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[94.29.61.202]) by smtp.googlemail.com with ESMTPSA id m15sm636229ljp.6.2021.10.21.12.17.17 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 21 Oct 2021 12:17:17 -0700 (PDT) Subject: Re: [PATCH v1] usb: xhci: tegra: Check padctrl interrupt presence in device tree To: Alan Stern Cc: Thierry Reding , Thierry Reding , Jonathan Hunter , Greg Kroah-Hartman , Mathias Nyman , JC Kuo , Nicolas Chauvet , linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, linux-tegra@vger.kernel.org References: <20211021115501.14932-1-digetx@gmail.com> <5f122caa-c810-534d-b2a1-53edef313ff0@gmail.com> <32694811-8768-8e77-f188-4ed1a1fb93da@gmail.com> <20211021152028.GB1161262@rowland.harvard.edu> <82a02e70-33bc-7faf-e085-a25884e48844@gmail.com> <44567c4f-0f0f-6995-b48f-c427cedb6755@gmail.com> <20211021191452.GA1170019@rowland.harvard.edu> From: Dmitry Osipenko Message-ID: <19e852e5-0952-f665-4e0c-627e070f6abf@gmail.com> Date: Thu, 21 Oct 2021 22:17:16 +0300 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: <20211021191452.GA1170019@rowland.harvard.edu> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 21.10.2021 22:14, Alan Stern пишет: ... >>> Should USB keyboard be able to wake up every HC or it's a >>> machine-specific feature? >> >> I mean whether key press should wake up HC if wake-up is enabled for the >> keyboard device. > > Yes, it should. More specifically, if the keyboard is capable of > generating wakeup requests, and wakeup is enabled for both the keyboard > device and the HC, then the keyboard should be able to wake up the > system from suspend. Some HCs or systems might not support this > capability, however. > >>> I'm asking because wakeup works on a typical >>> Intel hardware, but doesn't work on older Tegra SoCs that use Chipidea >>> controller. It's not obvious to me whether this is something that >>> firmware handles for Intel or it's broken on Tegra. Could you please >>> clarify? If it should work for every HC, then I may try to take a closer >>> look. > > If the hardware/firmware can support it then it should work. I don't > know what's going on with your older Tegra SoCs; it's possible there is > a bug in the driver. I'll take a closer look then, thank you.