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| author | Paul Zimmerman | 2014-09-16 22:47:26 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman | 2014-09-20 01:17:58 +0200 |
| commit | e8f8c14d9da7ab1b8a7b0f769cd7148ca2cc7d10 (patch) | |
| tree | 1f689fc9680a8059f83fd2be66c9541a700c4da5 /drivers/usb/dwc2 | |
| parent | usb: dwc2/gadget: disable clock when it's not needed (diff) | |
| download | kernel-qcow2-linux-e8f8c14d9da7ab1b8a7b0f769cd7148ca2cc7d10.tar.gz kernel-qcow2-linux-e8f8c14d9da7ab1b8a7b0f769cd7148ca2cc7d10.tar.xz kernel-qcow2-linux-e8f8c14d9da7ab1b8a7b0f769cd7148ca2cc7d10.zip | |
usb: dwc2: clip max_transfer_size to 65535
Clip max_transfer_size to 65535 for host. dwc2_hc_setup_align_buf()
allocates coherent buffers with this size, and if it's too large we
can exhaust the coherent DMA pool.
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')
| -rw-r--r-- | drivers/usb/dwc2/core.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/usb/dwc2/core.c b/drivers/usb/dwc2/core.c index ea0048a724cf..d9269459d481 100644 --- a/drivers/usb/dwc2/core.c +++ b/drivers/usb/dwc2/core.c @@ -2743,6 +2743,13 @@ int dwc2_get_hwparams(struct dwc2_hsotg *hsotg) width = (hwcfg3 & GHWCFG3_XFER_SIZE_CNTR_WIDTH_MASK) >> GHWCFG3_XFER_SIZE_CNTR_WIDTH_SHIFT; hw->max_transfer_size = (1 << (width + 11)) - 1; + /* + * Clip max_transfer_size to 65535. dwc2_hc_setup_align_buf() allocates + * coherent buffers with this size, and if it's too large we can + * exhaust the coherent DMA pool. + */ + if (hw->max_transfer_size > 65535) + hw->max_transfer_size = 65535; width = (hwcfg3 & GHWCFG3_PACKET_SIZE_CNTR_WIDTH_MASK) >> GHWCFG3_PACKET_SIZE_CNTR_WIDTH_SHIFT; hw->max_packet_count = (1 << (width + 4)) - 1; |