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| author | Lyude Paul <lyude@redhat.com> | 2019-03-13 20:51:41 +0300 |
|---|---|---|
| committer | Lyude Paul <lyude@redhat.com> | 2019-10-24 21:23:55 +0300 |
| commit | c485e2c97dae4e13f239ccad455070e99213dd4b (patch) | |
| tree | c9e777e6d221871f96bbd997bcc16d38327ea4ce /include/drm | |
| parent | d29333cf5cd7594bd9a6bac10cbb4ec7079dc9a3 (diff) | |
| download | linux-c485e2c97dae4e13f239ccad455070e99213dd4b.tar.xz | |
drm/dp_mst: Refactor pdt setup/teardown, add more locking
Since we're going to be implementing suspend/resume reprobing very soon,
we need to make sure we are extra careful to ensure that our locking
actually protects the topology state where we expect it to. Turns out
this isn't the case with drm_dp_port_setup_pdt() and
drm_dp_port_teardown_pdt(), both of which change port->mstb without
grabbing &mgr->lock.
Additionally, since most callers of these functions are just using it to
teardown the port's previous PDT and setup a new one we can simplify
things a bit and combine drm_dp_port_setup_pdt() and
drm_dp_port_teardown_pdt() into a single function:
drm_dp_port_set_pdt(). This function also handles actually ensuring that
we grab the correct locks when we need to modify port->mstb.
Cc: Juston Li <juston.li@intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Harry Wentland <hwentlan@amd.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Reviewed-by: Sean Paul <sean@poorly.run>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191022023641.8026-4-lyude@redhat.com
Diffstat (limited to 'include/drm')
| -rw-r--r-- | include/drm/drm_dp_mst_helper.h | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/include/drm/drm_dp_mst_helper.h b/include/drm/drm_dp_mst_helper.h index b2160c366fb7..8ba2a01324bb 100644 --- a/include/drm/drm_dp_mst_helper.h +++ b/include/drm/drm_dp_mst_helper.h @@ -55,8 +55,10 @@ struct drm_dp_vcpi { * @num_sdp_stream_sinks: Number of stream sinks * @available_pbn: Available bandwidth for this port. * @next: link to next port on this branch device - * @mstb: branch device attach below this port - * @aux: i2c aux transport to talk to device connected to this port. + * @mstb: branch device on this port, protected by + * &drm_dp_mst_topology_mgr.lock + * @aux: i2c aux transport to talk to device connected to this port, protected + * by &drm_dp_mst_topology_mgr.lock * @parent: branch device parent of this port * @vcpi: Virtual Channel Payload info for this port. * @connector: DRM connector this port is connected to. |