[PATCH v5] drm/amd/display: Add MST atomic routines
Mikita Lipski
mlipski at amd.com
Fri Oct 25 13:36:49 UTC 2019
On 25.10.2019 8:06, Kazlauskas, Nicholas wrote:
> On 2019-10-24 5:06 p.m., mikita.lipski at amd.com wrote:
>> From: Mikita Lipski <mikita.lipski at amd.com>
>>
>> - Adding encoder atomic check to find vcpi slots for a connector
>> - Using DRM helper functions to calculate PBN
>> - Adding connector atomic check to release vcpi slots if connector
>> loses CRTC
>> - Calculate PBN and VCPI slots only once during atomic
>> check and store them on crtc_state to eliminate
>> redundant calculation
>> - Call drm_dp_mst_atomic_check to verify validity of MST topology
>> during state atomic check
>>
>> v2: squashed previous 3 separate patches, removed DSC PBN calculation,
>> and added PBN and VCPI slots properties to amdgpu connector
>>
>> v3:
>> - moved vcpi_slots and pbn properties to dm_crtc_state and dc_stream_state
>> - updates stream's vcpi_slots and pbn on commit
>> - separated patch from the DSC MST series
>>
>> v4:
>> - set vcpi_slots and pbn properties to dm_connector_state
>> - copy porperties from connector state on to crtc state
>>
>> v5:
>> - keep the pbn and vcpi values only on connnector state
>> - added a void pointer to the stream state instead on two ints,
>> because dc_stream_state is OS agnostic. Pointer points to the
>> current dm_connector_state.
>>
>> Cc: Jun Lei <Jun.Lei at amd.com>
>> Cc: Jerry Zuo <Jerry.Zuo at amd.com>
>> Cc: Harry Wentland <harry.wentland at amd.com>
>> Cc: Nicholas Kazlauskas <nicholas.kazlauskas at amd.com>
>> Cc: Lyude Paul <lyude at redhat.com>
>> Signed-off-by: Mikita Lipski <mikita.lipski at amd.com>
> Few comments below, mostly about how you're storing the DRM state in the
> DC stream.
Hi Nick,
Thanks for pointing that out.
It is definitely better not to introduce a new state pointer to the stream.
I'll apply your comments for the next version.
>
>> ---
>> .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 46 ++++++++++++++++++-
>> .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h | 2 +
>> .../amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 44 ++----------------
>> .../display/amdgpu_dm/amdgpu_dm_mst_types.c | 32 +++++++++++++
>> drivers/gpu/drm/amd/display/dc/dc_stream.h | 1 +
>> 5 files changed, 84 insertions(+), 41 deletions(-)
>>
>> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>> index 48f5b43e2698..1d8d7aaba197 100644
>> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
>> @@ -3747,6 +3747,7 @@ create_stream_for_sink(struct amdgpu_dm_connector *aconnector,
>> }
>>
>> stream->dm_stream_context = aconnector;
>> + stream->dm_stream_state = dm_state;
>>
>> stream->timing.flags.LTE_340MCSC_SCRAMBLE =
>> drm_connector->display_info.hdmi.scdc.scrambling.low_rates;
>> @@ -4180,7 +4181,8 @@ void amdgpu_dm_connector_funcs_reset(struct drm_connector *connector)
>> state->underscan_hborder = 0;
>> state->underscan_vborder = 0;
>> state->base.max_requested_bpc = 8;
>> -
>> + state->vcpi_slots = 0;
>> + state->pbn = 0;
>> if (connector->connector_type == DRM_MODE_CONNECTOR_eDP)
>> state->abm_level = amdgpu_dm_abm_level;
>>
>> @@ -4209,7 +4211,8 @@ amdgpu_dm_connector_atomic_duplicate_state(struct drm_connector *connector)
>> new_state->underscan_enable = state->underscan_enable;
>> new_state->underscan_hborder = state->underscan_hborder;
>> new_state->underscan_vborder = state->underscan_vborder;
>> -
>> + new_state->vcpi_slots = state->vcpi_slots;
>> + new_state->pbn = state->pbn;
>> return &new_state->base;
>> }
>>
>> @@ -4610,6 +4613,37 @@ static int dm_encoder_helper_atomic_check(struct drm_encoder *encoder,
>> struct drm_crtc_state *crtc_state,
>> struct drm_connector_state *conn_state)
>> {
>> + struct drm_atomic_state *state = crtc_state->state;
