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 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 C97EBCCD184 for ; Tue, 14 Oct 2025 04:29:53 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 8DF5610E1C9; Tue, 14 Oct 2025 04:29:53 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="OR9JLP9f"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [192.198.163.7]) by gabe.freedesktop.org (Postfix) with ESMTPS id 5178D10E535; Tue, 14 Oct 2025 04:29:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1760416188; x=1791952188; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=715oGfJB38+wK0yJcyc3/aceR5UJgDLH7/W4Ow0Et5k=; b=OR9JLP9fAK9d/LphRMjB32i5uSiq5TajS5frRkNFyABJnXdJSA9eYMnK 6+d9CYZqS84J2SnaFf21TaLaKWdC7JMkCgp3Ofa3St6wpsz5wkaUBrJkz rKb/y9hag4zJUOVkfZiNKuNjB981O3myvBJi25ibv89QD4yJHGUj+CB80 c6YRchpVQ1yIXx7SFeGg0M4mm7NHPpq7Waki8VKs0dz+czdhbCN6GzePr bvgdsFKJ9mpqte+T5iebGtW32f1BWo83r3vfk1Lc8hTjIae6Z+YQcnqsS wImq9wW6q8kmbA1pyJAErxwo5htH3lZuQX4WThLFA9w7P2YLoIbhXVJnS A==; X-CSE-ConnectionGUID: 3J3Ks9x9TiKHN4YXPBZG6w== X-CSE-MsgGUID: f0jMuLINS6yAAPh8yCqdIg== X-IronPort-AV: E=McAfee;i="6800,10657,11581"; a="88029785" X-IronPort-AV: E=Sophos;i="6.19,227,1754982000"; d="scan'208";a="88029785" Received: from orviesa002.jf.intel.com ([10.64.159.142]) by fmvoesa101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Oct 2025 21:29:48 -0700 X-CSE-ConnectionGUID: iPhiePqqRmuSeuxMEOnnhA== X-CSE-MsgGUID: AZWhvj0MSqO3rKOoI4Bgog== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.19,227,1754982000"; d="scan'208";a="212399828" Received: from srr4-3-linux-103-aknautiy.iind.intel.com ([10.223.34.160]) by orviesa002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Oct 2025 21:29:46 -0700 From: Ankit Nautiyal To: intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org Cc: ville.syrjala@linux.intel.com, jouni.hogander@intel.com, animesh.manna@intel.com, Ankit Nautiyal Subject: [PATCH 4/8] drm/i915/vblank: Add helper to get correct vblank length Date: Tue, 14 Oct 2025 09:46:24 +0530 Message-ID: <20251014041628.1291117-5-ankit.k.nautiyal@intel.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20251014041628.1291117-1-ankit.k.nautiyal@intel.com> References: <20251014041628.1291117-1-ankit.k.nautiyal@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: intel-xe@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel Xe graphics driver List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-xe-bounces@lists.freedesktop.org Sender: "Intel-xe" Currently crtc_vblank_start is assumed to be the vblank_start for the fixed refresh rate case. That value can be different from the variable refresh rate case whenever always_use_vrr_tg()==false. On icl/tgl it's always different due to the extra vblank delay, and also on adl+ it could be different if we were to use an optimized guardband. So places where crtc_vblank_start is used to compute vblank length needs change so as to account for cases where vrr is enabled. Specifically with vrr.enable the effective vblank length is actually guardband. Add a helper to get the correct vblank length for both vrr and fixed refresh rate cases. Use this helper where vblank_start is used to compute the vblank length. Signed-off-by: Ankit Nautiyal Reviewed-by: Ville Syrjälä --- drivers/gpu/drm/i915/display/intel_vblank.c | 10 ++++++++++ drivers/gpu/drm/i915/display/intel_vblank.h | 2 ++ drivers/gpu/drm/i915/display/skl_watermark.c | 3 ++- 3 files changed, 14 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/i915/display/intel_vblank.c b/drivers/gpu/drm/i915/display/intel_vblank.c index 0b7fcc05e64c..2fc0c1c0bb87 100644 --- a/drivers/gpu/drm/i915/display/intel_vblank.c +++ b/drivers/gpu/drm/i915/display/intel_vblank.c @@ -767,3 +767,13 @@ int intel_vblank_evade(struct intel_vblank_evade_ctx *evade) return scanline; } + +int intel_crtc_vblank_length(const struct intel_crtc_state *crtc_state) +{ + const struct drm_display_mode *adjusted_mode = &crtc_state->hw.adjusted_mode; + + if (crtc_state->vrr.enable) + return crtc_state->vrr.guardband; + else + return adjusted_mode->crtc_vtotal - adjusted_mode->crtc_vblank_start; +} diff --git a/drivers/gpu/drm/i915/display/intel_vblank.h b/drivers/gpu/drm/i915/display/intel_vblank.h index 21fbb08d61d5..98d04cacd65f 100644 --- a/drivers/gpu/drm/i915/display/intel_vblank.h +++ b/drivers/gpu/drm/i915/display/intel_vblank.h @@ -48,4 +48,6 @@ const struct intel_crtc_state * intel_pre_commit_crtc_state(struct intel_atomic_state *state, struct intel_crtc *crtc); +int intel_crtc_vblank_length(const struct intel_crtc_state *crtc_state); + #endif /* __INTEL_VBLANK_H__ */ diff --git a/drivers/gpu/drm/i915/display/skl_watermark.c b/drivers/gpu/drm/i915/display/skl_watermark.c index 9df9ee137bf9..06e5e6c77d2e 100644 --- a/drivers/gpu/drm/i915/display/skl_watermark.c +++ b/drivers/gpu/drm/i915/display/skl_watermark.c @@ -28,6 +28,7 @@ #include "intel_flipq.h" #include "intel_pcode.h" #include "intel_plane.h" +#include "intel_vblank.h" #include "intel_wm.h" #include "skl_universal_plane_regs.h" #include "skl_watermark.h" @@ -2241,7 +2242,7 @@ skl_is_vblank_too_short(const struct intel_crtc_state *crtc_state, scaler_prefill_latency(crtc_state) + dsc_prefill_latency(crtc_state) + wm0_lines > - adjusted_mode->crtc_vtotal - adjusted_mode->crtc_vblank_start; + intel_crtc_vblank_length(crtc_state); } static int skl_max_wm0_lines(const struct intel_crtc_state *crtc_state) -- 2.45.2