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| author | Paul Zimmerman <Paul.Zimmerman@synopsys.com> | 2014-09-17 00:47:26 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-09-20 03:17:58 +0400 |
| commit | e8f8c14d9da7ab1b8a7b0f769cd7148ca2cc7d10 (patch) | |
| tree | 1f689fc9680a8059f83fd2be66c9541a700c4da5 | |
| parent | d00b41428042e72d9dc2557d9147434a4e3d631f (diff) | |
| download | linux-e8f8c14d9da7ab1b8a7b0f769cd7148ca2cc7d10.tar.xz | |
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>
| -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; |