usb: cdns3: fix iso transfer error when mult is not zero

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commit 92f02efa1d upstream.

ISO basic transfer is
	ITP(SOF) Package_0 Package_1 ... Package_n

CDNS3 DMA start dma transfer from memmory to internal FIFO when get SOF,
controller will transfer data to usb bus from internal FIFO when get IN
token.

According USB spec defination:
	Maximum number of packets = (bMaxBurst + 1) * (Mult + 1)

Internal memory should be the same as (bMaxBurst + 1) * (Mult + 1). DMA
don't fetch data advance when ISO transfer, so only reserve
(bMaxBurst + 1) * (Mult + 1) internal memory for ISO transfer.

Need save Mult and bMaxBurst information and set it into EP_CFG register,
otherwise only 1 package is sent by controller, other package will be
lost.

Cc:  <stable@vger.kernel.org>
Fixes: 7733f6c32e ("usb: cdns3: Add Cadence USB3 DRD Driver")
Signed-off-by: Frank Li <Frank.Li@nxp.com>
Link: https://lore.kernel.org/r/20231224153816.1664687-3-Frank.Li@nxp.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Frank Li 2023-12-24 10:38:14 -05:00 • committed by Greg Kroah-Hartman

parent 3f2bf7cac0

commit 45c766231e

2 changed files with 39 additions and 23 deletions

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59

drivers/usb/cdns3/cdns3-gadget.c

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3

drivers/usb/cdns3/cdns3-gadget.h

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