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 5A1DF23C4F2; Tue, 11 Nov 2025 01:18:07 +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=1762823890; cv=none; b=KKUr9MbSbqAQjEHnXDae8TnGvVeeauQ7eDJoZp86RN2/S9/qwM2cyxEmzHObImw9g+Dhrv49TAn0dGC+SFnv3iv6VBmAvDBDMvolILMBjviM/ucJfauceEtQ9X685wN47tvoLPvC9AKYRNG8ZZfSLm4Lmvf+BlnmmDpW6CoicBE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1762823890; c=relaxed/simple; bh=ZXO5aHmXoKoirKr1X9c4HlE8BLw0UCCJyRv3AknyRqY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=E15nz22Y/7+JNdAdoVR7TSuE8rYoWXg1nPgDMyHNLtQtBPuuhXKDR/QxW4QICXLKJDOulD6BlUAqc4OSpJc6hzluIo5iWfa4hXO0rg8Of5GF7Qw1PEyHil4ybRShXy4Gulmuj6ZMDilwlNz459skrosRzITJLXVqBHG/DxM1KYU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=mU1j5kO1; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="mU1j5kO1" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9331AC116B1; Tue, 11 Nov 2025 01:18:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1762823887; bh=ZXO5aHmXoKoirKr1X9c4HlE8BLw0UCCJyRv3AknyRqY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mU1j5kO1QAVviGqjGsiN2V6IP1O/lSyLkJ69jEsteQTO9zODe7Br9IIJDmEctsktV nMacD6i3CjZODcNz583aD3+cZi7rqy7zPQf7KuYwDqI+cb/LEeF1GI6JgSHX7VPEEx ccbvOUkMWuHxQb7AaLbyRqcGAsy2bIez0tbdcCWU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Chris Park , Relja Vojvodic , Alex Hung , Dan Wheeler , Alex Deucher , Sasha Levin Subject: [PATCH 6.17 391/849] drm/amd/display: Increase minimum clock for TMDS 420 with pipe splitting Date: Tue, 11 Nov 2025 09:39:21 +0900 Message-ID: <20251111004545.886344043@linuxfoundation.org> X-Mailer: git-send-email 2.51.2 In-Reply-To: <20251111004536.460310036@linuxfoundation.org> References: <20251111004536.460310036@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.17-stable review patch. If anyone has any objections, please let me know. ------------------ From: Relja Vojvodic [ Upstream commit 002a612023c8b105bd3829d81862dee04368d6de ] [Why] -Pipe splitting allows for clocks to be reduced, but when using TMDS 420, reduced clocks lead to missed clocks cycles on clock resyncing [How] -Impose a minimum clock when using TMDS 420 Reviewed-by: Chris Park Signed-off-by: Relja Vojvodic Signed-off-by: Alex Hung Tested-by: Dan Wheeler Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- .../src/dml2_core/dml2_core_dcn4_calcs.c | 28 +++++++++++++------ 1 file changed, 19 insertions(+), 9 deletions(-) diff --git a/drivers/gpu/drm/amd/display/dc/dml2/dml21/src/dml2_core/dml2_core_dcn4_calcs.c b/drivers/gpu/drm/amd/display/dc/dml2/dml21/src/dml2_core/dml2_core_dcn4_calcs.c index b9cff21985110..bf62d42b3f78b 100644 --- a/drivers/gpu/drm/amd/display/dc/dml2/dml21/src/dml2_core/dml2_core_dcn4_calcs.c +++ b/drivers/gpu/drm/amd/display/dc/dml2/dml21/src/dml2_core/dml2_core_dcn4_calcs.c @@ -1238,18 +1238,27 @@ static void CalculateDETBufferSize( static double CalculateRequiredDispclk( enum dml2_odm_mode ODMMode, - double PixelClock) + double PixelClock, + bool isTMDS420) { + double DispClk; if (ODMMode == dml2_odm_mode_combine_4to1) { - return PixelClock / 4.0; + DispClk = PixelClock / 4.0; } else if (ODMMode == dml2_odm_mode_combine_3to1) { - return PixelClock / 3.0; + DispClk = PixelClock / 3.0; } else if (ODMMode == dml2_odm_mode_combine_2to1) { - return PixelClock / 2.0; + DispClk = PixelClock / 2.0; } else { - return PixelClock; + DispClk = PixelClock; + } + + if (isTMDS420) { + double TMDS420MinPixClock = PixelClock / 2.0; + DispClk = math_max2(DispClk, TMDS420MinPixClock); } + + return DispClk; } static double TruncToValidBPP( @@ -4122,11 +4131,12 @@ static noinline_for_stack void CalculateODMMode( bool success; bool UseDSC = DSCEnable && (NumberOfDSCSlices > 0); enum dml2_odm_mode DecidedODMMode; + bool isTMDS420 = (OutFormat == dml2_420 && Output == dml2_hdmi); - SurfaceRequiredDISPCLKWithoutODMCombine = CalculateRequiredDispclk(dml2_odm_mode_bypass, PixelClock); - SurfaceRequiredDISPCLKWithODMCombineTwoToOne = CalculateRequiredDispclk(dml2_odm_mode_combine_2to1, PixelClock); - SurfaceRequiredDISPCLKWithODMCombineThreeToOne = CalculateRequiredDispclk(dml2_odm_mode_combine_3to1, PixelClock); - SurfaceRequiredDISPCLKWithODMCombineFourToOne = CalculateRequiredDispclk(dml2_odm_mode_combine_4to1, PixelClock); + SurfaceRequiredDISPCLKWithoutODMCombine = CalculateRequiredDispclk(dml2_odm_mode_bypass, PixelClock, isTMDS420); + SurfaceRequiredDISPCLKWithODMCombineTwoToOne = CalculateRequiredDispclk(dml2_odm_mode_combine_2to1, PixelClock, isTMDS420); + SurfaceRequiredDISPCLKWithODMCombineThreeToOne = CalculateRequiredDispclk(dml2_odm_mode_combine_3to1, PixelClock, isTMDS420); + SurfaceRequiredDISPCLKWithODMCombineFourToOne = CalculateRequiredDispclk(dml2_odm_mode_combine_4to1, PixelClock, isTMDS420); #ifdef __DML_VBA_DEBUG__ DML_LOG_VERBOSE("DML::%s: ODMUse = %d\n", __func__, ODMUse); DML_LOG_VERBOSE("DML::%s: Output = %d\n", __func__, Output); -- 2.51.0