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Commit a402223e authored by Huaibin Yang's avatar Huaibin Yang
Browse files

msm: mdss: calculate prefill bandwidth using the worst case vbp 



The blanking period of a panel is determined by vbp factor: vertical
back porch plus vsync pulse width. The larger vbp, the larger blanking
time, and the smaller prefill bandwidth request. When two or more
types of interfaces/panels are involved, although each panel has its
own vbp, there is an option to calculate the prefill bandwidth for
each panel with the worst case vbp of all panels. This way there is no
need to increase fudge factor to avoid underruns.

Change-Id: I60dda6ad41bbb353c58ef93cf97787c4da3929dc
Signed-off-by: default avatarHuaibin Yang <huaibiny@codeaurora.org>
parent 72dc7e0b

drivers/video/msm/mdss/mdss_mdp_ctl.c

+25 −1
Original line number Diff line number Diff line
@@ -487,6 +487,29 @@ static u32 mdss_mdp_get_vbp_factor(struct mdss_mdp_ctl *ctl) 
	return vbp_fac;

}



static u32 mdss_mdp_get_vbp_factor_max(struct mdss_mdp_ctl *ctl)

{

	u32 vbp_max = 0;

	int i;

	struct mdss_data_type *mdata;



	if (!ctl || !ctl->mdata)

		return 0;



	mdata = ctl->mdata;

	for (i = 0; i < mdata->nctl; i++) {

		struct mdss_mdp_ctl *ctl = mdata->ctl_off + i;

		u32 vbp_fac;



		if (ctl->power_on) {

			vbp_fac = mdss_mdp_get_vbp_factor(ctl);

			vbp_max = max(vbp_max, vbp_fac);

		}

	}



	return vbp_max;

}



static void mdss_mdp_perf_calc_ctl(struct mdss_mdp_ctl *ctl,

		struct mdss_mdp_perf_params *perf)

{
@@ -522,7 +545,8 @@ static void mdss_mdp_perf_calc_ctl(struct mdss_mdp_ctl *ctl, 
		perf->bw_overlap = SZ_16M;



	if (ctl->intf_type != MDSS_MDP_NO_INTF) {

		u32 vbp_fac = mdss_mdp_get_vbp_factor(ctl);

		u32 vbp_fac = mdss_mdp_get_vbp_factor_max(ctl);



		perf->bw_prefill = perf->prefill_bytes;

		/*

		 * Prefill bandwidth equals the amount of data (number