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media: cec: add new tx/rx status bits to detect aborts/timeouts

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If the HDMI cable is disconnected or the CEC adapter is manually
unconfigured, then all pending transmits and wait-for-replies are
aborted. Signal this with new status bits (CEC_RX/TX_STATUS_ABORTED).

If due to (usually) a driver bug a transmit never ends (i.e. the
transmit_done was never called by the driver), then when this times
out the message is marked with CEC_TX_STATUS_TIMEOUT.

This should not happen and is an indication of a driver bug.

Without a separate status bit for this it was impossible to detect
this from userspace.

The 'transmit timed out' kernel message is now a warning, so this
should be more prominent in the kernel log as well.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Cc: <stable@vger.kernel.org>      # for v4.18 and up
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
This commit is contained in:
Hans Verkuil 2018-10-04 03:28:21 -04:00 • committed by Mauro Carvalho Chehab
parent 81e33279d1
commit 7ec2b3b941
3 changed files with 44 additions and 50 deletions
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3
include/uapi/linux/cec.h
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@ -152,10 +152,13 @@ static inline void cec_msg_set_reply_to(struct cec_msg *msg,
#define CEC_TX_STATUS_LOW_DRIVE (1 << 3)
#define CEC_TX_STATUS_ERROR (1 << 4)
#define CEC_TX_STATUS_MAX_RETRIES (1 << 5)
#define CEC_TX_STATUS_ABORTED (1 << 6)
#define CEC_TX_STATUS_TIMEOUT (1 << 7)
#define CEC_RX_STATUS_OK (1 << 0)
#define CEC_RX_STATUS_TIMEOUT (1 << 1)
#define CEC_RX_STATUS_FEATURE_ABORT (1 << 2)
#define CEC_RX_STATUS_ABORTED (1 << 3)
static inline int cec_msg_status_is_ok(const struct cec_msg *msg)
{