diff options
| author | Paul Zimmerman <Paul.Zimmerman@synopsys.com> | 2014-09-16 22:47:27 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-09-20 01:17:58 +0200 |
| commit | 5dce95554a1866339de039060ecd7122056a9d71 (patch) | |
| tree | e25163adc05c801147a573462dde9ee51ebaa0fb /drivers/usb/dwc2/hcd_queue.c | |
| parent | usb: dwc2: clip max_transfer_size to 65535 (diff) | |
| download | linux-5dce95554a1866339de039060ecd7122056a9d71.tar.xz linux-5dce95554a1866339de039060ecd7122056a9d71.zip | |
usb: dwc2: handle DMA buffer unmapping sanely
The driver's handling of DMA buffers for non-aligned transfers
was kind of nuts. For IN transfers, it left the URB DMA buffer
mapped until the transfer completed, then synced it, copied the
data from the bounce buffer, then synced it again.
Instead of that, just call usb_hcd_unmap_urb_for_dma() to unmap
the buffer before starting the transfer. Then no syncing is
required when doing the copy. This should also allow handling of
other types of mappings besides just dma_map_single() ones.
Also reduce the size of the bounce buffer allocation for Isoc
endpoints to 3K, since that's the largest possible transfer size.
Tested on Raspberry Pi and Altera SOCFPGA.
Signed-off-by: Paul Zimmerman <paulz@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/dwc2/hcd_queue.c')
| -rw-r--r-- | drivers/usb/dwc2/hcd_queue.c | 16 |
1 files changed, 4 insertions, 12 deletions
diff --git a/drivers/usb/dwc2/hcd_queue.c b/drivers/usb/dwc2/hcd_queue.c index 9540f7e1e20e..bb97838bc6c0 100644 --- a/drivers/usb/dwc2/hcd_queue.c +++ b/drivers/usb/dwc2/hcd_queue.c @@ -229,19 +229,11 @@ static struct dwc2_qh *dwc2_hcd_qh_create(struct dwc2_hsotg *hsotg, */ void dwc2_hcd_qh_free(struct dwc2_hsotg *hsotg, struct dwc2_qh *qh) { - u32 buf_size; - - if (hsotg->core_params->dma_desc_enable > 0) { + if (hsotg->core_params->dma_desc_enable > 0) dwc2_hcd_qh_free_ddma(hsotg, qh); - } else if (qh->dw_align_buf) { - if (qh->ep_type == USB_ENDPOINT_XFER_ISOC) - buf_size = 4096; - else - buf_size = hsotg->core_params->max_transfer_size; - dma_free_coherent(hsotg->dev, buf_size, qh->dw_align_buf, - qh->dw_align_buf_dma); - } - + else if (qh->dw_align_buf) + dma_free_coherent(hsotg->dev, qh->dw_align_buf_size, + qh->dw_align_buf, qh->dw_align_buf_dma); kfree(qh); } |