target/linux/lantiq/patches-4.9/0090-spi-add-transfer_status-callback.patch

   1 --- a/drivers/spi/spi.c
   2 +++ b/drivers/spi/spi.c
   3 @@ -1013,6 +1013,20 @@ static int spi_transfer_one_message(stru
   4                                                                  msecs_to_jiffies(ms));
   5                         }
   6
   7 +                       if (master->transfer_status) {
   8 +                               ret = master->transfer_status(master, ms);
   9 +                               if (ret) {
  10 +                                       SPI_STATISTICS_INCREMENT_FIELD(statm,
  11 +                                                                      errors);
  12 +                                       SPI_STATISTICS_INCREMENT_FIELD(stats,
  13 +                                                                      errors);
  14 +                                       dev_err(&msg->spi->dev,
  15 +                                               "SPI transfer status: %d\n",
  16 +                                               ret);
  17 +                                       goto out;
  18 +                               }
  19 +                       }
  20 +
  21                         if (ms == 0) {
  22                                 SPI_STATISTICS_INCREMENT_FIELD(statm,
  23                                                                timedout);
  24 --- a/include/linux/spi/spi.h
  25 +++ b/include/linux/spi/spi.h
  26 @@ -370,6 +370,8 @@ static inline void spi_unregister_driver
  27   *                    transfer_one_message are mutually exclusive; when both
  28   *                    are set, the generic subsystem does not call your
  29   *                    transfer_one callback.
  30 + * @transfer_status: This callback allows the driver to return an error code
  31 + *                  in case the scheduled single spi transfer failed.
  32   * @handle_err: the subsystem calls the driver to handle an error that occurs
  33   *             in the generic implementation of transfer_one_message().
  34   * @unprepare_message: undo any work done by prepare_message().
  35 @@ -546,6 +548,7 @@ struct spi_master {
  36         void (*set_cs)(struct spi_device *spi, bool enable);
  37         int (*transfer_one)(struct spi_master *master, struct spi_device *spi,
  38                             struct spi_transfer *transfer);
  39 +       int (*transfer_status)(struct spi_master *master, unsigned long timeout);
  40         void (*handle_err)(struct spi_master *master,
  41                            struct spi_message *message);
  42