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msm: vidc: Modify DCVS scaling window

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DCVS scaling window should be equal to the additional buffers
allocated for DCVS and independent of the buffer count required
by Client and FW.

CRs-Fixed: 2527739
Change-Id: I665a3d9792f44ea031d6c8d05d6e7a546a22f9a8
Signed-off-by: Chinmay Sawarkar <chinmays@codeaurora.org>
This commit is contained in:
Chinmay Sawarkar 2019-09-27 11:18:57 -07:00 • committed by Gerrit - the friendly Code Review server
commit 85b4a06821
1 changed files with 18 additions and 16 deletions
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34
msm/vidc/msm_vidc_clocks.c
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@ -450,26 +450,27 @@ static int msm_dcvs_scale_clocks(struct msm_vidc_inst *inst,
* Limits :
* min_threshold : Buffers required for reference by FW.
* nom_threshold : Midpoint of Min and Max thresholds
* max_threshold : Total - Client extra buffers, allocated
* for it's smooth flow.
* max_threshold : Min Threshold + DCVS extra buffers, allocated
* for smooth flow.
* 1) When buffers outside FW are reaching client's extra buffers,
* FW is slow and will impact pipeline, Increase clock.
* 2) When pending buffers with FW are same as FW requested,
* 2) When pending buffers with FW are less than FW requested,
* pipeline has cushion to absorb FW slowness, Decrease clocks.
* 3) When buffers are equally distributed between FW and Client
* switch to NOM as this is the ideal steady state.
* 3) When DCVS has engaged(Inc or Dec) and pending buffers with FW
* transitions past the nom_threshold, switch to calculated load.
* This smoothens the clock transitions.
* 4) Otherwise maintain previous Load config.
*/
if (dcvs->dcvs_window < DCVS_DEC_EXTRA_OUTPUT_BUFFERS ||
bufs_with_fw == dcvs->nom_threshold) {
dcvs->dcvs_flags = 0;
} else if (bufs_with_fw >= dcvs->max_threshold) {
dcvs->dcvs_flags |= MSM_VIDC_DCVS_INCR;
if (bufs_with_fw >= dcvs->max_threshold) {
dcvs->dcvs_flags = MSM_VIDC_DCVS_INCR;
} else if (bufs_with_fw < dcvs->min_threshold) {
dcvs->dcvs_flags |= MSM_VIDC_DCVS_DECR;
}
dcvs->dcvs_flags = MSM_VIDC_DCVS_DECR;
} else if ((dcvs->dcvs_flags & MSM_VIDC_DCVS_DECR &&
bufs_with_fw >= dcvs->nom_threshold) ||
(dcvs->dcvs_flags & MSM_VIDC_DCVS_INCR &&
bufs_with_fw <= dcvs->nom_threshold))
dcvs->dcvs_flags = 0;
s_vpr_p(inst->sid, "DCVS: bufs_with_fw %d Th[%d %d %d] Flag %#x\n",
bufs_with_fw, dcvs->min_threshold,
@ -995,11 +996,12 @@ void msm_clock_data_reset(struct msm_vidc_inst *inst)
dcvs->min_threshold = fmt->count_min;
dcvs->max_threshold =
max(fmt->count_min,
(fmt->count_actual - DCVS_DEC_EXTRA_OUTPUT_BUFFERS));
min((fmt->count_min + DCVS_DEC_EXTRA_OUTPUT_BUFFERS),
fmt->count_actual);
dcvs->dcvs_window =
dcvs->max_threshold - dcvs->min_threshold;
dcvs->max_threshold < dcvs->min_threshold ? 0 :
dcvs->max_threshold - dcvs->min_threshold;
dcvs->nom_threshold = dcvs->min_threshold +
(dcvs->dcvs_window ?
(dcvs->dcvs_window / 2) : 0);