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drm/amd/display: Add connector debugfs for "output_bpc"

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[Why]
This will be useful for verifying whether we enter the correct output
color depth from IGT.

[How]
Locks the connector and associated CRTC if available and outputs
the current and maximum output bpc values.

Example:

cat /sys/kernel/debug/dri/0/DP-1/output_bpc
Current: 8
Maximum: 10

v2: Drop unneeded connector status check

Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@amd.com>
Reviewed-by: David Francis <David.Francis@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Nicholas Kazlauskas 2019-06-03 13:44:37 -04:00 committed by Alex Deucher
parent 80f41f84ae
commit 4b7ef85cc6
1 changed files with 69 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

71
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_debugfs.c
View File

@ -672,6 +672,71 @@ static ssize_t dp_phy_test_pattern_debugfs_write(struct file *f, const char __us
return bytes_from_user;
}
/*
* Returns the current and maximum output bpc for the connector.
* Example usage: cat /sys/kernel/debug/dri/0/DP-1/output_bpc
*/
static int output_bpc_show(struct seq_file *m, void *data)
{
struct drm_connector *connector = m->private;
struct drm_device *dev = connector->dev;
struct drm_crtc *crtc = NULL;
struct dm_crtc_state *dm_crtc_state = NULL;
int res = -ENODEV;
unsigned int bpc;
mutex_lock(&dev->mode_config.mutex);
drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
if (connector->state == NULL)
goto unlock;
crtc = connector->state->crtc;
if (crtc == NULL)
goto unlock;
drm_modeset_lock(&crtc->mutex, NULL);
if (crtc->state == NULL)
goto unlock;
dm_crtc_state = to_dm_crtc_state(crtc->state);
if (dm_crtc_state->stream == NULL)
goto unlock;
switch (dm_crtc_state->stream->timing.display_color_depth) {
case COLOR_DEPTH_666:
bpc = 6;
break;
case COLOR_DEPTH_888:
bpc = 8;
break;
case COLOR_DEPTH_101010:
bpc = 10;
break;
case COLOR_DEPTH_121212:
bpc = 12;
break;
case COLOR_DEPTH_161616:
bpc = 16;
break;
default:
goto unlock;
}
seq_printf(m, "Current: %u\n", bpc);
seq_printf(m, "Maximum: %u\n", connector->display_info.bpc);
res = 0;
unlock:
if (crtc)
drm_modeset_unlock(&crtc->mutex);
drm_modeset_unlock(&dev->mode_config.connection_mutex);
mutex_unlock(&dev->mode_config.mutex);
return res;
}
/*
* Returns the min and max vrr vfreq through the connector's debugfs file.
* Example usage: cat /sys/kernel/debug/dri/0/DP-1/vrr_range
@ -730,8 +795,6 @@ static ssize_t dp_sdp_message_debugfs_write(struct file *f, const char __user *b
return write_size;
}
DEFINE_SHOW_ATTRIBUTE(vrr_range);
static ssize_t dp_dpcd_address_write(struct file *f, const char __user *buf,
size_t size, loff_t *pos)
{
@ -814,6 +877,9 @@ static ssize_t dp_dpcd_data_read(struct file *f, char __user *buf,
return read_size - r;
}
DEFINE_SHOW_ATTRIBUTE(output_bpc);
DEFINE_SHOW_ATTRIBUTE(vrr_range);
static const struct file_operations dp_link_settings_debugfs_fops = {
.owner = THIS_MODULE,
.read = dp_link_settings_read,
@ -866,6 +932,7 @@ static const struct {
{"link_settings", &dp_link_settings_debugfs_fops},
{"phy_settings", &dp_phy_settings_debugfs_fop},
{"test_pattern", &dp_phy_test_pattern_fops},
{"output_bpc", &output_bpc_fops},
{"vrr_range", &vrr_range_fops},
{"sdp_message", &sdp_message_fops},
{"aux_dpcd_address", &dp_dpcd_address_debugfs_fops},