> From: dinguyen@xxxxxxxxxx [mailto:dinguyen@xxxxxxxxxx] > Sent: Monday, March 03, 2014 2:20 PM > > From: Dinh Nguyen <dinguyen@xxxxxxxxxx> > > The dwc2 IP on the SOCFPGA cannot use the default HW configured > FIFO sizes. The total FIFO depth as read from GHWCFG3 reports 0x1f80 or 8064 > 32-bit words. But the GRXFSIZ, GNPTXFSIZ, and HPTXFSIZ register defaults > to 0x2000 or 8192 32-bit words. So the driver cannot just use the fifo sizes > as read from those registers. > > For platforms that face the same issue, this commits sets the RX, periodic TX, > and non-periodic TX fifo size to those that are recommended v2.93a spec for > the DWC2 IP. > > Signed-off-by: Dinh Nguyen <dinguyen@xxxxxxxxxx> > Cc: Paul Zimmerman <paulz@xxxxxxxxxxxx> > Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> > --- > drivers/usb/dwc2/core.c | 41 +++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 41 insertions(+) > > diff --git a/drivers/usb/dwc2/core.c b/drivers/usb/dwc2/core.c > index 1d12988..e8e394c 100644 > --- a/drivers/usb/dwc2/core.c > +++ b/drivers/usb/dwc2/core.c > @@ -507,6 +507,44 @@ void dwc2_disable_host_interrupts(struct dwc2_hsotg *hsotg) > writel(intmsk, hsotg->regs + GINTMSK); > } > > +/* > + * dwc2_calculate_dynamic_fifo() - Calculates the default fifo size > + * For system that have a total fifo depth that is smaller than the default > + * RX + TX fifo size. > + * > + * @hsotg: Programming view of DWC_otg controller > + */ > +static void dwc2_calculate_dynamic_fifo(struct dwc2_hsotg *hsotg) > +{ > + struct dwc2_core_params *params = hsotg->core_params; > + struct dwc2_hw_params *hw = &hsotg->hw_params; > + u32 rxfsiz, nptxfsiz, ptxfsiz, total_fifo_size; > + > + total_fifo_size = hw->total_fifo_size; > + rxfsiz = params->host_rx_fifo_size; > + nptxfsiz = params->host_nperio_tx_fifo_size; > + ptxfsiz = params->host_perio_tx_fifo_size; > + > + if (total_fifo_size >= (rxfsiz + nptxfsiz + ptxfsiz)) > + /* Params are valid, nothing to do */ > + return; > + else { Kernel style says both branches of the if() statement should have parentheses here. (Checkpatch doesn't warn about that, I thought it did.) Other than that it looks OK. Once you fix the parentheses, you can add my acked-by. -- Paul -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
