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([2a01:e0a:3d9:2080:881c:7d0e:ad0a:d9a]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-45b7df3ff72sm101954645e9.1.2025.09.01.09.23.42 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 01 Sep 2025 09:23:42 -0700 (PDT) Message-ID: <2e5fc8dd-4dc2-4fea-9321-80daa5177163@linaro.org> Date: Mon, 1 Sep 2025 18:23:41 +0200 Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Reply-To: Neil Armstrong Subject: Re: [PATCH 2/3] platform: arm64: thinkpad-t14s-ec: new driver To: Sebastian Reichel , Mark Pearson Cc: Rob Herring , Krzysztof Kozlowski , Conor Dooley , Hans de Goede , =?UTF-8?Q?Ilpo_J=C3=A4rvinen?= , Bryan O'Donoghue , Bjorn Andersson , Konrad Dybcio , "Derek J . Clark" , Henrique de Moraes Holschuh , devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, "platform-driver-x86@vger.kernel.org" , linux-arm-msm@vger.kernel.org References: <20250831-thinkpad-t14s-ec-v1-0-6e06a07afe0f@collabora.com> <20250831-thinkpad-t14s-ec-v1-2-6e06a07afe0f@collabora.com> From: Neil Armstrong Content-Language: en-US, fr Autocrypt: addr=neil.armstrong@linaro.org; keydata= xsBNBE1ZBs8BCAD78xVLsXPwV/2qQx2FaO/7mhWL0Qodw8UcQJnkrWmgTFRobtTWxuRx8WWP GTjuhvbleoQ5Cxjr+v+1ARGCH46MxFP5DwauzPekwJUD5QKZlaw/bURTLmS2id5wWi3lqVH4 BVF2WzvGyyeV1o4RTCYDnZ9VLLylJ9bneEaIs/7cjCEbipGGFlfIML3sfqnIvMAxIMZrvcl9 qPV2k+KQ7q+aXavU5W+yLNn7QtXUB530Zlk/d2ETgzQ5FLYYnUDAaRl+8JUTjc0CNOTpCeik 80TZcE6f8M76Xa6yU8VcNko94Ck7iB4vj70q76P/J7kt98hklrr85/3NU3oti3nrIHmHABEB AAHNKk5laWwgQXJtc3Ryb25nIDxuZWlsLmFybXN0cm9uZ0BsaW5hcm8ub3JnPsLAkQQTAQoA OwIbIwULCQgHAwUVCgkICwUWAgMBAAIeAQIXgBYhBInsPQWERiF0UPIoSBaat7Gkz/iuBQJk Q5wSAhkBAAoJEBaat7Gkz/iuyhMIANiD94qDtUTJRfEW6GwXmtKWwl/mvqQtaTtZID2dos04 YqBbshiJbejgVJjy+HODcNUIKBB3PSLaln4ltdsV73SBcwUNdzebfKspAQunCM22Mn6FBIxQ GizsMLcP/0FX4en9NaKGfK6ZdKK6kN1GR9YffMJd2P08EO8mHowmSRe/ExAODhAs9W7XXExw UNCY4pVJyRPpEhv373vvff60bHxc1k/FF9WaPscMt7hlkbFLUs85kHtQAmr8pV5Hy9ezsSRa GzJmiVclkPc2BY592IGBXRDQ38urXeM4nfhhvqA50b/nAEXc6FzqgXqDkEIwR66/Gbp0t3+r yQzpKRyQif3OwE0ETVkGzwEIALyKDN/OGURaHBVzwjgYq+ZtifvekdrSNl8TIDH8g1xicBYp QTbPn6bbSZbdvfeQPNCcD4/EhXZuhQXMcoJsQQQnO4vwVULmPGgtGf8PVc7dxKOeta+qUh6+ SRh3vIcAUFHDT3f/Zdspz+e2E0hPV2hiSvICLk11qO6cyJE13zeNFoeY3ggrKY+IzbFomIZY 4yG6xI99NIPEVE9lNBXBKIlewIyVlkOaYvJWSV+p5gdJXOvScNN1epm5YHmf9aE2ZjnqZGoM Mtsyw18YoX9BqMFInxqYQQ3j/HpVgTSvmo5ea5qQDDUaCsaTf8UeDcwYOtgI8iL4oHcsGtUX oUk33HEAEQEAAcLAXwQYAQIACQUCTVkGzwIbDAAKCRAWmrexpM/4rrXiB/sGbkQ6itMrAIfn M7IbRuiSZS1unlySUVYu3SD6YBYnNi3G5EpbwfBNuT3H8//rVvtOFK4OD8cRYkxXRQmTvqa3 3eDIHu/zr1HMKErm+2SD6PO9umRef8V82o2oaCLvf4WeIssFjwB0b6a12opuRP7yo3E3gTCS KmbUuLv1CtxKQF+fUV1cVaTPMyT25Od+RC1K+iOR0F54oUJvJeq7fUzbn/KdlhA8XPGzwGRy 4zcsPWvwnXgfe5tk680fEKZVwOZKIEuJC3v+/yZpQzDvGYJvbyix0lHnrCzq43WefRHI5XTT QbM0WUIBIcGmq38+OgUsMYu4NzLu7uZFAcmp6h8g Organization: Linaro In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 01/09/2025 18:10, Sebastian Reichel wrote: > Hello Mark, > > On Mon, Sep 01, 2025 at 09:48:39AM -0400, Mark Pearson wrote: >> On Sun, Aug 31, 2025, at 5:28 PM, Sebastian Reichel wrote: >>> Introduce EC driver for the ThinkPad T14s Gen6 Snapdragon, which >>> is in theory compatible with ThinkPad ACPI. On Linux the system >>> is booted with device tree, which is not supported by the ThinkPad >>> ACPI driver. Also most of the hardware compatibility is handled >>> via ACPI tables, which are