From: Nicolas Ferre nicolas.ferre@microchip.com
commit 85b8350ae99d1300eb6dc072459246c2649a8e50 upstream.
CAN0 and CAN1 instances share the same message ram configured at 0x210000 on sama5d2 Linux systems. According to current configuration of CAN0, we need 0x1c00 bytes so that the CAN1 don't overlap its message ram: 64 x RX FIFO0 elements => 64 x 72 bytes 32 x TXE (TX Event FIFO) elements => 32 x 8 bytes 32 x TXB (TX Buffer) elements => 32 x 72 bytes So a total of 7168 bytes (0x1C00).
Fix offset to match this needed size. Make the CAN0 message ram ioremap match exactly this size so that is easily understandable. Adapt CAN1 size accordingly.
Fixes: bc6d5d7666b7 ("ARM: dts: at91: sama5d2: add m_can nodes") Reported-by: Dan Sneddon dan.sneddon@microchip.com Signed-off-by: Nicolas Ferre nicolas.ferre@microchip.com Signed-off-by: Alexandre Belloni alexandre.belloni@bootlin.com Tested-by: Cristian Birsan cristian.birsan@microchip.com Cc: stable@vger.kernel.org # v4.13+ Link: https://lore.kernel.org/r/20201203091949.9015-1-nicolas.ferre@microchip.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- arch/arm/boot/dts/sama5d2.dtsi | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
--- a/arch/arm/boot/dts/sama5d2.dtsi +++ b/arch/arm/boot/dts/sama5d2.dtsi @@ -1294,7 +1294,7 @@
can0: can@f8054000 { compatible = "bosch,m_can"; - reg = <0xf8054000 0x4000>, <0x210000 0x4000>; + reg = <0xf8054000 0x4000>, <0x210000 0x1c00>; reg-names = "m_can", "message_ram"; interrupts = <56 IRQ_TYPE_LEVEL_HIGH 7>, <64 IRQ_TYPE_LEVEL_HIGH 7>; @@ -1485,7 +1485,7 @@
can1: can@fc050000 { compatible = "bosch,m_can"; - reg = <0xfc050000 0x4000>, <0x210000 0x4000>; + reg = <0xfc050000 0x4000>, <0x210000 0x3800>; reg-names = "m_can", "message_ram"; interrupts = <57 IRQ_TYPE_LEVEL_HIGH 7>, <65 IRQ_TYPE_LEVEL_HIGH 7>; @@ -1495,7 +1495,7 @@ assigned-clocks = <&can1_gclk>; assigned-clock-parents = <&utmi>; assigned-clock-rates = <40000000>; - bosch,mram-cfg = <0x1100 0 0 64 0 0 32 32>; + bosch,mram-cfg = <0x1c00 0 0 64 0 0 32 32>; status = "disabled"; };