From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 397F041EE14; Sat, 28 Feb 2026 17:45:55 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772300755; cv=none; b=Dj1xjmnTfX5QxV9gqnSoWC/2D/3ABbj8HdLfi5S6KTu8nttXubu6HsNdXUjVFwU1mRNfjdc8B2r8dTGWgU4pTt2AAJBokNWRkrw4usJJ4ep+5yDym53w7pWrFfttgxrMqK3+GrEx3/QlU+m4ihjMO6Y45xFX6BDPTZdkP1iERUo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772300755; c=relaxed/simple; bh=0fLR1J4FMSOIvTYpF/twl2H6aYPkBt+W2GMacOSwAUw=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=L5Wz0VSCLxv0s/ZZJWly3AF3CztZhNpqS9KBzeexeG7PXMvKijOYPu31bOuCi7D3gdtPBixfIPtBGOR9g5Of97epzO7gJz/7fS8RUBP+AMFzbah6Lu+a08R/NcGJH3sVTjzPSuN4TefJf82eqPREeAHpV4B6EdYOwgd7gl71WQk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Bm0gcvDX; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Bm0gcvDX" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3135AC19425; Sat, 28 Feb 2026 17:45:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772300755; bh=0fLR1J4FMSOIvTYpF/twl2H6aYPkBt+W2GMacOSwAUw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Bm0gcvDXiAi9LoOTpa02kg7cHiOf/aTdvqci+A19hHaa79+M/RWQQWOWiDFNZjYUT mnTSMJSByrYahZoLal6nIy6ZM23WHm5YonUf6ipkeblZmjObRwmqVsF60V3UNAv6WZ 1bVnbupSiiSbAT8OSS9R4RbRDjejcFAjVw9HaYZscfqM1YvhRDh3VmxpZJiNNQDX+L JRcLdsCMd/EJgRSzIqwC+fPhFu6BXmVf9bNUw50mL1B9D4qeHtSPMpKg9RvCtdQ+zi LgGbs5oG+k1sPk3mmGAYeNXyqwKgjzJQO1Q1q3KAP1IX8VPyTks5NQpwKB63bMxEi5 m/mbLP2aV5ykw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Leo Li , Nicholas Kazlauskas , Tom Chung , Daniel Wheeler , Alex Deucher , Sasha Levin Subject: [PATCH 6.19 791/844] drm/amd/display: Increase DCN35 SR enter/exit latency Date: Sat, 28 Feb 2026 12:31:44 -0500 Message-ID: <20260228173244.1509663-792-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260228173244.1509663-1-sashal@kernel.org> References: <20260228173244.1509663-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit From: Leo Li [ Upstream commit 318917e1d8ecc89f820f4fabf79935f4fed718cd ] [Why & How] On Framework laptops with DDR5 modules, underflow can be observed. It's unclear why it only occurs on specific desktop contents. However, increasing enter/exit latencies by 3us seems to resolve it. Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/4463 Reviewed-by: Nicholas Kazlauskas Signed-off-by: Leo Li Signed-off-by: Tom Chung Tested-by: Daniel Wheeler Signed-off-by: Alex Deucher Cc: stable@vger.kernel.org Signed-off-by: Sasha Levin --- .../amd/display/dc/clk_mgr/dcn35/dcn35_clk_mgr.c | 16 ++++++++-------- .../gpu/drm/amd/display/dc/dml/dcn35/dcn35_fpu.c | 4 ++-- 2 files changed, 10 insertions(+), 10 deletions(-) diff --git a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn35_clk_mgr.c b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn35_clk_mgr.c index dfd0c9505af09..0a21910c87e10 100644 --- a/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn35_clk_mgr.c +++ b/drivers/gpu/drm/amd/display/dc/clk_mgr/dcn35/dcn35_clk_mgr.c @@ -768,32 +768,32 @@ static struct wm_table ddr5_wm_table = { .wm_inst = WM_A, .wm_type = WM_TYPE_PSTATE_CHG, .pstate_latency_us = 11.72, - .sr_exit_time_us = 28.0, - .sr_enter_plus_exit_time_us = 30.0, + .sr_exit_time_us = 31.0, + .sr_enter_plus_exit_time_us = 33.0, .valid = true, }, { .wm_inst = WM_B, .wm_type = WM_TYPE_PSTATE_CHG, .pstate_latency_us = 11.72, - .sr_exit_time_us = 28.0, - .sr_enter_plus_exit_time_us = 30.0, + .sr_exit_time_us = 31.0, + .sr_enter_plus_exit_time_us = 33.0, .valid = true, }, { .wm_inst = WM_C, .wm_type = WM_TYPE_PSTATE_CHG, .pstate_latency_us = 11.72, - .sr_exit_time_us = 28.0, - .sr_enter_plus_exit_time_us = 30.0, + .sr_exit_time_us = 31.0, + .sr_enter_plus_exit_time_us = 33.0, .valid = true, }, { .wm_inst = WM_D, .wm_type = WM_TYPE_PSTATE_CHG, .pstate_latency_us = 11.72, - .sr_exit_time_us = 28.0, - .sr_enter_plus_exit_time_us = 30.0, + .sr_exit_time_us = 31.0, + .sr_enter_plus_exit_time_us = 33.0, .valid = true, }, } diff --git a/drivers/gpu/drm/amd/display/dc/dml/dcn35/dcn35_fpu.c b/drivers/gpu/drm/amd/display/dc/dml/dcn35/dcn35_fpu.c index 817a370e80a77..8a177d5ae213e 100644 --- a/drivers/gpu/drm/amd/display/dc/dml/dcn35/dcn35_fpu.c +++ b/drivers/gpu/drm/amd/display/dc/dml/dcn35/dcn35_fpu.c @@ -164,8 +164,8 @@ struct _vcs_dpi_soc_bounding_box_st dcn3_5_soc = { }, }, .num_states = 5, - .sr_exit_time_us = 28.0, - .sr_enter_plus_exit_time_us = 30.0, + .sr_exit_time_us = 31.0, + .sr_enter_plus_exit_time_us = 33.0, .sr_exit_z8_time_us = 250.0, .sr_enter_plus_exit_z8_time_us = 350.0, .fclk_change_latency_us = 24.0, -- 2.51.0