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 3EB65230278 for ; Tue, 3 Jun 2025 12:48:32 +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=1748954915; cv=none; b=R/uEToQbFJzlMqQUGoPwPzaJLIfs/LJVDFlQaaMhyjIVo+oUN6XRAecNhzE0SSjiHAcdEfK0ySgXHxDwh43G+i1veYUBAO7qbQfcVtgs8tc4IplRMOzo/ktj37qAWs+A7CeTNABcEhPSNLZDd0Nc6qH8tQPVANlIpc0+leQJMjU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1748954915; c=relaxed/simple; bh=1Qplk4074K4KUwW1LP3wsbOBRE+6V7jaRgPpvk5Qnjg=; h=Message-ID:Date:MIME-Version:Subject:From:To:Cc:References: In-Reply-To:Content-Type; b=f0d4u7jQYHbfDmSbSuLhfm5qjQ3DNiEHk1gBAUrGJth0cMJV7Lm63OsXdDDkQo2fvXTntot8JnTpf4aioTexyAAAmMRFJNvAE6bgYOJwatSi0wKQoSfN4VGvVzQg7KjoEsBQtXLujXqTmHocVErZxKKpFz9cYDVyFIofeOQIRUA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (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=kZsJAs37; arc=none smtp.client-ip=213.167.242.64 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (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="kZsJAs37" 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 A9347D7; Tue, 3 Jun 2025 14:48:27 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1748954908; bh=1Qplk4074K4KUwW1LP3wsbOBRE+6V7jaRgPpvk5Qnjg=; h=Date:Subject:From:To:Cc:References:In-Reply-To:From; b=kZsJAs377KSjp8h3VYAiQR2pUOGgnFo6OGYdp6v0ucbhxKbE1vWmsLhOOQIy6sP85 kjt02FlGmgkaijGh33JJEziRTNWOa6Zjgnn+zovuKB+dUt+72SdR6niEe46GAurfKA 7dLLwfIEA0MXRtSGu/O6PSPUEslI8oav+E5sBGZk= Message-ID: <9c2c151d-f210-4fbc-af7c-d6aa5838cede@ideasonboard.com> Date: Tue, 3 Jun 2025 15:48:26 +0300 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 v12 0/5] drm/atomic-helper: Re-order CRTC and Bridge ops From: Tomi Valkeinen To: Maarten Lankhorst , Thomas Zimmermann , Maxime Ripard Cc: Nishanth Menon , Vignesh Raghavendra , Devarsh Thakkar , Praneeth Bajjuri , Udit Kumar , Jayesh Choudhary , Alexander Sverdlin , DRI Development List , Linux Kernel List , Aradhya Bhatia , Dmitry Baryshkov , Laurent Pinchart , Andrzej Hajda , Neil Armstrong , Robert Foss , Jonas Karlman , Jernej Skrabec , David Airlie , Simona Vetter References: <20250406131642.171240-1-aradhya.bhatia@linux.dev> <19101cd7-5b4d-416d-a00e-6657b81149a6@ideasonboard.com> Content-Language: en-US Autocrypt: addr=tomi.valkeinen@ideasonboard.com; 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charset=UTF-8 Content-Transfer-Encoding: 8bit Hi Maxime, Maarten, Thomas, (You're the first three names returned with get_maintainers.pl =), so:) Ping on this. Tomi On 26/05/2025 13:40, Tomi Valkeinen wrote: > Hi Maxime, Maarten, Thomas, > > On 16/05/2025 15:23, Tomi Valkeinen wrote: >> Hi all, >> >> On 06/04/2025 16:16, Aradhya Bhatia wrote: >>> Hello all, >>> >>> This series re-orders the sequences in which the drm CRTC and the drm >>> Bridge get enabled and disabled with respect to each other. >>> >>> The bridge pre_enable calls have been shifted before the crtc_enable and >>> the bridge post_disable calls have been shifted after the crtc_disable. >>> >>> This has been done as per the definition of bridge pre_enable. >>> "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. >> >> Any further comments to this? >> >> All the patches have been reviewed and tested. I can push this, along >> with the serieses that depend on this, via drm-misc, but I'll need an >> ack from a maintainer. > > Would any of you have a moment to check this out and ack/apply? This > series is blocking further development on DSI and OLDI. > > Tomi > >> >>  Tomi >> >> >>> The original sequence. for display pipe enable looks like: >>> >>>        crtc_enable >>> >>>        bridge[n]_pre_enable >>>        ... >>>        bridge[1]_pre_enable >>> >>>        encoder_enable >>> >>>        bridge[1]_enable >>>        ... >>>        bridge[n]_enable >>> >>> The sequence