diff options
| author | Pavel Hofman <pavel.hofman@ivitera.com> | 2020-11-20 17:39:20 +0100 |
|---|---|---|
| committer | Nicolas Saenz Julienne <nsaenzjulienne@suse.de> | 2020-11-20 17:43:10 +0100 |
| commit | 278407a53c3b33fb820332c4d39eb39316c3879a (patch) | |
| tree | 43359f1b343d46ebd91ce5a46c5cd3f2d4fe98e6 | |
| parent | 358afb8b746d4a7ebaeeeaab7a1523895a8572c2 (diff) | |
ARM: dts: bcm283x: increase dwc2's RX FIFO size
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/
| -rw-r--r-- | arch/arm/boot/dts/bcm283x-rpi-usb-otg.dtsi | 2 | ||||
| -rw-r--r-- | arch/arm/boot/dts/bcm283x-rpi-usb-peripheral.dtsi | 2 |
2 files changed, 2 insertions, 2 deletions
diff --git a/arch/arm/boot/dts/bcm283x-rpi-usb-otg.dtsi b/arch/arm/boot/dts/bcm283x-rpi-usb-otg.dtsi index e2fd9610e125..20322de2f8bf 100644 --- a/arch/arm/boot/dts/bcm283x-rpi-usb-otg.dtsi +++ b/arch/arm/boot/dts/bcm283x-rpi-usb-otg.dtsi @@ -1,7 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 &usb { dr_mode = "otg"; - g-rx-fifo-size = <256>; + g-rx-fifo-size = <558>; g-np-tx-fifo-size = <32>; /* * According to dwc2 the sum of all device EP diff --git a/arch/arm/boot/dts/bcm283x-rpi-usb-peripheral.dtsi b/arch/arm/boot/dts/bcm283x-rpi-usb-peripheral.dtsi index 0ff0e9e25327..1409d1b559c1 100644 --- a/arch/arm/boot/dts/bcm283x-rpi-usb-peripheral.dtsi +++ b/arch/arm/boot/dts/bcm283x-rpi-usb-peripheral.dtsi @@ -1,7 +1,7 @@ // SPDX-License-Identifier: GPL-2.0 &usb { dr_mode = "peripheral"; - g-rx-fifo-size = <256>; + g-rx-fifo-size = <558>; g-np-tx-fifo-size = <32>; g-tx-fifo-size = <256 256 512 512 512 768 768>; }; |