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drm/amd/display: implement DSC pass-through support

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Currently, we only attempt to setup DSC at the virtual DPCD port,
however many modern displays come with DSC support and MST hubs can now
support DSC pass-through. So, to more optimally make use of the
available bandwidth, use DSC pass-through when possible by adding DSC
pass-through enablement support into the DSC enable sequence.

Signed-off-by: Hamza Mahfooz <hamza.mahfooz@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Hamza Mahfooz 2022-07-18 16:50:45 -04:00 committed by Alex Deucher
parent 8350bb59e6
commit a4d3230353
1 changed files with 41 additions and 4 deletions
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45
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
View File

@ -729,8 +729,14 @@ bool dm_helpers_dp_write_dsc_enable(
const struct dc_stream_state *stream,
bool enable)
{
uint8_t enable_dsc = enable ? 1 : 0;
static const uint8_t DSC_DISABLE;
static const uint8_t DSC_DECODING = 0x01;
static const uint8_t DSC_PASSTHROUGH = 0x02;
struct amdgpu_dm_connector *aconnector;
struct drm_dp_mst_port *port;
uint8_t enable_dsc = enable ? DSC_DECODING : DSC_DISABLE;
uint8_t enable_passthrough = enable ? DSC_PASSTHROUGH : DSC_DISABLE;
uint8_t ret = 0;
if (!stream)
@ -750,8 +756,39 @@ bool dm_helpers_dp_write_dsc_enable(
aconnector->dsc_aux, stream, enable_dsc);
#endif
ret = drm_dp_dpcd_write(aconnector->dsc_aux, DP_DSC_ENABLE, &enable_dsc, 1);
DC_LOG_DC("Send DSC %s to MST RX\n", enable_dsc ? "enable" : "disable");
port = aconnector->port;
if (enable) {
if (port->passthrough_aux) {
ret = drm_dp_dpcd_write(port->passthrough_aux,
DP_DSC_ENABLE,
&enable_passthrough, 1);
DC_LOG_DC("Sent DSC pass-through enable to virtual dpcd port, ret = %u\n",
ret);
}
ret = drm_dp_dpcd_write(aconnector->dsc_aux,
DP_DSC_ENABLE, &enable_dsc, 1);
DC_LOG_DC("Sent DSC decoding enable to %s port, ret = %u\n",
(port->passthrough_aux) ? "remote RX" :
"virtual dpcd",
ret);
} else {
ret = drm_dp_dpcd_write(aconnector->dsc_aux,
DP_DSC_ENABLE, &enable_dsc, 1);
DC_LOG_DC("Sent DSC decoding disable to %s port, ret = %u\n",
(port->passthrough_aux) ? "remote RX" :
"virtual dpcd",
ret);
if (port->passthrough_aux) {
ret = drm_dp_dpcd_write(port->passthrough_aux,
DP_DSC_ENABLE,
&enable_passthrough, 1);
DC_LOG_DC("Sent DSC pass-through disable to virtual dpcd port, ret = %u\n",
ret);
}
}
}
if (stream->signal == SIGNAL_TYPE_DISPLAY_PORT || stream->signal == SIGNAL_TYPE_EDP) {
@ -768,7 +805,7 @@ bool dm_helpers_dp_write_dsc_enable(
#endif
}
return (ret > 0);
return ret;
}
bool dm_helpers_is_dp_sink_present(struct dc_link *link)