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Date: Mon, 03 May 2021 20:29:30 +0300
From: Jani Nikula <jani.nikula@...ux.intel.com>
To: Nikola Cornij <nikola.cornij@....com>,
amd-gfx@...ts.freedesktop.org
Cc: koba.ko@...onical.com, Nikola Cornij <nikola.cornij@....com>,
Harry Wentland <harry.wentland@....com>,
Leo Li <sunpeng.li@....com>,
Alex Deucher <alexander.deucher@....com>,
Christian König <christian.koenig@....com>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
Ben Skeggs <bskeggs@...hat.com>,
Mikita Lipski <mikita.lipski@....com>,
Eryk Brol <eryk.brol@....com>,
Aurabindo Pillai <aurabindo.pillai@....com>,
Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
Luben Tuikov <luben.tuikov@....com>,
Wayne Lin <Wayne.Lin@....com>, Chris Park <Chris.Park@....com>,
Meenakshikumar Somasundaram <meenakshikumar.somasundaram@....com>,
Ville Syrjälä
<ville.syrjala@...ux.intel.com>, Imre Deak <imre.deak@...el.com>,
Lyude Paul <lyude@...hat.com>,
Ramalingam C <ramalingam.c@...el.com>,
Sean Paul <seanpaul@...omium.org>,
Lee Shawn C <shawn.c.lee@...el.com>,
Lucas De Marchi <lucas.demarchi@...el.com>,
Matt Roper <matthew.d.roper@...el.com>,
Dave Airlie <airlied@...hat.com>,
James Jones <jajones@...dia.com>,
dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
intel-gfx@...ts.freedesktop.org, nouveau@...ts.freedesktop.org
Subject: Re: [PATCH v1 1/1] drm/dp_mst: Use kHz as link rate units when settig source max link caps at init
On Mon, 03 May 2021, Nikola Cornij <nikola.cornij@....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@....com>
LGTM,
Acked-by: Jani Nikula <jani.nikula@...el.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
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