linux-kernel - [PATCH v3 0/6] can: c_can: add support to 64 message objects

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Date:   Sun, 28 Feb 2021 11:38:49 +0100
From:   Dario Binacchi <dariobin@...ero.it>
To:     linux-kernel@...r.kernel.org
Cc:     Federico Vaga <federico.vaga@...il.com>,
        Alexander Stein <alexander.stein@...tec-electronic.com>,
        Dario Binacchi <dariobin@...ero.it>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Marc Kleine-Budde <mkl@...gutronix.de>,
        Oliver Hartkopp <socketcan@...tkopp.net>,
        Vincent Mailhol <mailhol.vincent@...adoo.fr>,
        Wolfgang Grandegger <wg@...ndegger.com>,
        YueHaibing <yuehaibing@...wei.com>,
        Zhang Qilong <zhangqilong3@...wei.com>,
        linux-can@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH v3 0/6] can: c_can: add support to 64 message objects


The D_CAN controller supports up to 128 messages. Until now the driver
only managed 32 messages although Sitara processors and DRA7 SOC can
handle 64.

The series was tested on a beaglebone board.

Note:
I have not changed the type of tx_field (belonging to the c_can_priv
structure) to atomic64_t because I think the atomic_t type has size
of at least 32 bits on x86 and arm, which is enough to handle 64
messages.
http://marc.info/?l=linux-can&m=139746476821294&w=2 reports the results
of tests performed just on x86 and arm architectures.

Changes in v3:
- Use unsigned int instead of int as type of the msg_obj_* fields
  in the c_can_priv structure.
- Replace (u64)1 with 1UL in msg_obj_rx_mask setting.
- Use unsigned int instead of int as type of the msg_obj_num field
  in c_can_driver_data and c_can_pci_data structures.

Changes in v2:
- Fix compiling error reported by kernel test robot.
- Add Reported-by tag.
- Pass larger size to alloc_candev() routine to avoid an additional
  memory allocation/deallocation.
- Add message objects number to PCI driver data.

Dario Binacchi (6):
  can: c_can: remove unused code
  can: c_can: fix indentation
  can: c_can: fix control interface used by c_can_do_tx
  can: c_can: use 32-bit write to set arbitration register
  can: c_can: prepare to up the message objects number
  can: c_can: add support to 64 message objects

 drivers/net/can/c_can/c_can.c          | 77 +++++++++++++++-----------
 drivers/net/can/c_can/c_can.h          | 32 +++++------
 drivers/net/can/c_can/c_can_pci.c      |  6 +-
 drivers/net/can/c_can/c_can_platform.c |  6 +-
 4 files changed, 68 insertions(+), 53 deletions(-)

-- 
2.17.1