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greybus: add write retry support for i2c

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It is expected that i2c writes may fail, and in that case the driver
simply retries some number of times before actually treating it as a
failure.  Define a GB_OP_RETRY status, which is interpreted by the
i2c driver as an indication a retry is in order.  We just translate
that into an EAGAIN error passed back to the i2c core.

Signed-off-by: Alex Elder <elder@linaro.org>
Signed-off-by: Greg Kroah-Hartman <greg@kroah.com>
This commit is contained in:
Alex Elder 2014-10-17 05:09:21 -05:00 committed by Greg Kroah-Hartman
parent bb2e1c9626
commit d75286852b
2 changed files with 9 additions and 4 deletions
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10
drivers/staging/greybus/i2c-gb.c
View File

@ -382,9 +382,13 @@ static int gb_i2c_transfer_operation(struct gb_i2c_device *gb_i2c_dev,
response = operation->response_payload;
if (response->status) {
gb_connection_err(connection, "transfer response %hhu",
response->status);
ret = -EIO;
if (response->status == GB_OP_RETRY) {
ret = -EAGAIN;
} else {
gb_connection_err(connection, "transfer response %hhu",
response->status);
ret = -EIO;
}
} else {
gb_i2c_transfer_response(msgs, msg_count, response->data);
ret = msg_count;

3
drivers/staging/greybus/operation.h
View File

@ -16,7 +16,8 @@ enum gb_operation_status {
GB_OP_INVALID = 1,
GB_OP_NO_MEMORY = 2,
GB_OP_INTERRUPTED = 3,
GB_OP_PROTOCOL_BAD = 4,
GB_OP_RETRY = 4,
GB_OP_PROTOCOL_BAD = 5,
};
/*