[PATCH] tpm: tpm_tis_spi: set cs_change = 0 when timesout

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



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@xxxxxxxxxx>
---
 drivers/char/tpm/tpm_tis_spi.c | 7 +++++++
 1 file changed, 7 insertions(+)

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;
--
1.7.12.4




[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Index of Archives]     [Linux Kernel]     [Linux Kernel Hardening]     [Linux NFS]     [Linux NILFS]     [Linux USB Devel]     [Video for Linux]     [Linux Audio Users]     [Yosemite News]     [Linux SCSI]

  Powered by Linux