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| author | Roshan Pius <rpius@chromium.org> | 2015-02-02 14:55:38 -0800 |
|---|---|---|
| committer | Felipe Balbi <balbi@ti.com> | 2015-02-04 11:16:47 -0600 |
| commit | 251a17f5aff990ab117590df2a13ef032464c0d3 (patch) | |
| tree | cbff9700882e16cf3186cfbb67faf73d71a98c96 | |
| parent | 1fa2df0c70dadba1139c9dd52c9070d00fe23c98 (diff) | |
| download | linux-stable-251a17f5aff990ab117590df2a13ef032464c0d3.tar.gz linux-stable-251a17f5aff990ab117590df2a13ef032464c0d3.tar.bz2 linux-stable-251a17f5aff990ab117590df2a13ef032464c0d3.zip | |
usb: dwc2: Fix a bug in reading the endpoint directions from reg.
According to the DWC2 datasheet, the HWCFG1 register stores
the configured endpoint directions for endpoints 0-15 in bit positions
0-31.
==========================
Endpoint Direction (EpDir)
This 32-bit field uses two bits per endpoint to determine the endpoint
direction.
Endpoint
Bits [31:30]: Endpoint 15 direction
Bits [29:28]: Endpoint 14 direction
....
Bits [3:2]: Endpoint 1 direction
Bits[1:0]: Endpoint 0 direction (always BIDIR)
==========================
The DWC2 driver is currently interpreting the contents of the register
as directions for endpoints 1-15 which leads to an error in determining
the configured endpoint directions in the core because the first 2 bits
determine the direction of endpoint 0 and not 1.
This is based on testing/next branch in Felipe's git.
Signed-off-by: Roshan Pius <rpius@chromium.org>
Acked-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
| -rw-r--r-- | drivers/usb/dwc2/gadget.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/usb/dwc2/gadget.c b/drivers/usb/dwc2/gadget.c index 15aa5785090b..6a30887082cd 100644 --- a/drivers/usb/dwc2/gadget.c +++ b/drivers/usb/dwc2/gadget.c @@ -3308,7 +3308,7 @@ static int s3c_hsotg_hw_cfg(struct dwc2_hsotg *hsotg) hsotg->eps_out[0] = hsotg->eps_in[0]; cfg = readl(hsotg->regs + GHWCFG1); - for (i = 1; i < hsotg->num_of_eps; i++, cfg >>= 2) { + for (i = 1, cfg >>= 2; i < hsotg->num_of_eps; i++, cfg >>= 2) { ep_type = cfg & 3; /* Direction in or both */ if (!(ep_type & 2)) { |