diff --git a/msm/dsi/dsi_panel.c b/msm/dsi/dsi_panel.c index 9f74660840..927ddf1459 100644 --- a/msm/dsi/dsi_panel.c +++ b/msm/dsi/dsi_panel.c @@ -30,6 +30,7 @@ #define DEFAULT_PANEL_JITTER_ARRAY_SIZE 2 #define MAX_PANEL_JITTER 10 #define DEFAULT_PANEL_PREFILL_LINES 25 +#define MIN_PREFILL_LINES 35 enum dsi_dsc_ratio_type { DSC_8BPC_8BPP, @@ -3535,6 +3536,8 @@ void dsi_panel_calc_dsi_transfer_time(struct dsi_host_common_cfg *config, struct msm_display_dsc_info *dsc = mode->timing.dsc; struct dsi_mode_info *timing = &mode->timing; struct dsi_display_mode *display_mode; + u32 jitter_numer, jitter_denom, prefill_lines; + u32 min_threshold_us, prefill_time_us; /* Packet overlead in bits,2 bytes header + 2 bytes checksum * + 1 byte dcs data command. @@ -3543,6 +3546,9 @@ void dsi_panel_calc_dsi_transfer_time(struct dsi_host_common_cfg *config, display_mode = container_of(timing, struct dsi_display_mode, timing); + jitter_numer = display_mode->priv_info->panel_jitter_numer; + jitter_denom = display_mode->priv_info->panel_jitter_denom; + frame_time_us = mult_frac(1000, 1000, (timing->refresh_rate)); if (timing->dsc_enabled) { @@ -3574,6 +3580,30 @@ void dsi_panel_calc_dsi_transfer_time(struct dsi_host_common_cfg *config, timing->dsi_transfer_time_us = mode->priv_info->mdp_transfer_time_us; } else { + + min_threshold_us = mult_frac(frame_time_us, + jitter_numer, (jitter_denom * 100)); + /* + * Increase the prefill_lines proportionately as recommended + * 35lines for 60fps, 52 for 90fps, 70lines for 120fps. + */ + prefill_lines = mult_frac(MIN_PREFILL_LINES, + timing->refresh_rate, 60); + + prefill_time_us = mult_frac(frame_time_us, prefill_lines, + (timing->v_active)); + + /* + * Threshold is sum of panel jitter time, prefill line time + * plus 100usec buffer time. + */ + min_threshold_us = min_threshold_us + 100 + prefill_time_us; + + DSI_DEBUG("min threshold time=%d\n", min_threshold_us); + + if (min_threshold_us > frame_threshold_us) + frame_threshold_us = min_threshold_us; + timing->dsi_transfer_time_us = frame_time_us - frame_threshold_us; }