>> + struct drm_connector *connector = conn_state->connector;
>> + struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
>> + struct dm_connector_state *dm_new_connector_state = to_dm_connector_state(conn_state);
>> + const struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode;
>> + struct drm_dp_mst_topology_mgr *mst_mgr;
>> + struct drm_dp_mst_port *mst_port;
>> + int clock, bpp = 0;
>> +
>> + if (!aconnector->port || !aconnector->dc_sink)
>> + return 0;
>> +
>> + mst_port = aconnector->port;
>> + mst_mgr = &aconnector->mst_port->mst_mgr;
>> +
>> + if (!crtc_state->connectors_changed && !crtc_state->mode_changed)
>> + return 0;
>> +
>> + if (!state->duplicated) {
>> + bpp = (uint8_t)connector->display_info.bpc * 3;
>> + clock = adjusted_mode->clock;
>> + dm_new_connector_state->pbn = drm_dp_calc_pbn_mode(clock, bpp);
>> + }
>> + dm_new_connector_state->vcpi_slots = drm_dp_atomic_find_vcpi_slots(state,
>> + mst_mgr,
>> + mst_port,
>> + dm_new_connector_state->pbn);
>> + if (dm_new_connector_state->vcpi_slots < 0) {
>> + DRM_DEBUG_ATOMIC("failed finding vcpi slots: %d\n", dm_new_connector_state->vcpi_slots);
>> + return dm_new_connector_state->vcpi_slots;
>> + }
>> return 0;
>> }
>>
>> @@ -6598,6 +6632,8 @@ static void amdgpu_dm_atomic_commit_tail(struct drm_atomic_state *state)
>> hdr_changed =
>> is_hdr_metadata_different(old_con_state, new_con_state);
>>
>> + dm_new_crtc_state->stream->dm_stream_state = new_con_state;
>> +
>> if (!scaling_changed && !abm_changed && !hdr_changed)
>> continue;
>>
>> @@ -6621,6 +6657,7 @@ static void amdgpu_dm_atomic_commit_tail(struct drm_atomic_state *state)
>> stream_update.hdr_static_metadata = &hdr_packet;
>> }
>>
>> +
>> status = dc_stream_get_status(dm_new_crtc_state->stream);
>> WARN_ON(!status);
>> WARN_ON(!status->plane_count);
>> @@ -7651,6 +7688,11 @@ static int amdgpu_dm_atomic_check(struct drm_device *dev,
>> if (ret)
>> goto fail;
>>
>> + /* Perform validation of MST topology in the state*/
>> + ret = drm_dp_mst_atomic_check(state);
>> + if (ret)
>> + goto fail;
>> +
>> if (state->legacy_cursor_update) {
>> /*
>> * This is a fast cursor update coming from the plane update
>> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
>> index c6fdebee7189..910c8598faf9 100644
>> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
>> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h
>> @@ -360,6 +360,8 @@ struct dm_connector_state {
>> bool freesync_enable;
>> bool freesync_capable;
>> uint8_t abm_level;
>> + uint64_t vcpi_slots;
>> + uint64_t pbn;
>> };
>>
>> #define to_dm_connector_state(x)\
>> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
>> index 11e5784aa62a..821d61e060b2 100644
>> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
>> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_helpers.c
>> @@ -182,15 +182,13 @@ bool dm_helpers_dp_mst_write_payload_allocation_table(
>> bool enable)
>> {
>> struct amdgpu_dm_connector *aconnector;
>> + struct dm_connector_state *dm_conn_state;
>> struct drm_dp_mst_topology_mgr *mst_mgr;
>> struct drm_dp_mst_port *mst_port;
>> - int slots = 0;
>> bool ret;
>> - int clock;
>> - int bpp = 0;
>> - int pbn = 0;
>>
>> aconnector = (struct amdgpu_dm_connector *)stream->dm_stream_context;
>> + dm_conn_state = (struct dm_connector_state *)stream->dm_stream_state;
>>
>> if (!aconnector || !aconnector->mst_port)
>> return false;
>> @@ -203,42 +201,10 @@ bool dm_helpers_dp_mst_write_payload_allocation_table(
>> mst_port = aconnector->port;
>>
>> if (enable) {
>> - clock = stream->timing.pix_clk_100hz / 10;
>> -
>> - switch (stream->timing.display_color_depth) {
>> -
>> - case COLOR_DEPTH_666:
>> - bpp = 6;
>> - break;
>> - case COLOR_DEPTH_888:
>> - bpp = 8;
>> - break;
>> - case COLOR_DEPTH_101010:
