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, 44 insertions, 0 deletions

diff --git a/target/linux/ipq40xx/patches-4.14/088-0002-i2c-qup-fixed-releasing-dma-without-flush-operation.patch b/target/linux/ipq40xx/patches-4.14/088-0002-i2c-qup-fixed-releasing-dma-without-flush-operation.patch
new file mode 100644
index 0000000000..25d0366ec6
--- /dev/null
+++ b/target/linux/ipq40xx/patches-4.14/088-0002-i2c-qup-fixed-releasing-dma-without-flush-operation.patch
@@ -0,0 +1,44 @@
+From 7239872fb3400b21a8f5547257f9f86455867bd6 Mon Sep 17 00:00:00 2001
+From: Abhishek Sahu <absahu@codeaurora.org>
+Date: Mon, 12 Mar 2018 18:44:51 +0530
+Subject: [PATCH 02/13] i2c: qup: fixed releasing dma without flush operation
+ completion
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+The QUP BSLP BAM generates the following error sometimes if the
+current I2C DMA transfer fails and the flush operation has been
+scheduled
+
+    “bam-dma-engine 7884000.dma: Cannot free busy channel”
+
+If any I2C error comes during BAM DMA transfer, then the QUP I2C
+interrupt will be generated and the flush operation will be
+carried out to make I2C consume all scheduled DMA transfer.
+Currently, the same completion structure is being used for BAM
+transfer which has already completed without reinit. It will make
+flush operation wait_for_completion_timeout completed immediately
+and will proceed for freeing the DMA resources where the
+descriptors are still in process.
+
+Signed-off-by: Abhishek Sahu <absahu@codeaurora.org>
+Acked-by: Sricharan R <sricharan@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 | 2 ++
+ 1 file changed, 2 insertions(+)
+
+--- a/drivers/i2c/busses/i2c-qup.c
++++ b/drivers/i2c/busses/i2c-qup.c
+@@ -835,6 +835,8 @@ static int qup_i2c_bam_do_xfer(struct qu
+ 	}
+ 
+ 	if (ret || qup->bus_err || qup->qup_err) {
++		reinit_completion(&qup->xfer);
++
+ 		if (qup_i2c_change_state(qup, QUP_RUN_STATE)) {
+ 			dev_err(qup->dev, "change to run state timed out");
+ 			goto desc_err;