From f3c03be182efccce3f6c2d8ceb35ba43e77ac128 Mon Sep 17 00:00:00 2001 From: Jani Nikula Date: Tue, 3 Dec 2024 17:17:10 +0200 Subject: [PATCH 1011/5403] drm/dp: extract drm_dp_dpcd_clear_payload() SST with 128b/132b channel coding needs this too. Extract to a separate helper, independent of MST. Cc: Lyude Paul Reviewed-by: Imre Deak Reviewed-by: Lyude Paul Link: https://patchwork.freedesktop.org/patch/msgid/904fa73ea9ea976185062eeb493a08ffc43ed27e.1733238941.git.jani.nikula@intel.com Signed-off-by: Jani Nikula --- drivers/gpu/drm/display/drm_dp_helper.c | 14 ++++++++++++++ drivers/gpu/drm/display/drm_dp_mst_topology.c | 2 +- include/drm/display/drm_dp_helper.h | 1 + 3 files changed, 16 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/display/drm_dp_helper.c b/drivers/gpu/drm/display/drm_dp_helper.c index 55eca899ce18..da3c8521a7fa 100644 --- a/drivers/gpu/drm/display/drm_dp_helper.c +++ b/drivers/gpu/drm/display/drm_dp_helper.c @@ -849,6 +849,20 @@ int drm_dp_dpcd_write_payload(struct drm_dp_aux *aux, } EXPORT_SYMBOL(drm_dp_dpcd_write_payload); +/** + * drm_dp_dpcd_clear_payload() - Clear the entire VC Payload ID table + * @aux: DisplayPort AUX channel + * + * Clear the entire VC Payload ID table. + * + * Returns: 0 on success, negative error code on errors. + */ +int drm_dp_dpcd_clear_payload(struct drm_dp_aux *aux) +{ + return drm_dp_dpcd_write_payload(aux, 0, 0, 0x3f); +} +EXPORT_SYMBOL(drm_dp_dpcd_clear_payload); + /** * drm_dp_dpcd_poll_act_handled() - Poll for ACT handled status * @aux: DisplayPort AUX channel diff --git a/drivers/gpu/drm/display/drm_dp_mst_topology.c b/drivers/gpu/drm/display/drm_dp_mst_topology.c index a426d13a7a36..307ce0981e2c 100644 --- a/drivers/gpu/drm/display/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/display/drm_dp_mst_topology.c @@ -3679,7 +3679,7 @@ int drm_dp_mst_topology_mgr_set_mst(struct drm_dp_mst_topology_mgr *mgr, bool ms goto out_unlock; /* Write reset payload */ - drm_dp_dpcd_write_payload(mgr->aux, 0, 0, 0x3f); + drm_dp_dpcd_clear_payload(mgr->aux); drm_dp_mst_queue_probe_work(mgr); diff --git a/include/drm/display/drm_dp_helper.h b/include/drm/display/drm_dp_helper.h index 69793815aa82..8f4054a56039 100644 --- a/include/drm/display/drm_dp_helper.h +++ b/include/drm/display/drm_dp_helper.h @@ -569,6 +569,7 @@ int drm_dp_dpcd_read_phy_link_status(struct drm_dp_aux *aux, int drm_dp_dpcd_write_payload(struct drm_dp_aux *aux, int vcpid, u8 start_time_slot, u8 time_slot_count); +int drm_dp_dpcd_clear_payload(struct drm_dp_aux *aux); int drm_dp_dpcd_poll_act_handled(struct drm_dp_aux *aux, int timeout_ms); bool drm_dp_send_real_edid_checksum(struct drm_dp_aux *aux, -- 2.54.0