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tr> commit 92f02efa1d86d7dcaef7f38a5fe3396c4e88a93c 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: 7733f6c32e36 ("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> 2022-05-19usb: cdns3: allocate TX FIFO size according to composite EP numberFrank Li Some devices have USB compositions which may require multiple endpoints. To get better performance, need bigger CDNS3_EP_BUF_SIZE. But bigger CDNS3_EP_BUF_SIZE may exceed total hardware FIFO size when multiple endpoints. By introducing the check_config() callback, calculate CDNS3_EP_BUF_SIZE. Move CDNS3_EP_BUF_SIZE into cnds3_device: ep_buf_size Combine CDNS3_EP_ISO_SS_BURST and CDNS3_EP_ISO_HS_MULT into cnds3_device:ep_iso_burst Using a simple algorithm to calculate ep_buf_size. ep_buf_size = ep_iso_burst = (onchip_buffers - 2k) / (number of IN EP + 1). Test at 8qxp: Gadget ep_buf_size RNDIS: 5 RNDIS+ACM: 3 Mass Storage + NCM + ACM 2 Previous CDNS3_EP_BUF_SIZE is 4, RNDIS + ACM will be failure because exceed FIFO memory. Acked-by: Peter Chen <peter.chen@kernel.org> Signed-off-by: Frank Li <Frank.Li@nxp.com> Link: https://lore.kernel.org/r/20220509164055.1815081-1-Frank.Li@nxp.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>