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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.

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>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Leo (Hanghong) Ma 2019-03-07 16:18:12 -05:00 committed by Alex Deucher
parent d5f90f3a0a
commit c7ba3653e9
1 changed files with 49 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

50
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
View File

@ -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)