* [PATCH v1 0/1] drm/dp_mst: Use kHz as link rate units when settig source max link caps at init
@ 2021-05-03 17:21 Nikola Cornij
2021-05-03 17:21 ` [PATCH v1 1/1] " Nikola Cornij
0 siblings, 1 reply; 3+ messages in thread
From: Nikola Cornij @ 2021-05-03 17:21 UTC (permalink / raw)
To: amd-gfx; +Cc: koba.ko, Nikola Cornij
A patch that uses kHz as the link rate units when passing max link rate
to drm_dp_mst_topology_mgr_init() at initialization time.
It should be a 2nd and final follow-up patch to '98025a62cb00
("drm/dp_mst: Use Extended Base Receiver Capability DPCD space")'.
Change history:
v1:
- Initial
Nikola Cornij (1):
drm/dp_mst: Use kHz as link rate units when settig source max link
caps at init
.../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c | 4 ++--
drivers/gpu/drm/drm_dp_mst_topology.c | 8 ++++----
drivers/gpu/drm/i915/display/intel_dp_mst.c | 4 ++--
drivers/gpu/drm/nouveau/dispnv50/disp.c | 5 +++--
drivers/gpu/drm/radeon/radeon_dp_mst.c | 2 +-
include/drm/drm_dp_mst_helper.h | 8 ++++----
6 files changed, 16 insertions(+), 15 deletions(-)
--
2.25.1
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^ permalink raw reply [flat|nested] 3+ messages in thread* [PATCH v1 1/1] drm/dp_mst: Use kHz as link rate units when settig source max link caps at init 2021-05-03 17:21 [PATCH v1 0/1] drm/dp_mst: Use kHz as link rate units when settig source max link caps at init Nikola Cornij @ 2021-05-03 17:21 ` Nikola Cornij 2021-05-03 17:29 ` Jani Nikula 0 siblings, 1 reply; 3+ messages in thread From: Nikola Cornij @ 2021-05-03 17:21 UTC (permalink / raw) To: amd-gfx Cc: David Airlie, Ramalingam C, Imre Deak, Joonas Lahtinen, dri-devel, Meenakshikumar Somasundaram, Aurabindo Pillai, Ville Syrjälä, James Jones, Rodrigo Siqueira, koba.ko, Luben Tuikov, Ben Skeggs, nouveau, Dave Airlie, Harry Wentland, Daniel Vetter, Leo Li, Lucas De Marchi, intel-gfx, Maarten Lankhorst, Maxime Ripard, Nikola Cornij, Sean Paul, Jani Nikula, Rodrigo Vivi, Mikita Lipski, Matt Roper, Chris Park, Eryk Brol, linux-kernel, Thomas Zimmermann, Wayne Lin, Alex Deucher, Lee Shawn C, Christian König [why] Link rate in kHz is what is eventually required to calculate the link bandwidth, which makes kHz a more generic unit. This should also make forward-compatibility with new DP standards easier. [how] - Replace 'link rate DPCD code' with 'link rate in kHz' when used with drm_dp_mst_topology_mgr_init() - Add/remove related DPCD code conversion from/to kHz where applicable Signed-off-by: Nikola Cornij <nikola.cornij@amd.com> --- .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c | 4 ++-- drivers/gpu/drm/drm_dp_mst_topology.c | 8 ++++---- drivers/gpu/drm/i915/display/intel_dp_mst.c | 4 ++-- drivers/gpu/drm/nouveau/dispnv50/disp.c | 5 +++-- drivers/gpu/drm/radeon/radeon_dp_mst.c | 2 +- include/drm/drm_dp_mst_helper.h | 8 ++++---- 6 files changed, 16 insertions(+), 15 deletions(-) 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 ef8d53e24c47..3f3ead83c21c 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 @@ -453,8 +453,8 @@ void amdgpu_dm_initialize_dp_connector(struct amdgpu_display_manager *dm, &aconnector->dm_dp_aux.aux, 16, 4, - (u8)max_link_enc_cap.lane_count, - (u8)max_link_enc_cap.link_rate, + max_link_enc_cap.lane_count, + drm_dp_bw_code_to_link_rate(max_link_enc_cap.link_rate), aconnector->connector_id); drm_connector_attach_dp_subconnector_property(&aconnector->base); diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index 54604633e65c..32b7f8983b94 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -3722,9 +3722,9 @@ int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool ms } lane_count = min_t(int, mgr->dpcd[2] & DP_MAX_LANE_COUNT_MASK, mgr->max_lane_count); - link_rate = min_t(int, mgr->dpcd[1], mgr->max_link_rate); + link_rate = min_t(int, drm_dp_bw_code_to_link_rate(mgr->dpcd[1]), mgr->max_link_rate); mgr->pbn_div = drm_dp_get_vc_payload_bw(mgr, - drm_dp_bw_code_to_link_rate(link_rate), + link_rate, lane_count); if (mgr->pbn_div == 0) { ret = -EINVAL; @@ -5454,7 +5454,7 @@ EXPORT_SYMBOL(drm_atomic_get_mst_topology_state); * @max_dpcd_transaction_bytes: hw specific DPCD transaction limit * @max_payloads: maximum number of payloads this GPU can source * @max_lane_count: maximum number of lanes this GPU supports - * @max_link_rate: maximum link rate this GPU supports, units as in DPCD + * @max_link_rate: maximum link rate per lane this GPU supports in kHz * @conn_base_id: the connector object ID the MST device is connected to. * * Return 0 for success, or negative error code on failure @@ -5462,7 +5462,7 @@ EXPORT_SYMBOL(drm_atomic_get_mst_topology_state); int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, struct drm_device *dev, struct drm_dp_aux *aux, int max_dpcd_transaction_bytes, int max_payloads, - u8 max_lane_count, u8 max_link_rate, + int max_lane_count, int max_link_rate, int conn_base_id) { struct drm_dp_mst_topology_state *mst_state; diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c index f608c0cb98f4..26f65445bc8a 100644 --- a/drivers/gpu/drm/i915/display/intel_dp_mst.c +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c @@ -960,8 +960,8 @@ intel_dp_mst_encoder_init(struct intel_digital_port *dig_port, int conn_base_id) intel_dp_create_fake_mst_encoders(dig_port); ret = drm_dp_mst_topology_mgr_init(&intel_dp->mst_mgr, &i915->drm, &intel_dp->aux, 16, 3, - (u8)dig_port->max_lanes, - drm_dp_link_rate_to_bw_code(max_source_rate), + dig_port->max_lanes, + max_source_rate, conn_base_id); if (ret) return ret; diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c index c46d0374b6e6..f949767698fc 100644 --- a/drivers/gpu/drm/nouveau/dispnv50/disp.c +++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c @@ -1617,8 +1617,9 @@ nv50_mstm_new(struct nouveau_encoder *outp, struct drm_dp_aux *aux, int aux_max, mstm->mgr.cbs = &nv50_mstm; ret = drm_dp_mst_topology_mgr_init(&mstm->mgr, dev, aux, aux_max, - (u8)max_payloads, outp->dcb->dpconf.link_nr, - (u8)outp->dcb->dpconf.link_bw, conn_base_id); + max_payloads, outp->dcb->dpconf.link_nr, + drm_dp_bw_code_to_link_rate(outp->dcb->dpconf.link_bw), + conn_base_id); if (ret) return ret; diff --git a/drivers/gpu/drm/radeon/radeon_dp_mst.c b/drivers/gpu/drm/radeon/radeon_dp_mst.c index 13072c2a6502..ec867fa880a4 100644 --- a/drivers/gpu/drm/radeon/radeon_dp_mst.c +++ b/drivers/gpu/drm/radeon/radeon_dp_mst.c @@ -642,7 +642,7 @@ radeon_dp_mst_init(struct radeon_connector *radeon_connector) radeon_connector->mst_mgr.cbs = &mst_cbs; return drm_dp_mst_topology_mgr_init(&radeon_connector->mst_mgr, dev, &radeon_connector->ddc_bus->aux, 16, 6, - 4, (u8)max_link_rate, + 4, drm_dp_bw_code_to_link_rate(max_link_rate), radeon_connector->base.base.id); } diff --git a/include/drm/drm_dp_mst_helper.h b/include/drm/drm_dp_mst_helper.h index c87a829b6498..ddb9231d0309 100644 --- a/include/drm/drm_dp_mst_helper.h +++ b/include/drm/drm_dp_mst_helper.h @@ -596,11 +596,11 @@ struct drm_dp_mst_topology_mgr { /** * @max_lane_count: maximum number of lanes the GPU can drive. */ - u8 max_lane_count; + int max_lane_count; /** - * @max_link_rate: maximum link rate per lane GPU can output. + * @max_link_rate: maximum link rate per lane GPU can output, in kHz. */ - u8 max_link_rate; + int max_link_rate; /** * @conn_base_id: DRM connector ID this mgr is connected to. Only used * to build the MST connector path value. @@ -774,7 +774,7 @@ int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, struct drm_device *dev, struct drm_dp_aux *aux, int max_dpcd_transaction_bytes, int max_payloads, - u8 max_lane_count, u8 max_link_rate, + int