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Date: Wed, 21 Apr 2021 10:23:25 -0400
From: Mikita Lipski <mlipski@....com>
To: Lyude Paul <lyude@...hat.com>, dri-devel@...ts.freedesktop.org,
intel-gfx@...ts.freedesktop.org, nouveau@...ts.freedesktop.org,
amd-gfx@...ts.freedesktop.org,
Ville Syrjälä <ville.syrjala@...ux.intel.com>,
Jani Nikula <jani.nikula@...ux.intel.com>,
Rodrigo Vivi <rodrigo.vivi@...el.com>,
Thomas Zimmermann <tzimmermann@...e.de>,
Thierry Reding <thierry.reding@...il.com>
Cc: Stylon Wang <stylon.wang@....com>,
Mikita Lipski <mikita.lipski@....com>,
Chris Park <Chris.Park@....com>, Eryk Brol <eryk.brol@....com>,
Leo Li <sunpeng.li@....com>,
Bhawanpreet Lakha <Bhawanpreet.Lakha@....com>,
Wayne Lin <Wayne.Lin@....com>,
Rodrigo Siqueira <Rodrigo.Siqueira@....com>,
open list <linux-kernel@...r.kernel.org>,
Nicholas Kazlauskas <nicholas.kazlauskas@....com>,
Meenakshikumar Somasundaram <meenakshikumar.somasundaram@....com>,
David Airlie <airlied@...ux.ie>,
Aurabindo Pillai <aurabindo.pillai@....com>,
Daniel Vetter <daniel@...ll.ch>,
Bas Nieuwenhuizen <bas@...nieuwenhuizen.nl>,
Alex Deucher <alexander.deucher@....com>,
Nikola Cornij <nikola.cornij@....com>,
Harry Wentland <harry.wentland@....com>,
Christian König <christian.koenig@....com>
Subject: Re: [PATCH v3 01/20] drm/amdgpu: Add error handling to
amdgpu_dm_initialize_dp_connector()
Thanks for the change!
Reviewed-by: Mikita Lipski <Mikita.Lipski@....com>
On 2021-04-19 6:55 p.m., Lyude Paul wrote:
> While working on moving i2c device registration into drm_dp_aux_init() - I
> realized that in order to do so we need to make sure that drivers calling
> drm_dp_aux_init() handle any errors it could possibly return. In the
> process of doing that, I noticed that the majority of AMD's code for DP
> connector creation doesn't attempt to do any real error handling.
>
> So, let's fix this and also cleanup amdgpu_dm_initialize_dp_connector()
> while we're at it. This way we can handle the error codes from
> drm_dp_aux_init().
>
> Signed-off-by: Lyude Paul <lyude@...hat.com>
> ---
> .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 29 +++++++-----
> .../display/amdgpu_dm/amdgpu_dm_mst_types.c | 44 +++++++++++--------
> .../display/amdgpu_dm/amdgpu_dm_mst_types.h | 6 +--
> 3 files changed, 45 insertions(+), 34 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 a0c8c41e4e57..fc5d315bbb05 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
> @@ -7608,10 +7608,9 @@ static int amdgpu_dm_connector_init(struct amdgpu_display_manager *dm,
>
> aconnector->i2c = i2c;
> res = i2c_add_adapter(&i2c->base);
> -
> if (res) {
> DRM_ERROR("Failed to register hw i2c %d\n", link->link_index);
> - goto out_free;
> + goto fail_free;
> }
>
> connector_type = to_drm_connector_type(link->connector_signal);
> @@ -7625,8 +7624,7 @@ static int amdgpu_dm_connector_init(struct amdgpu_display_manager *dm,
>
> if (res) {
> DRM_ERROR("connector_init failed\n");
> - aconnector->connector_id = -1;
> - goto out_free;
> + goto fail_id;
> }
>
> drm_connector_helper_add(
> @@ -7643,15 +7641,22 @@ static int amdgpu_dm_connector_init(struct amdgpu_display_manager *dm,
> drm_connector_attach_encoder(
> &aconnector->base, &aencoder->base);
>
> - if (connector_type == DRM_MODE_CONNECTOR_DisplayPort
> - || connector_type == DRM_MODE_CONNECTOR_eDP)
> - amdgpu_dm_initialize_dp_connector(dm, aconnector, link->link_index);
