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| author |   Alvin Lee <Alvin.Lee2@amd.com> | 2022-08-04 14:42:47 -0400 |
|---|---|---|
| committer |   Alex Deucher <alexander.deucher@amd.com> | 2022-08-16 18:14:20 -0400 |
| commit | fbe43dcd1aad7dbcee1cffdbe6c3e1d62c85f76a (patch) | |
| tree | 965b7468616495eab96041d2e0494a16dd0b5c4d /drivers/gpu/drm/amd/display/dc/basics | |
| parent | drm/amdgpu/vcn: Return void from the stop_dbg_mode (diff) | |
| download | linux-dev-fbe43dcd1aad7dbcee1cffdbe6c3e1d62c85f76a.tar.xz linux-dev-fbe43dcd1aad7dbcee1cffdbe6c3e1d62c85f76a.zip | |
drm/amd/display: Include scaling factor for SubVP command
[Description]
For SubVP scaling cases, we must include the scaling
info as part of the cmd. This is required when converting
OTG line to HUBP line for the MALL_START_LINE programming.
Reviewed-by: Jun Lei <Jun.Lei@amd.com>
Acked-by: Brian Chang <Brian.Chang@amd.com>
Signed-off-by: Alvin Lee <Alvin.Lee2@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/amd/display/dc/basics')
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/basics/conversion.c | 21 | ||||
| -rw-r--r-- | drivers/gpu/drm/amd/display/dc/basics/conversion.h | 3 |
2 files changed, 24 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/display/dc/basics/conversion.c b/drivers/gpu/drm/amd/display/dc/basics/conversion.c index 6767fab55c26..352e9afb85c6 100644 --- a/drivers/gpu/drm/amd/display/dc/basics/conversion.c +++ b/drivers/gpu/drm/amd/display/dc/basics/conversion.c @@ -100,3 +100,24 @@ void convert_float_matrix( matrix[i] = (uint16_t)reg_value; } } + +static uint32_t find_gcd(uint32_t a, uint32_t b) +{ + uint32_t remainder = 0; + while (b != 0) { + remainder = a % b; + a = b; + b = remainder; + } + return a; +} + +void reduce_fraction(uint32_t num, uint32_t den, + uint32_t *out_num, uint32_t *out_den) +{ + uint32_t gcd = 0; + + gcd = find_gcd(num, den); + *out_num = num / gcd; + *out_den = den / gcd; +} diff --git a/drivers/gpu/drm/amd/display/dc/basics/conversion.h b/drivers/gpu/drm/amd/display/dc/basics/conversion.h index ade785c4fdc7..81da4e6f7a1a 100644 --- a/drivers/gpu/drm/amd/display/dc/basics/conversion.h +++ b/drivers/gpu/drm/amd/display/dc/basics/conversion.h @@ -38,6 +38,9 @@ void convert_float_matrix( struct fixed31_32 *flt, uint32_t buffer_size); +void reduce_fraction(uint32_t num, uint32_t den, + uint32_t *out_num, uint32_t *out_den); + static inline unsigned int log_2(unsigned int num) { return ilog2(num); |