On Fri, Sep 15, 2017 at 06:07:26PM +0530, Nayna Jain wrote:

On 09/13/2017 06:28 AM, Jarkko Sakkinen wrote:

quoted

On Wed, Sep 06, 2017 at 08:56:37AM -0400, Nayna Jain wrote:

quoted

The existing wait_for_tpm_stat() checks the chip status before
sleeping for 5 msec in a polling loop.  For some functions although
the status isn't ready immediately, the status returns extremely
quickly. Waiting for 5 msec causes an unnecessary delay. An
example is the send() call in the tpms_tis driver.

This patch defines __wait_for_tpm_stat(), allowing the caller
to specify the polling sleep timeout value within the loop.
The existing wait_for_tpm_stat() becomes a wrapper for this
function.

After this change, performance on a TPM 1.2 with an 8 byte
burstcount for 1000 extends improved from ~14sec to ~10sec.

Signed-off-by: Nayna Jain <redacted>
Acked-by: Mimi Zohar <redacted>

Please get rid of wait_for_tpm_stat() rather than further making it more
complex. It's hardware specific stuff. This function should not exist in
tpm-interface.c.

I think I didn't understand the meaning of "get rid of wait_for_tpm_stat()".
Do you mean to take care of it in driver specific file ?
Can you please elaborate it ?

Thanks & Regards,
??? - Nayna

It's not a generic function. It's used only in tpm_tis and tpm-xenfront.
They should have their owen private functions for this. Here the sharing
of code makes zero sense.

/Jarkko
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