diff options
Diffstat (limited to 'target/linux/bcm27xx/patches-4.19/950-0814-overlays-dwc2-Increase-RX-FIFO-size.patch')
| -rw-r--r-- | target/linux/bcm27xx/patches-4.19/950-0814-overlays-dwc2-Increase-RX-FIFO-size.patch | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/target/linux/bcm27xx/patches-4.19/950-0814-overlays-dwc2-Increase-RX-FIFO-size.patch b/target/linux/bcm27xx/patches-4.19/950-0814-overlays-dwc2-Increase-RX-FIFO-size.patch new file mode 100644 index 0000000000..a8e7bd3c90 --- /dev/null +++ b/target/linux/bcm27xx/patches-4.19/950-0814-overlays-dwc2-Increase-RX-FIFO-size.patch @@ -0,0 +1,32 @@ +From 389107911744588cce5e06c23a058c9cfb641f33 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. + +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 +- + 1 file changed, 1 insertion(+), 1 deletion(-) + +--- 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"; + }; |