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

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Message-Id: <20240809193600.3360015-1-sean.anderson@linux.dev>
Date: Fri,  9 Aug 2024 15:35:52 -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>,
	Sean Anderson <sean.anderson@...ux.dev>
Subject: [PATCH v6 0/8] 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.

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

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2.35.1.1320.gc452695387.dirty