From: Wayne Lin <Wayne.Lin@amd.com>
To: <dri-devel@lists.freedesktop.org>, <amd-gfx@lists.freedesktop.org>
Cc: jerry.zuo@amd.com, Nicholas.Kazlauskas@amd.com,
Wayne Lin <Wayne.Lin@amd.com>
Subject: [PATCH 1/2] drm/dp_mst: Add a function to determine the mst end device
Date: Wed, 8 Jan 2020 16:44:15 +0800 [thread overview]
Message-ID: <20200108084416.6296-2-Wayne.Lin@amd.com> (raw)
In-Reply-To: <20200108084416.6296-1-Wayne.Lin@amd.com>
[Why]
For later usage convenience, add the function
drm_dp_mst_is_dp_mst_end_device() to decide whether a peer device
connected to a DFP is mst end device. Which also indicates if the peer
device is capable of handling message or not.
Signed-off-by: Wayne Lin <Wayne.Lin@amd.com>
---
drivers/gpu/drm/drm_dp_mst_topology.c | 16 ++++++++++++++++
1 file changed, 16 insertions(+)
diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
index eebf325d7f48..8f54b241db08 100644
--- a/drivers/gpu/drm/drm_dp_mst_topology.c
+++ b/drivers/gpu/drm/drm_dp_mst_topology.c
@@ -1918,6 +1918,22 @@ static u8 drm_dp_calculate_rad(struct drm_dp_mst_port *port,
return parent_lct + 1;
}
+static bool drm_dp_mst_is_dp_mst_end_device(u8 pdt, bool mcs)
+{
+ switch (pdt) {
+ case DP_PEER_DEVICE_DP_LEGACY_CONV:
+ case DP_PEER_DEVICE_SST_SINK:
+ return true;
+ case DP_PEER_DEVICE_MST_BRANCHING:
+ /* For sst branch device */
+ if (!mcs)
+ return true;
+
+ return false;
+ }
+ return true;
+}
+
static int drm_dp_port_set_pdt(struct drm_dp_mst_port *port, u8 new_pdt)
{
struct drm_dp_mst_topology_mgr *mgr = port->mgr;
--
2.17.1
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
next prev parent reply other threads:[~2020-01-08 8:45 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-08 8:44 [PATCH 0/2] Take SST-only branch device into account Wayne Lin
2020-01-08 8:44 ` Wayne Lin [this message]
2020-01-14 21:15 ` [PATCH 1/2] drm/dp_mst: Add a function to determine the mst end device Lyude Paul
2020-01-15 2:40 ` Lin, Wayne
2020-01-08 8:44 ` [PATCH 2/2] drm/dp_mst: Handle SST-only branch device case Wayne Lin
2020-01-14 21:18 ` Lyude Paul
2020-01-15 2:43 ` Lin, Wayne
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20200108084416.6296-2-Wayne.Lin@amd.com \
--to=wayne.lin@amd.com \
--cc=Nicholas.Kazlauskas@amd.com \
--cc=amd-gfx@lists.freedesktop.org \
--cc=dri-devel@lists.freedesktop.org \
--cc=jerry.zuo@amd.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).