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| author | Marc Kleine-Budde <mkl@pengutronix.de> | 2013-10-04 12:52:36 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-11-13 07:01:48 +0400 |
| commit | f49c173bb693fa2aea6c96c931f9449ce4885d7b (patch) | |
| tree | 6614dba7f2bb2621417c10eda48e790e3eb376bb /samples | |
| parent | 20b2a1eb2de54d0fce4dee198546cc448589dad8 (diff) | |
| download | linux-f49c173bb693fa2aea6c96c931f9449ce4885d7b.tar.xz | |
can: flexcan: flexcan_chip_start: fix regression, mark one MB for TX and abort pending TX
commit d5a7b406c529e4595ce03dc8f6dcf7fa36f106fa upstream.
In patch
0d1862e can: flexcan: fix flexcan_chip_start() on imx6
the loop in flexcan_chip_start() that iterates over all mailboxes after the
soft reset of the CAN core was removed. This loop put all mailboxes (even the
ones marked as reserved 1...7) into EMPTY/INACTIVE mode. On mailboxes 8...63,
this aborts any pending TX messages.
After a cold boot there is random garbage in the mailboxes, which leads to
spontaneous transmit of CAN frames during first activation. Further if the
interface was disabled with a pending message (usually due to an error
condition on the CAN bus), this message is retransmitted after enabling the
interface again.
This patch fixes the regression by:
1) Limiting the maximum number of used mailboxes to 8, 0...7 are used by the RX
FIFO, 8 is used by TX.
2) Marking the TX mailbox as EMPTY/INACTIVE, so that any pending TX of that
mailbox is aborted.
Cc: Lothar Waßmann <LW@KARO-electronics.de>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'samples')
0 files changed, 0 insertions, 0 deletions