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From e2aa15907fad232481c4802483e560a253f4c530 Mon Sep 17 00:00:00 2001
From: "Leo (Hanghong) Ma" <hanghong.ma@amd.com>
Date: Thu, 7 Mar 2019 16:18:12 -0500
Subject: [PATCH 1655/2940] drm/amd/display: Generic SDP message access in
amdgpu
[Why]
We need to add DP SDP message test debugfs to make sdp message test
more convenient and efficient.
[How]
Add sdp_message debugfs entry in amdgpu.
Change-Id: I3bb349566bb255c1515470694b1aff602a12cc77
Signed-off-by: Leo (Hanghong) Ma <hanghong.ma@amd.com>
Reviewed-by: Sun peng Li <Sunpeng.Li@amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com>
Acked-by: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
---
.../amd/display/amdgpu_dm/amdgpu_dm_debugfs.c | 50 ++++++++++++++++++-
1 file changed, 49 insertions(+), 1 deletion(-)
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 4a55cde027cf..842ddd37fb81 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
@@ -688,6 +688,47 @@ static int vrr_range_show(struct seq_file *m, void *data)
return 0;
}
+
+/* function description
+ *
+ * generic SDP message access for testing
+ *
+ * debugfs sdp_message is located at /syskernel/debug/dri/0/DP-x
+ *
+ * SDP header
+ * Hb0 : Secondary-Data Packet ID
+ * Hb1 : Secondary-Data Packet type
+ * Hb2 : Secondary-Data-packet-specific header, Byte 0
+ * Hb3 : Secondary-Data-packet-specific header, Byte 1
+ *
+ * for using custom sdp message: input 4 bytes SDP header and 32 bytes raw data
+ */
+static ssize_t dp_sdp_message_debugfs_write(struct file *f, const char __user *buf,
+ size_t size, loff_t *pos)
+{
+ int r;
+ uint8_t data[36];
+ struct amdgpu_dm_connector *connector = file_inode(f)->i_private;
+ struct dm_crtc_state *acrtc_state;
+ uint32_t write_size = 36;
+
+ if (connector->base.status != connector_status_connected)
+ return -ENODEV;
+
+ if (size == 0)
+ return 0;
+
+ acrtc_state = to_dm_crtc_state(connector->base.state->crtc->state);
+
+ r = copy_from_user(data, buf, write_size);
+
+ write_size -= r;
+
+ dc_stream_send_dp_sdp(acrtc_state->stream, data, write_size);
+
+ return write_size;
+}
+
DEFINE_SHOW_ATTRIBUTE(vrr_range);
static const struct file_operations dp_link_settings_debugfs_fops = {
@@ -710,6 +751,12 @@ static const struct file_operations dp_phy_test_pattern_fops = {
.llseek = default_llseek
};
+static const struct file_operations sdp_message_fops = {
+ .owner = THIS_MODULE,
+ .write = dp_sdp_message_debugfs_write,
+ .llseek = default_llseek
+};
+
static const struct {
char *name;
const struct file_operations *fops;
@@ -717,7 +764,8 @@ static const struct {
{"link_settings", &dp_link_settings_debugfs_fops},
{"phy_settings", &dp_phy_settings_debugfs_fop},
{"test_pattern", &dp_phy_test_pattern_fops},
- {"vrr_range", &vrr_range_fops}
+ {"vrr_range", &vrr_range_fops},
+ {"sdp_message", &sdp_message_fops}
};
int connector_debugfs_init(struct amdgpu_dm_connector *connector)
--
2.17.1
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