[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
Change-Id: Ic881c0c729c5444b80256ccfe55ac52cec345388
Cc: Leo Li <sunpeng.li@xxxxxxx>
Cc: Harry Wentland <harry.wentland@xxxxxxx>
Signed-off-by: Nicholas Kazlauskas <nicholas.kazlauskas@xxxxxxx>
---
.../amd/display/amdgpu_dm/amdgpu_dm_debugfs.c | 74 ++++++++++++++++++-
1 file changed, 72 insertions(+), 2 deletions(-)
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 1d5fc5ad3bee..0de86a7e31b5 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
@@ -672,6 +672,74 @@ 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;
+
+ if (connector->status != connector_status_connected)
+ return -ENODEV;
+
+ 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 +798,6 @@ 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 +880,9 @@ 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 +935,7 @@ 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},
--
2.17.1
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