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drm/amd/display: Add debugfs entry for LTTPR register status

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[Why]
Functionality of LTTPR is reporter through the DPCD register

[How]
Expose a interface in debugfs to read the current status of
LTTPR as reported from the device's DPCD register

Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Acked-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Aurabindo Pillai 2021-03-23 17:51:56 -04:00 committed by Alex Deucher
parent 9df857f930
commit 37bedd9929
1 changed files with 66 additions and 0 deletions
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66
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
View File

@ -400,6 +400,70 @@ static ssize_t dp_phy_settings_read(struct file *f, char __user *buf,
return result;
}
static int dp_lttpr_status_show(struct seq_file *m, void *d)
{
char *data;
struct amdgpu_dm_connector *connector = file_inode(m->file)->i_private;
struct dc_link *link = connector->dc_link;
uint32_t read_size = 1;
uint8_t repeater_count = 0;
data = kzalloc(read_size, GFP_KERNEL);
if (!data)
return 0;
dm_helpers_dp_read_dpcd(link->ctx, link, 0xF0002, data, read_size);
switch ((uint8_t)*data) {
case 0x80:
repeater_count = 1;
break;
case 0x40:
repeater_count = 2;
break;
case 0x20:
repeater_count = 3;
break;
case 0x10:
repeater_count = 4;
break;
case 0x8:
repeater_count = 5;
break;
case 0x4:
repeater_count = 6;
break;
case 0x2:
repeater_count = 7;
break;
case 0x1:
repeater_count = 8;
break;
case 0x0:
repeater_count = 0;
break;
default:
repeater_count = (uint8_t)*data;
break;
}
seq_printf(m, "phy repeater count: %d\n", repeater_count);
dm_helpers_dp_read_dpcd(link->ctx, link, 0xF0003, data, read_size);
if ((uint8_t)*data == 0x55)
seq_printf(m, "phy repeater mode: transparent\n");
else if ((uint8_t)*data == 0xAA)
seq_printf(m, "phy repeater mode: non-transparent\n");
else if ((uint8_t)*data == 0x00)
seq_printf(m, "phy repeater mode: non lttpr\n");
else
seq_printf(m, "phy repeater mode: read error\n");
kfree(data);
return 0;
}
static ssize_t dp_phy_settings_write(struct file *f, const char __user *buf,
size_t size, loff_t *pos)
{
@ -2301,6 +2365,7 @@ DEFINE_SHOW_ATTRIBUTE(dp_dsc_fec_support);
DEFINE_SHOW_ATTRIBUTE(dmub_fw_state);
DEFINE_SHOW_ATTRIBUTE(dmub_tracebuffer);
DEFINE_SHOW_ATTRIBUTE(output_bpc);
DEFINE_SHOW_ATTRIBUTE(dp_lttpr_status);
#ifdef CONFIG_DRM_AMD_DC_HDCP
DEFINE_SHOW_ATTRIBUTE(hdcp_sink_capability);
#endif
@ -2421,6 +2486,7 @@ static const struct {
} dp_debugfs_entries[] = {
{"link_settings", &dp_link_settings_debugfs_fops},
{"phy_settings", &dp_phy_settings_debugfs_fop},
{"lttpr_status", &dp_lttpr_status_fops},
{"test_pattern", &dp_phy_test_pattern_fops},
#ifdef CONFIG_DRM_AMD_DC_HDCP
{"hdcp_sink_capability", &hdcp_sink_capability_fops},