linux-kernel - [PATCH v5 00/10] drm: zynqmp_dp: IRQ cleanups and debugfs support

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Message-Id: <20240503192922.2172314-1-sean.anderson@linux.dev>
Date: Fri,  3 May 2024 15:29:12 -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-arm-kernel@...ts.infradead.org,
	David Airlie <airlied@...il.com>,
	linux-kernel@...r.kernel.org,
	Daniel Vetter <daniel@...ll.ch>,
	Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
	Michal Simek <michal.simek@....com>,
	Sean Anderson <sean.anderson@...ux.dev>
Subject: [PATCH v5 00/10] drm: zynqmp_dp: IRQ cleanups and debugfs support

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.

Last time 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 v5:
- Fix AUX bus not getting unregistered
- Rebase onto drm-misc/drm-misc-next

Changes in v4:
- Rebase onto drm/drm-next

Changes in v3:
- Don't delay work
- Convert to a hard IRQ
- Use AUX IRQs instead of polling
- Take dp->lock in zynqmp_dp_hpd_work_func

Changes in v2:
- Rearrange zynqmp_dp for better padding
- 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 (10):
  drm: zynqmp_kms: Fix AUX bus not getting unregistered
  drm: zynqmp_dp: Rearrange zynqmp_dp for better padding
  drm: zynqmp_dp: Don't delay work
  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  | 883 +++++++++++++++++++++++++++---
 drivers/gpu/drm/xlnx/zynqmp_kms.c |  12 +-
 5 files changed, 977 insertions(+), 69 deletions(-)
 create mode 100644 Documentation/gpu/zynqmp.rst

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