> -
> -out_free:
> - if (res) {
> - kfree(i2c);
> - aconnector->i2c = NULL;
> + if (connector_type == DRM_MODE_CONNECTOR_DisplayPort ||
> + connector_type == DRM_MODE_CONNECTOR_eDP) {
> + res = amdgpu_dm_initialize_dp_connector(dm, aconnector, link->link_index);
> + if (res)
> + goto fail_cleanup;
> }
> +
> + return 0;
> +fail_cleanup:
> + drm_connector_cleanup(&aconnector->base);
> +fail_id:
> + aconnector->connector_id = -1;
> +fail_free:
> + kfree(i2c);
> + aconnector->i2c = NULL;
> +
> return res;
> }
>
> 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 73cdb9fe981a..3dee9cce9c9e 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
> @@ -425,33 +425,39 @@ static const struct drm_dp_mst_topology_cbs dm_mst_cbs = {
> .add_connector = dm_dp_add_mst_connector,
> };
>
> -void amdgpu_dm_initialize_dp_connector(struct amdgpu_display_manager *dm,
> - struct amdgpu_dm_connector *aconnector,
> - int link_index)
> +int amdgpu_dm_initialize_dp_connector(struct amdgpu_display_manager *dm,
> + struct amdgpu_dm_connector *aconnector,
> + int link_index)
> {
> - aconnector->dm_dp_aux.aux.name =
> - kasprintf(GFP_KERNEL, "AMDGPU DM aux hw bus %d",
> - link_index);
> - aconnector->dm_dp_aux.aux.transfer = dm_dp_aux_transfer;
> - aconnector->dm_dp_aux.ddc_service = aconnector->dc_link->ddc;
> + struct amdgpu_dm_dp_aux *dm_aux = &aconnector->dm_dp_aux;
> + int ret;
>
> - drm_dp_aux_init(&aconnector->dm_dp_aux.aux);
> - drm_dp_cec_register_connector(&aconnector->dm_dp_aux.aux,
> - &aconnector->base);
> + dm_aux->aux.name = kasprintf(GFP_KERNEL, "AMDGPU DM aux hw bus %d", link_index);
> + if (!dm_aux->aux.name)
> + return -ENOMEM;
> +
> + dm_aux->aux.transfer = dm_dp_aux_transfer;
> + dm_aux->ddc_service = aconnector->dc_link->ddc;
> +
> + drm_dp_aux_init(&dm_aux->aux);
> + drm_dp_cec_register_connector(&dm_aux->aux, &aconnector->base);
>
> if (aconnector->base.connector_type == DRM_MODE_CONNECTOR_eDP)
> - return;
> + return 0;
>
> aconnector->mst_mgr.cbs = &dm_mst_cbs;
> - drm_dp_mst_topology_mgr_init(
> - &aconnector->mst_mgr,
> - adev_to_drm(dm->adev),
> - &aconnector->dm_dp_aux.aux,
> - 16,
> - 4,
> - aconnector->connector_id);
> + ret = drm_dp_mst_topology_mgr_init(&aconnector->mst_mgr, adev_to_drm(dm->adev),
> + &dm_aux->aux, 16, 4, aconnector->connector_id);
> + if (ret)
> + goto unreg_cec;
>
> drm_connector_attach_dp_subconnector_property(&aconnector->base);
> +
> + return 0;
> +unreg_cec:
> + drm_dp_cec_unregister_connector(&dm_aux->aux);
> + kfree(dm_aux->aux.name);
> + return ret;
> }
>
> int dm_mst_get_pbn_divider(struct dc_link *link)
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.h b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.h
> index b38bd68121ce..cf771ff58bb3 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.h
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.h
> @@ -31,9 +31,9 @@ struct amdgpu_dm_connector;
>
> int dm_mst_get_pbn_divider(struct dc_link *link);
>
> -void amdgpu_dm_initialize_dp_connector(struct amdgpu_display_manager *dm,
> - struct amdgpu_dm_connector *aconnector,
> - int link_index);
> +int amdgpu_dm_initialize_dp_connector(struct amdgpu_display_manager *dm,
> + struct amdgpu_dm_connector *aconnector,
> + int link_index);
>
> void
> dm_dp_create_fake_mst_encoders(struct amdgpu_device *adev);
>
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