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drm/dp_mst: Add DSC enablement helpers to DRM

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Adding a helper function to be called by
drivers outside of DRM to enable DSC on
the MST ports.

Function is called to recalculate VCPI allocation
if DSC is enabled and raise the DSC flag to enable.
In case of disabling DSC the flag is set to false
and recalculation of VCPI slots is expected to be done
in encoder's atomic_check.

v2: squash separate functions into one and call it per
port
v3: Fix comment typos

Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Mikita Lipski <mikita.lipski@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Mikita Lipski
2019-10-28 17:33:32 -04:00
committed by Alex Deucher
parent 1c6c1cb5af
commit 8afb7e6afa
2 changed files with 66 additions and 0 deletions
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5
include/drm/drm_dp_mst_helper.h
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@ -502,6 +502,7 @@ struct drm_dp_payload {
struct drm_dp_vcpi_allocation {
struct drm_dp_mst_port *port;
int vcpi;
bool dsc_enabled;
struct list_head next;
};
@ -781,6 +782,10 @@ drm_dp_atomic_find_vcpi_slots(struct drm_atomic_state *state,
struct drm_dp_mst_topology_mgr *mgr,
struct drm_dp_mst_port *port, int pbn,
int pbn_div);
int drm_dp_mst_atomic_enable_dsc(struct drm_atomic_state *state,
struct drm_dp_mst_port *port,
int pbn, int pbn_div,
bool enable);
int __must_check
drm_dp_atomic_release_vcpi_slots(struct drm_atomic_state *state,
struct drm_dp_mst_topology_mgr *mgr,