of enable after this patch-set will look like: >>> >>>        bridge[n]_pre_enable >>>        ... >>>        bridge[1]_pre_enable >>> >>>        crtc_enable >>>        encoder_enable >>> >>>        bridge[1]_enable >>>        ... >>>        bridge[n]_enable >>> >>> >>> For the disable sequence, this is what the original looks like: >>> >>>        bridge[n]_disable >>>        ... >>>        bridge[1]_disable >>> >>>        encoder_disable >>> >>>        bridge[1]_post_disable >>>        ... >>>        bridge[n]_post_disable >>> >>>        crtc_disable >>>      >>> This is what the disable sequence will be, after this series of patches: >>> >>>        bridge[n]_disable >>>        ... >>>        bridge[1]_disable >>> >>>        encoder_disable >>>        crtc_disable >>> >>>        bridge[1]_post_disable >>>        ... >>>        bridge[n]_post_disable >>> >>> This series further updates the bridge API definitions to accurately >>> reflect the updated scenario. >>> >>> This series is a subset of its v11[0] which had 14 patches in the >>> revision. >>> 9 of those 14 patches (which were specific to the cdns-dsi bridge driver) >>> were merged[1]. >>> >>> Regards >>> Aradhya >>> >>> --- >>> * Note on checkpatch warning in patch 2/4 * >>> Patch 2/4 causes the checkpatch to flare up for 1 checkpatch 'check' - >>> >>> CHECK: Lines should not end with a '(' >>> #79: FILE: drivers/gpu/drm/drm_atomic_helper.c:1304: >>> +                       new_crtc_state = drm_atomic_get_new_crtc_state( >>> >>> This patch is largely duplicating the original code, with minor >>> differences to >>> perform different operations. This line of code pre-exists in the file >>> and >>> have simply been duplicated. I have decided to keep it as is to >>> maintain the >>> uniformity and the originally intended readability. Should perhaps a >>> fix be >>> required, this patch/series is not the right place, and another patch >>> can be >>> created to fix this across the whole file. >>> >>> References: >>> [0]: Revision v11 of this series. >>> https://lore.kernel.org/all/20250329113925.68204-1- >>> aradhya.bhatia@linux.dev/ >>> >>> [1]: Patches 1 through 9 getting merged. >>> https://lore.kernel.org/ >>> all/174335361171.2556605.12634785416741695829.b4-ty@oss.qualcomm.com/ >>> >>> >>> --- >>> Change Log: >>> >>>    - Changes in v12: >>>      - Drop patches 1 through 9 since they have been merged. >>>      - Rebase onto newer drm-misc-next. >>>      - Re-word the patch 3/4, ("drm/bridge: Update the bridge enable/ >>> disable doc") >>>        to make it more readable. >>> >>>    - Changes in v11: >>>      - Add patch v11:13/14 ("drm/bridge: Update the bridge enable/ >>> disable doc"), >>>        that updates the documentation about the order of the various >>> bridge >>>        enable/disable hooks being called wrt the CRTC and encoder hooks. >>>      - Rebase on drm-misc-next instead of linux-next. >>>        As part of rebase, accommodate the following change: >>>        - Change patch v10:08/13 ("drm/bridge: cdns-dsi: Support atomic >>> bridge >>>          APIs") to v11:08/13 ("drm/bridge: cdns-dsi: Add input format >>>          negotiation"), since Maxime has already updated the bridge >>> hooks to >>>          their atomic versions in commit 68c98e227a96 ("drm/bridge: >>> cdns-csi: >>>          Switch to atomic helpers"). >>>          My new patch now only adds the format negotiation hook for >>> the cdns-dsi. >>>          (Note: Since the new patch is now only a subset of the old >>> one, without >>>          any change in logic, I decided to carry forward the R-b and >>> T-b tags.) >>>      - Add Alexander Sverdlin's T-b in patches 10, 11, 12. >>> >>>    - Changes in v10: >>>      - Rebase on latest linux-next (next-20250226). >>>      - As part of