max_lane_count, int max_link_rate, int conn_base_id); void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr); -- 2.25.1 _______________________________________________ amd-gfx mailing list amd-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/amd-gfx ^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH v1 1/1] drm/dp_mst: Use kHz as link rate units when settig source max link caps at init 2021-05-03 17:21 ` [PATCH v1 1/1] " Nikola Cornij @ 2021-05-03 17:29 ` Jani Nikula 0 siblings, 0 replies; 3+ messages in thread From: Jani Nikula @ 2021-05-03 17:29 UTC (permalink / raw) To: Nikola Cornij, amd-gfx Cc: David Airlie, Ramalingam C, Imre Deak, Joonas Lahtinen, dri-devel, Meenakshikumar Somasundaram, Aurabindo Pillai, Ville Syrjälä, James Jones, Rodrigo Siqueira, koba.ko, Luben Tuikov, Ben Skeggs, nouveau, Dave Airlie, Harry Wentland, Daniel Vetter, Leo Li, Lucas De Marchi, intel-gfx, Maarten Lankhorst, Maxime Ripard, Nikola Cornij, Sean Paul, Rodrigo Vivi, Mikita Lipski, Matt Roper, Chris Park, Eryk Brol, linux-kernel, Thomas Zimmermann, Wayne Lin, Alex Deucher, Lee Shawn C, Christian König On Mon, 03 May 2021, Nikola Cornij <nikola.cornij@amd.com> wrote: > [why] > Link rate in kHz is what is eventually required to calculate the link > bandwidth, which makes kHz a more generic unit. This should also make > forward-compatibility with new DP standards easier. > > [how] > - Replace 'link rate DPCD code' with 'link rate in kHz' when used with > drm_dp_mst_topology_mgr_init() > - Add/remove related DPCD code conversion from/to kHz where applicable > > Signed-off-by: Nikola Cornij <nikola.cornij@amd.com> LGTM, Acked-by: Jani Nikula <jani.nikula@intel.com> for merging via drm-misc-next where the previous patches went. > --- > .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c | 4 ++-- > drivers/gpu/drm/drm_dp_mst_topology.c | 8 ++++---- > drivers/gpu/drm/i915/display/intel_dp_mst.c | 4 ++-- > drivers/gpu/drm/nouveau/dispnv50/disp.c | 5 +++-- > drivers/gpu/drm/radeon/radeon_dp_mst.c | 2 +- > include/drm/drm_dp_mst_helper.h | 8 ++++---- > 6 files changed, 16 insertions(+), 15 deletions(-) > > 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 ef8d53e24c47..3f3ead83c21c 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 > @@ -453,8 +453,8 @@ void amdgpu_dm_initialize_dp_connector(struct amdgpu_display_manager *dm, > &aconnector->dm_dp_aux.aux, > 16, > 4, > - (u8)max_link_enc_cap.lane_count, > - (u8)max_link_enc_cap.link_rate, > + max_link_enc_cap.lane_count, > + drm_dp_bw_code_to_link_rate(max_link_enc_cap.link_rate), > aconnector->connector_id); > > drm_connector_attach_dp_subconnector_property(&aconnector->base); > diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c > index 54604633e65c..32b7f8983b94 100644 > --- a/drivers/gpu/drm/drm_dp_mst_topology.c > +++ b/drivers/gpu/drm/drm_dp_mst_topology.c > @@ -3722,9 +3722,9 @@ int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool ms > } > > lane_count = min_t(int, mgr->dpcd[2] & DP_MAX_LANE_COUNT_MASK, mgr->max_lane_count); > - link_rate = min_t(int, mgr->dpcd[1], mgr->max_link_rate); > + link_rate = min_t(int, drm_dp_bw_code_to_link_rate(mgr->dpcd[1]), mgr->max_link_rate); > mgr->pbn_div = drm_dp_get_vc_payload_bw(mgr, > - drm_dp_bw_code_to_link_rate(link_rate), > + link_rate, > lane_count); > if (mgr->pbn_div == 0) { > ret = -EINVAL; > @@ -5454,7 +5454,7 @@ EXPORT_SYMBOL(drm_atomic_get_mst_topology_state); > * @max_dpcd_transaction_bytes: hw specific DPCD transaction limit > * @max_payloads: maximum number of payloads this GPU can source > * @max_lane_count: maximum number of lanes this GPU supports > - * @max_link_rate: maximum link rate this GPU supports, units as in DPCD > + * @max_link_rate: maximum link rate per lane this GPU supports in kHz > * @conn_base_id: the connector object