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From 1257716d9bae9730c43c636046983f5d80c4efc8 Mon Sep 17 00:00:00 2001
From: Phil Elwell <phil@raspberrypi.com>
Date: Tue, 4 Feb 2020 13:03:21 +0000
Subject: [PATCH] overlays: dwc2: Increase RX FIFO size
The previous version of the dwc2 overlay set the RX FIFO size to
256 4-byte words. This sounds large enough for a 1024 byte packet (the
largest isochronous high speed packet allowed), but it doesn't take
into account some extra space needed by the hardware.
Minas Harutyunyan at Synopsys (the source of the DWC OTG design)
came up with a more correct value, 301, but since there is spare packet
RAM this can be increased to 558 to allow two packets per frame.
Also update the upstream overlay to match.
See: https://github.com/raspberrypi/linux/issues/3447
Signed-off-by: Phil Elwell <phil@raspberrypi.com>
---
arch/arm/boot/dts/overlays/dwc2-overlay.dts | 2 +-
arch/arm/boot/dts/overlays/upstream-overlay.dts | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
--- a/arch/arm/boot/dts/overlays/dwc2-overlay.dts
+++ b/arch/arm/boot/dts/overlays/dwc2-overlay.dts
@@ -12,7 +12,7 @@
compatible = "brcm,bcm2835-usb";
dr_mode = "otg";
g-np-tx-fifo-size = <32>;
- g-rx-fifo-size = <256>;
+ g-rx-fifo-size = <558>;
g-tx-fifo-size = <512 512 512 512 512 256 256>;
status = "okay";
};
--- a/arch/arm/boot/dts/overlays/upstream-overlay.dts
+++ b/arch/arm/boot/dts/overlays/upstream-overlay.dts
@@ -123,7 +123,7 @@
compatible = "brcm,bcm2835-usb";
dr_mode = "otg";
g-np-tx-fifo-size = <32>;
- g-rx-fifo-size = <256>;
+ g-rx-fifo-size = <558>;
g-tx-fifo-size = <512 512 512 512 512 256 256>;
status = "okay";
};
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