>> - bpp = 10;
>> - break;
>> - case COLOR_DEPTH_121212:
>> - bpp = 12;
>> - break;
>> - case COLOR_DEPTH_141414:
>> - bpp = 14;
>> - break;
>> - case COLOR_DEPTH_161616:
>> - bpp = 16;
>> - break;
>> - default:
>> - ASSERT(bpp != 0);
>> - break;
>> - }
>> -
>> - bpp = bpp * 3;
>> -
>> - /* TODO need to know link rate */
>> -
>> - pbn = drm_dp_calc_pbn_mode(clock, bpp);
>> -
>> - slots = drm_dp_find_vcpi_slots(mst_mgr, pbn);
>> - ret = drm_dp_mst_allocate_vcpi(mst_mgr, mst_port, pbn, slots);
>>
>> + ret = drm_dp_mst_allocate_vcpi(mst_mgr, mst_port,
>> + dm_conn_state->pbn,
>> + dm_conn_state->vcpi_slots);
>> if (!ret)
>> return false;
>>
>> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
>> index 779d0b60cac9..1a17ea1b42e0 100644
>> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
>> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
>> @@ -251,10 +251,42 @@ dm_mst_atomic_best_encoder(struct drm_connector *connector,
>> return &to_amdgpu_dm_connector(connector)->mst_encoder->base;
>> }
>>
>> +static int dm_dp_mst_atomic_check(struct drm_connector *connector,
>> + struct drm_atomic_state *state)
>> +{
>> + struct drm_connector_state *new_conn_state =
>> + drm_atomic_get_new_connector_state(state, connector);
>> + struct drm_connector_state *old_conn_state =
>> + drm_atomic_get_old_connector_state(state, connector);
>> + struct amdgpu_dm_connector *aconnector = to_amdgpu_dm_connector(connector);
>> + struct drm_crtc_state *new_crtc_state;
>> + struct drm_dp_mst_topology_mgr *mst_mgr;
>> + struct drm_dp_mst_port *mst_port;
>> +
>> + mst_port = aconnector->port;
>> + mst_mgr = &aconnector->mst_port->mst_mgr;
>> +
>> + if (!old_conn_state->crtc)
>> + return 0;
>> +
>> + if (new_conn_state->crtc) {
>> + new_crtc_state = drm_atomic_get_old_crtc_state(state, new_conn_state->crtc);
>> + if (!new_crtc_state ||
>> + !drm_atomic_crtc_needs_modeset(new_crtc_state) ||
>> + new_crtc_state->enable)
>> + return 0;
>> + }
>> +
>> + return drm_dp_atomic_release_vcpi_slots(state,
>> + mst_mgr,
>> + mst_port);
>> +}
>> +
>> static const struct drm_connector_helper_funcs dm_dp_mst_connector_helper_funcs = {
>> .get_modes = dm_dp_mst_get_modes,
>> .mode_valid = amdgpu_dm_connector_mode_valid,
>> .atomic_best_encoder = dm_mst_atomic_best_encoder,
>> + .atomic_check = dm_dp_mst_atomic_check,
>> };
>>
>> static void amdgpu_dm_encoder_destroy(struct drm_encoder *encoder)
>> diff --git a/drivers/gpu/drm/amd/display/dc/dc_stream.h b/drivers/gpu/drm/amd/display/dc/dc_stream.h
>> index fdb6adc37857..e129717572d3 100644
>> --- a/drivers/gpu/drm/amd/display/dc/dc_stream.h
>> +++ b/drivers/gpu/drm/amd/display/dc/dc_stream.h
>> @@ -193,6 +193,7 @@ struct dc_stream_state {
>> bool dpms_off;
>>
>> void *dm_stream_context;
>> + void *dm_stream_state;
> I don't think you need to be adding this separate field here. The only
> thing stream->dm_stream_context is used for is storing the aconnector
> right now, which already gives you the DRM state.
>
> I don't think it's a really good idea in general to store DRM connector
> state references here directly in a DC object since we're not holding
> any references to the DRM state it comes from (nor should we want to).
>
> The only place I can see where you really use this new field is during
> HPD and you're already holding appropriate locks there, so it should be
> safe to just access the aconnector->base.state directly.
>
> To verify your assumptions you can add an assertion for holding the lock
> in the MST payload allocation helper though.
>
> Nicholas Kazlauskas
>
>>
>> struct dc_cursor_attributes cursor_attributes;
>> struct dc_cursor_position cursor_position;
>>
--
Thanks,
Mikita Lipski
Software Engineer 2, AMD
mikita.lipski at amd.com
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