Commit ecb6e1e5 authored by Abhishek Sahu's avatar Abhishek Sahu Committed by Wolfram Sang
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i2c: qup: change completion timeout according to transfer length 



Currently the completion timeout is being taken according to
maximum transfer length which is too high if SCL is operating in
high frequency. This patch calculates timeout on the basis of
one-byte transfer time and uses the same for completion timeout.

Signed-off-by: default avatarAbhishek Sahu <absahu@codeaurora.org>
Reviewed-by: default avatarAndy Gross <andy.gross@linaro.org>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent 08f15963

drivers/i2c/busses/i2c-qup.c

+10 −3
Original line number Diff line number Diff line
@@ -121,8 +121,12 @@ 
#define MX_TX_RX_LEN			SZ_64K

#define MX_BLOCKS			(MX_TX_RX_LEN / QUP_READ_LIMIT)



/* Max timeout in ms for 32k bytes */

#define TOUT_MAX			300

/*

 * Minimum transfer timeout for i2c transfers in seconds. It will be added on

 * the top of maximum transfer time calculated from i2c bus speed to compensate

 * the overheads.

 */

#define TOUT_MIN			2



/* Default values. Use these if FW query fails */

#define DEFAULT_CLK_FREQ 100000
@@ -163,6 +167,7 @@ struct qup_i2c_dev { 
	int			in_blk_sz;



	unsigned long		one_byte_t;

	unsigned long		xfer_timeout;

	struct qup_i2c_block	blk;



	struct i2c_msg		*msg;
@@ -849,7 +854,7 @@ static int qup_i2c_bam_do_xfer(struct qup_i2c_dev *qup, struct i2c_msg *msg, 
		dma_async_issue_pending(qup->brx.dma);

	}



	if (!wait_for_completion_timeout(&qup->xfer, TOUT_MAX * HZ)) {

	if (!wait_for_completion_timeout(&qup->xfer, qup->xfer_timeout)) {

		dev_err(qup->dev, "normal trans timed out\n");

		ret = -ETIMEDOUT;

	}
@@ -1605,6 +1610,8 @@ nodma: 
	 */

	one_bit_t = (USEC_PER_SEC / clk_freq) + 1;

	qup->one_byte_t = one_bit_t * 9;

	qup->xfer_timeout = TOUT_MIN * HZ +

			    usecs_to_jiffies(MX_TX_RX_LEN * qup->one_byte_t);



	dev_dbg(qup->dev, "IN:block:%d, fifo:%d, OUT:block:%d, fifo:%d\n",

		qup->in_blk_sz, qup->in_fifo_sz,

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