DSC.In cases where PCON with HDMI2.1 as branch device, if PCON supports DSC but HDMI2.1 sink does not supports DSC, The PCON tries to use same input BPC that is used between Source and the PCON without DSC, which might not work even with the maximum FRL rate supported by HDMI2.1 sink. This patch calculates the max BPC that can be sufficient with either RGB or YCBCR420 format for the maximum FRL rate supported. v2: Rebase v3: Use the sink_format in the functions instead of ycbcr420 flag. Signed-off-by: Ankit Nautiyal --- drivers/gpu/drm/i915/display/intel_dp.c | 61 +++++++++++++++++++++++-- 1 file changed, 58 insertions(+), 3 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index c40d081358f8..d4de5c3da0ae 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -118,6 +118,7 @@ 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); +static bool intel_dp_is_hdmi_2_1_sink(struct intel_dp *intel_dp); /* Is link rate UHBR and thus 128b/132b? */ bool intel_dp_is_uhbr(const struct intel_crtc_state *crtc_state) @@ -1552,12 +1553,47 @@ static int intel_dp_dsc_compute_params(struct intel_encoder *encoder, return drm_dsc_compute_rc_parameters(vdsc_cfg); } +static int +intel_dp_pcon_hdmi21_get_bpp_nodsc(struct intel_dp *intel_dp, + struct intel_crtc_state *pipe_config, + int max_bpc) +{ + struct intel_connector *intel_connector = intel_dp->attached_connector; + struct drm_connector *connector = &intel_connector->base; + const struct drm_display_mode *adjusted_mode = &pipe_config->hw.adjusted_mode; + int i, num_bpc; + u8 dsc_bpc[3] = {0}; + int req_rate_gbps; + int max_frl_rate = connector->display_info.hdmi.max_lanes * + connector->display_info.hdmi.max_frl_rate_per_lane; + + num_bpc = drm_dp_dsc_sink_supported_input_bpcs(intel_dp->dsc_dpcd, + dsc_bpc); + for (i = 0; i < num_bpc; i++) { + if (dsc_bpc[i] > max_bpc) + continue; + + req_rate_gbps = DIV_ROUND_UP(dsc_bpc[i] * 3 * adjusted_mode->clock, 1000000); + + /* YCBCR420 reduces data rate by 2 */ + if (intel_crtc_has_420_sink_format(pipe_config)) + req_rate_gbps /= 2; + + if (req_rate_gbps < max_frl_rate) + return dsc_bpc[i] * 3; + } + + return 0; +} + 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) { struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp); + struct intel_connector *intel_connector = intel_dp->attached_connector; + struct drm_connector *connector = &intel_connector->base; struct drm_i915_private *dev_priv = to_i915(dig_port->base.base.dev); const struct drm_display_mode *adjusted_mode = &pipe_config->hw.adjusted_mode; @@ -1574,11 +1610,30 @@ static int intel_dp_dsc_compute_config(struct intel_dp *intel_dp, if (pipe_config->output_format == INTEL_OUTPUT_FORMAT_YCBCR420) return -EINVAL; - pipe_bpp = intel_dp_dsc_compute_bpp(intel_dp, conn_state->max_requested_bpc); - - if (intel_dp->force_dsc_bpc) { + /* + * In cases where PCON with HDMI2.1 as branch device, if PCON supports + * DSC but HDMI2.1 sink does not supports DSC, there can be issues due + * to the bpc used. + * With DSC, a source-PCON pair can support the mode with higher bpcs. + * But PCON->Sink pair, cannot support the same bpc without sink having + * DSC support. + * So use the max BPC as input BPC that will be sufficient to show the + * mode without DSC from PCON->HDMI2.1 + */ + if (intel_dp_is_hdmi_2_1_sink(intel_dp) && + !connector->display_info.hdmi.dsc_cap.v_1p2) { + pipe_bpp = intel_dp_pcon_hdmi21_get_bpp_nodsc(intel_dp, pipe_config, + conn_state->max_requested_bpc); + if (!pipe_bpp) { + drm_dbg_kms(&dev_priv->drm, + "No BPC possible to support the mode without HDMI2.1 DSC\n"); + return -EINVAL; + } + } else if (intel_dp->force_dsc_bpc) { pipe_bpp = intel_dp->force_dsc_bpc * 3; drm_dbg_kms(&dev_priv->drm, "Input DSC BPP forced to %d", pipe_bpp); + } else { + pipe_bpp = intel_dp_dsc_compute_bpp(intel_dp, conn_state->max_requested_bpc); } /* Min Input BPC for ICL+ is 8 */