On Wed, Dec 11, 2019 at 10:45:22AM -0800, José Roberto de Souza wrote:
> On TGL the blending of all the streams have moved from DDI to
> transcoder, so now every transcoder working over the same MST port must
> send its stream to a master transcoder and master will send to DDI
> respecting the time slots.
>
> So here adding all the CRTCs that shares the same MST stream if
> needed and computing their state again, it will pick the lowest
> pipe/transcoder among the ones in the same stream to be master.
>
> Most of the time skl_commit_modeset_enables() enables pipes in a
> crescent order but due DDB overlapping it might not happen, this
> scenarios will be handled in the next patch.
>
> v2:
> - Using recently added intel_crtc_state_reset() to set
> mst_master_transcoder to invalid transcoder for all non gen12 & MST
> code paths
> - Setting lowest pipe/transcoder as master, previously it was the
> first one but setting a predictable one will help in future MST e
> port sync integration
> - Moving to intel type as much as we can
>
> BSpec: 50493
> BSpec: 49190
> Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
> Cc: Lucas De Marchi <lucas.demar...@intel.com>
> Signed-off-by: José Roberto de Souza <jose.so...@intel.com>
> ---
> drivers/gpu/drm/i915/display/intel_atomic.c | 14 ++
> drivers/gpu/drm/i915/display/intel_atomic.h | 3 +
> drivers/gpu/drm/i915/display/intel_ddi.c | 14 +-
> drivers/gpu/drm/i915/display/intel_display.c | 13 +-
> .../drm/i915/display/intel_display_types.h | 3 +
> drivers/gpu/drm/i915/display/intel_dp_mst.c | 139 ++++++++++++++++--
> drivers/gpu/drm/i915/display/intel_dp_mst.h | 5 +
> 7 files changed, 178 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_atomic.c
> b/drivers/gpu/drm/i915/display/intel_atomic.c
> index 6e93a39a6fec..69a0430c4638 100644
> --- a/drivers/gpu/drm/i915/display/intel_atomic.c
> +++ b/drivers/gpu/drm/i915/display/intel_atomic.c
> @@ -206,6 +206,20 @@ intel_digital_connector_needs_modeset(struct
> intel_atomic_state *state,
> (new_crtc &&
> drm_atomic_crtc_needs_modeset(&new_crtc_state->uapi));
> }
>
> +struct intel_digital_connector_state *
> +intel_atomic_get_digital_connector_state(struct intel_atomic_state *state,
> + struct intel_connector *connector)
> +{
> + struct drm_connector_state *connector_state;
> +
> + connector_state = drm_atomic_get_connector_state(&state->base,
> + &connector->base);
> + if (IS_ERR(connector_state))
> + return ERR_CAST(connector_state);
> +
> + return to_intel_digital_connector_state(connector_state);
> +}
> +
> /**
> * intel_crtc_duplicate_state - duplicate crtc state
> * @crtc: drm crtc
> diff --git a/drivers/gpu/drm/i915/display/intel_atomic.h
> b/drivers/gpu/drm/i915/display/intel_atomic.h
> index ba9cc29a5865..6e8638d83d28 100644
> --- a/drivers/gpu/drm/i915/display/intel_atomic.h
> +++ b/drivers/gpu/drm/i915/display/intel_atomic.h
> @@ -35,6 +35,9 @@ struct drm_connector_state *
> intel_digital_connector_duplicate_state(struct drm_connector *connector);
> bool intel_digital_connector_needs_modeset(struct intel_atomic_state *state,
> struct intel_connector *connector);
> +struct intel_digital_connector_state *
> +intel_atomic_get_digital_connector_state(struct intel_atomic_state *state,
> + struct intel_connector *connector);
>
> struct drm_crtc_state *intel_crtc_duplicate_state(struct drm_crtc *crtc);
> void intel_crtc_destroy_state(struct drm_crtc *crtc,
> diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c
> b/drivers/gpu/drm/i915/display/intel_ddi.c
> index 5b6f32517c75..6ee5230045eb 100644
