spi: introduce master->handle_err() callback
This callback would be useful to handle an error that occurs in the generic
implementation of transfer_one_message(). The good candidate for this is to
drain FIFO and / or to terminate DMA transfers when timeout happened.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index c64a3e5..31d4d9d 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -851,6 +851,9 @@
if (msg->status == -EINPROGRESS)
msg->status = ret;
+ if (msg->status)
+ master->handle_err(master, msg);
+
spi_finalize_current_message(master);
return ret;
diff --git a/include/linux/spi/spi.h b/include/linux/spi/spi.h
index ed9489d..4eaac3a5 100644
--- a/include/linux/spi/spi.h
+++ b/include/linux/spi/spi.h
@@ -294,6 +294,8 @@
* transfer_one_message are mutually exclusive; when both
* are set, the generic subsystem does not call your
* transfer_one callback.
+ * @handle_err: the subsystem calls the driver to handle and error that occurs
+ * in the generic implementation of transfer_one_message().
* @unprepare_message: undo any work done by prepare_message().
* @cs_gpios: Array of GPIOs to use as chip select lines; one per CS
* number. Any individual value may be -ENOENT for CS lines that
@@ -448,6 +450,8 @@
void (*set_cs)(struct spi_device *spi, bool enable);
int (*transfer_one)(struct spi_master *master, struct spi_device *spi,
struct spi_transfer *transfer);
+ void (*handle_err)(struct spi_master *master,
+ struct spi_message *message);
/* gpio chip select */
int *cs_gpios;
