24de7c29e5
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>
45 lines
1.6 KiB
Diff
45 lines
1.6 KiB
Diff
From 7239872fb3400b21a8f5547257f9f86455867bd6 Mon Sep 17 00:00:00 2001
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From: Abhishek Sahu <absahu@codeaurora.org>
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Date: Mon, 12 Mar 2018 18:44:51 +0530
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Subject: [PATCH 02/13] i2c: qup: fixed releasing dma without flush operation
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completion
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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The QUP BSLP BAM generates the following error sometimes if the
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current I2C DMA transfer fails and the flush operation has been
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scheduled
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“bam-dma-engine 7884000.dma: Cannot free busy channel”
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If any I2C error comes during BAM DMA transfer, then the QUP I2C
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interrupt will be generated and the flush operation will be
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carried out to make I2C consume all scheduled DMA transfer.
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Currently, the same completion structure is being used for BAM
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transfer which has already completed without reinit. It will make
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flush operation wait_for_completion_timeout completed immediately
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and will proceed for freeing the DMA resources where the
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descriptors are still in process.
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Signed-off-by: Abhishek Sahu <absahu@codeaurora.org>
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Acked-by: Sricharan R <sricharan@codeaurora.org>
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Reviewed-by: Austin Christ <austinwc@codeaurora.org>
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Reviewed-by: Andy Gross <andy.gross@linaro.org>
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Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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---
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drivers/i2c/busses/i2c-qup.c | 2 ++
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1 file changed, 2 insertions(+)
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--- a/drivers/i2c/busses/i2c-qup.c
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+++ b/drivers/i2c/busses/i2c-qup.c
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@@ -835,6 +835,8 @@ static int qup_i2c_bam_do_xfer(struct qu
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}
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if (ret || qup->bus_err || qup->qup_err) {
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+ reinit_completion(&qup->xfer);
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+
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if (qup_i2c_change_state(qup, QUP_RUN_STATE)) {
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dev_err(qup->dev, "change to run state timed out");
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goto desc_err;
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