> --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> @@ -1903,8 +1903,13 @@ intel_ddi_transcoder_func_reg_val_get(const struct
> intel_crtc_state *crtc_state)
> temp |= TRANS_DDI_MODE_SELECT_DP_MST;
> temp |= DDI_PORT_WIDTH(crtc_state->lane_count);
>
> - if (INTEL_GEN(dev_priv) >= 12)
> - temp |=
> TRANS_DDI_MST_TRANSPORT_SELECT(crtc_state->cpu_transcoder);
> + if (INTEL_GEN(dev_priv) >= 12) {
> + enum transcoder master;
> +
> + master = crtc_state->mst_master_transcoder;
> + WARN_ON(master == INVALID_TRANSCODER);
> + temp |= TRANS_DDI_MST_TRANSPORT_SELECT(master);
> + }
> } else {
> temp |= TRANS_DDI_MODE_SELECT_DP_SST;
> temp |= DDI_PORT_WIDTH(crtc_state->lane_count);
> @@ -4377,6 +4382,11 @@ void intel_ddi_get_config(struct intel_encoder
> *encoder,
> pipe_config->output_types |= BIT(INTEL_OUTPUT_DP_MST);
> pipe_config->lane_count =
> ((temp & DDI_PORT_WIDTH_MASK) >> DDI_PORT_WIDTH_SHIFT)
> + 1;
> +
> + if (INTEL_GEN(dev_priv) >= 12)
> + pipe_config->mst_master_transcoder =
> +
> REG_FIELD_GET(TRANS_DDI_MST_TRANSPORT_SELECT_MASK, temp);
> +
> intel_dp_get_m_n(intel_crtc, pipe_config);
> break;
> default:
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c
> b/drivers/gpu/drm/i915/display/intel_display.c
> index 39b00a19d752..1cecce2f54f8 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -46,6 +46,7 @@
> #include "display/intel_crt.h"
> #include "display/intel_ddi.h"
> #include "display/intel_dp.h"
> +#include "display/intel_dp_mst.h"
> #include "display/intel_dsi.h"
> #include "display/intel_dvo.h"
> #include "display/intel_gmbus.h"
> @@ -11663,6 +11664,7 @@ static void intel_crtc_state_reset(struct
> intel_crtc_state *crtc_state,
> crtc_state->hsw_workaround_pipe = INVALID_PIPE;
> crtc_state->output_format = INTEL_OUTPUT_FORMAT_INVALID;
> crtc_state->scaler_state.scaler_id = -1;
> + crtc_state->mst_master_transcoder = INVALID_TRANSCODER;
> }
>
> /* Returns the currently programmed mode of the given encoder. */
> @@ -12510,6 +12512,9 @@ static void intel_dump_pipe_config(const struct
> intel_crtc_state *pipe_config,
> pipe_config->csc_mode, pipe_config->gamma_mode,
> pipe_config->gamma_enable,
> pipe_config->csc_enable);
>
> + DRM_DEBUG_KMS("MST master transcoder: %s\n",
> + transcoder_name(pipe_config->mst_master_transcoder));
> +
> dump_planes:
> if (!state)
> return;
> @@ -12651,6 +12656,7 @@ intel_crtc_prepare_cleared_state(struct
> intel_crtc_state *crtc_state)
> memcpy(saved_state->icl_port_dplls, crtc_state->icl_port_dplls,
> sizeof(saved_state->icl_port_dplls));
> saved_state->crc_enabled = crtc_state->crc_enabled;
> + saved_state->mst_master_transcoder = INVALID_TRANSCODER;
> if (IS_G4X(dev_priv) ||
> IS_VALLEYVIEW(dev_priv) || IS_CHERRYVIEW(dev_priv))
> saved_state->wm = crtc_state->wm;
> @@ -13290,6 +13296,8 @@ intel_pipe_config_compare(const struct
> intel_crtc_state *current_config,
> PIPE_CONF_CHECK_I(dsc.dsc_split);
> PIPE_CONF_CHECK_I(dsc.compressed_bpp);
>
> + PIPE_CONF_CHECK_I(mst_master_transcoder);
> +
> #undef PIPE_CONF_CHECK_X
> #undef PIPE_CONF_CHECK_I
> #undef PIPE_CONF_CHECK_BOOL
> @@ -14374,7 +14382,7 @@ static void intel_commit_modeset_disables(struct
> intel_atomic_state *state)
> u32 handled = 0;
> int i;
>
> - /* Only disable port sync slaves */
> + /* Only disable port sync and MST slaves */
> for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
> new_crtc_state, i) {
> if (!needs_modeset(new_crtc_state))
> @@ -14388,7 +14396,8 @@ static void intel_commit_modeset_disables(struct
> intel_atomic_state *state)
> * slave CRTCs are disabled first and then master CRTC since
> * Slave vblanks are masked till Master Vblanks.
