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SubjectRe: [PATCH 08/12] i2c: qup: change completion timeout according to transfer length
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On 2/3/2018 1:28 PM, Abhishek Sahu wrote:
> 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: Abhishek Sahu <absahu@codeaurora.org>
> ---
> drivers/i2c/busses/i2c-qup.c | 9 ++++++---
> 1 file changed, 6 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/i2c/busses/i2c-qup.c b/drivers/i2c/busses/i2c-qup.c
> index a91fc70..6df65ea 100644
> --- a/drivers/i2c/busses/i2c-qup.c
> +++ b/drivers/i2c/busses/i2c-qup.c
> @@ -130,8 +130,8 @@
> #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
> +/* Min timeout for i2c transfers */
> +#define TOUT_MIN 2
>

may be you can mention, why is this 2 ?

Regards,
Sricharan


> /* Default values. Use these if FW query fails */
> #define DEFAULT_CLK_FREQ 100000
> @@ -172,6 +172,7 @@ 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;
> @@ -845,7 +846,7 @@ 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;
> }
> @@ -1601,6 +1602,8 @@ static int qup_i2c_probe(struct platform_device *pdev)
> */
> 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,
>

--
"QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation

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