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drm: Update MST First Link Slot Information Based on Encoding Format

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8b/10b encoding format requires to reserve the first slot for
recording metadata. Real data transmission starts from the second slot,
with a total of available 63 slots available.

In 128b/132b encoding format, metadata is transmitted separately
in LLCP packet before MTP. Real data transmission starts from
the first slot, with a total of 64 slots available.

v2:
* Move total/start slots to mst_state, and copy it to mst_mgr in
atomic_check

v3:
* Only keep the slot info on the mst_state
* add a start_slot parameter to the payload function, to facilitate non
  atomic drivers (this is a temporary workaround and should be removed when
  we are moving out the non atomic driver helpers)

v4:
*fixed typo and formatting

v5: (no functional changes)
* Fixed formatting in drm_dp_mst_update_slots()
* Reference mst_state instead of mst_state->mgr for debugging info

Signed-off-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Fangzhi Zuo <Jerry.Zuo@amd.com>
[v5 nitpicks]
Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: Lyude Paul <lyude@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211025223825.301703-3-lyude@redhat.com
This commit is contained in:
Bhawanpreet Lakha
2021-10-25 18:38:22 -04:00
committed by Lyude Paul
parent 0332078398
commit d6c6a76f80
6 changed files with 42 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
include/drm/drm_dp_mst_helper.h
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@@ -554,6 +554,8 @@ struct drm_dp_mst_topology_state {
struct drm_private_state base;
struct list_head vcpis;
struct drm_dp_mst_topology_mgr *mgr;
u8 total_avail_slots;
u8 start_slot;
};
#define to_dp_mst_topology_mgr(x) container_of(x, struct drm_dp_mst_topology_mgr, base)
@@ -806,6 +808,7 @@ int drm_dp_mst_get_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp
void drm_dp_mst_reset_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port);
void drm_dp_mst_update_slots(struct drm_dp_mst_topology_state *mst_state, uint8_t link_encoding_cap);
void drm_dp_mst_deallocate_vcpi(struct drm_dp_mst_topology_mgr *mgr,
struct drm_dp_mst_port *port);
@@ -815,7 +818,7 @@ int drm_dp_find_vcpi_slots(struct drm_dp_mst_topology_mgr *mgr,
int pbn);
int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr);
int drm_dp_update_payload_part1(struct drm_dp_mst_topology_mgr *mgr, int start_slot);
int drm_dp_update_payload_part2(struct drm_dp_mst_topology_mgr *mgr);