diff options
| author | Nicolas Frattaroli <nicolas.frattaroli@collabora.com> | 2026-07-24 16:22:37 +0200 |
|---|---|---|
| committer | Daniel Stone <daniels@collabora.com> | 2026-08-13 16:07:41 +0100 |
| commit | 6c5121962ec0cb486fa189a0c5dc17441c2f9e9c (patch) | |
| tree | 8925d86869baf1008a31a1ab8e6b09604ea9fd79 /include/drm/display | |
| parent | ed4a19460fb9ff47d01f02c2375499c1110dd1b3 (diff) | |
drm/scdc-helper: Add scdc_status debugfs entry
SCDC provides status information on the current display link. At the
very least, it may be useful to expose this info through debugfs.
Add a debugfs entry for it under the connector, which displays a few
more details parsed out of the SCDC registers. A new
drm_scdc_debugfs_init function can be called by the connector
implementation to initialise the debugfs file.
Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@collabora.com>
Reviewed-by: Daniel Stone <daniels@collabora.com>
Acked-by: Maxime Ripard <mripard@kernel.org>
Tested-by: Hans Verkuil <hverkuil+cisco@kernel.org>
Link: https://patch.msgid.link/20260724-scdc-link-health-v9-2-bdda406d016d@collabora.com
Signed-off-by: Daniel Stone <daniels@collabora.com>
Diffstat (limited to 'include/drm/display')
| -rw-r--r-- | include/drm/display/drm_scdc_helper.h | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/include/drm/display/drm_scdc_helper.h b/include/drm/display/drm_scdc_helper.h index e9ccaeba56dd..e0b79d79e1ff 100644 --- a/include/drm/display/drm_scdc_helper.h +++ b/include/drm/display/drm_scdc_helper.h @@ -30,6 +30,34 @@ struct drm_connector; struct i2c_adapter; +struct dentry; + +struct drm_scdc_status_flags { + /* Status Register 0 */ + bool clock_detected; + bool ch0_locked; + bool ch1_locked; + bool ch2_locked; +}; + +struct drm_scdc_state { + /** @stf: contents of the status flag registers */ + struct drm_scdc_status_flags stf; + /** @scramling_enabled: true if TMDS scrambling is on */ + bool scrambling_enabled; + /** @scrambling_detected: true if the sink actually detected scrambling */ + bool scrambling_detected; + /** + * @tmds_bclk_x40: true if TMDS bit period is 1/40th of the TMDS + * clock period, false if it's 1/10th of the clock period. + */ + bool tmds_bclk_x40; + /** @error_count: character error counts for each channel */ + u16 error_count[3]; + + /** @scdc: raw SCDC data buffer */ + u8 scdc[256]; +}; int drm_scdc_read(struct i2c_adapter *adapter, u8 offset, void *buffer, size_t size); @@ -77,4 +105,8 @@ bool drm_scdc_get_scrambling_status(struct drm_connector *connector); bool drm_scdc_set_scrambling(struct drm_connector *connector, bool enable); bool drm_scdc_set_high_tmds_clock_ratio(struct drm_connector *connector, bool set); +int drm_scdc_read_state(struct drm_connector *connector, + struct drm_scdc_state *state); +void drm_scdc_debugfs_init(struct drm_connector *connector, struct dentry *root); + #endif |