diff mbox series

tpm: tpm_tis_spi: set cs_change = 0 when timesout

Message ID 1579003951-16029-1-git-send-email-wanghongzhe@huawei.com (mailing list archive)
State New, archived
Headers show
Series tpm: tpm_tis_spi: set cs_change = 0 when timesout | expand

Commit Message

wanghongzhe Jan. 14, 2020, 12:12 p.m. UTC 
when i reach TPM_RETRY, the cs cannot  change back to 'high'.So the TPM chips thinks this communication is not over. 
And next times communication cannot be effective because the communications mixed up with the last time.

Signed-off-by: wanghongzhe <wanghongzhe@huawei.com>
---
 drivers/char/tpm/tpm_tis_spi.c | 7 +++++++
 1 file changed, 7 insertions(+)
diff mbox series

Patch

diff --git a/drivers/char/tpm/tpm_tis_spi.c b/drivers/char/tpm/tpm_tis_spi.c
index d1754fd..a1ae4f6 100644
--- a/drivers/char/tpm/tpm_tis_spi.c
+++ b/drivers/char/tpm/tpm_tis_spi.c
@@ -67,7 +67,14 @@  static int tpm_tis_spi_flow_control(struct tpm_tis_spi_phy *phy,
 		}
 
 		if (i == TPM_RETRY)
+        {
+            spi_xfer.cs_change = 0;
+            spi_xfer->len = 1;
+            spi_message_init(&m);
+            spi_message_add_tail(spi_xfer, &m);
+            ret = spi_sync_locked(phy->spi_device, &m);
 			return -ETIMEDOUT;
+        }
 	}
 
 	return 0;