From: Thomas Zimmermann <tzimmermann@suse.de> maillist inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/IC0U9U CVE: NA Reference: https://web.git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commi... ---------------------------------------------------------------------- Implement polling for VGA and SIL164 connectors. Set the flag DRM_CONNECTOR_POLL_DISCONNECT for each to detect the removal of the monitor cable. Implement struct drm_connector_helper_funcs.detect_ctx for each type of connector by testing for EDID data. The helper drm_connector_helper_detect_ctx() implements .detect_ctx() on top of the connector's DDC channel. The function can be used by other drivers as companion to drm_connector_helper_get_modes(). v6: - change helper name to drm_connector_helper_detec_from_ddc() (Maxime, Sui) v5: - share implementation in drm_connector_helper_detect_ctx() (Maxime) - test for DDC presence with drm_probe_ddc() (Maxime, Jani) Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com> Acked-by: Sui Jingfeng <sui.jingfeng@linux.dev> Acked-by: Maxime Ripard <mripard@kernel.org> Link: https://patchwork.freedesktop.org/patch/msgid/20240325200855.21150-13-tzimme... --- drivers/gpu/drm/drm_probe_helper.c | 29 +++++++++++++++++++++++++++++ include/drm/drm_probe_helper.h | 4 ++++ 2 files changed, 33 insertions(+) diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c index c90afb5d0..03a3fb803 100644 --- a/drivers/gpu/drm/drm_probe_helper.c +++ b/drivers/gpu/drm/drm_probe_helper.c @@ -1313,3 +1313,32 @@ int drm_connector_helper_tv_get_modes(struct drm_connector *connector) return i; } EXPORT_SYMBOL(drm_connector_helper_tv_get_modes); + +/** + * drm_connector_helper_detect_from_ddc - Read EDID and detect connector status. + * @connector: The connector + * @ctx: Acquire context + * @force: Perform screen-destructive operations, if necessary + * + * Detects the connector status by reading the EDID using drm_probe_ddc(), + * which requires connector->ddc to be set. Returns connector_status_connected + * on success or connector_status_disconnected on failure. + * + * Returns: + * The connector status as defined by enum drm_connector_status. + */ +int drm_connector_helper_detect_from_ddc(struct drm_connector *connector, + struct drm_modeset_acquire_ctx *ctx, + bool force) +{ + struct i2c_adapter *ddc = connector->ddc; + + if (!ddc) + return connector_status_unknown; + + if (drm_probe_ddc(ddc)) + return connector_status_connected; + + return connector_status_disconnected; +} +EXPORT_SYMBOL(drm_connector_helper_detect_from_ddc); diff --git a/include/drm/drm_probe_helper.h b/include/drm/drm_probe_helper.h index fad3c4003..4b7bc31a3 100644 --- a/include/drm/drm_probe_helper.h +++ b/include/drm/drm_probe_helper.h @@ -38,4 +38,8 @@ int drm_connector_helper_get_modes_fixed(struct drm_connector *connector, int drm_connector_helper_get_modes(struct drm_connector *connector); int drm_connector_helper_tv_get_modes(struct drm_connector *connector); +int drm_connector_helper_detect_from_ddc(struct drm_connector *connector, + struct drm_modeset_acquire_ctx *ctx, + bool force); + #endif -- 2.33.0