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Message-Id: <20240906-lpm-v6-10-constraints-pmdomain-v4-0-4055557fafbc@baylibre.com> Date: Fri, 06 Sep 2024 09:14:48 -0700 From: Kevin Hilman <khilman@...libre.com> To: Ulf Hansson <ulf.hansson@...aro.org>, linux-pm@...r.kernel.org Cc: Nishanth Menon <nm@...com>, Vibhore Vardhan <vibhore@...com>, Dhruva Gole <d-gole@...com>, Akashdeep Kaur <a-kaur@...com>, Sebin Francis <sebin.francis@...com>, Markus Schneider-Pargmann <msp@...libre.com>, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, Kevin Hilman <khilman@...libre.com> Subject: [PATCH v4 0/3] pmdomain: ti_sci: collect and send low-power mode constraints The latest (10.x) version of the firmware for the PM co-processor (aka device manager, or DM) adds support for a "managed" mode, where the DM firmware will select the specific low power state which is entered when Linux requests a system-wide suspend. In this mode, the DM will always attempt the deepest low-power state available for the SoC. However, Linux (or OSes running on other cores) may want to constrain the DM for certain use cases. For example, the deepest state may have a wakeup/resume latency that is too long for certain use cases. Or, some wakeup-capable devices may potentially be powered off in deep low-power states, but if one of those devices is enabled as a wakeup source, it should not be powered off. These kinds of constraints are are already known in Linux by the use of existing APIs such as per-device PM QoS and device wakeup APIs, but now we need to communicate these constraints to the DM. For TI SoCs with TI SCI support, all DM-managed devices will be connected to a TI SCI PM domain. So the goal of this series is to use the PM domain driver for TI SCI devices to collect constraints, and communicate them to the DM via the new TI SCI APIs. This is all managed by TI SCI PM domain code. No new APIs are needed by Linux drivers. Any device that is managed by TI SCI will be checked for QoS constraints or wakeup capability and the constraints will be collected and sent to the DM. This series depends on the support for the new TI SCI APIs (v10) and was also tested with this series to update 8250_omap serial support for AM62x[2]. [1] https://lore.kernel.org/all/20240801195422.2296347-1-msp@baylibre.com [2] https://lore.kernel.org/all/20240807141227.1093006-1-msp@baylibre.com/ Signed-off-by: Kevin Hilman <khilman@...libre.com> --- Changes in v4: - fixed missing return in wakeirq error path - updated trailers with reviewed & tested tags - Link to v3: https://lore.kernel.org/r/20240905-lpm-v6-10-constraints-pmdomain-v3-0-e359cbb39654@baylibre.com Changes in v3: - change latency set functions to static void - Link to v2: https://lore.kernel.org/r/20240819-lpm-v6-10-constraints-pmdomain-v2-0-461325a6008f@baylibre.com Changes in v2: - To simplify this version a bit, drop the pmdomain ->power_off() changes. Constraints only sent during ->suspend() path. The pmdomain path was an optimization that may be added back later. - With the above simplification, drop the extra state variables that had been added to keep track of constraint status. - Link to v1: https://lore.kernel.org/r/20240805-lpm-v6-10-constraints-pmdomain-v1-0-d186b68ded4c@baylibre.com --- Kevin Hilman (3): pmdomain: ti_sci: add per-device latency constraint management pmdomain: ti_sci: add wakeup constraint management pmdomain: ti_sci: handle wake IRQs for IO daisy chain wakeups drivers/pmdomain/ti/ti_sci_pm_domains.c | 72 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 72 insertions(+) --- base-commit: ad7eb1b6b92ee0c959a0a6ae846ddadd7a79ea64 change-id: 20240802-lpm-v6-10-constraints-pmdomain-f33df5aef449 prerequisite-message-id: <20240904194229.109886-1-msp@...libre.com> prerequisite-patch-id: a0efbf22e69d23dba8bb96db4032ca644935709b prerequisite-patch-id: a9b6a17956ff6a09a6ed19c35df9018e28b5059b prerequisite-patch-id: 2999da190c1ba63aabecc55fae501d442e4e0d7b prerequisite-patch-id: 69a741b9c81d7990937483fc481aafa70e67669d prerequisite-patch-id: 945b15416a011cb40007c5d95561786c1776bb98 Best regards, -- Kevin Hilman <khilman@...libre.com>
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