From 1e954d1f002db802937deb87a868c3f62fe1badf Mon Sep 17 00:00:00 2001 From: Luo Jiaxing Date: Fri, 15 May 2020 22:13:43 +0800 Subject: [PATCH] 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 Signed-off-by: John Garry Signed-off-by: Martin K. Petersen --- drivers/scsi/hisi_sas/hisi_sas_v3_hw.c | 8 ++++++-- 1 file 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 59b1421607dd3..edab8383b485c 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); -- 2.30.2