The default DMA mask covers a 32 bits address range, but devices can address more than that. Set the DMA mask to the actual addressable range to avoid the use of unneeded bounce buffers.
Signed-off-by: Alexandre Courbot acourbot@nvidia.com --- Changes since v1: - set the mask at the bus level so of_dma_configure() does the right thing
drivers/gpu/host1x/bus.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/host1x/bus.c b/drivers/gpu/host1x/bus.c index c27858ae0552..e04c7114f976 100644 --- a/drivers/gpu/host1x/bus.c +++ b/drivers/gpu/host1x/bus.c @@ -19,6 +19,7 @@ #include <linux/of.h> #include <linux/slab.h> #include <linux/of_device.h> +#include <linux/dma-mapping.h>
#include "bus.h" #include "dev.h" @@ -394,7 +395,7 @@ static int host1x_device_add(struct host1x *host1x, INIT_LIST_HEAD(&device->list); device->driver = driver;
- device->dev.coherent_dma_mask = host1x->dev->coherent_dma_mask; + device->dev.coherent_dma_mask = DMA_BIT_MASK(34); device->dev.dma_mask = &device->dev.coherent_dma_mask; dev_set_name(&device->dev, "%s", driver->driver.name); of_dma_configure(&device->dev, host1x->dev->of_node);