# \[PATCH\] crypto: hisilicon/sec - fix the process of disabling sva prefetching

- From: Kai Ye \<hidden\>
- Date: 2021-06-26 02:51:05 
- List: linux-crypto
- Page: https://ratatoskr.run/linux-crypto/2021/06/1426473
- Thread: https://ratatoskr.run/linux-crypto/2021/06/1426473/t.md

```text
The open interface of the sva prefetching function is distinguish the chip
version. But the close interface of the sva prefetching function doesn't
distinguish the chip version. As a result, the sva prefetching close
operation is also performed on Kunpeng920, those registers are important
on Kunpeng920, which eventually leads to abnormal hardware problems. So
need to fix it immediately.

Signed-off-by: Kai Ye <redacted>
---
 drivers/crypto/hisilicon/sec2/sec_main.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/crypto/hisilicon/sec2/sec_main.c b/drivers/crypto/hisilicon/sec2/sec_main.c
index 8ab4e67..710ea8d 100644
--- a/drivers/crypto/hisilicon/sec2/sec_main.c
+++ b/drivers/crypto/hisilicon/sec2/sec_main.c
@@ -363,6 +363,9 @@ static void sec_close_sva_prefetch(struct hisi_qm *qm)
 	u32 val;
 	int ret;
 
+	if (qm->ver < QM_HW_V3)
+		return;
+
 	val = readl_relaxed(qm->io_base + SEC_PREFETCH_CFG);
 	val |= SEC_PREFETCH_DISABLE;
 	writel(val, qm->io_base + SEC_PREFETCH_CFG);
-- 
2.7.4

```