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>

1 files changed, 9 insertions, 4 deletions

diff --git a/drivers/net/can/mcp251x.c b/drivers/net/can/mcp251x.c
index 7f8aa4ce02c5..c664be261e98 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? */