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drm/i915/dsc: Use helper to calculate range_bpg_offset

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We get range_bpg_offset for different bpps based on
linear-interpolation from values given for nearby bpps.
Use a helper to get these values.

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@intel.com>
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Krzysztof Karas <krzysztof.karas@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250110044131.3162682-2-ankit.k.nautiyal@intel.com
This commit is contained in:
Ankit Nautiyal 2025-01-10 10:11:30 +05:30
parent 605a33e765
commit 3abe2824e1
1 changed files with 30 additions and 29 deletions
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59
drivers/gpu/drm/i915/display/intel_vdsc.c
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@ -66,6 +66,13 @@ intel_vdsc_set_min_max_qp(struct drm_dsc_config *vdsc_cfg, int buf,
intel_lookup_range_max_qp(bpc, buf, bpp, vdsc_cfg->native_420);
}
static int
get_range_bpg_offset(int bpp_low, int offset_low, int bpp_high, int offset_high, int bpp)
{
return offset_low + DIV_ROUND_UP((offset_high - offset_low) * (bpp - bpp_low),
(bpp_low - bpp_high));
}
/*
* We are using the method provided in DSC 1.2a C-Model in codec_main.c
* Above method use a common formula to derive values for any combination of DSC
@ -83,7 +90,7 @@ calculate_rc_params(struct drm_dsc_config *vdsc_cfg)
int qp_bpc_modifier = (bpc - 8) * 2;
int uncompressed_bpg_rate;
int first_line_bpg_offset;
u32 res, buf_i, bpp_i;
u32 buf_i, bpp_i;
if (vdsc_cfg->slice_height >= 8)
first_line_bpg_offset =
@ -163,23 +170,19 @@ calculate_rc_params(struct drm_dsc_config *vdsc_cfg)
intel_vdsc_set_min_max_qp(vdsc_cfg, buf_i, bpp_i);
/* Calculate range_bpg_offset */
if (bpp <= 8) {
if (bpp <= 8)
range_bpg_offset = ofs_und4[buf_i];
} else if (bpp <= 10) {
res = DIV_ROUND_UP(((bpp - 8) *
(ofs_und5[buf_i] - ofs_und4[buf_i])), 2);
range_bpg_offset = ofs_und4[buf_i] + res;
} else if (bpp <= 12) {
res = DIV_ROUND_UP(((bpp - 10) *
(ofs_und6[buf_i] - ofs_und5[buf_i])), 2);
range_bpg_offset = ofs_und5[buf_i] + res;
} else if (bpp <= 16) {
res = DIV_ROUND_UP(((bpp - 12) *
(ofs_und8[buf_i] - ofs_und6[buf_i])), 4);
range_bpg_offset = ofs_und6[buf_i] + res;
} else {
else if (bpp <= 10)
range_bpg_offset = get_range_bpg_offset(8, ofs_und4[buf_i],
10, ofs_und5[buf_i], bpp);
else if (bpp <= 12)
range_bpg_offset = get_range_bpg_offset(10, ofs_und5[buf_i],
12, ofs_und6[buf_i], bpp);
else if (bpp <= 16)
range_bpg_offset = get_range_bpg_offset(12, ofs_und6[buf_i],
16, ofs_und8[buf_i], bpp);
else
range_bpg_offset = ofs_und8[buf_i];
}
vdsc_cfg->rc_range_params[buf_i].range_bpg_offset =
range_bpg_offset & DSC_RANGE_BPG_OFFSET_MASK;
@ -215,21 +218,19 @@ calculate_rc_params(struct drm_dsc_config *vdsc_cfg)
intel_vdsc_set_min_max_qp(vdsc_cfg, buf_i, bpp_i);
/* Calculate range_bpg_offset */
if (bpp <= 6) {
if (bpp <= 6)
range_bpg_offset = ofs_und6[buf_i];
} else if (bpp <= 8) {
res = DIV_ROUND_UP(((bpp - 6) *
(ofs_und8[buf_i] - ofs_und6[buf_i])), 2);
range_bpg_offset = ofs_und6[buf_i] + res;
} else if (bpp <= 12) {
range_bpg_offset = ofs_und8[buf_i];
} else if (bpp <= 15) {
res = DIV_ROUND_UP(((bpp - 12) *
(ofs_und15[buf_i] - ofs_und12[buf_i])), 3);
range_bpg_offset = ofs_und12[buf_i] + res;
} else {
else if (bpp <= 8)
range_bpg_offset = get_range_bpg_offset(6, ofs_und6[buf_i],
8, ofs_und8[buf_i], bpp);
else if (bpp <= 12)
range_bpg_offset = get_range_bpg_offset(8, ofs_und8[buf_i],
12, ofs_und12[buf_i], bpp);
else if (bpp <= 15)
range_bpg_offset = get_range_bpg_offset(12, ofs_und12[buf_i],
15, ofs_und15[buf_i], bpp);
else
range_bpg_offset = ofs_und15[buf_i];
}
vdsc_cfg->rc_range_params[buf_i].range_bpg_offset =
range_bpg_offset & DSC_RANGE_BPG_OFFSET_MASK;