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soc: apple: rtkit: Add apple_rtkit_poll

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This allows a client to receive messages in atomic context, by polling.

Signed-off-by: Hector Martin <marcan@marcan.st>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Reviewed-by: Sven Peter <sven@svenpeter.dev>
Reviewed-by: Eric Curtin <ecurtin@redhat.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Hector Martin 2022-09-14 09:34:31 +01:00 committed by Arnd Bergmann
parent 387969b7ab
commit f5a5e83379
2 changed files with 18 additions and 0 deletions
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6
drivers/soc/apple/rtkit.c
View File

@ -660,6 +660,12 @@ int apple_rtkit_send_message_wait(struct apple_rtkit *rtk, u8 ep, u64 message,
}
EXPORT_SYMBOL_GPL(apple_rtkit_send_message_wait);
int apple_rtkit_poll(struct apple_rtkit *rtk)
{
return mbox_client_peek_data(rtk->mbox_chan);
}
EXPORT_SYMBOL_GPL(apple_rtkit_poll);
int apple_rtkit_start_ep(struct apple_rtkit *rtk, u8 endpoint)
{
u64 msg;

12
include/linux/soc/apple/rtkit.h
View File

@ -152,4 +152,16 @@ int apple_rtkit_send_message(struct apple_rtkit *rtk, u8 ep, u64 message,
int apple_rtkit_send_message_wait(struct apple_rtkit *rtk, u8 ep, u64 message,
unsigned long timeout, bool atomic);
/*
* Process incoming messages in atomic context.
* This only guarantees that messages arrive as far as the recv_message_early
* callback; drivers expecting to handle incoming messages synchronously
* by calling this function must do it that way.
* Will return 1 if some data was processed, 0 if none was, or a
* negative error code on failure.
*
* @rtk: RTKit reference
*/
int apple_rtkit_poll(struct apple_rtkit *rtk);
#endif /* _LINUX_APPLE_RTKIT_H_ */