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disp: msm: dsi: update MDP/DSI transfer time calculation

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This change ensure that in cases panel transfer time is specified,
the final transfer time is calculated in accordance with the minimum
threshold time allowed.

Change-Id: I3442d4d3e8a27ec30d93725cb96b229bb94f2ce2
Signed-off-by: Satya Rama Aditya Pinapala <psraditya30@codeaurora.org>
This commit is contained in:
Satya Rama Aditya Pinapala
2020-06-18 04:09:56 -07:00
committed by Gerrit - the friendly Code Review server
parent b41ee8cf11
commit ab5d2638de
1 changed files with 25 additions and 22 deletions
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47
msm/dsi/dsi_panel.c
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@@ -3646,7 +3646,7 @@ void dsi_panel_calc_dsi_transfer_time(struct dsi_host_common_cfg *config,
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;
u32 min_threshold_us, prefill_time_us, max_transfer_us;
u16 bpp;
/* Packet overlead in bits,2 bytes header + 2 bytes checksum
@@ -3687,6 +3687,26 @@ void dsi_panel_calc_dsi_transfer_time(struct dsi_host_common_cfg *config,
timing->min_dsi_clk_hz = min_bitclk_hz;
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 64usec buffer time.
*/
min_threshold_us = min_threshold_us + 64 + prefill_time_us;
DSI_DEBUG("min threshold time=%d\n", min_threshold_us);
if (timing->clk_rate_hz) {
/* adjust the transfer time proportionately for bit clk*/
dsi_transfer_time_us = frame_time_us * min_bitclk_hz;
@@ -3694,30 +3714,13 @@ void dsi_panel_calc_dsi_transfer_time(struct dsi_host_common_cfg *config,
timing->dsi_transfer_time_us = dsi_transfer_time_us;
} else if (mode->priv_info->mdp_transfer_time_us) {
max_transfer_us = frame_time_us - min_threshold_us;
mode->priv_info->mdp_transfer_time_us = min(
mode->priv_info->mdp_transfer_time_us,
max_transfer_us);
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;