From patchwork Tue Jan 23 10:28:39 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Imre Deak X-Patchwork-Id: 13527181 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 F2E73C47DDB for ; Tue, 23 Jan 2024 10:29:27 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 8242810F0BD; Tue, 23 Jan 2024 10:28:55 +0000 (UTC) Received: from mgamail.intel.com (mgamail.intel.com [192.55.52.115]) by gabe.freedesktop.org (Postfix) with ESMTPS id EC8AF10EDBB; Tue, 23 Jan 2024 10:28:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1706005727; x=1737541727; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=hVsTSJ1Z3VBG2JYY1RibLV4xyDF4tAtc+6xMPDfUUwY=; b=D0Y8R7MQWOPzXFZQeUvZPowYY5ZqYwXbNfWsGSbZOcTd0vgs1QZO7U7D ANIwjDNhs2bQfLYYtQKWKaFvfQZpGSDTqN0mwpfFQngmcrN4fSnJAOfHI iFsYY1CmhpHIj6ptsqRG6cy9sK3bkv4VfDzCMBvJp2muMrV46TJEvH2ML 1dZIsX+0tzTgHSosWvLE6q4a2sFMzXjer9R61Yovs4O0NOORhxfyzdzz+ yCdpRGb3jgnxJKnTLOi86vrDdaHnvVsjVXK/2Mu0ZaQDJOA8C6KA52vzc 0elHZsJyEHwhWettwwG8+uYwoaQNNpm4jIg4iioQQ2nQpLM3opYdJnkgC A==; X-IronPort-AV: E=McAfee;i="6600,9927,10961"; a="401134162" X-IronPort-AV: E=Sophos;i="6.05,214,1701158400"; d="scan'208";a="401134162" Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Jan 2024 02:28:47 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10961"; a="856283391" X-IronPort-AV: E=Sophos;i="6.05,214,1701158400"; d="scan'208";a="856283391" Received: from ideak-desk.fi.intel.com ([10.237.72.78]) by fmsmga004-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 23 Jan 2024 02:28:46 -0800 From: Imre Deak To: intel-gfx@lists.freedesktop.org Subject: [PATCH 08/19] drm/i915/dp: Factor out intel_dp_read_dprx_caps() Date: Tue, 23 Jan 2024 12:28:39 +0200 Message-Id: <20240123102850.390126-9-imre.deak@intel.com> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240123102850.390126-1-imre.deak@intel.com> References: <20240123102850.390126-1-imre.deak@intel.com> MIME-Version: 1.0 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: , Cc: dri-devel@lists.freedesktop.org Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" Factor out a function to read the sink's DPRX capabilities used by a follow-up patch enabling the DP tunnel BW allocation mode. Signed-off-by: Imre Deak Reviewed-by: Uma Shankar --- .../drm/i915/display/intel_dp_link_training.c | 30 +++++++++++++++---- .../drm/i915/display/intel_dp_link_training.h | 1 + 2 files changed, 26 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_dp_link_training.c b/drivers/gpu/drm/i915/display/intel_dp_link_training.c index 7b140cbf8dd31..fb84ca98bb7ab 100644 --- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c +++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c @@ -162,6 +162,28 @@ static int intel_dp_init_lttpr(struct intel_dp *intel_dp, const u8 dpcd[DP_RECEI return lttpr_count; } +int intel_dp_read_dprx_caps(struct intel_dp *intel_dp, u8 dpcd[DP_RECEIVER_CAP_SIZE]) +{ + struct drm_i915_private *i915 = dp_to_i915(intel_dp); + + if (intel_dp_is_edp(intel_dp)) + return 0; + + /* + * Detecting LTTPRs must be avoided on platforms with an AUX timeout + * period < 3.2ms. (see DP Standard v2.0, 2.11.2, 3.6.6.1). + */ + if (DISPLAY_VER(i915) >= 10 && !IS_GEMINILAKE(i915)) + if (drm_dp_dpcd_probe(&intel_dp->aux, + DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV)) + return -EIO; + + if (drm_dp_read_dpcd_caps(&intel_dp->aux, dpcd)) + return -EIO; + + return 0; +} + /** * intel_dp_init_lttpr_and_dprx_caps - detect LTTPR and DPRX caps, init the LTTPR link training mode * @intel_dp: Intel DP struct @@ -192,12 +214,10 @@ int intel_dp_init_lttpr_and_dprx_caps(struct intel_dp *intel_dp) if (!intel_dp_is_edp(intel_dp) && (DISPLAY_VER(i915) >= 10 && !IS_GEMINILAKE(i915))) { u8 dpcd[DP_RECEIVER_CAP_SIZE]; + int err = intel_dp_read_dprx_caps(intel_dp, dpcd); - if (drm_dp_dpcd_probe(&intel_dp->aux, DP_LT_TUNABLE_PHY_REPEATER_FIELD_DATA_STRUCTURE_REV)) - return -EIO; - - if (drm_dp_read_dpcd_caps(&intel_dp->aux, dpcd)) - return -EIO; + if (err != 0) + return err; lttpr_count = intel_dp_init_lttpr(intel_dp, dpcd); } diff --git a/drivers/gpu/drm/i915/display/intel_dp_link_training.h b/drivers/gpu/drm/i915/display/intel_dp_link_training.h index 2c8f2775891b0..19836a8a4f904 100644 --- a/drivers/gpu/drm/i915/display/intel_dp_link_training.h +++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.h @@ -11,6 +11,7 @@ struct intel_crtc_state; struct intel_dp; +int intel_dp_read_dprx_caps(struct intel_dp *intel_dp, u8 dpcd[DP_RECEIVER_CAP_SIZE]); int intel_dp_init_lttpr_and_dprx_caps(struct intel_dp *intel_dp); void intel_dp_get_adjust_train(struct intel_dp *intel_dp,