linux-kernel - [PATCH net 0/4] Fix bit timings for m_can

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Date:   Mon, 15 Nov 2021 10:18:48 +0100
From:   Matthias Schiffer <matthias.schiffer@...tq-group.com>
To:     Chandrasekar Ramakrishnan <rcsekar@...sung.com>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        Marc Kleine-Budde <mkl@...gutronix.de>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        "Felipe Balbi (Intel)" <balbi@...nel.org>,
        Jarkko Nikula <jarkko.nikula@...ux.intel.com>,
        linux-can@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Matthias Schiffer <matthias.schiffer@...tq-group.com>
Subject: [PATCH net 0/4] Fix bit timings for m_can_pci (Elkhart Lake)

This series fixes two issues we found with the setup of the CAN
controller of Intel Elkhart Lake CPUs:

- Patch 1 fixes an incorrect reference clock rate, which caused the
  configured and the actual bitrate always to differ by a factor of 2.
- Patches 2-4 fix a deviation between the driver and the documentation.
  We did not actually see issues without these patches, however we did
  only superficial testing and may just not have hit the specific
  bittiming values that violate the documented limits.


Matthias Schiffer (4):
  can: m_can: pci: fix incorrect reference clock rate
  Revert "can: m_can: remove support for custom bit timing"
  can: m_can: make custom bittiming fields const
  can: m_can: pci: use custom bit timings for Elkhart Lake

 drivers/net/can/m_can/m_can.c     | 24 ++++++++++++----
 drivers/net/can/m_can/m_can.h     |  3 ++
 drivers/net/can/m_can/m_can_pci.c | 48 ++++++++++++++++++++++++++++---
 3 files changed, 65 insertions(+), 10 deletions(-)

-- 
2.17.1