From patchwork Mon Mar 2 15:55:24 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Nicolas Saenz Julienne X-Patchwork-Id: 11415781 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 92FA214B7 for ; Mon, 2 Mar 2020 15:56:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 711A62467B for ; Mon, 2 Mar 2020 15:56:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727383AbgCBP4H (ORCPT ); Mon, 2 Mar 2020 10:56:07 -0500 Received: from mx2.suse.de ([195.135.220.15]:51266 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727306AbgCBP4G (ORCPT ); Mon, 2 Mar 2020 10:56:06 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx2.suse.de (Postfix) with ESMTP id 4AC3EACD6; Mon, 2 Mar 2020 15:56:04 +0000 (UTC) From: Nicolas Saenz Julienne To: linux-kernel@vger.kernel.org Cc: linux-usb@vger.kernel.org, linux-rpi-kernel@lists.infradead.org, linux-arm-kernel@lists.infradead.org, bcm-kernel-feedback-list@broadcom.com, f.fainelli@gmail.com, gregkh@linuxfoundation.org, tim.gover@raspberrypi.org, linux-pci@vger.kernel.org, wahrenst@gmx.net, Nicolas Saenz Julienne , Andrew Murray Subject: [PATCH v3 0/4] Raspberry Pi 4 VL805 firmware load support Date: Mon, 2 Mar 2020 16:55:24 +0100 Message-Id: <20200302155528.19505-1-nsaenzjulienne@suse.de> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Sender: linux-usb-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org On the Raspberry Pi 4, after a PCI reset, VL805's firmware may either be loaded directly from an EEPROM or, if not present, by the SoC's VideCore. This series adds support for the later. Note that there are a set of constraints we have to consider (some of them I missed on v1): - We need to make sure the VideoCore firmware interface is up and running before running the VL805 firmware load call. - There is no way to discern RPi4's VL805 chip from other platforms', so we need the firmware load to happen *before* running quirk_usb_handoff_xhci(). Failure to do so results in an unwarranted 5 second wait while the fixup code polls xHC's unexisting state. As per Stefan Wahren's comments I tested the behaviour on outdated firmware. Boards dependent on this will not boot if firmware is not up-to-date. Older boards with outdated firmware will fail to execute the VideoCore firmware call, but xHCI will perform reliably. I added a warning printout in case of failure. I'm aware that Florian Fianelli noted on the previous revision that waiting on the VideoCore firmware interface during PCIe's probe is far from ideal. But this was before taking into account the second constraint mentioned above. Impact on non RPi4 boards is minimal. --- Changes since v1: - Addressed Floarians comments Nicolas Saenz Julienne (4): soc: bcm2835: Sync xHCI reset firmware property with downstream firmware: raspberrypi: Introduce vl805 init routine PCI: brcmstb: Wait for Raspberry Pi's firmware when present USB: pci-quirks: Add Raspberry Pi 4 quirk drivers/firmware/Kconfig | 1 + drivers/firmware/raspberrypi.c | 38 ++++++++++++++++++++++ drivers/pci/controller/pcie-brcmstb.c | 15 +++++++++ drivers/usb/host/pci-quirks.c | 18 ++++++++++ include/soc/bcm2835/raspberrypi-firmware.h | 9 ++++- 5 files changed, 80 insertions(+), 1 deletion(-)