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 X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id ECCCCC433E7 for ; Thu, 15 Oct 2020 23:15:30 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 98BF620797 for ; Thu, 15 Oct 2020 23:15:30 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 98BF620797 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=intel-gfx-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 1EC0C6E3F2; Thu, 15 Oct 2020 23:15:30 +0000 (UTC) Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by gabe.freedesktop.org (Postfix) with ESMTPS id 0D5036E3F2 for ; Thu, 15 Oct 2020 23:15:28 +0000 (UTC) IronPort-SDR: SaqBLAzlnbdchAJBsLkM1bKt151poDrRnLpJULirs06V+KOEtEesOaluIslMdKvJNgEE5TSYZN j8FeH2dpfIAw== X-IronPort-AV: E=McAfee;i="6000,8403,9775"; a="163010332" X-IronPort-AV: E=Sophos;i="5.77,380,1596524400"; d="scan'208";a="163010332" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Oct 2020 16:15:27 -0700 IronPort-SDR: HhzD6G55qi6/c5jaGBoHxM4jfHOkxscRMo3B5DUq3wkumoZwqfZJXCCJOecWLegDgpbJlsmc6u 72oXffYdKtfg== X-IronPort-AV: E=Sophos;i="5.77,380,1596524400"; d="scan'208";a="531450522" Received: from linux-desktop.iind.intel.com ([10.223.34.173]) by orsmga005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Oct 2020 16:15:26 -0700 From: Uma Shankar To: intel-gfx@lists.freedesktop.org Date: Fri, 16 Oct 2020 05:19:02 +0530 Message-Id: <20201015234902.7134-13-uma.shankar@intel.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201015234902.7134-1-uma.shankar@intel.com> References: <20201015234902.7134-1-uma.shankar@intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [v8 12/12] drm/i915/display: [NOT FOR MERGE] Reduce blanking to support 4k60@10bpp for LSPCON 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" Blanking needs to be reduced to incorporate DP and HDMI timing/link bandwidth limitations for CEA modes (4k@60 at 10 bpp). DP can drive 17.28Gbs while 4k modes (VIC97 etc) at 10 bpp required 17.8 Gbps. This will cause mode to blank out. Reduced Htotal by shortening the back porch and front porch within permissible limits. Note: This is for reference for userspace, not to be merged in kernel. v2: This is marked as Not for merge and the responsibilty to program these custom timings will be on userspace. This patch is just for reference purposes. This is based on Ville's recommendation. v3: updated commit message. Signed-off-by: Uma Shankar --- drivers/gpu/drm/i915/display/intel_dp.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index 1eea514c62b3..fc9522b224aa 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -708,8 +708,10 @@ intel_dp_mode_valid(struct drm_connector *connector, { struct intel_dp *intel_dp = intel_attached_dp(to_intel_connector(connector)); struct intel_connector *intel_connector = to_intel_connector(connector); + struct intel_encoder *intel_encoder = intel_attached_encoder(intel_connector); struct drm_display_mode *fixed_mode = intel_connector->panel.fixed_mode; struct drm_i915_private *dev_priv = to_i915(connector->dev); + struct intel_lspcon *lspcon = enc_to_intel_lspcon(intel_encoder); int target_clock = mode->clock; int max_rate, mode_rate, max_lanes, max_link_clock; int max_dotclk = dev_priv->max_dotclk_freq; @@ -730,6 +732,21 @@ intel_dp_mode_valid(struct drm_connector *connector, target_clock = fixed_mode->clock; } + /* + * Reducing Blanking to incorporate DP and HDMI timing/link bandwidth + * limitations for CEA modes (4k@60 at 10 bpp). DP can drive 17.28Gbs + * while 4k modes (VIC97 etc) at 10 bpp required 17.8 Gbps. This will + * cause mode to blank out. Reduced Htotal by shortening the back porch + * and front porch within permissible limits. + */ + if (lspcon->active && lspcon->hdr_supported && + mode->clock > 570000) { + mode->clock = 570000; + mode->htotal -= 180; + mode->hsync_start -= 72; + mode->hsync_end -= 72; + } + max_link_clock = intel_dp_max_link_rate(intel_dp); max_lanes = intel_dp_max_lane_count(intel_dp); -- 2.26.2 _______________________________________________ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx