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authorMarc Kleine-Budde <mkl@pengutronix.de>2010-10-04 12:09:31 +0200
committerMarc Kleine-Budde <mkl@pengutronix.de>2010-10-18 15:19:55 +0200
commit9c473fc33915ddb14b71a4929c838c22b20a24ce (patch)
treed361dea60572ae6417089e566518e1db940fbade /drivers/net/can
parentbeab675cb45f28a4a76780e43fd03e33bc773555 (diff)
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can: mcp251x: optimize 2515, rx int gets cleared automatically
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> Acked-by: Wolfgang Grandegger <wg@grandegger.com>
Diffstat (limited to 'drivers/net/can')
-rw-r--r--drivers/net/can/mcp251x.c13
1 files changed, 9 insertions, 4 deletions
diff --git a/drivers/net/can/mcp251x.c b/drivers/net/can/mcp251x.c
index 7f8aa4ce02c..c664be261e9 100644
--- a/drivers/net/can/mcp251x.c
+++ b/drivers/net/can/mcp251x.c
@@ -793,15 +793,20 @@ static irqreturn_t mcp251x_can_ist(int irq, void *dev_id)
/* receive buffer 0 */
if (intf & CANINTF_RX0IF) {
mcp251x_hw_rx(spi, 0);
- /* Free one buffer ASAP */
- mcp251x_write_bits(spi, CANINTF, intf & CANINTF_RX0IF,
- 0x00);
+ /*
+ * Free one buffer ASAP
+ * (The MCP2515 does this automatically.)
+ */
+ if (mcp251x_is_2510(spi))
+ mcp251x_write_bits(spi, CANINTF, CANINTF_RX0IF, 0x00);
}
/* receive buffer 1 */
if (intf & CANINTF_RX1IF) {
mcp251x_hw_rx(spi, 1);
- clear_intf |= CANINTF_RX1IF;
+ /* the MCP2515 does this automatically */
+ if (mcp251x_is_2510(spi))
+ clear_intf |= CANINTF_RX1IF;
}
/* any error or tx interrupt we need to clear? */