rebase, update the patches to accommodate a couple of >>>        widespread changes in DRM Framework - >>>          - All the ("drm/atomic-helper: Change parameter name of ***") >>> commits. >>>          - All the ("drm/bridge: Pass full state to ***") commits. >>>        (These updates are only trivial substitutions.) >>>      - Add Tomi Valkeinen's T-b tags in all the patches. >>> >>>    - Changes in v9: >>>      - Fix the oops in 11/13 - where the encoder_bridge_enable _was_ >>> pre_enabling >>>        the bridges instead of enabling. >>>      - Add the following tags: >>>        - Dmitry Baryshkov's R-b in patches 2, 10, 11, and A-b in patch >>> 12. >>>        - Jayesh Choudhary's R-b in patch 12. >>>        - Tomi Valkeinen's R-b in patches 2, 10, 11, 12. >>> >>>    - Changes in v8: >>>      - Move the phy de-initialization to bridge post_disable() instead >>> of bridge >>>        disable() in patch-3. >>>      - Copy the private bridge state (dsi_cfg), in addition to the >>> bridge_state, >>>        in patch-9. >>>      - Split patch v7:11/12 into three patches, v8:{10,11,12}/13, to >>> separate out >>>        different refactorings into different patches, and improve >>> bisectability. >>>      - Move patch v7:02/12 down to v8:06/12, to keep the initial >>> patches for >>>        fixes only. >>>      - Drop patch v7:04/12 as it doesn't become relevant until patch >>> v7:12/12. >>>      - Add R-b tags of Dmitry Baryshkov in patch-9 and patch-3, and of >>>        Tomi Valkeinen in patch-9. >>>        - Changes in v7: >>>      - phy_init()/exit() were called from the PM path in v6. Change it >>> back to >>>        the bridge enable/disable path in patch-3, so that the >>> phy_init() can go >>>        back to being called after D-Phy reset assert. >>>      - Reword commit text in patch-5 to explain the need of the fix. >>>      - Drop the stray code in patch-10. >>>      - Add R-b tag of Dmitry Baryshkov in patch-6. >>> >>>    - Changes in v6: >>>      - Reword patch 3 to better explain the fixes around phy de-init. >>>      - Fix the Lane ready timeout condition in patch 7. >>>      - Fix the dsi _bridge_atomic_check() implementation by adding a new >>>        bridge state structure in patch 10. >>>      - Rework and combine patches v5:11/13 and v5:12/13 to v6:11/12. >>>      - Generate the patches of these series using the "patience" >>> algorithm. >>>        Note: All patches, except v6:11/12, *do not* differ from their >>> default >>>        (greedy) algorithm variants. >>>        For patch 11, the patience algorithm significantly improves the >>> readability. >>>      - Rename and move the Bridge enable/disable enums from public to >>> private >>>        in patch 11. >>>      - Add R-b tags of Tomi Valkeinen in patch 6, and Dmitry Baryshkov >>> in patch 2. >>> >>>    - Changes in v5: >>>      - Fix subject and description in patch 1/13. >>>      - Add patch to check the return value of >>>        phy_mipi_dphy_get_default_config() (patch: 6/13). >>>      - Change the Clk and Data Lane ready timeout from forever to 5s. >>>      - Print an error instead of calling WARN_ON_ONCE in patch 7/13. >>>      - Drop patch v4-07/11: "drm/bridge: cdns-dsi: Reset the DCS write >>> FIFO". >>>        There has been some inconsistencies found with this patch upon >>> further >>>        testing. This patch was being used to enable a DSI panel based >>> on ILITEK >>>        ILI9881C bridge. This will be debugged separately. >>>      - Add patch to move the DSI mode check from _atomic_enable() to >>>        _atomic_check() (patch: 10/13). >>>      - Split patch v4-10/11 into 2 patches - 11/13 and 12/13. >>>        Patch 11/13 separates out the Encoder-Bridge operations into a >>> helper >>>        function *without* changing the logic. Patch 