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Diffstat (limited to 'drivers/misc/cxl/native.c')
| -rw-r--r-- | drivers/misc/cxl/native.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/misc/cxl/native.c b/drivers/misc/cxl/native.c index e77450567f69..04c27e41b654 100644 --- a/drivers/misc/cxl/native.c +++ b/drivers/misc/cxl/native.c @@ -55,6 +55,16 @@ static int afu_control(struct cxl_afu *afu, u64 command, u64 clear, cpu_relax(); AFU_Cntl = cxl_p2n_read(afu, CXL_AFU_Cntl_An); }; + + if (AFU_Cntl & CXL_AFU_Cntl_An_RA) { + /* + * Workaround for a bug in the XSL used in the Mellanox CX4 + * that fails to clear the RA bit after an AFU reset, + * preventing subsequent AFU resets from working. + */ + cxl_p2n_write(afu, CXL_AFU_Cntl_An, AFU_Cntl & ~CXL_AFU_Cntl_An_RA); + } + pr_devel("AFU command complete: %llx\n", command); afu->enabled = enabled; out: |