> */
> - if (!is_trans_port_sync_slave(old_crtc_state))
> + if (!is_trans_port_sync_slave(old_crtc_state) &&
> + !intel_dp_mst_is_slave_trans(old_crtc_state))
> continue;
>
> intel_pre_plane_update(state, crtc);
> diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h
> b/drivers/gpu/drm/i915/display/intel_display_types.h
> index 83ea04149b77..630a94892b7b 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_types.h
> +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> @@ -1054,6 +1054,9 @@ struct intel_crtc_state {
>
> /* Bitmask to indicate slaves attached */
> u8 sync_mode_slaves_mask;
> +
> + /* Only valid on TGL+ */
> + enum transcoder mst_master_transcoder;
> };
>
> struct intel_crtc {
> diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c
> b/drivers/gpu/drm/i915/display/intel_dp_mst.c
> index 926e49f449a6..12f5e799d91f 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
> @@ -87,6 +87,49 @@ static int intel_dp_mst_compute_link_config(struct
> intel_encoder *encoder,
> return 0;
> }
>
> +/*
> + * Iterate over all connectors and set mst_master_transcoder to the smallest
> + * transcoder id that shares the same MST connector.
> + */
> +static int
> +intel_dp_mst_master_trans_compute(struct intel_encoder *encoder,
> + struct intel_crtc_state *crtc_state,
> + struct drm_connector_state *connector_state)
> +{
> + struct intel_atomic_state *state =
> to_intel_atomic_state(crtc_state->uapi.state);
> + struct intel_connector *connector =
> to_intel_connector(connector_state->connector);
> + struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> + struct intel_digital_connector_state *iter_connector_state;
> + struct intel_connector *iter_connector;
> + int i;
> +
> + if (INTEL_GEN(dev_priv) < 12)
> + return 0;
> +
> + crtc_state->mst_master_transcoder = I915_MAX_TRANSCODERS;
> +
> + for_each_new_intel_connector_in_state(state, iter_connector,
> + iter_connector_state, i) {
> + struct intel_crtc_state *iter_crtc_state;
> + struct intel_crtc *iter_crtc;
> +
> + if (connector->mst_port != iter_connector->mst_port ||
> + !iter_connector_state->base.crtc)
> + continue;
> +
> + iter_crtc = to_intel_crtc(iter_connector_state->base.crtc);
> + iter_crtc_state = intel_atomic_get_new_crtc_state(state,
> + iter_crtc);
> + if (!iter_crtc_state->uapi.active)
> + continue;
> +
> + if (iter_crtc_state->cpu_transcoder <
> crtc_state->mst_master_transcoder)
> + crtc_state->mst_master_transcoder =
> iter_crtc_state->cpu_transcoder;
> + }
> +
> + return 0;
> +}
This looks like it can be a pure function that returns the
master transcoder.
