[PATCH 01/13] drm/amd/display: Add MST atomic routines
Kazlauskas, Nicholas
Nicholas.Kazlauskas at amd.com
Thu Oct 31 13:16:24 UTC 2019
On 2019-10-30 3:24 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.
>
> v6:
> - Remove new param from stream
>
> v7:
> - Fix error with using max capable bpc
>
> 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>
Reviewed-by: Nicholas Kazlauskas <nicholas.kazlauskas at amd.com>
You might want to verify that this still works as you expect when
changing "max bpc" on an MST display.
My understanding is that it'd still force a new modeset before encoder
atomic check is called so you *should* have the correct bpc value during
MST calculations.
> ---
> .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 65 ++++++++++++++++++-
> .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h | 2 +
> .../amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 51 ++++-----------
> .../display/amdgpu_dm/amdgpu_dm_mst_types.c | 32 +++++++++
> 4 files changed, 109 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..d75726013436 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -4180,7 +4180,8 @@ 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 +4210,8 @@ 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;
> }
>
> @@ -4606,10 +4608,64 @@ static void dm_encoder_helper_disable(struct drm_encoder *encoder)
>
> }
>
> +static int convert_dc_color_depth_into_bpc (enum dc_color_depth display_color_depth)
> +{
> + switch (display_color_depth) {
> + case COLOR_DEPTH_666:
> + return 6;
> + case COLOR_DEPTH_888:
> + return 8;
> + case COLOR_DEPTH_101010:
> + return 10;
> + case COLOR_DEPTH_121212:
> + return 12;
> + case COLOR_DEPTH_141414:
> + return 14;
> + case COLOR_DEPTH_161616:
> + return 16;
> + default:
> + break;
> + }
> + return 0;
> +}
> +
> 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;
> + enum dc_color_depth color_depth;
> + 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) {
> + color_depth = convert_color_depth_from_display_info(connector, conn_state);
> + bpp = convert_dc_color_depth_into_bpc(color_depth) * 3;
Minor nitpick here - this is converting from a numerical bpc to a DC
enum and then from the DC enum back to a numerical bpc. Almost seems
like we should just have a helper to get the numerical bpc.
Logic seems fine though.
> + 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", (int)dm_new_connector_state->vcpi_slots);
> + return dm_new_connector_state->vcpi_slots;
> + }
> return 0;
> }
>
> @@ -7651,6 +7707,11 @@ 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..1b2cc85b4815 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 +182,20 @@ bool dm_helpers_dp_mst_write_payload_allocation_table(
> bool enable)
> {
> struct amdgpu_dm_connector *aconnector;
> + struct drm_connector *connector;
> + 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;
> + /* Accessing the connector state is required for vcpi_slots allocation
> + * and directly relies on behaviour in commit check
> + * that blocks before commit guaranteeing that the state
> + * is not gonna be swapped while still in use in commit tail */
> +
> + dm_conn_state = to_dm_connector_state(aconnector->base.state);
> +
>
> if (!aconnector || !aconnector->mst_port)
> return false;
> @@ -203,42 +208,10 @@ 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)
>
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