obviously not used when booting via >>> device tree. Thus adding DT compatibility to the existing driver >>> is not worth it (almost no code sharing). >>> >>> The driver currently exposes features, which are not available >>> via other means: >>> >>> * Extra Keys >>> * System LEDs >>> * Keyboard Backlight Control >>> >>> The driver has been developed by reading the ACPI DSDT. There >>> are some more features around thermal control, which are not >>> yet supported by the driver. >>> >> >> Thanks for working on this - it's great. > > It's a personal scratch your own itch project, as I daily drive the > machine. > >> I'll see if I can get the EC spec so I can do some checking on the >> values (I thought I had it already, but I can't find it). If this >> file can be used for other platforms then it might be good to >> rename the file to not be specific to the t14s? I'm curious if it >> can be used on the X13s or the Yoga platform. > > Maybe. I only have the T14s (apart of my older Intel/AMD ThinkPads, > which use the ACPI driver). The ACPI DSDT functions completley > abstract the lowlevel I2C interface, so in theory every ThinkPad > could have a completley different EC and still use the same ACPI > driver. So this needs to be checked per-device. Hopefully the low > level interface is similar in those, so that we don't need to spam > the kernel tree with multiple different EC drivers :) > >> Couple of notes >> - I do agree it doesn't make sense to add this to thinkpad_acpi. >> That file is too big anyway. >> - If there are other pieces like this where some detail of the >> platform is needed, please do let me know. I never got enough >> time to work on this platform directly, and it wasn't in our >> Linux program, but I do have access and support from the >> platform team for getting details on it. If I can help, so not >> too much reverse engineering is needed, I'm happy to. > > Thanks for the offer. > > I would be interested in bits around system suspend. Right now > support on X1E is limited to sending the CPU into suspend. Much of > the machine seems to be still powered. Right now the keyboard > backlight and all the status LEDs stay on and the LID + power led > does not go into the typical breathing pattern. Additionally I had > to disable wakeup capabilities for the EC interrupt, as closing the > LID generates an event and thus an interrupt, which wakes the > system. Obviousy that is undesired from user's perspective. My guess > is, that there might be some register to mask events, but I haven't > found it so far. Alternatively the EC might mask them automatically > when the system is send into suspend, which I also have not yet > figured out :) The only bit I know is, that EC register 0xE0 is > involved in modern standby. I was wondering if there's a command to poweroff the system when still plugged in ? The actual behavior does a PSCI poweroff using the PMICs but since the EC keeps the power on and is not aware we want to poweroff, if just reboots. Neil > > Apart from that and (probably) unrelated to the EC: I noticed that > accessing the built-in webcam (with the X1E camera patches from > Bryan O'Donoghue) does not enable the status LED. It would be > nice if you can check how that is wired, so that it can be enabled > when a camera stream is started. > > Greetings, > > -- Sebastian