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, 54 insertions, 0 deletions

diff --git a/target/linux/ipq40xx/patches-4.14/088-0008-i2c-qup-use-the-complete-transfer-length-to-choose-D.patch b/target/linux/ipq40xx/patches-4.14/088-0008-i2c-qup-use-the-complete-transfer-length-to-choose-D.patch
new file mode 100644
index 0000000000..3d68695588
--- /dev/null
+++ b/target/linux/ipq40xx/patches-4.14/088-0008-i2c-qup-use-the-complete-transfer-length-to-choose-D.patch
@@ -0,0 +1,54 @@
+From 08f15963bc751bc818294c0f75a9aaca299c4052 Mon Sep 17 00:00:00 2001
+From: Abhishek Sahu <absahu@codeaurora.org>
+Date: Mon, 12 Mar 2018 18:44:57 +0530
+Subject: [PATCH 08/13] i2c: qup: use the complete transfer length to choose
+ DMA mode
+
+Currently each message length in complete transfer is being
+checked for determining DMA mode and if any of the message length
+is less than FIFO length then non DMA mode is being used which
+will increase overhead. DMA can be used for any length and it
+should be determined with complete transfer length. Now, this
+patch selects DMA mode if the total length is greater than FIFO
+length.
+
+Signed-off-by: Abhishek Sahu <absahu@codeaurora.org>
+Reviewed-by: Austin Christ <austinwc@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, 7 insertions(+), 6 deletions(-)
+
+--- a/drivers/i2c/busses/i2c-qup.c
++++ b/drivers/i2c/busses/i2c-qup.c
+@@ -1300,7 +1300,8 @@ static int qup_i2c_xfer_v2(struct i2c_ad
+ 			   int num)
+ {
+ 	struct qup_i2c_dev *qup = i2c_get_adapdata(adap);
+-	int ret, len, idx = 0;
++	int ret, idx = 0;
++	unsigned int total_len = 0;
+ 
+ 	qup->bus_err = 0;
+ 	qup->qup_err = 0;
+@@ -1326,14 +1327,14 @@ static int qup_i2c_xfer_v2(struct i2c_ad
+ 				goto out;
+ 			}
+ 
+-			len = (msgs[idx].len > qup->out_fifo_sz) ||
+-			      (msgs[idx].len > qup->in_fifo_sz);
+-
+-			if (is_vmalloc_addr(msgs[idx].buf) || !len)
++			if (is_vmalloc_addr(msgs[idx].buf))
+ 				break;
++
++			total_len += msgs[idx].len;
+ 		}
+ 
+-		if (idx == num)
++		if (idx == num && (total_len > qup->out_fifo_sz ||
++				   total_len > qup->in_fifo_sz))
+ 			qup->use_dma = true;
+ 	}
+