leandrof/linux
1
0
Fork 0
forked from Minki/linux
Code Issues Pull Requests Packages Projects Releases Wiki Activity

i2c: at91: Read all available bytes at once

Browse Source 
With FIFO enabled it is possible to read multiple bytes
at once in the interrupt handler as long as RXRDY is
set. This may also reduce the number of interrupts.

This patch polls RXRDY and reads all available bytes at
once.

Signed-off-by: David Engraf <david.engraf@sysgo.com>
Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com>
[wsa: reformatted comment]
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
David Engraf 2018-04-26 11:53:14 +02:00 committed by Wolfram Sang
parent 562de4ff4c
commit e8f39e9fc0
1 changed files with 10 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
drivers/i2c/busses/i2c-at91.c
View File

@ -518,8 +518,16 @@ static irqreturn_t atmel_twi_interrupt(int irq, void *dev_id)
* the RXRDY interrupt first in order to not keep garbage data in the
* Receive Holding Register for the next transfer.
*/
if (irqstatus & AT91_TWI_RXRDY)
if (irqstatus & AT91_TWI_RXRDY) {
/*
* Read all available bytes at once by polling RXRDY usable w/
* and w/o FIFO. With FIFO enabled we could also read RXFL and
* avoid polling RXRDY.
*/
do {
at91_twi_read_next_byte(dev);
} while (at91_twi_read(dev, AT91_TWI_SR) & AT91_TWI_RXRDY);
}
/*
* When a NACK condition is detected, the I2C controller sets the NACK,