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Subject: Re: [PATCH v3 1/4] dp/dp_mst: Add support for sink event notify
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To:     Sam McNally <sammc@chromium.org>,
        LKML <linux-kernel@vger.kernel.org>
Cc:     Thomas Zimmermann <tzimmermann@suse.de>,
        David Airlie <airlied@linux.ie>,
        dri-devel@lists.freedesktop.org, lyude@redhat.com
References: <20200923121320.v3.1.I8693156f555875e5c8342e86ab37ce968dfdd277@changeid>
 <57384ff32e3b42e8ea72ca298e9ae1f7fdac25d7.camel@redhat.com>
From:   Hans Verkuil <hverkuil@xs4all.nl>
Message-ID: <a2a23c6a-4c38-59ee-7b96-70140ada0f44@xs4all.nl>
Date:   Wed, 3 Feb 2021 10:56:52 +0100
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Hi Sam,

Are you able to work on a v4?

I haven't heard from you for some time now. I would be willing to take over
this series if it wasn't for the fact that I do not have any hardware to test
this with.

Regards,

	Hans

On 01/02/2021 22:56, Lyude Paul wrote:
> On Wed, 2020-09-23 at 12:13 +1000, Sam McNally wrote:
>> Sink event notify messages are used for MST CEC IRQs. Add parsing
>> support for sink event notify messages in preparation for handling MST
>> CEC IRQs.
>>
>> Signed-off-by: Sam McNally <sammc@chromium.org>
>> ---
>>
>> (no changes since v1)
>>
>>  drivers/gpu/drm/drm_dp_mst_topology.c | 37 ++++++++++++++++++++++++++-
>>  include/drm/drm_dp_mst_helper.h       | 14 ++++++++++
>>  2 files changed, 50 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c
>> b/drivers/gpu/drm/drm_dp_mst_topology.c
>> index 17dbed0a9800..15b6cc39a754 100644
>> --- a/drivers/gpu/drm/drm_dp_mst_topology.c
>> +++ b/drivers/gpu/drm/drm_dp_mst_topology.c
>> @@ -1027,6 +1027,30 @@ static bool
>> drm_dp_sideband_parse_resource_status_notify(struct drm_dp_sideband_
>>         return false;
>>  }
>>  
>> +static bool drm_dp_sideband_parse_sink_event_notify(
>> +       struct drm_dp_sideband_msg_rx *raw,
>> +       struct drm_dp_sideband_msg_req_body *msg)
>> +{
>> +       int idx = 1;
>> +
>> +       msg->u.sink_event.port_number = (raw->msg[idx] & 0xf0) >> 4;
>> +       idx++;
>> +       if (idx > raw->curlen)
>> +               goto fail_len;
>> +
>> +       memcpy(msg->u.sink_event.guid, &raw->msg[idx], 16);
>> +       idx += 16;
>> +       if (idx > raw->curlen)
>> +               goto fail_len;
>> +
>> +       msg->u.sink_event.event_id = (raw->msg[idx] << 8) | (raw->msg[idx +
>> 1]);
>> +       idx++;
>> +       return true;
>> +fail_len:
>> +       DRM_DEBUG_KMS("sink event notify parse length fail %d %d\n", idx, raw-
>>> curlen);
> 
> Is it possible for us to use drm_dbg_kms() here?
> 
> Also-there is an MST selftest you should update for this
> 
>> +       return false;
>> +}
>> +
>>  static bool drm_dp_sideband_parse_req(struct drm_dp_sideband_msg_rx *raw,
>>                                       struct drm_dp_sideband_msg_req_body
>> *msg)
>>  {
>> @@ -1038,6 +1062,8 @@ static bool drm_dp_sideband_parse_req(struct
>> drm_dp_sideband_msg_rx *raw,
>>                 return drm_dp_sideband_parse_connection_status_notify(raw,
>> msg);
>>         case DP_RESOURCE_STATUS_NOTIFY:
>>                 return drm_dp_sideband_parse_resource_status_notify(raw, msg);
>> +       case DP_SINK_EVENT_NOTIFY:
>> +               return drm_dp_sideband_parse_sink_event_notify(raw, msg);
>>         default:
