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([212.227.126.133]:60921 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236531AbhE0Nt2 (ORCPT ); Thu, 27 May 2021 09:49:28 -0400 Received: from [192.168.1.107] ([37.4.249.151]) by mrelayeu.kundenserver.de (mreue009 [212.227.15.167]) with ESMTPSA (Nemesis) id 1M5Q6n-1lktRr0Yth-001VOu; Thu, 27 May 2021 15:47:42 +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: <44d8f7e0-b2d0-8547-7367-7a35af68efe6@i2se.com> <7c2e3e1f-db10-b376-9b87-ef93c8d8289c@ivitera.com> From: Stefan Wahren Autocrypt: addr=stefan.wahren@i2se.com; keydata= LS0tLS1CRUdJTiBQR1AgUFVCTElDIEtFWSBCTE9DSy0tLS0tClZlcnNpb246IEdudVBHIHYy CgptUUlOQkZ0NmdCTUJFQUN1Yi9wQmV2SHhidkplZnlaRzMySklObW4yYnNFUFgyNVY2ZmVq bXlZd21DR0tqRnRMCi9Eb1VNRVZIRHhDSjQ3Qk1YbzM0NGZIVjFDM0FudWRnTjFCZWhMb0J0 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V03:K1:X9LgzP4o/F21AkBxFCV0ivszAjDqReNPHzLS4gfw7caQQmDZ2on yrnQwcUmxcZI24Q58kyfAWygNcRVQwYTfZY1+tmJVnriiH9NjqI30CVKqoSFoY2TLsa+Xhn Y0mqMaRUo7yXaZVz1t2HOYMLyFj+ntmY3/0shOZ8v21QHJWFlRCIUQgQ/w44Z7w8plGqXpj bwdl9kFkEi1Mvj4doZehA== X-UI-Out-Filterresults: notjunk:1;V03:K0:BfgFQlkux2o=:DfytU/BljN61/KWSIxqyNE q5xpmsYlEOoL8Fojq4kbQDjVMEkbnme5zA9gyrVjSLNHymoMKaQQ1uE5+59avHzHCjq5sjd4E 7O9GLifI98u0HmtKf+L5LXw8YnhpDcJUQztFSiSCENyFsFb5yCgfSbEChytYm0VkbmN0BMcpx vczn6I/CyZdjGqKi17gwdzZO7aSsmC7IeB3Pe+oG4Km+v0wAeC0Jld2vzXQZVULa/Jy2Y14GO Sy38kSJm15kqEYonlbx62FS2CBU5qnkUKDhnCXcVO+qNttQfvpX0Uamox4pgDapOQzKZZ1luB Ep/Xtof3tFx35HGRt5iD+PsM0ma1IlJxHVIuaU0cZDJiENTLsAbu4GqGDw2IZqJeqgCjBEM7H 3EFNFAgKrioNxHt7wyrLZKZ1M9Ezzi+2AzN5FSsq/4VZj9+8Bk9qlNiJ9RzyPQ83OIbv5tDka UiOaIpAVg7EkUxG2Dcm/ibsBfCJOsRHWAQ/D2f2P9T5G7RucX6LP1mj/8e0k6+THxmoLNVoiB ca7M1NLLRf1bO2jRJNNhfw= Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org Hi Pavel, fix Nicolas address. Sorry about this. Am 27.05.21 um 15:17 schrieb Pavel Hofman: > Hi Stefan, > > Dne 26. 05. 21 v 19:12 Stefan Wahren napsal(a): >> Am 13.11.20 um 08:18 schrieb Pavel Hofman: >>> 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 >>> 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>; >>> }; > I think I see the problem. > > IIUC the calculations and checks, all g-tx-fifo-size values + > g-rx-fifo-size + g-np-tx-fifo-size must not exceed total_fifo_size. My > RPi4 reports the total_fifo_size as 4080 (in > /sys/kernel/debug/usb/fe980000.usb/hw_params). > > Linux mainline > https://github.com/torvalds/linux/search?p=3&q=g-tx-fifo-size : > > The increase in value of g-rx-fifo-size exceeds the limit for the DTSI > files we patched: > > Both bcm283x-rpi-usb-peripheral.dtsi and bcm283x-rpi-usb-otg.dtsi: > 558 + 32 + 256 + 256 + 512 + 512 + 512 + 768 + 768 = 4174 > 4080 > > while the sum with the previous value of 256 reached just 3872 < 4080. > > > The raspberrypi repo > https://github.com/raspberrypi/linux/search?q=g-tx-fifo-size : > > It has a different mix of the DTSI files > dwc2-overlay.dts > upstream-overlay.dts > upstream-pi4-overlay.dts yes these overlay files are vendor specific and doesn't exist in mainline. The upstream*dts were intended to "simulate" mainline behavior, but unfortunately differ in this case. > > all of which define > g-tx-fifo-size = <512 512 512 512 512 256 256>; > > Here the calculation holds: > 558 + 32 + 512 + 512 + 512 + 512 + 512 + 256 + 256 = 3662 < 4080 > > My RPi4 uses one of these DTSIs, because my > /sys/kernel/debug/usb/fe980000.usb/params says: > > g_rx_fifo_size : 558 > g_np_tx_fifo_size : 32 > g_tx_fifo_size[0] : 0 > g_tx_fifo_size[1] : 512 > g_tx_fifo_size[2] : 512 > g_tx_fifo_size[3] : 512 > g_tx_fifo_size[4] : 512 > g_tx_fifo_size[5] : 512 > g_tx_fifo_size[6] : 256 > g_tx_fifo_size[7] : 256 > > > IIUC the tx_fifo values in bcm283x-rpi-usb-peripheral.dtsi and > bcm283x-rpi-usb-otg.dtsi files can be lowered to the values used and > tested (at least by me) in the RPi repo. But this is outside of my > knowledge, honestly I do not know what is the most appropriate > distribution of the remaining fifo space among the g_tx_fifo buffers. > Please can the RPi developers (Phil?) suggest a fix? As author of the mainline bcm283x-rpi-usb-otg.dtsi i was trying to optimize the fifo sizes for EP 6 and 7. But i don't remember why. So my suggestion for a fix would be: g-tx-fifo-size = <256 256 256 512 512 768 768>; But i'm also unsure about the values. > > Thanks a lot to Stefan and to everyone involved. > > Pavel.