linux-kernel - Re: [PATCH v6 0/8] drm: zynqmp_dp: IRQ cleanups and debugfs support

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Message-ID: <5e9769dd-459a-4ff3-aebb-bb7057192733@linux.dev>
Date: Tue, 1 Oct 2024 14:31:28 -0400
From: Sean Anderson <sean.anderson@...ux.dev>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 dri-devel@...ts.freedesktop.org
Cc: linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 David Airlie <airlied@...il.com>, Michal Simek <michal.simek@....com>,
 Daniel Vetter <daniel@...ll.ch>,
 Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Subject: Re: [PATCH v6 0/8] drm: zynqmp_dp: IRQ cleanups and debugfs support

On 8/9/24 15:35, Sean Anderson wrote:
> This series cleans up the zyqnmp_dp IRQ and locking situation. Once
> that's done, it adds debugfs support. The intent is to enable compliance
> testing or to help debug signal-integrity issues.
> 
> Previously, I discussed converting the HPD work(s) to a threaded IRQ. I
> did not end up doing that for this series since the steps would be
> 
> - Add locking
> - Move link retraining to a work function
> - Harden the IRQ
> - Merge the works into a threaded IRQ (omitted)
> 
> Which with the exception of the final step is the same as leaving those
> works as-is. Conversion to a threaded IRQ can be done as a follow-up.
> 
> Changes in v6:
> - Unplug DRM device before removal
> - Fix hang upon driver removal
> - Rebase onto drm-misc/drm-misc-next
> 
> Changes in v5:
> - Rebase onto drm-misc/drm-misc-next
> 
> Changes in v4:
> - Rebase onto drm/drm-next
> 
> Changes in v3:
> - Convert to a hard IRQ
> - Use AUX IRQs instead of polling
> - Take dp->lock in zynqmp_dp_hpd_work_func
> 
> Changes in v2:
> - Split off the HPD IRQ work into another commit
> - Expand the commit message
> - Document hpd_irq_work
> - Document debugfs files
> - Add ignore_aux_errors and ignore_hpd debugfs files to replace earlier
>   implicit functionality
> - Attempt to fix unreproducable, spurious build warning
> - Drop "Optionally ignore DPCD errors" in favor of a debugfs file
>   directly affecting zynqmp_dp_aux_transfer.
> 
> Sean Anderson (8):
>   drm: zynqmp_kms: Unplug DRM device before removal
>   drm: zynqmp_dp: Add locking
>   drm: zynqmp_dp: Don't retrain the link in our IRQ
>   drm: zynqmp_dp: Convert to a hard IRQ
>   drm: zynqmp_dp: Use AUX IRQs instead of polling
>   drm: zynqmp_dp: Split off several helper functions
>   drm: zynqmp_dp: Take dp->lock in zynqmp_dp_hpd_work_func
>   drm: zynqmp_dp: Add debugfs interface for compliance testing
> 
>  Documentation/gpu/drivers.rst     |   1 +
>  Documentation/gpu/zynqmp.rst      | 149 ++++++
>  MAINTAINERS                       |   1 +
>  drivers/gpu/drm/xlnx/zynqmp_dp.c  | 846 ++++++++++++++++++++++++++++--
>  drivers/gpu/drm/xlnx/zynqmp_kms.c |   2 +-
>  5 files changed, 951 insertions(+), 48 deletions(-)
>  create mode 100644 Documentation/gpu/zynqmp.rst
> 

ping

--Sean