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SubjectRe: [PATCH 01/12] i2c: qup: fixed releasing dma without flush operation completion
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Tested on Centriq 2400

Reviewed-by: Austin Christ <austinwc@codeaurora.org>

On 2/3/2018 12:58 AM, Abhishek Sahu wrote:
> 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>
> ---
> drivers/i2c/busses/i2c-qup.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/i2c/busses/i2c-qup.c b/drivers/i2c/busses/i2c-qup.c
> index 08f8e01..9faa26c41a 100644
> --- a/drivers/i2c/busses/i2c-qup.c
> +++ b/drivers/i2c/busses/i2c-qup.c
> @@ -1,5 +1,5 @@
> /*
> - * Copyright (c) 2009-2013, The Linux Foundation. All rights reserved.
> + * Copyright (c) 2009-2013, 2016-2018, The Linux Foundation. All rights reserved.
> * Copyright (c) 2014, Sony Mobile Communications AB.
> *
> *
> @@ -844,6 +844,8 @@ static int qup_i2c_bam_do_xfer(struct qup_i2c_dev *qup, struct i2c_msg *msg,
> }
>
> 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;
>

--
Qualcomm Datacenter Technologies as an affiliate of Qualcomm
Technologies, Inc.
Qualcomm Technologies, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.

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