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 23D32D49C7A for ; Fri, 30 Jan 2026 08:34:42 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id BB2A110E949; Fri, 30 Jan 2026 08:34:41 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=intel.com header.i=@intel.com header.b="ExfoDtUm"; dkim-atps=neutral Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.15]) by gabe.freedesktop.org (Postfix) with ESMTPS id E6C4410E92F; Fri, 30 Jan 2026 08:34:38 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1769762079; x=1801298079; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=Z1GJVSP5Nm3M9+vb4DtZPlxW/70yWANl+YKY0ZBVpbE=; b=ExfoDtUmo3ZugJg8b7KEImcLhb+9tdNeNbfifqMjT1odzodM1a1/b5Pp bA8TnC12f6IEGhal+bvWZQ2atHoub/gJAiu7rcyZ6NB/7r7WL9wh2/66H o70eysnHb5pvTtUKN490LqrDDR5v+iFSn+jGUD3OfzSnDvkbaMlbAN3G5 sfEWAUhCKOqG5JoVlg07JDGa4f/ncOuKzFf09+NNUbGvxI5oE6PJS78E7 V9r3j4Ju5MvH21d1KLvLPs4gKebIn0GqmFpekSII06E+MuI0TkFUAdC98 1k0m6C2vc8SRbwYeLaR6StE7m+RVdyu3GHNsEKFfMnVQysBqQhww2DGUL w==; X-CSE-ConnectionGUID: LXftjAloR9iMfTBbQK4npw== X-CSE-MsgGUID: ikkKkOKoTim+Oe7Cvo7Aiw== X-IronPort-AV: E=McAfee;i="6800,10657,11686"; a="74636687" X-IronPort-AV: E=Sophos;i="6.21,262,1763452800"; d="scan'208";a="74636687" Received: from orviesa007.jf.intel.com ([10.64.159.147]) by orvoesa107.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Jan 2026 00:34:39 -0800 X-CSE-ConnectionGUID: 2uvBE00xQ7aof9M3UEryzg== X-CSE-MsgGUID: jOyS9alATKSSMyQNYxq9xQ== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.21,262,1763452800"; d="scan'208";a="208910120" Received: from srr4-3-linux-103-aknautiy.iind.intel.com ([10.223.34.160]) by orviesa007-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 30 Jan 2026 00:34:22 -0800 From: Ankit Nautiyal To: intel-gfx@lists.freedesktop.org, intel-xe@lists.freedesktop.org Cc: jani.nikula@linux.intel.com, imre.deak@intel.com, Ankit Nautiyal Subject: [PATCH 12/17] drm/i915/dp: Introduce helper to check pixel rate against dotclock limits Date: Fri, 30 Jan 2026 13:48:07 +0530 Message-ID: <20260130081812.32087-13-ankit.k.nautiyal@intel.com> X-Mailer: git-send-email 2.45.2 In-Reply-To: <20260130081812.32087-1-ankit.k.nautiyal@intel.com> References: <20260130081812.32087-1-ankit.k.nautiyal@intel.com> MIME-Version: 1.0 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" Add intel_dp_dotclk_valid() helper, that checks the required pixel rate against platform dotclock limit. With joined pipes the effective dotclock limit depends upon the number of joined pipes. Call the helper from the mode_valid phase and from the compute_config phase where we need to check the limits for the given target clock for a given joiner candidate. v2: Rename the helper to intel_dp_dotclk_valid(). (Imre) Signed-off-by: Ankit Nautiyal Reviewed-by: Imre Deak --- drivers/gpu/drm/i915/display/intel_dp.c | 31 +++++++++++++++------ drivers/gpu/drm/i915/display/intel_dp.h | 3 ++ drivers/gpu/drm/i915/display/intel_dp_mst.c | 19 +++++++------ 3 files changed, 35 insertions(+), 18 deletions(-) diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c index c5e2e29a751b..bf90605ec9cb 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.c +++ b/drivers/gpu/drm/i915/display/intel_dp.c @@ -1412,6 +1412,18 @@ bool intel_dp_can_join(struct intel_display *display, } } +bool intel_dp_dotclk_valid(struct intel_display *display, + int target_clock, + int num_joined_pipes) +{ + int max_dotclk = display->cdclk.max_dotclk_freq; + int effective_dotclk_limit; + + effective_dotclk_limit = max_dotclk * num_joined_pipes; + + return target_clock <= effective_dotclk_limit; +} + static enum drm_mode_status intel_dp_mode_valid(struct drm_connector *_connector, const struct drm_display_mode *mode) @@ -1474,8 +1486,6 @@ intel_dp_mode_valid(struct drm_connector *_connector, */ status = MODE_CLOCK_HIGH; for (num_joined_pipes = 1; num_joined_pipes <= I915_MAX_PIPES; num_joined_pipes++) { - int max_dotclk = display->cdclk.max_dotclk_freq; - if (connector->force_joined_pipes && num_joined_pipes != connector->force_joined_pipes) continue; @@ -1539,9 +1549,9 @@ intel_dp_mode_valid(struct drm_connector *_connector, if (status != MODE_OK) continue; - max_dotclk *= num_joined_pipes; - - if (target_clock > max_dotclk) { + if (!intel_dp_dotclk_valid(display, + target_clock, + num_joined_pipes)) { status = MODE_CLOCK_HIGH; continue; } @@ -2772,12 +2782,10 @@ intel_dp_compute_link_for_joined_pipes(struct intel_encoder *encoder, const struct drm_display_mode *adjusted_mode = &pipe_config->hw.adjusted_mode; struct intel_dp *intel_dp = enc_to_intel_dp(encoder); - int max_dotclk = display->cdclk.max_dotclk_freq; struct link_config_limits limits; bool dsc_needed, joiner_needs_dsc; int ret = 0; - max_dotclk *= num_joined_pipes; joiner_needs_dsc = intel_dp_joiner_needs_dsc(display, num_joined_pipes); dsc_needed = joiner_needs_dsc || intel_dp->force_dsc_en || @@ -2801,7 +2809,10 @@ intel_dp_compute_link_for_joined_pipes(struct intel_encoder *encoder, fxp_q4_from_int(pipe_config->pipe_bpp), 0, false); - if (ret || adjusted_mode->crtc_clock > max_dotclk) + if (ret || + !intel_dp_dotclk_valid(display, + adjusted_mode->crtc_clock, + num_joined_pipes)) dsc_needed = true; } @@ -2827,7 +2838,9 @@ intel_dp_compute_link_for_joined_pipes(struct intel_encoder *encoder, if (ret < 0) return ret; - if (adjusted_mode->crtc_clock > max_dotclk) + if (!intel_dp_dotclk_valid(display, + adjusted_mode->crtc_clock, + num_joined_pipes)) return -EINVAL; } diff --git a/drivers/gpu/drm/i915/display/intel_dp.h b/drivers/gpu/drm/i915/display/intel_dp.h index ebaa35d23c9c..edeb09372d1e 100644 --- a/drivers/gpu/drm/i915/display/intel_dp.h +++ b/drivers/gpu/drm/i915/display/intel_dp.h @@ -224,5 +224,8 @@ int intel_dp_sdp_min_guardband(const struct intel_crtc_state *crtc_state, int intel_dp_max_hdisplay_per_pipe(struct intel_display *display); bool intel_dp_can_join(struct intel_display *display, int num_joined_pipes); +bool intel_dp_dotclk_valid(struct intel_display *display, + int target_clock, + int num_joined_pipes); #endif /* __INTEL_DP_H__ */ diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c index dac89dc54f1d..0eab5ced27d3 100644 --- a/drivers/gpu/drm/i915/display/intel_dp_mst.c +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c @@ -606,12 +606,10 @@ static int mst_stream_compute_link_for_joined_pipes(struct intel_encoder *encode &pipe_config->hw.adjusted_mode; struct intel_connector *connector = to_intel_connector(conn_state->connector); - int max_dotclk = display->cdclk.max_dotclk_freq; struct link_config_limits limits; bool dsc_needed, joiner_needs_dsc; int ret = 0; - max_dotclk *= num_joined_pipes; joiner_needs_dsc = intel_dp_joiner_needs_dsc(display, num_joined_pipes); dsc_needed = joiner_needs_dsc || intel_dp->force_dsc_en || @@ -625,7 +623,10 @@ static int mst_stream_compute_link_for_joined_pipes(struct intel_encoder *encode if (ret == -EDEADLK) return ret; - if (ret || adjusted_mode->clock > max_dotclk) + if (ret || + !intel_dp_dotclk_valid(display, + adjusted_mode->clock, + num_joined_pipes)) dsc_needed = true; } @@ -669,7 +670,9 @@ static int mst_stream_compute_link_for_joined_pipes(struct intel_encoder *encode if (ret) return ret; - if (adjusted_mode->clock > max_dotclk) + if (!intel_dp_dotclk_valid(display, + adjusted_mode->clock, + num_joined_pipes)) return -EINVAL; } @@ -1525,8 +1528,6 @@ mst_connector_mode_valid_ctx(struct drm_connector *_connector, *status = MODE_CLOCK_HIGH; for (num_joined_pipes = 1; num_joined_pipes <= I915_MAX_PIPES; num_joined_pipes++) { - int max_dotclk = display->cdclk.max_dotclk_freq; - if (connector->force_joined_pipes && num_joined_pipes != connector->force_joined_pipes) continue; @@ -1567,9 +1568,9 @@ mst_connector_mode_valid_ctx(struct drm_connector *_connector, if (*status != MODE_OK) continue; - max_dotclk *= num_joined_pipes; - - if (mode->clock > max_dotclk) { + if (!intel_dp_dotclk_valid(display, + mode->clock, + num_joined_pipes)) { *status = MODE_CLOCK_HIGH; continue; } -- 2.45.2