[PATCH 0/8] drm + usb-type-c: Add support for out-of-band hotplug notification (v4 resend)

[Lyude Paul]

This looks great to me! Wasn't much to comment on here as most of this looks
fine to me. For the whole series:

Reviewed-by: Lyude Paul <lyude at redhat.com>

This will be quite interesting to try getting working for nouveau

On Tue, 2021-08-17 at 23:51 +0200, Hans de Goede wrote:
> Hi all,
> 
> Here is a rebased-resend of v4 of my patchset making DP over Type-C work on
> devices where the Type-C controller does not drive the HPD pin on the GPU,
> but instead we need to forward HPD events from the Type-C controller to
> the DRM driver.
> 
> Changes in v4 resend:
> - Rebase on top of latest drm-tip
> 
> Changes in v4:
> - Rebase on top of latest drm-tip
> - Add forward declaration for struct fwnode_handle to drm_crtc_internal.h
>   (fixes warning reported by kernel test robot <lkp at intel.com>)
> - Add Heikki's Reviewed-by to patch 7 & 8
> - Add Heikki's Tested-by to the series
> 
> Changes in v3:
> - Base on top of latest drm-tip, which should fix the CI being unable to
>   apply (and thus to test) the patches
> - Make intel_acpi_assign_connector_fwnodes() take a ref on the fwnode
>   it stores in connector->fwnode and have drm_connector_cleanup() put
>   this reference
> - Drop data argument from drm_connector_oob_hotplug_event()
> - Make the Type-C DP altmode code only call
> drm_connector_oob_hotplug_event()
>   when the HPD bit in the status vdo changes
> - Drop the platform/x86/intel_cht_int33fe: Correct "displayport" fwnode
>   reference patch, this will be merged independently through the pdx86 tree
> 
> Changes in v2:
> - Replace the bogus "drm/connector: Make the drm_sysfs connector->kdev
>   device hold a reference to the connector" patch with:
>   "drm/connector: Give connector sysfs devices there own device_type"
>   the new patch is a dep for patch 2/9 see the patches
> 
> - Stop using a class-dev-iter, instead at a global connector list
>   to drm_connector.c and use that to find the connector by the fwnode,
>   similar to how we already do this in drm_panel.c and drm_bridge.c
> 
> - Make drm_connector_oob_hotplug_event() take a fwnode pointer as
>   argument, rather then a drm_connector pointer and let it do the
>   lookup itself. This allows making drm_connector_find_by_fwnode() a
>   drm-internal function and avoids code outside the drm subsystem
>   potentially holding on the a drm_connector reference for a longer
>   period.
> 
> This series not only touches drm subsys files but it also touches
> drivers/usb/typec/altmodes/typec_displayport.c, that file usually
> does not see a whole lot of changes. So I believe it would be best
> to just merge the entire series through drm-misc, Assuming we can
> get an ack from Greg for merging the typec_displayport.c changes
> this way.
> 
> Regards,
> 
> Hans
> 
> Hans de Goede (7):
>   drm/connector: Give connector sysfs devices there own device_type
>   drm/connector: Add a fwnode pointer to drm_connector and register with
>     ACPI (v2)
>   drm/connector: Add drm_connector_find_by_fwnode() function (v3)
>   drm/connector: Add support for out-of-band hotplug notification (v3)
>   drm/i915/dp: Add support for out-of-bound hotplug events
>   usb: typec: altmodes/displayport: Make dp_altmode_notify() more
>     generic
>   usb: typec: altmodes/displayport: Notify drm subsys of hotplug events
> 
> Heikki Krogerus (1):
>   drm/i915: Associate ACPI connector nodes with connector entries (v2)
> 
>  drivers/gpu/drm/drm_connector.c              | 79 ++++++++++++++++++
>  drivers/gpu/drm/drm_crtc_internal.h          |  2 +
>  drivers/gpu/drm/drm_sysfs.c                  | 87 +++++++++++++++++---
>  drivers/gpu/drm/i915/display/intel_acpi.c    | 46 +++++++++++
>  drivers/gpu/drm/i915/display/intel_acpi.h    |  3 +
>  drivers/gpu/drm/i915/display/intel_display.c |  1 +
>  drivers/gpu/drm/i915/display/intel_dp.c      | 12 +++
>  drivers/usb/typec/altmodes/Kconfig           |  1 +
>  drivers/usb/typec/altmodes/displayport.c     | 58 ++++++++-----
>  include/drm/drm_connector.h                  | 25 ++++++
>  10 files changed, 279 insertions(+), 35 deletions(-)
> 

-- 
Cheers,
 Lyude Paul (she/her)
 Software Engineer at Red Hat