usb: dwc2: host: Set host_rx_fifo_size to 525 for rk3066
As documented in dwc2_calculate_dynamic_fifo(), host_rx_fifo_size should
really be:
2 * ((Largest Packet size / 4) + 1 + 1) + n
with n = number of host channel.
We have 9 host channels, so
2 * ((1024/4) + 2) + 9 = 516 + 9 = 525
We've got 960 / 972 total_fifo_size on rk3288 (and presumably on
rk3066) and 525 + 128 + 256 = 909 so we're still under on both ports
even when we increment by 5.
In the future, it would be nice if dwc2_calculate_dynamic_fifo() could
handle the "too small" FIFO case and come up with something more
dynamically. When we do that we can figure out how to allocate the
extra 48 / 60 bytes of FIFO that we're currently wasting.
NOTE: no known bugs are fixed by this patch, but it seems like a simple
fix and ought to fix someone.
Acked-by: John Youn <johnyoun@synopsys.com>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>
Tested-by: Heiko Stuebner <heiko@sntech.de>
Signed-off-by: Felipe Balbi <balbi@kernel.org>
1 file changed