From c908b1c4bb56c27fa6fbb48e2d3dbebdad366706 Mon Sep 17 00:00:00 2001 From: "David (Dingchen) Zhang" Date: Fri, 6 Dec 2019 17:56:37 -0500 Subject: drm: add dp helper to initialize remote aux channel. [why] We need to minimally initialize the remote aux channel, e.g. the crc work struct of remote aux to dump the sink's DPRX CRCs in MST setup. [how] Add helper that only initializes the crc work struct of the remote aux, hooke crc work queue to 'drm_dp_aux_crc_work'. Then call this helper in DP MST port initialization. This, plus David Francis' patch [1], fix the issue of MST remote aux DPCD CRCs read. [1] https://patchwork.kernel.org/patch/11217941/ Cc: Leo Li Cc: Harry Wentland Signed-off-by: David (Dingchen) Zhang Reviewed-by: Harry Wentland Signed-off-by: Alex Deucher --- drivers/gpu/drm/drm_dp_helper.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'drivers/gpu/drm/drm_dp_helper.c') diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c index 374cedc6c2ac..a5364b5192b8 100644 --- a/drivers/gpu/drm/drm_dp_helper.c +++ b/drivers/gpu/drm/drm_dp_helper.c @@ -978,6 +978,19 @@ static void drm_dp_aux_crc_work(struct work_struct *work) } } +/** + * drm_dp_remote_aux_init() - minimally initialise a remote aux channel + * @aux: DisplayPort AUX channel + * + * Used for remote aux channel in general. Merely initialize the crc work + * struct. + */ +void drm_dp_remote_aux_init(struct drm_dp_aux *aux) +{ + INIT_WORK(&aux->crc_work, drm_dp_aux_crc_work); +} +EXPORT_SYMBOL(drm_dp_remote_aux_init); + /** * drm_dp_aux_init() - minimally initialise an aux channel * @aux: DisplayPort AUX channel -- cgit v1.2.3