From 7239872fb3400b21a8f5547257f9f86455867bd6 Mon Sep 17 00:00:00 2001 From: Abhishek Sahu 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 Acked-by: Sricharan R Reviewed-by: Austin Christ Reviewed-by: Andy Gross Signed-off-by: Wolfram Sang --- 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;