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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>
This commit is contained in:
Shunyong Yang 2018-03-21 12:46:23 -06:00 committed by Alex Williamson
parent 6bd06f5a48
commit c9f89c3f87
1 changed files with 1 additions and 1 deletions
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2
samples/vfio-mdev/mtty.c
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@ -534,7 +534,7 @@ static void handle_bar_read(unsigned int index, struct mdev_state *mdev_state,
/* Interrupt priority 2: Fifo trigger level reached */ /* Interrupt priority 2: Fifo trigger level reached */
if ((ier & UART_IER_RDI) && if ((ier & UART_IER_RDI) &&
(mdev_state->s[index].rxtx.count == (mdev_state->s[index].rxtx.count >=
mdev_state->s[index].intr_trigger_level)) mdev_state->s[index].intr_trigger_level))
*buf |= UART_IIR_RDI; *buf |= UART_IIR_RDI;