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drm: add dp helper to initialize remote aux channel. 

[why]
We need to minimally initialize the remote aux channel, e.g. the
crc work struct of remote aux to dump the sink's DPRX CRCs in MST
setup.

[how]
Add helper that only initializes the crc work struct of the remote
aux, hooke crc work queue to 'drm_dp_aux_crc_work'. Then call this
helper in DP MST port initialization.
This, plus David Francis' patch [1], fix the issue of MST remote
aux DPCD CRCs read.

[1] https://patchwork.kernel.org/patch/11217941/

Cc: Leo Li <sunpeng.li@amd.com>
Cc: Harry Wentland <Harry.Wentland@amd.com>
Signed-off-by: David (Dingchen) Zhang <dingchen.zhang@amd.com>
Reviewed-by: Harry Wentland <harry.wentland@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
David (Dingchen) Zhang 2019-12-06 17:56:37 -05:00 committed by Alex Deucher
parent 44be939ff7
commit c908b1c4bb
3 changed files with 17 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/gpu/drm/drm_dp_helper.c
View File

@ -978,6 +978,19 @@ static void drm_dp_aux_crc_work(struct work_struct *work)
}
}
/**
* drm_dp_remote_aux_init() - minimally initialise a remote aux channel
* @aux: DisplayPort AUX channel
*
* Used for remote aux channel in general. Merely initialize the crc work
* struct.
*/
void drm_dp_remote_aux_init(struct drm_dp_aux *aux)
{
INIT_WORK(&aux->crc_work, drm_dp_aux_crc_work);
}
EXPORT_SYMBOL(drm_dp_remote_aux_init);
/**
* drm_dp_aux_init() - minimally initialise an aux channel
* @aux: DisplayPort AUX channel

3
drivers/gpu/drm/drm_dp_mst_topology.c
View File

@ -2200,6 +2200,9 @@ drm_dp_mst_add_port(struct drm_device *dev,
port->aux.dev = dev->dev;
port->aux.is_remote = true;
/* initialize the MST downstream port's AUX crc work queue */
drm_dp_remote_aux_init(&port->aux);
/*
* Make sure the memory allocation for our parent branch stays
* around until our own memory allocation is released

1
include/drm/drm_dp_helper.h
View File

@ -1465,6 +1465,7 @@ int drm_dp_downstream_id(struct drm_dp_aux *aux, char id[6]);
void drm_dp_downstream_debug(struct seq_file *m, const u8 dpcd[DP_RECEIVER_CAP_SIZE],
const u8 port_cap[4], struct drm_dp_aux *aux);
void drm_dp_remote_aux_init(struct drm_dp_aux *aux);
void drm_dp_aux_init(struct drm_dp_aux *aux);
int drm_dp_aux_register(struct drm_dp_aux *aux);
void drm_dp_aux_unregister(struct drm_dp_aux *aux);