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drm/amdkfd: Fix SDMA ring buffer size calculation

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ffs function return the position of the first bit set on 1 based.
(bit zero returns 1).

Signed-off-by: shaoyun liu <shaoyun.liu@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Oded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
This commit is contained in:
shaoyunl 2017-11-01 19:21:56 -04:00 committed by Oded Gabbay
parent cf21654b40
commit d12fb13f23
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_cik.c
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@ -202,8 +202,8 @@ static int update_mqd_sdma(struct mqd_manager *mm, void *mqd,
struct cik_sdma_rlc_registers *m;
m = get_sdma_mqd(mqd);
m->sdma_rlc_rb_cntl = ffs(q->queue_size / sizeof(unsigned int)) <<
SDMA0_RLC0_RB_CNTL__RB_SIZE__SHIFT |
m->sdma_rlc_rb_cntl = (ffs(q->queue_size / sizeof(unsigned int)) - 1)
<< SDMA0_RLC0_RB_CNTL__RB_SIZE__SHIFT |
q->vmid << SDMA0_RLC0_RB_CNTL__RB_VMID__SHIFT |
1 << SDMA0_RLC0_RB_CNTL__RPTR_WRITEBACK_ENABLE__SHIFT |
6 << SDMA0_RLC0_RB_CNTL__RPTR_WRITEBACK_TIMER__SHIFT;