> +
> static int intel_dp_mst_compute_config(struct intel_encoder *encoder,
> struct intel_crtc_state *pipe_config,
> struct drm_connector_state *conn_state)
> @@ -154,24 +197,88 @@ static int intel_dp_mst_compute_config(struct
> intel_encoder *encoder,
>
> intel_ddi_compute_min_voltage_level(dev_priv, pipe_config);
>
> + ret = intel_dp_mst_master_trans_compute(encoder, pipe_config,
> + conn_state);
> + if (ret)
> + return ret;
> +
> + return 0;
> +}
> +
> +/*
> + * If one of the connectors in a MST stream needs a modeset, mark all CRTCs
> + * that have a connector in the same MST stream as mode changed,
> + * intel_modeset_pipe_config()+intel_crtc_check_fastset() will take to do a
> + * fastset when possible.
> + */
> +static int
> +intel_dp_mst_atomic_master_trans_check(struct intel_connector *connector,
> + struct intel_atomic_state *state)
> +{
> + struct drm_i915_private *dev_priv = to_i915(state->base.dev);
> + struct drm_connector_list_iter connector_list_iter;
> + struct intel_connector *connector_iter;
> +
> + if (INTEL_GEN(dev_priv) < 12)
> + return 0;
> +
> + if (!intel_digital_connector_needs_modeset(state, connector))
> + return 0;
> +
> + drm_connector_list_iter_begin(&dev_priv->drm, &connector_list_iter);
> + for_each_intel_connector_iter(connector_iter, &connector_list_iter) {
> + struct intel_digital_connector_state *connector_iter_state;
> + struct intel_crtc_state *crtc_state;
> + struct intel_crtc *crtc;
> +
> + if (connector_iter->mst_port != connector->mst_port)
> + continue;
Do we need to exclude the connector itself? I guess not really?
> +
> + connector_iter_state =
> + intel_atomic_get_digital_connector_state(state,
> +
> connector_iter);
> + if (IS_ERR(connector_iter_state)) {
> + drm_connector_list_iter_end(&connector_list_iter);
> + return PTR_ERR(connector_iter_state);
> + }
> +
> + if (!connector_iter_state->base.crtc)
> + continue;
> +
> + crtc = to_intel_crtc(connector_iter_state->base.crtc);
> + crtc_state = intel_atomic_get_crtc_state(&state->base, crtc);
> + if (IS_ERR(crtc_state)) {
> + drm_connector_list_iter_end(&connector_list_iter);
> + return PTR_ERR(crtc_state);
> + }
> +
> + crtc_state->uapi.mode_changed = true;
> + }
> + drm_connector_list_iter_end(&connector_list_iter);
> +
> return 0;
> }
>
> static int
> intel_dp_mst_atomic_check(struct drm_connector *connector,
> - struct drm_atomic_state *state)
> + struct drm_atomic_state *_state)
> {
> + struct intel_atomic_state *state = to_intel_atomic_state(_state);
> struct drm_connector_state *new_conn_state =
> - drm_atomic_get_new_connector_state(state, connector);
> + drm_atomic_get_new_connector_state(&state->base, connector);
> struct drm_connector_state *old_conn_state =
> - drm_atomic_get_old_connector_state(state, connector);
> + drm_atomic_get_old_connector_state(&state->base, connector);
> struct intel_connector *intel_connector =
> to_intel_connector(connector);
> struct drm_crtc *new_crtc = new_conn_state->crtc;
> struct drm_dp_mst_topology_mgr *mgr;
> int ret;
>
> - ret = intel_digital_connector_atomic_check(connector, state);
> + ret = intel_digital_connector_atomic_check(connector, &state->base);
> + if (ret)
> + return ret;
> +
> + ret = intel_dp_mst_atomic_master_trans_check(intel_connector, state);
> if (ret)
> return ret;
