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Commit f25ddcc7 authored by Krishna Chaitanya Devarakonda's avatar Krishna Chaitanya Devarakonda
Browse files

msm: mdss: Allow WB to use first available control path 



WB timeouts are seen when WB is connected after 4k HDMI
use case. This was seen when WB is using the same Mixer
which was earlier used by HDMI, with 3D Mux enabled.
Since 3D Mux registers are double buffered, the best way
to clear control operations is to re-use the control path.
Hence allowing WB to choose the first available control
path.

Change-Id: Ie599a6d58f461ee7905402bf0a948ac829d8de12
Signed-off-by: default avatarKrishna Chaitanya Devarakonda <kdevarak@codeaurora.org>
parent 1a5123de

drivers/video/msm/mdss/mdss_mdp.h

+13 −4
Original line number Diff line number Diff line
@@ -1315,12 +1315,21 @@ static inline int mdss_mdp_get_wb_ctl_support(struct mdss_data_type *mdata, 
							bool rotator_session)

{

	/*

	 * Initial control paths are used for primary and external

	 * interfaces and remaining control paths are used for WB

	 * interfaces.

	 * Any control path can be routed to any of the hardware datapaths.

	 * But there is a HW restriction for 3D Mux block. As the 3D Mux

	 * settings in the CTL registers are double buffered, if an interface

	 * uses it and disconnects, then the subsequent interface which gets

	 * connected should use the same control path in order to clear the

	 * 3D MUX settings.

	 * To handle this restriction, we are allowing WB also, to loop through

	 * all the avialable control paths, so that it can reuse the control

	 * path left by the external interface, thereby clearing the 3D Mux

	 * settings.

	 * The initial control paths can be used by Primary, External and WB.

	 * The rotator can use the remaining available control paths.

	 */

	return rotator_session ? (mdata->nctl - mdata->nmixers_wb) :

				(mdata->nctl - mdata->nwb);

		MDSS_MDP_CTL0;

}



static inline bool mdss_mdp_is_nrt_vbif_client(struct mdss_data_type *mdata,