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| author |   Hugo Hu <hugo.hu@amd.com> | 2019-02-25 19:16:52 +0800 |
|---|---|---|
| committer |   Alex Deucher <alexander.deucher@amd.com> | 2019-03-27 22:41:32 -0500 |
| commit | a504ad265dec380d7314b8e02984c8d294ab0bd5 (patch) | |
| tree | 00862914b9452f134581db4928085c2473e8c875 /drivers/gpu/drm/amd/display/dc/core/dc_link.c | |
| parent | drm/amd/display: program default output gamma (diff) | |
| download | linux-dev-a504ad265dec380d7314b8e02984c8d294ab0bd5.tar.xz linux-dev-a504ad265dec380d7314b8e02984c8d294ab0bd5.zip | |
drm/amd/display: Handle branch device with DFP count = 0 case.
[Why]
When you have a SST branch device the driver, Even no sink device connected,
it also send HPD with a valid EDID. Driver will config it to DP sink.
Therefore, there're two displays in display setting.
DPCD 0x05, DFP_PRESENT = 1 (branch device),
DFP_TYPE = 00 (Display Port)
[How]
Driver determine DPCD 0x05 DFP_PRESENT = 1(branch) as an active dongle
And check DFP count.
Signed-off-by: Hugo Hu <hugo.hu@amd.com>
Reviewed-by: Hugo Hu <Hugo.Hu@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/core/dc_link.c')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/core/dc_link.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/core/dc_link.c b/drivers/gpu/drm/amd/display/dc/core/dc_link.c index 5575d1adb9b5..ac128f7a9d85 100644 --- a/drivers/gpu/drm/amd/display/dc/core/dc_link.c +++ b/drivers/gpu/drm/amd/display/dc/core/dc_link.c @@ -720,9 +720,8 @@ bool dc_link_detect(struct dc_link *link, enum dc_detect_reason reason) same_dpcd = false; } /* Active dongle plug in without display or downstream unplug*/ - if (link->type == dc_connection_active_dongle - && link->dpcd_caps.sink_count. - bits.SINK_COUNT == 0) { + if (link->type == dc_connection_active_dongle && + link->dpcd_caps.sink_count.bits.SINK_COUNT == 0) { if (prev_sink != NULL) { /* Downstream unplug */ dc_sink_release(prev_sink); |