From 24de7c29e5f70863a2962de79521b60bce4dce2f Mon Sep 17 00:00:00 2001 From: Piotr Dymacz Date: Sun, 3 Mar 2019 20:23:31 +0100 Subject: 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 Signed-off-by: Piotr Dymacz --- ...nge-completion-timeout-according-to-trans.patch | 61 ++++++++++++++++++++++ 1 file changed, 61 insertions(+) create mode 100644 target/linux/ipq40xx/patches-4.14/088-0009-i2c-qup-change-completion-timeout-according-to-trans.patch (limited to 'target/linux/ipq40xx/patches-4.14/088-0009-i2c-qup-change-completion-timeout-according-to-trans.patch') 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 +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 +Reviewed-by: Andy Gross +Signed-off-by: Wolfram Sang +--- + 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, -- cgit v1.2.3