[PATCH 4.9 143/172] spi: When no dma_chan map buffers with spi_masters parent

Greg Kroah-Hartman
2017-07-03T13:35:23Z

From: Daniel Kurtz <djkurtz@chromium.org>

commit 88b0aa544af58ce3be125a1845a227264ec9ab89 upstream.

Back before commit 1dccb598df54 ("arm64: simplify dma_get_ops"), for
arm64, devices for which dma_ops were not explicitly set were automatically
configured to use swiotlb_dma_ops, since this was hard-coded as the
global "dma_ops" in arm64_dma_init().

Now that global "dma_ops" has been removed, all devices much have their
dma_ops explicitly set by a call to arch_setup_dma_ops(), otherwise the
device is assigned dummy_dma_ops, and thus calls to map_sg for such a
device will fail (return 0).

Mediatek SPI uses DMA but does not use a dma channel. Support for this
was added by commit c37f45b5f1cd ("spi: support spi without dma channel
to use can_dma()"), which uses the master_spi dev to DMA map buffers.

The master_spi device is not a platform device, rather it is created
in spi_alloc_device(), and therefore its dma_ops are never set.

Therefore, when the mediatek SPI driver when it does DMA (for large SPI
transactions > 32 bytes), SPI will use spi_map_buf()->dma_map_sg() to
map the buffer for use in DMA. But dma_map_sg()->dma_map_sg_attrs() returns
0, because ops->map_sg is dummy_dma_ops->__dummy_map_sg, and hence
spi_map_buf() returns -ENOMEM (-12).

Fix this by using the real spi_master's parent device which should be a
real physical device with DMA properties.

Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>
Fixes: c37f45b5f1cd ("spi: support spi without dma channel to use can_dma()")
Cc: Leilk Liu <leilk.liu@mediatek.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
drivers/spi/spi.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -797,12 +797,12 @@ static int __spi_map_msg(struct spi_mast
if (master->dma_tx)
tx_dev = master->dma_tx->device->dev;
else
- tx_dev = &master->dev;
+ tx_dev = master->dev.parent;

if (master->dma_rx)
rx_dev = master->dma_rx->device->dev;
else
- rx_dev = &master->dev;
+ rx_dev = master->dev.parent;

list_for_each_entry(xfer, &msg->transfers, transfer_list) {
if (!master->can_dma(master, msg->spi, xfer))
@@ -844,12 +844,12 @@ static int __spi_unmap_msg(struct spi_ma
if (master->dma_tx)
tx_dev = master->dma_tx->device->dev;
else
- tx_dev = &master->dev;
+ tx_dev = master->dev.parent;

if (master->dma_rx)
rx_dev = master->dma_rx->device->dev;
else
- rx_dev = &master->dev;
+ rx_dev = master->dev.parent;

list_for_each_entry(xfer, &msg->transfers, transfer_list) {
if (!master->can_dma(master, msg->spi, xfer))