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authorWolfram Sang <wsa+renesas@sang-engineering.com>2017-11-04 21:20:09 +0100
committerWolfram Sang <wsa@the-dreams.de>2017-12-03 21:25:00 +0100
commitadbd77b589d0345cfc42f1ae0b3414e62a2bf866 (patch)
treed06e192b7c1a94926d4b8f79f515cabb37bbee1e /drivers/i2c
parentfe23aa9a1670b8800b251fc0400425e765c81880 (diff)
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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: Jonathan Cameron <Jonathan.Cameron@huawei.com> Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/busses/i2c-rcar.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/i2c/busses/i2c-rcar.c b/drivers/i2c/busses/i2c-rcar.c
index 15d764afec3b..8a2ae3e6c561 100644
--- a/drivers/i2c/busses/i2c-rcar.c
+++ b/drivers/i2c/busses/i2c-rcar.c
@@ -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) {