>>                 DRM_ERROR("Got unknown request 0x%02x (%s)\n", msg->req_type,
>>                           drm_dp_mst_req_type_str(msg->req_type));
>> @@ -3875,6 +3901,8 @@ drm_dp_mst_process_up_req(struct drm_dp_mst_topology_mgr
>> *mgr,
>>                         guid = msg->u.conn_stat.guid;
>>                 else if (msg->req_type == DP_RESOURCE_STATUS_NOTIFY)
>>                         guid = msg->u.resource_stat.guid;
>> +               else if (msg->req_type == DP_SINK_EVENT_NOTIFY)
>> +                       guid = msg->u.sink_event.guid;
>>  
>>                 if (guid)
>>                         mstb = drm_dp_get_mst_branch_device_by_guid(mgr,
>> guid);
>> @@ -3948,7 +3976,8 @@ static int drm_dp_mst_handle_up_req(struct
>> drm_dp_mst_topology_mgr *mgr)
>>         drm_dp_sideband_parse_req(&mgr->up_req_recv, &up_req->msg);
>>  
>>         if (up_req->msg.req_type != DP_CONNECTION_STATUS_NOTIFY &&
>> -           up_req->msg.req_type != DP_RESOURCE_STATUS_NOTIFY) {
>> +           up_req->msg.req_type != DP_RESOURCE_STATUS_NOTIFY &&
>> +           up_req->msg.req_type != DP_SINK_EVENT_NOTIFY) {
>>                 DRM_DEBUG_KMS("Received unknown up req type, ignoring: %x\n",
>>                               up_req->msg.req_type);
>>                 kfree(up_req);
>> @@ -3976,6 +4005,12 @@ static int drm_dp_mst_handle_up_req(struct
>> drm_dp_mst_topology_mgr *mgr)
>>                 DRM_DEBUG_KMS("Got RSN: pn: %d avail_pbn %d\n",
>>                               res_stat->port_number,
>>                               res_stat->available_pbn);
>> +       } else if (up_req->msg.req_type == DP_SINK_EVENT_NOTIFY) {
>> +               const struct drm_dp_sink_event_notify *sink_event =
>> +                       &up_req->msg.u.sink_event;
>> +
>> +               DRM_DEBUG_KMS("Got SEN: pn: %d event_id %d\n",
>> +                             sink_event->port_number, sink_event->event_id);
>>         }
>>  
>>         up_req->hdr = mgr->up_req_recv.initial_hdr;
>> diff --git a/include/drm/drm_dp_mst_helper.h b/include/drm/drm_dp_mst_helper.h
>> index 6ae5860d8644..c7c79e0ced18 100644
>> --- a/include/drm/drm_dp_mst_helper.h
>> +++ b/include/drm/drm_dp_mst_helper.h
>> @@ -402,6 +402,19 @@ struct drm_dp_resource_status_notify {
>>         u16 available_pbn;
>>  };
>>  
>> +#define DP_SINK_EVENT_PANEL_REPLAY_ACTIVE_FRAME_CRC_ERROR      BIT(0)
>> +#define DP_SINK_EVENT_PANEL_REPLAY_RFB_STORAGE_ERROR           BIT(1)
>> +#define DP_SINK_EVENT_DSC_RC_BUFFER_UNDER_RUN                  BIT(2)
>> +#define DP_SINK_EVENT_DSC_RC_BUFFER_OVERFLOW                   BIT(3)
>> +#define DP_SINK_EVENT_DSC_CHUNK_LENGTH_ERROR                   BIT(4)
>> +#define DP_SINK_EVENT_CEC_IRQ_EVENT                            BIT(5)
>> +
>> +struct drm_dp_sink_event_notify {
>> +       u8 port_number;
>> +       u8 guid[16];
>> +       u16 event_id;
>> +};
>> +
>>  struct drm_dp_query_payload_ack_reply {
>>         u8 port_number;
>>         u16 allocated_pbn;
>> @@ -413,6 +426,7 @@ struct drm_dp_sideband_msg_req_body {
>>                 struct drm_dp_connection_status_notify conn_stat;
>>                 struct drm_dp_port_number_req port_num;
>>                 struct drm_dp_resource_status_notify resource_stat;
>> +               struct drm_dp_sink_event_notify sink_event;
>>  
>>                 struct drm_dp_query_payload query_payload;
>>                 struct drm_dp_allocate_payload allocate_payload;
>