From: Andy Shevchenko Date: Fri, 27 Feb 2015 15:34:15 +0000 (+0200) Subject: spi: introduce master->handle_err() callback X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=b716c4ffc6a2b0bf;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git 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 Signed-off-by: Mark Brown --- diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index c64a3e59fce3..31d4d9d997e2 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -851,6 +851,9 @@ out: 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 ed9489d893a4..4eaac3a5227b 100644 --- a/include/linux/spi/spi.h +++ b/include/linux/spi/spi.h @@ -294,6 +294,8 @@ static inline void spi_unregister_driver(struct spi_driver *sdrv) * 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 @@ struct spi_master { 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;