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, 76 insertions, 0 deletions

diff --git a/target/linux/ipq40xx/patches-4.14/088-0003-i2c-qup-minor-code-reorganization-for-use_dma.patch b/target/linux/ipq40xx/patches-4.14/088-0003-i2c-qup-minor-code-reorganization-for-use_dma.patch
new file mode 100644
index 0000000000..a6cbfcf2b0
--- /dev/null
+++ b/target/linux/ipq40xx/patches-4.14/088-0003-i2c-qup-minor-code-reorganization-for-use_dma.patch
@@ -0,0 +1,76 @@
+From eb422b539c1f39faf576826b54be93e84d9cb32a Mon Sep 17 00:00:00 2001
+From: Abhishek Sahu <absahu@codeaurora.org>
+Date: Mon, 12 Mar 2018 18:44:52 +0530
+Subject: [PATCH 03/13] i2c: qup: minor code reorganization for use_dma
+
+1. Assigns use_dma in qup_dev structure itself which will
+   help in subsequent patches to determine the mode in IRQ handler.
+2. Does minor code reorganization for loops to reduce the
+   unnecessary comparison and assignment.
+
+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 | 19 +++++++++++--------
+ 1 file changed, 11 insertions(+), 8 deletions(-)
+
+--- a/drivers/i2c/busses/i2c-qup.c
++++ b/drivers/i2c/busses/i2c-qup.c
+@@ -181,6 +181,8 @@ struct qup_i2c_dev {
+ 
+ 	/* dma parameters */
+ 	bool			is_dma;
++	/* To check if the current transfer is using DMA */
++	bool			use_dma;
+ 	struct			dma_pool *dpool;
+ 	struct			qup_i2c_tag start_tag;
+ 	struct			qup_i2c_bam brx;
+@@ -1288,7 +1290,7 @@ 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, use_dma = 0;
++	int ret, len, idx = 0;
+ 
+ 	qup->bus_err = 0;
+ 	qup->qup_err = 0;
+@@ -1317,13 +1319,12 @@ static int qup_i2c_xfer_v2(struct i2c_ad
+ 			len = (msgs[idx].len > qup->out_fifo_sz) ||
+ 			      (msgs[idx].len > qup->in_fifo_sz);
+ 
+-			if ((!is_vmalloc_addr(msgs[idx].buf)) && len) {
+-				use_dma = 1;
+-			 } else {
+-				use_dma = 0;
++			if (is_vmalloc_addr(msgs[idx].buf) || !len)
+ 				break;
+-			}
+ 		}
++
++		if (idx == num)
++			qup->use_dma = true;
+ 	}
+ 
+ 	idx = 0;
+@@ -1347,15 +1348,17 @@ static int qup_i2c_xfer_v2(struct i2c_ad
+ 
+ 		reinit_completion(&qup->xfer);
+ 
+-		if (use_dma) {
++		if (qup->use_dma) {
+ 			ret = qup_i2c_bam_xfer(adap, &msgs[idx], num);
++			qup->use_dma = false;
++			break;
+ 		} else {
+ 			if (msgs[idx].flags & I2C_M_RD)
+ 				ret = qup_i2c_read_one_v2(qup, &msgs[idx]);
+ 			else
+ 				ret = qup_i2c_write_one_v2(qup, &msgs[idx]);
+ 		}
+-	} while ((idx++ < (num - 1)) && !use_dma && !ret);
++	} while ((idx++ < (num - 1)) && !ret);
+ 
+ 	if (!ret)
+ 		ret = qup_i2c_change_state(qup, QUP_RESET_STATE);