diff options
| author | Ilya Bakoulin <ilya.bakoulin@amd.com> | 2023-12-01 16:25:06 +0300 |
|---|---|---|
| committer | Alex Deucher <alexander.deucher@amd.com> | 2023-12-06 23:22:33 +0300 |
| commit | 94bbf802efd0a8f13147d6664af6e653637340a8 (patch) | |
| tree | c9423dd6f270f1d46d5835f4d9d3c2f5157aa1d8 | |
| parent | 23cf5a5cd33a518b6bdbe9966dc49f1cf6bfe532 (diff) | |
| download | linux-94bbf802efd0a8f13147d6664af6e653637340a8.tar.xz | |
drm/amd/display: Fix MST PBN/X.Y value calculations
Changing PBN calculation to be more in line with spec. We don't need to
inflate PBN_NATIVE value by the 1.006 margin, since that is already
taken care of in the get_pbn_per_slot function.
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Reviewed-by: Wenjing Liu <wenjing.liu@amd.com>
Acked-by: Rodrigo Siqueira <rodrigo.siqueira@amd.com>
Signed-off-by: Ilya Bakoulin <ilya.bakoulin@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/link/link_dpms.c | 13 |
1 files changed, 8 insertions, 5 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/link/link_dpms.c b/drivers/gpu/drm/amd/display/dc/link/link_dpms.c index aa0a086aa7fc..b16b2e14312e 100644 --- a/drivers/gpu/drm/amd/display/dc/link/link_dpms.c +++ b/drivers/gpu/drm/amd/display/dc/link/link_dpms.c @@ -1057,18 +1057,21 @@ static struct fixed31_32 get_pbn_from_bw_in_kbps(uint64_t kbps) uint32_t denominator = 1; /* - * margin 5300ppm + 300ppm ~ 0.6% as per spec, factor is 1.006 + * The 1.006 factor (margin 5300ppm + 300ppm ~ 0.6% as per spec) is not + * required when determining PBN/time slot utilization on the link between + * us and the branch, since that overhead is already accounted for in + * the get_pbn_per_slot function. + * * The unit of 54/64Mbytes/sec is an arbitrary unit chosen based on * common multiplier to render an integer PBN for all link rate/lane * counts combinations * calculate - * peak_kbps *= (1006/1000) * peak_kbps *= (64/54) - * peak_kbps *= 8 convert to bytes + * peak_kbps /= (8 * 1000) convert to bytes */ - numerator = 64 * PEAK_FACTOR_X1000; - denominator = 54 * 8 * 1000 * 1000; + numerator = 64; + denominator = 54 * 8 * 1000; kbps *= numerator; peak_kbps = dc_fixpt_from_fraction(kbps, denominator); |