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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4B705C43219 for ; Wed, 6 Apr 2022 01:06:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1839999AbiDFBGq (ORCPT ); Tue, 5 Apr 2022 21:06:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34190 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234314AbiDEKGd (ORCPT ); Tue, 5 Apr 2022 06:06:33 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A04405A586; Tue, 5 Apr 2022 02:55:07 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 30B016157A; Tue, 5 Apr 2022 09:55:07 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3C62EC385A1; Tue, 5 Apr 2022 09:55:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1649152506; bh=Pr4aKhIQBUBvr2CVTrgZDggDkLUzxmhsvq+8w46iZfc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=YZQYowiXcbm1NHD8Bvuks1nwg8thJHtrYPE5WCKzIos7Zah+xUax1cPq/zpOJrYfG LBK+8u6GHhj2rAmReRvqLcNzSwhbSD2xpOKXTEvc540npb1rPsfdzBAc2CgSZsnqBp usxzjYi+nZc0DmFfAZRgJzJet66wNYYPjA1MPlkM= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= , Stanislav Lisovskiy , Tvrtko Ursulin Subject: [PATCH 5.15 784/913] drm/i915: Treat SAGV block time 0 as SAGV disabled Date: Tue, 5 Apr 2022 09:30:46 +0200 Message-Id: <20220405070403.335304555@linuxfoundation.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220405070339.801210740@linuxfoundation.org> References: <20220405070339.801210740@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Ville Syrjälä commit 1937f3feb0e84089ae4065e09c871b8ab4676f01 upstream. For modern platforms the spec explicitly states that a SAGV block time of zero means that SAGV is not supported. Let's extend that to all platforms. Supposedly there should be no systems where this isn't true, and it'll allow us to: - use the same code regardless of older vs. newer platform - wm latencies already treat 0 as disabled, so this fits well with other related code - make it a bit more clear when SAGV is used vs. not - avoid overflows from adding U32_MAX with a u16 wm0 latency value which could cause us to miscalculate the SAGV watermarks on tgl+ Cc: stable@vger.kernel.org Signed-off-by: Ville Syrjälä Link: https://patchwork.freedesktop.org/patch/msgid/20220309164948.10671-2-ville.syrjala@linux.intel.com Reviewed-by: Stanislav Lisovskiy (cherry picked from commit d8f5855b31c0523ea3b171db8dfb998830e8735d) Signed-off-by: Tvrtko Ursulin Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/i915/intel_pm.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) --- a/drivers/gpu/drm/i915/intel_pm.c +++ b/drivers/gpu/drm/i915/intel_pm.c @@ -3713,8 +3713,7 @@ skl_setup_sagv_block_time(struct drm_i91 MISSING_CASE(DISPLAY_VER(dev_priv)); } - /* Default to an unusable block time */ - dev_priv->sagv_block_time_us = -1; + dev_priv->sagv_block_time_us = 0; } /* @@ -5635,7 +5634,7 @@ static void skl_compute_plane_wm(const s result->min_ddb_alloc = max(min_ddb_alloc, blocks) + 1; result->enable = true; - if (DISPLAY_VER(dev_priv) < 12) + if (DISPLAY_VER(dev_priv) < 12 && dev_priv->sagv_block_time_us) result->can_sagv = latency >= dev_priv->sagv_block_time_us; } @@ -5666,7 +5665,10 @@ static void tgl_compute_sagv_wm(const st struct drm_i915_private *dev_priv = to_i915(crtc_state->uapi.crtc->dev); struct skl_wm_level *sagv_wm = &plane_wm->sagv.wm0; struct skl_wm_level *levels = plane_wm->wm; - unsigned int latency = dev_priv->wm.skl_latency[0] + dev_priv->sagv_block_time_us; + unsigned int latency = 0; + + if (dev_priv->sagv_block_time_us) + latency = dev_priv->sagv_block_time_us + dev_priv->wm.skl_latency[0]; skl_compute_plane_wm(crtc_state, 0, latency, wm_params, &levels[0],