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Commit d12fb13f authored by shaoyunl's avatar shaoyunl Committed by Oded Gabbay
Browse files

drm/amdkfd: Fix SDMA ring buffer size calculation 



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

Signed-off-by: default avatarshaoyun liu <shaoyun.liu@amd.com>
Signed-off-by: default avatarFelix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: default avatarOded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: default avatarOded Gabbay <oded.gabbay@gmail.com>
parent cf21654b

drivers/gpu/drm/amd/amdkfd/kfd_mqd_manager_cik.c

+2 −2
Original line number Diff line number Diff line
@@ -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;