diff options
Diffstat (limited to 'target/linux/ipq40xx/patches-4.14/088-0009-i2c-qup-change-completion-timeout-according-to-trans.patch')
| -rw-r--r-- | target/linux/ipq40xx/patches-4.14/088-0009-i2c-qup-change-completion-timeout-according-to-trans.patch | 61 |
1 files changed, 61 insertions, 0 deletions
diff --git a/target/linux/ipq40xx/patches-4.14/088-0009-i2c-qup-change-completion-timeout-according-to-trans.patch b/target/linux/ipq40xx/patches-4.14/088-0009-i2c-qup-change-completion-timeout-according-to-trans.patch new file mode 100644 index 0000000000..c95d20ec97 --- /dev/null +++ b/target/linux/ipq40xx/patches-4.14/088-0009-i2c-qup-change-completion-timeout-according-to-trans.patch @@ -0,0 +1,61 @@ +From ecb6e1e5f4352055a5761b945a833a925d51bf8d Mon Sep 17 00:00:00 2001 +From: Abhishek Sahu <absahu@codeaurora.org> +Date: Mon, 12 Mar 2018 18:44:58 +0530 +Subject: [PATCH 09/13] 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: Abhishek Sahu <absahu@codeaurora.org> +Reviewed-by: Andy Gross <andy.gross@linaro.org> +Signed-off-by: Wolfram Sang <wsa@the-dreams.de> +--- + drivers/i2c/busses/i2c-qup.c | 13 ++++++++++--- + 1 file changed, 10 insertions(+), 3 deletions(-) + +--- a/drivers/i2c/busses/i2c-qup.c ++++ b/drivers/i2c/busses/i2c-qup.c +@@ -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 qu + 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, |