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drm/amd/display: add helper for enabling mst stream features

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[Why]
Some MST devices uses different method to enable mst
specific stream features.

[How]
Add dm_helpers_mst_enable_stream features. This can be
modified later when we are ready to implement those features.

Signed-off-by: Bing Guo <bing.guo@amd.com>
Reviewed-by: Anthony Koo <Anthony.Koo@amd.com>
Acked-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Bing Guo 2021-04-05 16:51:24 -04:00 • committed by Alex Deucher
parent fdf7d4f547
commit 6016cd9dba
3 changed files with 44 additions and 11 deletions
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25
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
View file

@ -711,3 +711,28 @@ bool dm_helpers_dmub_outbox0_interrupt_control(struct dc_context *ctx, bool enab
enable ? "en" : "dis", ret); enable ? "en" : "dis", ret);
return ret; return ret;
} }
void dm_helpers_mst_enable_stream_features(const struct dc_stream_state *stream)
{
/* TODO: virtual DPCD */
struct dc_link *link = stream->link;
union down_spread_ctrl old_downspread;
union down_spread_ctrl new_downspread;
if (link->aux_access_disabled)
return;
if (!dm_helpers_dp_read_dpcd(link->ctx, link, DP_DOWNSPREAD_CTRL,
&old_downspread.raw,
sizeof(old_downspread)))
return;
new_downspread.raw = old_downspread.raw;
new_downspread.bits.IGNORE_MSA_TIMING_PARAM =
(stream->ignore_msa_timing_param) ? 1 : 0;
if (new_downspread.raw != old_downspread.raw)
dm_helpers_dp_write_dpcd(link->ctx, link, DP_DOWNSPREAD_CTRL,
&new_downspread.raw,
sizeof(new_downspread));
}

6
drivers/gpu/drm/amd/display/dc/core/dc_link.c
View file

@ -1679,6 +1679,8 @@ void link_destroy(struct dc_link **link)
static void enable_stream_features(struct pipe_ctx *pipe_ctx) static void enable_stream_features(struct pipe_ctx *pipe_ctx)
{ {
struct dc_stream_state *stream = pipe_ctx->stream; struct dc_stream_state *stream = pipe_ctx->stream;
if (pipe_ctx->stream->signal != SIGNAL_TYPE_DISPLAY_PORT_MST) {
struct dc_link *link = stream->link; struct dc_link *link = stream->link;
union down_spread_ctrl old_downspread; union down_spread_ctrl old_downspread;
union down_spread_ctrl new_downspread; union down_spread_ctrl new_downspread;
@ -1695,6 +1697,10 @@ static void enable_stream_features(struct pipe_ctx *pipe_ctx)
core_link_write_dpcd(link, DP_DOWNSPREAD_CTRL, core_link_write_dpcd(link, DP_DOWNSPREAD_CTRL,
&new_downspread.raw, sizeof(new_downspread)); &new_downspread.raw, sizeof(new_downspread));
} }
} else {
dm_helpers_mst_enable_stream_features(stream);
}
} }
static enum dc_status enable_link_dp(struct dc_state *state, static enum dc_status enable_link_dp(struct dc_state *state,

2
drivers/gpu/drm/amd/display/dc/dm_helpers.h
View file

@ -147,6 +147,8 @@ bool dm_helpers_dp_write_dsc_enable(
bool dm_helpers_is_dp_sink_present( bool dm_helpers_is_dp_sink_present(
struct dc_link *link); struct dc_link *link);
void dm_helpers_mst_enable_stream_features(const struct dc_stream_state *stream);
enum dc_edid_status dm_helpers_read_local_edid( enum dc_edid_status dm_helpers_read_local_edid(
struct dc_context *ctx, struct dc_context *ctx,
struct dc_link *link, struct dc_link *link,