can: peak_canfd: fix firmware < v3.3.0: limit allocation to 32-bit DMA addr only

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The DMA logic in firmwares < v3.3.0 embedded in the PCAN-PCIe FD cards
family is not capable of handling a mix of 32-bit and 64-bit logical
addresses. If the board is equipped with 2 or 4 CAN ports, then such a
situation might lead to a PCIe Bus Error "Malformed TLP" packet
as well as "irq xx: nobody cared" issue.

This patch adds a workaround that requests only 32-bit DMA addresses
when these might be allocated outside of the 4 GB area.

This issue has been fixed in firmware v3.3.0 and next.

Signed-off-by: Stephane Grosjean <s.grosjean@peak-system.com>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

...

This commit is contained in:

Stephane Grosjean 2018-06-21 15:23:31 +02:00 • committed by Marc Kleine-Budde

parent c9ce1fa1c2

commit 5d4c94ed9f

1 changed files with 19 additions and 0 deletions

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19

drivers/net/can/peak_canfd/peak_pciefd_main.c

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