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drm/mst: Support simultaneous down replies

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Currently we have one down reply message servicing the mst manager, so
we need to serialize all tx msgs to ensure we only have one message in
flight at a time. For obvious reasons this is suboptimal (but less
suboptimal than the free-for-all we had before serialization).

This patch removes the single down_rep_recv message from manager and
adds 2 replies in the branch structure. The 2 replies mirrors the tx_slots
which we use to rate-limit outgoing messages and correspond to seqno in
the packet headers.

Cc: Wayne Lin <Wayne.Lin@amd.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Wayne Lin <waynelin@amd.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20200213211523.156998-3-sean@poorly.run
This commit is contained in:
Sean Paul
2020-02-13 16:15:19 -05:00
parent 21a729d007
commit fbc821c4a5
2 changed files with 78 additions and 61 deletions
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59
include/drm/drm_dp_mst_helper.h
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@@ -160,6 +160,31 @@ struct drm_dp_mst_port {
bool fec_capable;
};
/* sideband msg header - not bit struct */
struct drm_dp_sideband_msg_hdr {
u8 lct;
u8 lcr;
u8 rad[8];
bool broadcast;
bool path_msg;
u8 msg_len;
bool somt;
bool eomt;
bool seqno;
};
struct drm_dp_sideband_msg_rx {
u8 chunk[48];
u8 msg[256];
u8 curchunk_len;
u8 curchunk_idx; /* chunk we are parsing now */
u8 curchunk_hdrlen;
u8 curlen; /* total length of the msg */
bool have_somt;
bool have_eomt;
struct drm_dp_sideband_msg_hdr initial_hdr;
};
/**
* struct drm_dp_mst_branch - MST branch device.
* @rad: Relative Address to talk to this branch device.
@@ -232,24 +257,16 @@ struct drm_dp_mst_branch {
int last_seqno;
bool link_address_sent;
/**
* @down_rep_recv: Message receiver state for down replies.
*/
struct drm_dp_sideband_msg_rx down_rep_recv[2];
/* global unique identifier to identify branch devices */
u8 guid[16];
};
/* sideband msg header - not bit struct */
struct drm_dp_sideband_msg_hdr {
u8 lct;
u8 lcr;
u8 rad[8];
bool broadcast;
bool path_msg;
u8 msg_len;
bool somt;
bool eomt;
bool seqno;
};
struct drm_dp_nak_reply {
u8 guid[16];
u8 reason;
@@ -306,18 +323,6 @@ struct drm_dp_remote_i2c_write_ack_reply {
};
struct drm_dp_sideband_msg_rx {
u8 chunk[48];
u8 msg[256];
u8 curchunk_len;
u8 curchunk_idx; /* chunk we are parsing now */
u8 curchunk_hdrlen;
u8 curlen; /* total length of the msg */
bool have_somt;
bool have_eomt;
struct drm_dp_sideband_msg_hdr initial_hdr;
};
#define DRM_DP_MAX_SDP_STREAMS 16
struct drm_dp_allocate_payload {
u8 port_number;
@@ -555,10 +560,6 @@ struct drm_dp_mst_topology_mgr {
*/
int conn_base_id;
/**
* @down_rep_recv: Message receiver state for down replies.
*/
struct drm_dp_sideband_msg_rx down_rep_recv;
/**
* @up_req_recv: Message receiver state for up requests.
*/