diff options
| author | Imre Deak <[email protected]> | 2024-08-23 19:29:18 +0300 |
|---|---|---|
| committer | Joonas Lahtinen <[email protected]> | 2024-08-28 11:32:25 +0300 |
| commit | a2ccc33b88e2953a6bf0b309e7e8849cc5320018 (patch) | |
| tree | 31d80114a60d7c547f80a38ddca98e54876bc231 /lib/crypto/mpi/mpi-bit.c | |
| parent | 2955ae8186c8a6f029e429f7890e0c7e5f6e215e (diff) | |
drm/i915/dp_mst: Fix MST state after a sink reset
In some cases the sink can reset itself after it was configured into MST
mode, without the driver noticing the disconnected state. For instance
the reset may happen in the middle of a modeset, or the (long) HPD pulse
generated may be not long enough for the encoder detect handler to
observe the HPD's deasserted state. In this case the sink's DPCD
register programmed to enable MST will be reset, while the driver still
assumes MST is still enabled. Detect this condition, which will tear
down and recreate/re-enable the MST topology.
v2:
- Add a code comment about adjusting the expected DP_MSTM_CTRL register
value for SST + SideBand. (Suraj, Jani)
- Print a debug message about detecting the link reset. (Jani)
- Verify the DPCD MST state only if it wasn't already determined that
the sink is disconnected.
Cc: [email protected]
Cc: Jani Nikula <[email protected]>
Closes: https://gitlab.freedesktop.org/drm/i915/kernel/-/issues/11195
Reviewed-by: Suraj Kandpal <[email protected]> (v1)
Signed-off-by: Imre Deak <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
(cherry picked from commit 594cf78dc36f31c0c7e0de4567e644f406d46bae)
Signed-off-by: Joonas Lahtinen <[email protected]>
Diffstat (limited to 'lib/crypto/mpi/mpi-bit.c')
0 files changed, 0 insertions, 0 deletions