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crypto: ccp - reduce tee command status polling interval from 5ms to 1ms

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The PSP TEE device driver polls the command status variable every
5ms to check for command completion. Reduce this time to 1ms so that
there is an improvement in driver response time to clients which submit
TEE commands.

Reviewed-by: Devaraj Rangasamy <Devaraj.Rangasamy@amd.com>
Signed-off-by: Rijo Thomas <Rijo-john.Thomas@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Rijo Thomas 2021-03-15 13:55:28 +05:30 committed by Herbert Xu
parent e656459b57
commit 4a5eed1734
1 changed files with 4 additions and 4 deletions
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8
drivers/crypto/ccp/tee-dev.c
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@ -5,7 +5,7 @@
* Author: Rijo Thomas <Rijo-john.Thomas@amd.com>
* Author: Devaraj Rangasamy <Devaraj.Rangasamy@amd.com>
*
* Copyright 2019 Advanced Micro Devices, Inc.
* Copyright (C) 2019,2021 Advanced Micro Devices, Inc.
*/
#include <linux/types.h>
@ -309,14 +309,14 @@ static int tee_wait_cmd_completion(struct psp_tee_device *tee,
struct tee_ring_cmd *resp,
unsigned int timeout)
{
/* ~5ms sleep per loop => nloop = timeout * 200 */
int nloop = timeout * 200;
/* ~1ms sleep per loop => nloop = timeout * 1000 */
int nloop = timeout * 1000;
while (--nloop) {
if (resp->cmd_state == TEE_CMD_STATE_COMPLETED)
return 0;
usleep_range(5000, 5100);
usleep_range(1000, 1100);
}
dev_err(tee->dev, "tee: command 0x%x timed out, disabling PSP\n",