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rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234127AbhEZRN7 (ORCPT ); Wed, 26 May 2021 13:13:59 -0400 Received: from [192.168.1.107] ([37.4.249.151]) by mrelayeu.kundenserver.de (mreue009 [212.227.15.167]) with ESMTPSA (Nemesis) id 1M7sQ6-1lpoxk2o1S-004yAD; Wed, 26 May 2021 19:12:10 +0200 Subject: Re: [PATCH] ARM: dts: bcm283x: increase dwc2's RX FIFO size To: Pavel Hofman , Minas Harutyunyan , Rob Herring , Nicolas Saenz Julienne , linux-usb@vger.kernel.org, devicetree@vger.kernel.org, linux-rpi-kernel@lists.infradead.org References: From: Stefan Wahren Autocrypt: addr=stefan.wahren@i2se.com; keydata= LS0tLS1CRUdJTiBQR1AgUFVCTElDIEtFWSBCTE9DSy0tLS0tClZlcnNpb246IEdudVBHIHYy CgptUUlOQkZ0NmdCTUJFQUN1Yi9wQmV2SHhidkplZnlaRzMySklObW4yYnNFUFgyNVY2ZmVq bXlZd21DR0tqRnRMCi9Eb1VNRVZIRHhDSjQ3Qk1YbzM0NGZIVjFDM0FudWRnTjFCZWhMb0J0 TEh4bW5lQ3pnSDNLY1B0V1c3cHRqNEcKdEp2OUNRRFp5MjdTS29FUHh5YUk4Q0YweWdSeEpj NzJNOUk5d21zUFo1YlVIc0x1WVdNcVE3SmNSbVBzNkQ4ZwpCa2srOC95bmdFeU5FeHd4SnBS 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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 > Signed-off-by: Pavel Hofman > --- > arch/arm/boot/dts/bcm283x-rpi-usb-otg.dtsi | 2 +- > 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 e2fd961..20322de 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 0ff0e9e..1409d1b 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>; sorry for being late at the party, but this change introduce a regression on Raspberry Pi 4 B: dwc2 fe980000.usb: dwc2_check_param_tx_fifo_sizes: Invalid parameter g-tx-fifo-size, setting to default average I known you didn't change the tx fifo size, but there are complex constrains regarding the total fifo size. Are you able to test this with a mainline kernel (not Raspberry Pi kernel) and send a fix for this? > g-np-tx-fifo-size = <32>; > g-tx-fifo-size = <256 256 512 512 512 768 768>; > };