This reverts commit 278407a53c.
The original change breaks USB config on Raspberry Pi Zero and Pi 4 B,
because it exceeds the total fifo size of 4080. A naive attempt to reduce
g-tx-fifo-size doesn't help on Raspberry Pi Zero. So better go back.
Fixes: 278407a53c ("ARM: dts: bcm283x: increase dwc2's RX FIFO size")
Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Cc: Pavel Hofman <pavel.hofman@ivitera.com>
Link: https://lore.kernel.org/r/1622293371-5997-1-git-send-email-stefan.wahren@i2se.com
Signed-off-by: Nicolas Saenz Julienne <nsaenz@kernel.org>
The previous version of the dwc2 overlay set the RX FIFO size to
256 4-byte words. This is not enough for 1024 bytes of the largest
isochronous high speed packet allowed, because it doesn't take into
account extra space needed by dwc2.
RX FIFO's size is calculated based on the following (in 4byte words):
- 13 locations for SETUP packets
5*n + 8 for Slave and Buffer DMA mode where n is number of control
endpoints which is 1 on the bcm283x core
- 1 location for Global OUT NAK
- 2 * 257 locations for status information and the received packet.
Typically two spaces are recommended so that when the previous packet
is being transferred to AHB, the USB can receive the subsequent
packet.
- 10 * 1 location for transfer complete status for last packet of each
endpoint. The bcm283x core has 5 IN and 5 OUT EPs
- 10 * 1 additional location for EPDisable status for each endpoint
- 5 * 2 additional locations are recommended for each OUT endpoint
Total is 558 locations.
Signed-off-by: Phil Elwell <phil@raspberrypi.com>
Signed-off-by: Pavel Hofman <pavel.hofman@ivitera.com>
Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Link: https://lore.kernel.org/r/e9e7d070-593c-122f-3a5c-2435bb147ab2@ivitera.com/
This adds minimal support for the new Raspberry Pi 4 without the
fancy stuff like GENET, PCIe, xHCI, 40 bit DMA and V3D. The RPi 4 is
available in 3 different variants (1, 2 and 4 GB RAM), so leave the memory
size to zero and let the bootloader take care of it. The DWC2 is still
usable as peripheral via the USB-C port.
Other differences to the Raspberry Pi 3:
- additional GIC 400 Interrupt controller
- new thermal IP and HWRNG
- additional MMC interface (emmc2)
- additional UART, I2C, SPI and PWM interfaces
- clock stretching bug in I2C IP has been fixed
Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
Acked-by: Eric Anholt <eric@anholt.net>
Acked-by: Florian Fanelli <f.fainelli@gmail.com>
