]> git.baikalelectronics.ru Git - kernel.git/commit
usb: dwc2: Add function to calculate correct FIFO sizes
authorDinh Nguyen <dinguyen@altera.com>
Wed, 7 May 2014 13:31:29 +0000 (08:31 -0500)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Tue, 27 May 2014 22:42:42 +0000 (15:42 -0700)
commit222038c051865990bbc66a3764e320536b2c8dda
treee5d2d73ec5b5e1497ec56d8944f6e6f03caac9d5
parent2d2819be0c3c839fbe8110b35a560038f7b4bd7f
usb: dwc2: Add function to calculate correct FIFO sizes

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. Implements Method #2 from the Synopsys v2.93a spec for the DWC2.

Signed-off-by: Dinh Nguyen <dinguyen@altera.com>
Acked-by: Paul Zimmerman <paulz@synopsys.com>
Reviewed-by: Felipe Balbi <balbi@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/usb/dwc2/core.c