mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-29 18:19:02 +00:00
62 lines
2.0 KiB
Diff
62 lines
2.0 KiB
Diff
|
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,
|