>
> @@ -182,12 +289,9 @@ intel_dp_mst_atomic_check(struct drm_connector
> *connector,
> * connector
> */
> if (new_crtc) {
> - struct intel_atomic_state *intel_state =
> - to_intel_atomic_state(state);
> struct intel_crtc *intel_crtc = to_intel_crtc(new_crtc);
> struct intel_crtc_state *crtc_state =
> - intel_atomic_get_new_crtc_state(intel_state,
> - intel_crtc);
> + intel_atomic_get_new_crtc_state(state, intel_crtc);
>
> if (!crtc_state ||
> !drm_atomic_crtc_needs_modeset(&crtc_state->uapi) ||
> @@ -196,7 +300,7 @@ intel_dp_mst_atomic_check(struct drm_connector *connector,
> }
>
> mgr = &enc_to_mst(old_conn_state->best_encoder)->primary->dp.mst_mgr;
> - ret = drm_dp_atomic_release_vcpi_slots(state, mgr,
> + ret = drm_dp_atomic_release_vcpi_slots(&state->base, mgr,
> intel_connector->port);
>
> return ret;
> @@ -241,6 +345,9 @@ static void intel_mst_post_disable_dp(struct
> intel_encoder *encoder,
> intel_dp->active_mst_links--;
> last_mst_stream = intel_dp->active_mst_links == 0;
>
> + WARN_ON(INTEL_GEN(dev_priv) >= 12 && last_mst_stream &&
> + !intel_dp_mst_is_master_trans(old_crtc_state));
> +
> /*
> * From TGL spec: "If multi-stream slave transcoder: Configure
> * Transcoder Clock Select to direct no clock to the transcoder"
> @@ -321,6 +428,9 @@ static void intel_mst_pre_enable_dp(struct intel_encoder
> *encoder,
> intel_mst->connector = connector;
> first_mst_stream = intel_dp->active_mst_links == 0;
>
> + WARN_ON(INTEL_GEN(dev_priv) >= 12 && first_mst_stream &&
> + !intel_dp_mst_is_master_trans(pipe_config));
> +
> DRM_DEBUG_KMS("active links %d\n", intel_dp->active_mst_links);
>
> if (first_mst_stream)
> @@ -726,3 +836,14 @@ intel_dp_mst_encoder_cleanup(struct intel_digital_port
> *intel_dig_port)
> drm_dp_mst_topology_mgr_destroy(&intel_dp->mst_mgr);
> /* encoders will get killed by normal cleanup */
> }
> +
> +bool intel_dp_mst_is_master_trans(const struct intel_crtc_state *crtc_state)
> +{
> + return crtc_state->mst_master_transcoder == crtc_state->cpu_transcoder;
> +}
> +
> +bool intel_dp_mst_is_slave_trans(const struct intel_crtc_state *crtc_state)
> +{
> + return crtc_state->mst_master_transcoder != INVALID_TRANSCODER &&
> + crtc_state->mst_master_transcoder != crtc_state->cpu_transcoder;
> +}
> diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.h
> b/drivers/gpu/drm/i915/display/intel_dp_mst.h
> index f660ad80db04..e40767f78343 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp_mst.h
> +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.h
> @@ -6,10 +6,15 @@
> #ifndef __INTEL_DP_MST_H__
> #define __INTEL_DP_MST_H__
>
> +#include <stdbool.h>
That doesn't seem like something you want to include in kernel code.
> +
> struct intel_digital_port;
> +struct intel_crtc_state;
>
> int intel_dp_mst_encoder_init(struct intel_digital_port *intel_dig_port, int
> conn_id);
> void intel_dp_mst_encoder_cleanup(struct intel_digital_port *intel_dig_port);
> int intel_dp_mst_encoder_active_links(struct intel_digital_port
> *intel_dig_port);
> +bool intel_dp_mst_is_master_trans(const struct intel_crtc_state *crtc_state);
> +bool intel_dp_mst_is_slave_trans(const struct intel_crtc_state *crtc_state);
>
> #endif /* __INTEL_DP_MST_H__ */
> --
> 2.24.1
--
Ville Syrjälä
Intel
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