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Commit adbd77b5 authored by Wolfram Sang's avatar Wolfram Sang Committed by Wolfram Sang
Browse files

i2c: rcar: skip DMA if buffer is not safe 



This HW is prone to races, so it needs to setup new messages in irq
context. That means we can't alloc bounce buffers if a message buffer is
not DMA safe. So, in that case, simply fall back to PIO.

Reviewed-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: default avatarWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent fe23aa9a

drivers/i2c/busses/i2c-rcar.c

+1 −1
Original line number Diff line number Diff line
@@ -359,7 +359,7 @@ static void rcar_i2c_dma(struct rcar_i2c_priv *priv) 
	int len;



	/* Do not use DMA if it's not available or for messages < 8 bytes */

	if (IS_ERR(chan) || msg->len < 8)

	if (IS_ERR(chan) || msg->len < 8 || !(msg->flags & I2C_M_DMA_SAFE))

		return;



	if (read) {