linux-kernel - [RFC PATCH 0/2] Introduce Tx doorbell with ACK

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Date:   Mon, 10 Jun 2019 22:16:07 +0800
From:   daniel.baluta@....com
To:     jassisinghbrar@...il.com, o.rempel@...gutronix.de
Cc:     shawnguo@...nel.org, s.hauer@...gutronix.de, linux-imx@....com,
        kernel@...gutronix.de, festevam@...il.com,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        aisheng.dong@....com, Daniel Baluta <daniel.baluta@....com>
Subject: [RFC PATCH 0/2] Introduce Tx doorbell with ACK

From: Daniel Baluta <daniel.baluta@....com>

We need this in order to implement the communication protocol
between Linux kernel SOF IPC layer and DSP firmware found on i.MX8 boards.

First patch is just a bugfix and can be merged as it is.

The second patch is just a RFC to open the discussion on how to use the i.MX
mailbox API in order to communicate with the DSP. I want to know if this
scenario can be supported by the mailbox abstraction of MU or should I
go back and directly access MU registers.

We need to have two MU channels:
	- channel #0, Host sends notification (via GIR) to DSP and gets a reply (via GIP)
	- channel #1, DSP sends message to Host (via GIR) and gets a reply (via GIP).

The details of the protocol can be found in patch 2.

Daniel Baluta (2):
  mailbox: imx: Clear GIEn bit at shutdown
  imx: mailbox: Introduce TX doorbell with ACK

 drivers/mailbox/imx-mailbox.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

-- 
2.17.1