staging: dwc2: remove use of bus_to_virt()
Remove the use of bus_to_virt() and just fail the transfer if an
unaligned buffer with no virtual address is found. AFAIK that
can't happen anyway.
Also change setting of coherent DMA mask to the normal 32 bits.
31 bits was only needed when calling bus_to_virt() AFAICR.
Signed-off-by: Paul Zimmerman <paulz@synopsys.com>
Tested-by: Stephen Warren <swarren@wwwdotorg.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/staging/dwc2/Kconfig b/drivers/staging/dwc2/Kconfig
index d15d9d5..be947d6 100644
--- a/drivers/staging/dwc2/Kconfig
+++ b/drivers/staging/dwc2/Kconfig
@@ -1,7 +1,6 @@
config USB_DWC2
tristate "DesignWare USB2 DRD Core Support"
depends on USB
- depends on VIRT_TO_BUS
help
Say Y or M here if your system has a Dual Role HighSpeed
USB controller based on the DesignWare HSOTG IP Core.
diff --git a/drivers/staging/dwc2/hcd.c b/drivers/staging/dwc2/hcd.c
index 2639209..962468f 100644
--- a/drivers/staging/dwc2/hcd.c
+++ b/drivers/staging/dwc2/hcd.c
@@ -2396,14 +2396,15 @@
!(usb_pipein(urb->pipe))));
buf = urb->transfer_buffer;
+
if (hcd->self.uses_dma) {
- /*
- * Calculate virtual address from physical address, because
- * some class driver may not fill transfer_buffer.
- * In Buffer DMA mode virtual address is used, when handling
- * non-DWORD aligned buffers.
- */
- buf = bus_to_virt(urb->transfer_dma);
+ if (!buf && (urb->transfer_dma & 3)) {
+ dev_err(hsotg->dev,
+ "%s: unaligned transfer with no transfer_buffer",
+ __func__);
+ retval = -EINVAL;
+ goto fail1;
+ }
}
if (!(urb->transfer_flags & URB_NO_INTERRUPT))
@@ -2833,9 +2834,8 @@
if (hsotg->core_params->dma_enable > 0) {
if (dma_set_mask(hsotg->dev, DMA_BIT_MASK(32)) < 0)
dev_warn(hsotg->dev, "can't set DMA mask\n");
- if (dma_set_coherent_mask(hsotg->dev, DMA_BIT_MASK(31)) < 0)
- dev_warn(hsotg->dev,
- "can't enable workaround for >2GB RAM\n");
+ if (dma_set_coherent_mask(hsotg->dev, DMA_BIT_MASK(32)) < 0)
+ dev_warn(hsotg->dev, "can't set coherent DMA mask\n");
} else {
dma_set_mask(hsotg->dev, 0);
dma_set_coherent_mask(hsotg->dev, 0);