diff mbox series

tpm:tpm_tis_spi: set cs_change = 0 when timesout

Message ID 1579072164-23423-1-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. 15, 2020, 7:09 a.m. UTC 
From: Wang Hongzhe <wanghongzhe@huawei.com>

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: Wang Hongzhe <wanghongzhe@huawei.com>
---
 drivers/char/tpm/tpm_tis_spi.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)
diff mbox series

Patch

diff --git a/drivers/char/tpm/tpm_tis_spi.c b/drivers/char/tpm/tpm_tis_spi.c
index d1754fd..27e57bf 100644
--- a/drivers/char/tpm/tpm_tis_spi.c
+++ b/drivers/char/tpm/tpm_tis_spi.c
@@ -66,8 +66,15 @@  static int tpm_tis_spi_flow_control(struct tpm_tis_spi_phy *phy,
 				break;
 		}
 
-		if (i == TPM_RETRY)
+		if (i == TPM_RETRY) {
+			spi_xfer->len = 1;
+			spi_xfer->cs_change = 0;
+			spi_message_init(&m);
+			spi_message_add_tail(spi_xfer, &m);
+			if (ret < 0)
+				return ret;
 			return -ETIMEDOUT;
+		}
 	}
 
 	return 0;