Wayne Lin db1a079569 drm/dp_mst: Handle SST-only branch device case ... [Why] While handling LINK_ADDRESS reply, current code expects a peer device can handle sideband message once the peer device type is reported as DP_PEER_DEVICE_MST_BRANCHING. However, when the connected device is a SST branch case, it can't handle the sideband message(MST_CAP=0 in DPCD 00021h). Current code will try to send LINK_ADDRESS to SST branch device and end up with message timeout and monitor can't display normally. As the result of that, we should take SST branch device into account. [How] According to DP 1.4 spec, we can use Peer_Device_Type as DP_PEER_DEVICE_MST_BRANCHING and Message_Capability_Status as 0 to indicate peer device as a SST-only branch device. Fix following: - Add the function drm_dp_mst_is_dp_mst_end_device() to decide whether a peer device connected to a DFP is mst end device. Which also indicates if the peer device is capable of handling message or not. - Take SST-only branch device case into account in drm_dp_port_set_pdt() and add a new parameter 'new_mcs'. Take sst branch device case as the same case as DP_PEER_DEVICE_DP_LEGACY_CONV and DP_PEER_DEVICE_SST_SINK. All original handling logics remain. - Take SST-only branch device case into account in drm_dp_mst_port_add_connector(). - Fix some parts in drm_dp_mst_handle_link_address_port() to have SST branch device case into consideration. - Fix the arguments of drm_dp_port_set_pdt() in drm_dp_mst_handle_conn_stat(). - Have SST branch device also report connector_status_connected when the ddps is true in drm_dp_mst_detect_port() - Fix the arguments of drm_dp_port_set_pdt() in drm_dp_delayed_destroy_port() Changes since v1:(https://patchwork.kernel.org/patch/11323079/) * Squash previous patch into one patch and merge the commit message here. * Combine the if statements mentioned in comments Fixes: c485e2c97d ("drm/dp_mst: Refactor pdt setup/teardown, add more locking") Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Harry Wentland <hwentlan@amd.com> Cc: Lyude Paul <lyude@redhat.com> Signed-off-by: Wayne Lin <Wayne.Lin@amd.com> Reviewed-by: Lyude Paul <lyude@redhat.com> Signed-off-by: Lyude Paul <lyude@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20200117060350.26358-2-Wayne.Lin@amd.com		2020-01-17 19:17:00 -05:00
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drm	drm/dp_mst: Handle SST-only branch device case	2020-01-17 19:17:00 -05:00
host1x	gpu: host1x: Unconditionally select IOMMU_IOVA	2019-11-01 10:49:17 +01:00
ipu-v3	gpu: ipu-v3: image-convert: only sample into the next tile if necessary	2019-08-19 16:25:30 +02:00
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