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=-16.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 C036EC56202 for ; Thu, 26 Nov 2020 07:41:48 +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 6740F206C0 for ; Thu, 26 Nov 2020 07:41:46 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6740F206C0 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 D7AE26E82F; Thu, 26 Nov 2020 07:41:45 +0000 (UTC) Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by gabe.freedesktop.org (Postfix) with ESMTPS id 934BD6E81B for ; Thu, 26 Nov 2020 07:41:37 +0000 (UTC) IronPort-SDR: 6fNoEXqsIqHeTsI0c/3nyDFx9ejqbjMT3fmAFneG9w5bZpWhLC1waIsIA5BLAc9PXfnV7ia4iv 0Agy89BPRLMw== X-IronPort-AV: E=McAfee;i="6000,8403,9816"; a="168741392" X-IronPort-AV: E=Sophos;i="5.78,371,1599548400"; d="scan'208";a="168741392" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga008.jf.intel.com ([10.7.209.65]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Nov 2020 23:41:37 -0800 IronPort-SDR: e1U6OGjT2paMxevoFAsHKjciwALHNymDDj1idt0Vsdq7ITrUsaiT4UneaDw5bWhKByKYkxYT4V JBqJg2lcoVdg== X-IronPort-AV: E=Sophos;i="5.78,371,1599548400"; d="scan'208";a="359448155" Received: from linux-desktop.iind.intel.com ([10.223.34.173]) by orsmga008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 25 Nov 2020 23:41:35 -0800 From: Uma Shankar To: intel-gfx@lists.freedesktop.org Date: Thu, 26 Nov 2020 13:44:45 +0530 Message-Id: <20201126081445.29759-14-uma.shankar@intel.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20201126081445.29759-1-uma.shankar@intel.com> References: <20201126081445.29759-1-uma.shankar@intel.com> MIME-Version: 1.0 Subject: [Intel-gfx] [v11 13/13] 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 c4bbebc8c23d..edd9263d173c 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -741,8 +741,10 @@ 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; @@ -778,6 +780,21 @@ intel_dp_mode_valid(struct drm_connector *connector, if (target_clock > max_dotclk) return MODE_CLOCK_HIGH; + /* + * 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