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During the system suspend path we must set all queues to operate in polled mode as it is possible for any protocol built using this mailbox, such as TISCI, to require communication during the no irq phase of suspend, and we cannot rely on interrupts there. Polled mode is implemented by allowing the mailbox user to define an RX channel as part of the message that is sent which is what gets polled for a response. If polled mode is enabled, this will immediately be polled for a response at the end of the mailbox send_data op before returning success for the data send or timing out if no response is received. Finally, to ensure polled mode is always enabled during system suspend, iterate through all queues to set RX queues to polled mode during system suspend and disable polled mode for all in the resume handler. Signed-off-by: Dave Gerlach <d-gerlach@ti.com> Signed-off-by: Jassi Brar <jaswinder.singh@linaro.org>
41 lines
1.3 KiB
C
41 lines
1.3 KiB
C
/*
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* Texas Instruments' Message Manager
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*
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* Copyright (C) 2015-2022 Texas Instruments Incorporated - https://www.ti.com/
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* Nishanth Menon
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed "as is" WITHOUT ANY WARRANTY of any
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* kind, whether express or implied; without even the implied warranty
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* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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#ifndef TI_MSGMGR_H
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#define TI_MSGMGR_H
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struct mbox_chan;
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/**
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* struct ti_msgmgr_message - Message Manager structure
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* @len: Length of data in the Buffer
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* @buf: Buffer pointer
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* @chan_rx: Expected channel for response, must be provided to use polled rx
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* @timeout_rx_ms: Timeout value to use if polling for response
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*
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* This is the structure for data used in mbox_send_message
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* the length of data buffer used depends on the SoC integration
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* parameters - each message may be 64, 128 bytes long depending
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* on SoC. Client is supposed to be aware of this.
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*/
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struct ti_msgmgr_message {
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size_t len;
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u8 *buf;
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struct mbox_chan *chan_rx;
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int timeout_rx_ms;
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};
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#endif /* TI_MSGMGR_H */
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