Hi wolfram,
> On Mon, Feb 22, 2016 at 05:38:15PM +0530, Sricharan R wrote:
> > QUP cores can be attached to a BAM module, which acts as a dma engine
> > for the QUP core. When DMA with BAM is enabled, the BAM consumer
> pipe
> > transmitted data is written to the output FIFO and the BAM producer
> > pipe received data is read from the input FIFO.
> >
> > With BAM capabilities, qup-i2c core can transfer more than
> > 256 bytes, without a 'stop' which is not possible otherwise.
> >
> > Signed-off-by: Sricharan R <[email protected]>
> > Reviewed-by: Andy Gross <[email protected]>
> > Tested-by: Archit Taneja <[email protected]>
> > Tested-by: Telkar Nagender <[email protected]>
>
> Applied to for-next, thanks!
There is a bug with only this patch which comes out when CONFIG_DEBUG_SG
option gets
enabled. I have patch like below to fix it, but wanted to ask you if it
would correct to have this in the
original patch or should I sent a separate fix ? Sorry for the mess on this.
Not sure if the pull request is sent
already.
diff --git a/drivers/i2c/busses/i2c-qup.c b/drivers/i2c/busses/i2c-qup.c
index 23eaabb..a1fae0c 100644
--- a/drivers/i2c/busses/i2c-qup.c
+++ b/drivers/i2c/busses/i2c-qup.c
@@ -595,9 +595,6 @@ static int qup_sg_set_buf(struct scatterlist *sg, void
*buf,
if (!ret)
return -EINVAL;
- if (!map)
- sg_dma_address(sg) = tg->addr + ((u8 *)buf - tg->start);
-
return 0;
}
@@ -1268,6 +1265,8 @@ static int qup_i2c_xfer_v2(struct i2c_adapter *adap,
}
}
+ idx = 0;
+
do {
if (msgs[idx].len == 0) {
ret = -EINVAL;
@@ -1407,27 +1406,21 @@ static int qup_i2c_probe(struct platform_device
*pdev)
/* 2 tag bytes for each block + 5 for start, stop tags */
size = blocks * 2 + 5;
- qup->dpool = dma_pool_create("qup_i2c-dma-pool", &pdev->dev,
- size, 4, 0);
- qup->start_tag.start = dma_pool_alloc(qup->dpool,
GFP_KERNEL,
- &qup->start_tag.addr);
+ qup->start_tag.start = devm_kzalloc(&pdev->dev,
+ size, GFP_KERNEL);
if (!qup->start_tag.start) {
ret = -ENOMEM;
goto fail_dma;
}
- qup->brx.tag.start = dma_pool_alloc(qup->dpool,
- GFP_KERNEL,
- &qup->brx.tag.addr);
+ qup->brx.tag.start = devm_kzalloc(&pdev->dev, size,
GFP_KERNEL);
if (!qup->brx.tag.start) {
ret = -ENOMEM;
goto fail_dma;
}
- qup->btx.tag.start = dma_pool_alloc(qup->dpool,
- GFP_KERNEL,
- &qup->btx.tag.addr);
+ qup->btx.tag.start = devm_kzalloc(&pdev->dev, size,
GFP_KERNEL);
if (!qup->btx.tag.start) {
ret = -ENOMEM;
goto fail_dma;
@@ -1566,13 +1559,6 @@ static int qup_i2c_remove(struct platform_device
*pdev)
struct qup_i2c_dev *qup = platform_get_drvdata(pdev);
if (qup->is_dma) {
- dma_pool_free(qup->dpool, qup->start_tag.start,
- qup->start_tag.addr);
- dma_pool_free(qup->dpool, qup->brx.tag.start,
- qup->brx.tag.addr);
- dma_pool_free(qup->dpool, qup->btx.tag.start,
- qup->btx.tag.addr);
- dma_pool_destroy(qup->dpool);
dma_release_channel(qup->btx.dma);
dma_release_channel(qup->brx.dma);
}
--
Regards,
Sricharan
