Merge "disp: msm: dsi: update the threshold time based on panel jitter" (105e91a9) · Commits · e / devices / android_kernel_fairphone_FP5

msm/dsi/dsi_panel.c

+30 −0

Original line number	Diff line number	Diff line
		@@ -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;
		}