[PATCH 2/3] drm: Create a drm_connector_helper_funcs hook for Adaptive Sync support

[Manasi Navare <manasi.d.navare@intel.com>]

This patch adds a hook in drm_connector_helper_funcs to get the
support of the driver for adaptive sync functionality.

This can be called in the connector probe helper function after
the connector detect() and get_modes() hooks to also
query the adaptive sync support of the driver.

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
Cc: Harry Wentland <harry.wentland@amd.com>
Cc: Nicholas Kazlauskas <Nicholas.Kazlauskas@amd.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
---
 drivers/gpu/drm/drm_probe_helper.c       |  4 ++++
 include/drm/drm_modeset_helper_vtables.h | 16 ++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
index 576b4b7dcd89..4403817bfb02 100644
--- a/drivers/gpu/drm/drm_probe_helper.c
+++ b/drivers/gpu/drm/drm_probe_helper.c
@@ -482,6 +482,10 @@ int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
 
 	count = (*connector_funcs->get_modes)(connector);
 
+	/* Get the Adaptive Sync Support if helper exists */
+	if (*connector_funcs->get_adaptive_sync_support)
+		(**connector_funcs->get_adaptive_sync_support)(connector);
+
 	/*
 	 * Fallback for when DDC probe failed in drm_get_edid() and thus skipped
 	 * override/firmware EDID.
diff --git a/include/drm/drm_modeset_helper_vtables.h b/include/drm/drm_modeset_helper_vtables.h
index 7c20b1c8b6a7..0b203fdd25df 100644
--- a/include/drm/drm_modeset_helper_vtables.h
+++ b/include/drm/drm_modeset_helper_vtables.h
@@ -1079,6 +1079,22 @@ struct drm_connector_helper_funcs {
 				     struct drm_writeback_job *job);
 	void (*cleanup_writeback_job)(struct drm_writeback_connector *connector,
 				      struct drm_writeback_job *job);
+
+	/**
+	 * @get_adaptive_sync_support:
+	 *
+	 * This hook is used by the probe helper to get the driver's support
+	 * for adaptive sync or variable refresh rate.
+	 * This is called from drm_helper_probe_single_connector_modes()
+	 * This is called after the @get_modes hook so that the connector modes
+	 * are already obtained and EDID is parsed to obtain the monitor
+	 * range descriptor information.
+	 *
+	 * This hook is optional and defined only for the drivers and on
+	 * connectors that advertise adaptive sync support.
+	 *
+	 */
+	void (*get_adaptive_sync_support)(struct drm_connector *connector);
 };
 
 /**
-- 
2.19.1

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