ipq40xx: backport I2C QUP driver changes from 4.17

Backport below changes for I2C QUP driver from v4.17:

  0668bc44a426 i2c: qup: fix copyrights and update to SPDX identifier
  7239872fb340 i2c: qup: fixed releasing dma without flush operation completion
  eb422b539c1f i2c: qup: minor code reorganization for use_dma
  6d5f37f166bb i2c: qup: remove redundant variables for BAM SG count
  c5adc0fa63a9 i2c: qup: schedule EOT and FLUSH tags at the end of transfer
  7e6c35fe602d i2c: qup: fix the transfer length for BAM RX EOT FLUSH tags
  3f450d3eea14 i2c: qup: proper error handling for i2c error in BAM mode
  08f15963bc75 i2c: qup: use the complete transfer length to choose DMA mode
  ecb6e1e5f435 i2c: qup: change completion timeout according to transfer length
  6f2f0f6465ac i2c: qup: fix buffer overflow for multiple msg of maximum xfer len
  f7714b4e451b i2c: qup: send NACK for last read sub transfers
  fbfab1ab0658 i2c: qup: reorganization of driver code to remove polling for qup v1
  7545c7dba169 i2c: qup: reorganization of driver code to remove polling for qup v2

This fixes various I2C issues observed on AP120C-AC board equipped with
Atmel/Microchip AT97SC3205T TPM module.

Tested-by: Christian Lamparter <chunkeey@gmail.com>
Signed-off-by: Piotr Dymacz <pepe2k@gmail.com>

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,