ID the MST device is connected to. > * > * Return 0 for success, or negative error code on failure > @@ -5462,7 +5462,7 @@ EXPORT_SYMBOL(drm_atomic_get_mst_topology_state); > int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, > struct drm_device *dev, struct drm_dp_aux *aux, > int max_dpcd_transaction_bytes, int max_payloads, > - u8 max_lane_count, u8 max_link_rate, > + int max_lane_count, int max_link_rate, > int conn_base_id) > { > struct drm_dp_mst_topology_state *mst_state; > diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c b/drivers/gpu/drm/i915/display/intel_dp_mst.c > index f608c0cb98f4..26f65445bc8a 100644 > --- a/drivers/gpu/drm/i915/display/intel_dp_mst.c > +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c > @@ -960,8 +960,8 @@ intel_dp_mst_encoder_init(struct intel_digital_port *dig_port, int conn_base_id) > intel_dp_create_fake_mst_encoders(dig_port); > ret = drm_dp_mst_topology_mgr_init(&intel_dp->mst_mgr, &i915->drm, > &intel_dp->aux, 16, 3, > - (u8)dig_port->max_lanes, > - drm_dp_link_rate_to_bw_code(max_source_rate), > + dig_port->max_lanes, > + max_source_rate, > conn_base_id); > if (ret) > return ret; > diff --git a/drivers/gpu/drm/nouveau/dispnv50/disp.c b/drivers/gpu/drm/nouveau/dispnv50/disp.c > index c46d0374b6e6..f949767698fc 100644 > --- a/drivers/gpu/drm/nouveau/dispnv50/disp.c > +++ b/drivers/gpu/drm/nouveau/dispnv50/disp.c > @@ -1617,8 +1617,9 @@ nv50_mstm_new(struct nouveau_encoder *outp, struct drm_dp_aux *aux, int aux_max, > mstm->mgr.cbs = &nv50_mstm; > > ret = drm_dp_mst_topology_mgr_init(&mstm->mgr, dev, aux, aux_max, > - (u8)max_payloads, outp->dcb->dpconf.link_nr, > - (u8)outp->dcb->dpconf.link_bw, conn_base_id); > + max_payloads, outp->dcb->dpconf.link_nr, > + drm_dp_bw_code_to_link_rate(outp->dcb->dpconf.link_bw), > + conn_base_id); > if (ret) > return ret; > > diff --git a/drivers/gpu/drm/radeon/radeon_dp_mst.c b/drivers/gpu/drm/radeon/radeon_dp_mst.c > index 13072c2a6502..ec867fa880a4 100644 > --- a/drivers/gpu/drm/radeon/radeon_dp_mst.c > +++ b/drivers/gpu/drm/radeon/radeon_dp_mst.c > @@ -642,7 +642,7 @@ radeon_dp_mst_init(struct radeon_connector *radeon_connector) > radeon_connector->mst_mgr.cbs = &mst_cbs; > return drm_dp_mst_topology_mgr_init(&radeon_connector->mst_mgr, dev, > &radeon_connector->ddc_bus->aux, 16, 6, > - 4, (u8)max_link_rate, > + 4, drm_dp_bw_code_to_link_rate(max_link_rate), > radeon_connector->base.base.id); > } > > diff --git a/include/drm/drm_dp_mst_helper.h b/include/drm/drm_dp_mst_helper.h > index c87a829b6498..ddb9231d0309 100644 > --- a/include/drm/drm_dp_mst_helper.h > +++ b/include/drm/drm_dp_mst_helper.h > @@ -596,11 +596,11 @@ struct drm_dp_mst_topology_mgr { > /** > * @max_lane_count: maximum number of lanes the GPU can drive. > */ > - u8 max_lane_count; > + int max_lane_count; > /** > - * @max_link_rate: maximum link rate per lane GPU can output. > + * @max_link_rate: maximum link rate per lane GPU can output, in kHz. > */ > - u8 max_link_rate; > + int max_link_rate; > /** > * @conn_base_id: DRM connector ID this mgr is connected to. Only used > * to build the MST connector path value. > @@ -774,7 +774,7 @@ int drm_dp_mst_topology_mgr_init(struct drm_dp_mst_topology_mgr *mgr, > struct drm_device *dev, struct drm_dp_aux *aux, > int max_dpcd_transaction_bytes, > int max_payloads, > - u8 max_lane_count, u8 max_link_rate, > + int max_lane_count, int max_link_rate, > int conn_base_id); > > void drm_dp_mst_topology_mgr_destroy(struct drm_dp_mst_topology_mgr *mgr); -- Jani Nikula, Intel Open Source Graphics Center _______________________________________________ amd-gfx mailing list amd-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/amd-gfx ^ permalink raw reply [flat|nested] 3+ messages in thread
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