12/13 then changes >>> the order >>>        of the encoder-bridge operations as was intended in the >>> original patch. >>>      - Add detailed comment for patch 13/13. >>>      - Add Tomi Valkeinen's R-b in patches 1, 2, 4, 5, 7, 8, 9, 13. >>> >>>    - Changes in v4: >>>      - Add new patch, "drm/bridge: cdns-dsi: Move to >>> devm_drm_of_get_bridge()", >>>        to update to an auto-managed way of finding next bridge in the >>> chain. >>>      - Drop patch "drm/bridge: cdns-dsi: Fix the phy_initialized >>> variable" and >>>        add "drm/bridge: cdns-dsi: Fix Phy _init() and _exit()" that >>> properly >>>        de-initializes the Phy and maintains the initialization state. >>>      - Reword patch "drm/bridge: cdns-dsi: Reset the DCS write FIFO" >>> to explain >>>        the HW concerns better. >>>      - Add R-b tag from Dmitry Baryshkov for patches 1/11 and 8/11. >>> >>>    - Changes in v3: >>>      - Reword the commit message for patch "drm/bridge: cdns-dsi: Fix >>> OF node >>>        pointer". >>>      - Add a new helper API to figure out DSI host input pixel format >>>        in patch "drm/mipi-dsi: Add helper to find input format". >>>      - Use a common function for bridge pre-enable and enable, and >>> bridge disable >>>        and post-disable, to avoid code duplication. >>>      - Add T-b tag from Dominik Haller in patch 5/10. (Missed to add >>> it in v2). >>>      - Add R-b tag from Dmitry Baryshkov for patch 8/10. >>> >>>    - Changes in v2: >>>      - Drop patch "drm/tidss: Add CRTC mode_fixup" >>>      - Split patch "drm/bridge: cdns-dsi: Fix minor bugs" into 4 >>> separate ones >>>      - Drop support for early_enable/late_disable APIs and instead re- >>> order the >>>        pre_enable / post_disable APIs to be called before / after >>> crtc_enable / >>>        crtc_disable. >>>      - Drop support for early_enable/late_disable in cdns-dsi and use >>>        pre_enable/post_disable APIs instead to do bridge enable/disable. >>> >>> >>> Previous versions: >>> >>> v1:  https://lore.kernel.org/all/20240511153051.1355825-1-a- >>> bhatia1@ti.com/ >>> v2:  https://lore.kernel.org/all/20240530093621.1925863-1-a- >>> bhatia1@ti.com/ >>> v3:  https://lore.kernel.org/all/20240617105311.1587489-1-a- >>> bhatia1@ti.com/ >>> v4:  https://lore.kernel.org/all/20240622110929.3115714-1-a- >>> bhatia1@ti.com/ >>> v5:  https://lore.kernel.org/all/20241019195411.266860-1- >>> aradhya.bhatia@linux.dev/ >>> v6:  https://lore.kernel.org/all/20250111192738.308889-1- >>> aradhya.bhatia@linux.dev/ >>> v7:  https://lore.kernel.org/all/20250114055626.18816-1- >>> aradhya.bhatia@linux.dev/ >>> v8:  https://lore.kernel.org/all/20250126191551.741957-1- >>> aradhya.bhatia@linux.dev/ >>> v9:  https://lore.kernel.org/all/20250209121032.32655-1- >>> aradhya.bhatia@linux.dev/ >>> v10: https://lore.kernel.org/all/20250226155228.564289-1- >>> aradhya.bhatia@linux.dev/ >>> v11: https://lore.kernel.org/all/20250329113925.68204-1- >>> aradhya.bhatia@linux.dev/ >>> >>> --- >>> >>> Aradhya Bhatia (5): >>>    drm/atomic-helper: Refactor crtc & encoder-bridge op loops into >>>      separate functions >>>    drm/atomic-helper: Separate out bridge pre_enable/post_disable from >>>      enable/disable >>>    drm/atomic-helper: Re-order bridge chain pre-enable and post-disable >>>    drm/bridge: Update the bridge enable/disable doc >>>    drm/bridge: cdns-dsi: Use pre_enable/post_disable to enable/disable >>> >>>   .../gpu/drm/bridge/cadence/cdns-dsi-core.c    |  64 +++-- >>>   drivers/gpu/drm/drm_atomic_helper.c           | 160 +++++++++-- >>>   include/drm/drm_bridge.h                      | 249 +++++++++++++----- >>>   3 files changed, 355 insertions(+), 118 deletions(-) >>> >>> >>> base-commit: dd717762761807452ca25634652e180a80349cd8 >> >