[AMD Official Use Only]
Hi Bhawan,
Just a nitpick below. With that fixed, feel free to add:
Reviewed-by: Wayne Lin <wayne....@amd.com>
Thanks!
Regards,
Wayne
> -----Original Message-----
> From: Bhawanpreet Lakha <bhawanpreet.la...@amd.com>
> Sent: Thursday, October 21, 2021 3:47 AM
> To: Zuo, Jerry <jerry....@amd.com>; dri-devel@lists.freedesktop.org;
> ly...@redhat.com
> Cc: Wentland, Harry <harry.wentl...@amd.com>; Lin, Wayne <wayne....@amd.com>;
> Kazlauskas, Nicholas
> <nicholas.kazlaus...@amd.com>; Lipski, Mikita <mikita.lip...@amd.com>;
> intel-...@lists.freedesktop.org; Lakha, Bhawanpreet
> <bhawanpreet.la...@amd.com>
> Subject: [PATCH 4/4] drm/amd/display: Add DP 2.0 MST DM Support
>
> [Why]
> Add DP2 MST and debugfs support
>
> [How]
> Update the slot info based on the link encoding format
>
> Signed-off-by: Bhawanpreet Lakha <bhawanpreet.la...@amd.com>
> Signed-off-by: Fangzhi Zuo <jerry....@amd.com>
> ---
> .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 29 +++++++++++++++++++
> .../amd/display/amdgpu_dm/amdgpu_dm_debugfs.c |
> 3 ++ .../amd/display/amdgpu_dm/amdgpu_dm_helpers.c | 5 +++-
> 3 files changed, 36 insertions(+), 1 deletion(-)
>
> 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 e56f73e299ef..875425ee91d0 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -10741,6 +10741,8 @@ static int amdgpu_dm_atomic_check(struct drm_device
> *dev, #if defined(CONFIG_DRM_AMD_DC_DCN)
> struct dsc_mst_fairness_vars vars[MAX_PIPES]; #endif
> + struct drm_dp_mst_topology_state *mst_state;
> + struct drm_dp_mst_topology_mgr *mgr;
>
> trace_amdgpu_dm_atomic_check_begin(state);
>
> @@ -10948,6 +10950,33 @@ static int amdgpu_dm_atomic_check(struct drm_device
> *dev,
> lock_and_validation_needed = true;
> }
>
> +#if defined(CONFIG_DRM_AMD_DC_DCN)
> + /* set the slot info for each mst_state based on the link encoding
> format */
> + for_each_new_mst_mgr_in_state(state, mgr, mst_state, i) {
> + struct amdgpu_dm_connector *aconnector;
> + struct drm_connector *connector;
> + struct drm_connector_list_iter iter;
> + u8 link_coding_cap;
> +
> + if (!mgr->mst_state )
> + continue;
> +
> + drm_connector_list_iter_begin(dev, &iter);
> + drm_for_each_connector_iter(connector, &iter) {
> + int id = connector->index;
> +
> + if (id == mst_state->mgr->conn_base_id) {
> + aconnector = to_amdgpu_dm_connector(connector);
> + link_coding_cap =
> dc_link_dp_mst_decide_link_encoding_format(aconnector->dc_link);
> + drm_dp_mst_update_slots(mst_state,
> link_coding_cap);
> +
> + break;
> + }
> + }
> + drm_connector_list_iter_end(&iter);
> +
> + }
> +#endif
> /**
> * Streams and planes are reset when there are changes that affect
> * bandwidth. Anything that affects bandwidth needs to go through diff
> --git
> a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
> b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
> index 9b3ad56607bb..1a68a674913c 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
> @@ -294,6 +294,9 @@ static ssize_t dp_link_settings_write(struct file *f,
> const char __user *buf,
> case LINK_RATE_RBR2:
> case LINK_RATE_HIGH2:
> case LINK_RATE_HIGH3:
> +#if defined(CONFIG_DRM_AMD_DC_DCN)
> + case LINK_RATE_UHBR10:
> +#endif
> break;
> default:
> valid_input = false;
> 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 6169488e2011..53b5cc7b0679 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
> @@ -219,6 +219,7 @@ bool dm_helpers_dp_mst_write_payload_allocation_table(
> struct drm_dp_mst_topology_mgr *mst_mgr;
> struct drm_dp_mst_port *mst_port;
> bool ret;
> + u8 link_coding_cap;
>
> aconnector = (struct amdgpu_dm_connector *)stream->dm_stream_context;
> /* Accessing the connector state is required for vcpi_slots allocation
> @@ -238,6 +239,8 @@ bool
> dm_helpers_dp_mst_write_payload_allocation_table(
>
> mst_port = aconnector->port;
>
> + link_coding_cap =
> +dc_link_dp_mst_decide_link_encoding_format(aconnector->dc_link);
> +
> if (enable) {
>
> ret = drm_dp_mst_allocate_vcpi(mst_mgr, mst_port, @@ -251,7
> +254,7 @@ bool
> dm_helpers_dp_mst_write_payload_allocation_table(
> }
>
> /* It's OK for this to fail */
> - drm_dp_update_payload_part1(mst_mgr, 1);
> + drm_dp_update_payload_part1(mst_mgr, (link_coding_cap ==
> +DP_CAP_ANSI_128B132B) ? 0:1);
I think should have format warning here that we need space between the number
and the colon .
i.e. should be "0 : 1"
>
> /* mst_mgr->->payloads are VC payload notify MST branch using DPCD or
> * AUX message. The sequence is slot 1-63 allocated sequence for each
> --
> 2.25.1
