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authorLuo Jiaxing <luojiaxing@huawei.com>2020-05-15 17:13:43 +0300
committerMartin K. Petersen <martin.petersen@oracle.com>2020-05-20 04:23:58 +0300
commit1e954d1f002db802937deb87a868c3f62fe1badf (patch)
tree34b7148e227d31974e649bb3a18abbcabed5bf63 /drivers/scsi/hisi_sas
parente16b9ed61e078d836a0f24a82080cf29d7539c7e (diff)
downloadlinux-1e954d1f002db802937deb87a868c3f62fe1badf.tar.xz
scsi: hisi_sas: Modify the commit information for DSM method
Make it clear that BIOS may modify some register settings. Link: https://lore.kernel.org/r/1589552025-165012-3-git-send-email-john.garry@huawei.com Signed-off-by: Luo Jiaxing <luojiaxing@huawei.com> Signed-off-by: John Garry <john.garry@huawei.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/hisi_sas')
-rw-r--r--drivers/scsi/hisi_sas/hisi_sas_v3_hw.c8
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
index 59b1421607dd..edab8383b485 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
@@ -912,11 +912,15 @@ static int hw_init_v3_hw(struct hisi_hba *hisi_hba)
return -EINVAL;
}
- /* Switch over to MSI handling , from PCI AER default */
+ /*
+ * This DSM handles some hardware-related configurations:
+ * 1. Switch over to MSI error handling in kernel
+ * 2. BIOS *may* reset some register values through this method
+ */
obj = acpi_evaluate_dsm(ACPI_HANDLE(dev), &guid, 0,
DSM_FUNC_ERR_HANDLE_MSI, NULL);
if (!obj)
- dev_warn(dev, "Switch over to MSI handling failed\n");
+ dev_warn(dev, "can not find DSM method, ignore\n");
else
ACPI_FREE(obj);