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drm/dp_mst: Add new quirk for Synaptics MST hubs

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Synaptics DP1.4 hubs (BRANCH_ID 0x90CC24) do not
support virtual DPCD registers, but do support DSC.
The DSC caps can be read from the physical aux,
like in SST DSC. These hubs have many different
DEVICE_IDs.  Add a new quirk to detect this case.

v2: Fix error when checking return of drm_dp_read_desc

Reviewed-by: Wenjing Liu <Wenjing.Liu@amd.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Signed-off-by: David Francis <David.Francis@amd.com>
Signed-off-by: Mikita Lipski <mikita.lipski@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Mikita Lipski 2019-09-20 15:44:56 -04:00 committed by Alex Deucher
parent c2bc1b6eab
commit 5b03f9d868
3 changed files with 36 additions and 0 deletions
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2
drivers/gpu/drm/drm_dp_helper.c
View File

@ -1165,6 +1165,8 @@ static const struct dpcd_quirk dpcd_quirk_list[] = {
{ OUI(0x00, 0x10, 0xfa), DEVICE_ID_ANY, false, BIT(DP_DPCD_QUIRK_NO_PSR) },
/* CH7511 seems to leave SINK_COUNT zeroed */
{ OUI(0x00, 0x00, 0x00), DEVICE_ID('C', 'H', '7', '5', '1', '1'), false, BIT(DP_DPCD_QUIRK_NO_SINK_COUNT) },
/* Synaptics DP1.4 MST hubs can support DSC without virtual DPCD */
{ OUI(0x90, 0xCC, 0x24), DEVICE_ID_ANY, true, BIT(DP_DPCD_QUIRK_DSC_WITHOUT_VIRTUAL_DPCD) },
};
#undef OUI

27
drivers/gpu/drm/drm_dp_mst_topology.c
View File

@ -5148,6 +5148,7 @@ struct drm_dp_aux *drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port)
{
struct drm_dp_mst_port *immediate_upstream_port;
struct drm_dp_mst_port *fec_port;
struct drm_dp_desc desc = { 0 };
u8 endpoint_fec;
u8 endpoint_dsc;
@ -5200,6 +5201,32 @@ struct drm_dp_aux *drm_dp_mst_dsc_aux_for_port(struct drm_dp_mst_port *port)
if (drm_dp_mst_is_virtual_dpcd(port))
return &port->aux;
/*
* Synaptics quirk
* Applies to ports for which:
* - Physical aux has Synaptics OUI
* - DPv1.4 or higher
* - Port is on primary branch device
* - Not a VGA adapter (DP_DWN_STRM_PORT_TYPE_ANALOG)
*/
if (drm_dp_read_desc(port->mgr->aux, &desc, true))
return NULL;
if (drm_dp_has_quirk(&desc, DP_DPCD_QUIRK_DSC_WITHOUT_VIRTUAL_DPCD) &&
port->mgr->dpcd[DP_DPCD_REV] >= DP_DPCD_REV_14 &&
port->parent == port->mgr->mst_primary) {
u8 downstreamport;
if (drm_dp_dpcd_read(&port->aux, DP_DOWNSTREAMPORT_PRESENT,
&downstreamport, 1) < 0)
return NULL;
if ((downstreamport & DP_DWN_STRM_PORT_PRESENT) &&
((downstreamport & DP_DWN_STRM_PORT_TYPE_MASK)
!= DP_DWN_STRM_PORT_TYPE_ANALOG))
return port->mgr->aux;
}
/*
* The check below verifies if the MST sink
* connected to the GPU is capable of DSC -

7
include/drm/drm_dp_helper.h
View File

@ -1522,6 +1522,13 @@ enum drm_dp_quirk {
* The driver should ignore SINK_COUNT during detection.
*/
DP_DPCD_QUIRK_NO_SINK_COUNT,
/**
* @DP_DPCD_QUIRK_DSC_WITHOUT_VIRTUAL_DPCD:
*
* The device supports MST DSC despite not supporting Virtual DPCD.
* The DSC caps can be read from the physical aux instead.
*/
DP_DPCD_QUIRK_DSC_WITHOUT_VIRTUAL_DPCD,
};
/**