linux-kernel - Re: [PATCH v3 00/13] drm: zynqmp_dp: IRQ cleanups and debugfs support

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Date: Mon, 22 Apr 2024 14:48:11 -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,
 Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Cc: David Airlie <airlied@...il.com>, Daniel Vetter <daniel@...ll.ch>,
 linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 Michal Simek <michal.simek@....com>
Subject: Re: [PATCH v3 00/13] drm: zynqmp_dp: IRQ cleanups and debugfs support

On 4/22/24 14:45, 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.
> 
> 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 v3:
> - Store base pointers in zynqmp_disp directly
> - 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:
> - Fix kerneldoc
> - 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 (13):
>   drm: xlnx: Store base pointers in zynqmp_disp directly
>   drm: xlnx: Fix kerneldoc
>   drm: zynqmp_dp: Downgrade log level for aux retries message
>   drm: zynqmp_dp: Adjust training values per-lane
>   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_disp.c  |  44 +-
>  drivers/gpu/drm/xlnx/zynqmp_dp.c    | 909 +++++++++++++++++++++++++---
>  drivers/gpu/drm/xlnx/zynqmp_dpsub.h |   1 +
>  drivers/gpu/drm/xlnx/zynqmp_kms.h   |   4 +-
>  7 files changed, 1000 insertions(+), 109 deletions(-)
>  create mode 100644 Documentation/gpu/zynqmp.rst
> 

+CC Tomi, who I forgot to add initially...