Commit c9f89c3f authored Mar 21, 2018 by Shunyong Yang Committed by Alex Williamson Mar 22, 2018

vfio-mdev/samples: change RDI interrupt condition



When FIFO mode is enabled, the receive data available interrupt
(UART_IIR_RDI in code) should be triggered when the number of data
in FIFO is equal or larger than interrupt trigger level.

This patch changes the trigger level check to ensure multiple bytes
received from upper layer can trigger RDI interrupt correctly.

Cc: Joey Zheng <yu.zheng@hxt-semitech.com>
Signed-off-by: Shunyong Yang <shunyong.yang@hxt-semitech.com>
Reviewed by: Kirti Wankhede <kwankhede@nvidia.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

parent 6bd06f5a

samples/vfio-mdev/mtty.c

+1 −1

Original line number	Diff line number	Diff line
		@@ -534,7 +534,7 @@ static void handle_bar_read(unsigned int index, struct mdev_state *mdev_state,

		/* Interrupt priority 2: Fifo trigger level reached */
		if ((ier & UART_IER_RDI) &&
		(mdev_state->s[index].rxtx.count ==
		(mdev_state->s[index].rxtx.count >=
		mdev_state->s[index].intr_trigger_level))
		*buf \|= UART_IIR_RDI;

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