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drm/amdgpu: adjust register address calculation

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the UMC_STATUS register is not linear, adjust offset
calculation formula to get correct address

Signed-off-by: Stanley.Yang <Stanley.Yang@amd.com>
Reviewed-by: Tao Zhou <tao.zhou1@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Stanley.Yang 2022-02-11 17:35:18 +08:00 • committed by Alex Deucher
parent f3986e86b2
commit 1915a43395
1 changed files with 7 additions and 0 deletions
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7
drivers/gpu/drm/amd/amdgpu/umc_v6_7.c
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@ -47,6 +47,13 @@ static inline uint32_t get_umc_v6_7_reg_offset(struct amdgpu_device *adev,
uint32_t umc_inst,
uint32_t ch_inst)
{
uint32_t index = umc_inst * adev->umc.channel_inst_num + ch_inst;
/* adjust umc and channel index offset,
* the register address is not linear on each umc instace */
umc_inst = index / 4;
ch_inst = index % 4;
return adev->umc.channel_offs * ch_inst + UMC_V6_7_INST_DIST * umc_inst;
}