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USB serial driver Kconfig: Select default sizes for serial buffers so that the can hold even multiples of the max packet size.

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This commit is contained in:
Gregory Nutt 2015-12-03 14:17:41 -06:00
parent 98c401a1f4
commit 2726f0ac7c
2 changed files with 29 additions and 9 deletions
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2
arch

@ -1 +1 @@
Subproject commit 36be121ac4338b771633610d95cb75e5ddc3f3fd
Subproject commit 12ef9caf3f708d62be342a097191fa1741e0464c

36
drivers/usbdev/Kconfig
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@ -246,15 +246,25 @@ config PL2303_BULKIN_REQLEN
config PL2303_RXBUFSIZE
int "Receive buffer size"
default 256
default 513 if USBDEV_DUALSPEED
default 257 if !USBDEV_DUALSPEED
---help---
Size of the serial receive/transmit buffers
Size of the serial receive buffers. The actual amount of data that
can be held in the buffer is this number minus one due to the way
that the circular buffer is managed. So an RX buffer size of 257
will hold four full-speed, 64 byte packets; a buffer size of 513
will hold one high-speed, 512 byte packet.
config PL2303_TXBUFSIZE
int "Transmit buffer size"
default 256
default 513 if USBDEV_DUALSPEED
default 257 if !USBDEV_DUALSPEED
---help---
Size of the serial receive/transmit buffers
Size of the serial transmit buffers. The actual amount of data that
can be held in the buffer is this number minus one due to the way
that the circular buffer is managed. So a TX buffer size of 257
will hold four full-speed, 64 byte packets; a buffer size of 513
will hold one high-speed, 512 byte packet.
config PL2303_VENDORID
hex "Vendor ID"
@ -421,15 +431,25 @@ config CDCACM_BULKIN_REQLEN
config CDCACM_RXBUFSIZE
int "Receive buffer size"
default 256
default 513 if USBDEV_DUALSPEED
default 257 if !USBDEV_DUALSPEED
---help---
Size of the serial receive/transmit buffers
Size of the serial receive buffers. The actual amount of data that
can be held in the buffer is this number minus one due to the way
that the circular buffer is managed. So an RX buffer size of 257
will hold four full-speed, 64 byte packets; a buffer size of 513
will hold one high-speed, 512 byte packet.
config CDCACM_TXBUFSIZE
int "Transmit buffer size"
default 256
default 513 if USBDEV_DUALSPEED
default 257 if !USBDEV_DUALSPEED
---help---
Size of the serial receive/transmit buffers
Size of the serial transmit buffers. The actual amount of data that
can be held in the buffer is this number minus one due to the way
that the circular buffer is managed. So a TX buffer size of 257
will hold four full-speed, 64 byte packets; a buffer size of 513
will hold one high-speed, 512 byte packet.
config CDCACM_VENDORID
hex "Vendor ID"