On Fri, Feb 05, 2021 at 02:42:05PM +0800, wanghongzhe wrote:
> 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@xxxxxxxxxx>
~~~~~~~~~~~
Firstname Lastname
Please write legit sentences starting with capital letters etc.
Please write the commit message in imperative form. E.g. "Do x because y
..". I presume that *you* are not an actor in the sequence.
You also would need to have a fixes tag and preferably some description
of the failing sequence if possible.
/Jarkko
> ---
> drivers/char/tpm/tpm_tis_spi_main.c | 12 +++++++++++-
> 1 file changed, 11 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/char/tpm/tpm_tis_spi_main.c b/drivers/char/tpm/tpm_tis_spi_main.c
> index 3856f6ebcb34..6c52cbb28881 100644
> --- a/drivers/char/tpm/tpm_tis_spi_main.c
> +++ b/drivers/char/tpm/tpm_tis_spi_main.c
> @@ -64,8 +64,18 @@ static int tpm_tis_spi_flow_control(struct tpm_tis_spi_phy *phy,
> break;
> }
>
> - if (i == TPM_RETRY)
> + if (i == TPM_RETRY) {
> + /* change back to 'high',
> + * So the TPM chips thinks the last communication
> + * is done.
> + */
> + 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;
> --
> 2.19.1
>
>
