From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) (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 37342236A91 for ; Tue, 14 Jan 2025 13:04:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=213.167.242.64 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736859869; cv=none; b=fuCXzk9YlB9Mw53sIStDKl3ki+E/ULQtEUi8V+suLr5PqBiYlY0/VN3VIVeAs8oH3PMbaTU67uG/zhaUZyq7M0qymmohn2L/jj9Nxqd7MUz2uP3JhSc57+0oXf97TbrxkL6IgA8bUuVbxGV18vopB7dsQIFt+MQyGuiIVX2NmfA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736859869; c=relaxed/simple; bh=hEuA5SNqJ6nxlEJkMh30WZJHa+D3Xarfzq3Ez9taWk8=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=IIZFHE0Q6Nor0bS948zD+KznuLr9fthDA1gGO6hEx4u+50XuVy7R4NEgkSgLwNP6WRp2m6/uavPBCFINAxM+muI2MfHhQvT/qWPA3uclkPX7n/PykFAcLGEOLGS9gCtYYQPP2CosrCaIiSOkyxkCbw6MBDKwJWEoCrBCXxogiGo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com; spf=pass smtp.mailfrom=ideasonboard.com; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b=JCsgBStV; arc=none smtp.client-ip=213.167.242.64 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=ideasonboard.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="JCsgBStV" Received: from [192.168.88.20] (91-158-153-178.elisa-laajakaista.fi [91.158.153.178]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 978B3FA8; Tue, 14 Jan 2025 14:03:19 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1736859800; bh=hEuA5SNqJ6nxlEJkMh30WZJHa+D3Xarfzq3Ez9taWk8=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=JCsgBStVurAu0TnMzfT6MJ99HOi4xwAmMrbyhSzCjmB/IpCcID9bQ8iSwYHFmEy0U w6ifdTm4jBacryUqKU7AYg31bf2mtIOAmipunj671Ovb69D9zKhHUuYMM1zIMdhyMI dOj5osulo/shSYKKB0RgUwaFNzJuOCLg5MZ7OrOk= Message-ID: <4518320e-4699-4026-adbe-b28514bde544@ideasonboard.com> Date: Tue, 14 Jan 2025 15:04:12 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v7 11/12] drm/atomic-helper: Re-order bridge chain pre-enable and post-disable To: Dmitry Baryshkov , Aradhya Bhatia Cc: Laurent Pinchart , Andrzej Hajda , Neil Armstrong , Robert Foss , Jonas Karlman , Jernej Skrabec , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Nishanth Menon , Vignesh Raghavendra , Devarsh Thakkar , Praneeth Bajjuri , Udit Kumar , Jayesh Choudhary , DRI Development List , Linux Kernel List References: <20250114055626.18816-1-aradhya.bhatia@linux.dev> <20250114055626.18816-12-aradhya.bhatia@linux.dev> Content-Language: en-US From: Tomi Valkeinen Autocrypt: addr=tomi.valkeinen@ideasonboard.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Hi, On 14/01/2025 13:24, Dmitry Baryshkov wrote: > On Tue, Jan 14, 2025 at 11:26:25AM +0530, Aradhya Bhatia wrote: >> Move the bridge pre_enable call before crtc enable, and the bridge >> post_disable call after the crtc disable. >> >> The sequence of enable after this patch will look like: >> >> bridge[n]_pre_enable >> ... >> bridge[1]_pre_enable >> >> crtc_enable >> encoder_enable >> >> bridge[1]_enable >> ... >> bridge[n]_enable >> >> And, the disable sequence for the display pipeline will look like: >> >> bridge[n]_disable >> ... >> bridge[1]_disable >> >> encoder_disable >> crtc_disable >> >> bridge[1]_post_disable >> ... >> bridge[n]_post_disable >> >> The definition of bridge pre_enable hook says that, >> "The display pipe (i.e. clocks and timing signals) feeding this bridge >> will not yet be running when this callback is called". >> >> Since CRTC is also a source feeding the bridge, it should not be enabled >> before the bridges in the pipeline are pre_enabled. Fix that by >> re-ordering the sequence of bridge pre_enable and bridge post_disable. > > The patch contains both refactoring of the corresponding functions and > changing of the order. Please split it into two separate commits. > >> >> Signed-off-by: Aradhya Bhatia >> Signed-off-by: Aradhya Bhatia >> --- >> drivers/gpu/drm/drm_atomic_helper.c | 300 +++++++++++++++++----------- >> 1 file changed, 181 insertions(+), 119 deletions(-) >> >> diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c >> index 5186d2114a50..ad6290a4a528 100644 >> --- a/drivers/gpu/drm/drm_atomic_helper.c >> +++ b/drivers/gpu/drm/drm_atomic_helper.c >> @@ -74,6 +74,12 @@ >> * also shares the &struct drm_plane_helper_funcs function table with the plane >> * helpers. >> */ >> + >> +enum bridge_chain_operation_type { >> + DRM_BRIDGE_PRE_ENABLE_OR_POST_DISABLE, >> + DRM_BRIDGE_ENABLE_OR_DISABLE, >> +}; >> + > > I have mixed feelings towards this approach. I doubt that it actually > helps. Would you mind replacing it with just 'bool pre_enable' / 'bool > post_disable' arguments? If my memory serves, I suggested the enum. I don't like it too much either. But neither do I like the boolean that much, as this is not a yes/no, on/off case... Then again, maybe boolean is fine here, as the "off" case is the "normal/default" case so it's still ok-ish. But this doesn't matter much, I think. It's internal, and can be trivially adjusted later. Tomi