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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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arch
+1 -1
Submodule arch updated: 36be121ac4...12ef9caf3f
drivers/usbdev/Kconfig
+28 -8
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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"