linux-kernel - [PATCH] spi: core: Increase timeout value

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Message-Id: <1397134229-2380-1-git-send-email-harinik@xilinx.com>
Date:	Thu, 10 Apr 2014 18:20:29 +0530
From:	Harini Katakam <harinik@...inx.com>
To:	broonie@...nel.org, linux-spi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc:	michals@...inx.com, Harini Katakam <harinik@...inx.com>
Subject: [PATCH] spi: core: Increase timeout value

The existing timeout value in wait_for_completion_timeout is
calculated from the transfer length and speed with tolerance of 10msec.
This is too low because this is used for error conditions such as
hardware hang etc.
The xfer->speed_hz considered may not be the actual speed set
because the best clock divisor is chosen from a limited set such that
the actual speed <= requested speed. This will lead to timeout being
less than actual transfer time.
Considering acceptable latencies, this timeout can be set to a large
value >= 1*HZ typically.
This patch adds a tolerance of 2000 msec in the core accordingly.

Signed-off-by: Harini Katakam <harinik@...inx.com>
---
 drivers/spi/spi.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 4eb9bf0..3fdecfa 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -775,7 +775,7 @@ static int spi_transfer_one_message(struct spi_master *master,
 		if (ret > 0) {
 			ret = 0;
 			ms = xfer->len * 8 * 1000 / xfer->speed_hz;
-			ms += 10; /* some tolerance */
+			ms += 2000; /* some tolerance */

 			ms = wait_for_completion_timeout(&master->xfer_completion,
 							 msecs_to_jiffies(ms));
-- 
1.7.9.5

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