diff options
| author | Heiner Kallweit <hkallweit1@gmail.com> | 2016-10-27 22:28:02 +0300 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2016-10-28 21:39:46 +0300 |
| commit | db1b049fad8b12062edffade8272d604b4019eb7 (patch) | |
| tree | 79bda1bb8140ab2d4235a691143904fe2983dc79 | |
| parent | b3bec5f95f73520feb05b90244522f24546e96aa (diff) | |
| download | linux-db1b049fad8b12062edffade8272d604b4019eb7.tar.xz | |
spi: fsl-espi: extend and improve transfer error handling
Extend and improve transfer error handling
- in case of timeout report also number of remaining rx bytes
- in case of timeout return ETIMEDOUT instead of EMSGSIZE
- add sanity checks after all bytes have been sent / read:
- check that HW has flag SPIE_DON set
- check that RX / TX FIFO are empty
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
| -rw-r--r-- | drivers/spi/spi-fsl-espi.c | 22 |
1 files changed, 17 insertions, 5 deletions
diff --git a/drivers/spi/spi-fsl-espi.c b/drivers/spi/spi-fsl-espi.c index d5506852e63c..a9593f9691ec 100644 --- a/drivers/spi/spi-fsl-espi.c +++ b/drivers/spi/spi-fsl-espi.c @@ -289,13 +289,13 @@ static int fsl_espi_bufs(struct spi_device *spi, struct spi_transfer *t) ret = wait_for_completion_timeout(&mpc8xxx_spi->done, 2 * HZ); if (ret == 0) dev_err(mpc8xxx_spi->dev, - "Transaction hanging up (left %u bytes)\n", - mpc8xxx_spi->tx_len); + "Transaction hanging up (left %u tx bytes, %u rx bytes)\n", + mpc8xxx_spi->tx_len, mpc8xxx_spi->rx_len); /* disable rx ints */ fsl_espi_write_reg(mpc8xxx_spi, ESPI_SPIM, 0); - return mpc8xxx_spi->tx_len > 0 ? -EMSGSIZE : 0; + return ret == 0 ? -ETIMEDOUT : 0; } static int fsl_espi_trans(struct spi_message *m, struct spi_transfer *trans) @@ -469,8 +469,20 @@ static void fsl_espi_cpu_irq(struct mpc8xxx_spi *mspi, u32 events) if (mspi->tx_len) fsl_espi_fill_tx_fifo(mspi, events); - if (!mspi->tx_len && !mspi->rx_len) - complete(&mspi->done); + if (mspi->tx_len || mspi->rx_len) + return; + + /* we're done, but check for errors before returning */ + events = fsl_espi_read_reg(mspi, ESPI_SPIE); + + if (!(events & SPIE_DON)) + dev_err(mspi->dev, + "Transfer done but SPIE_DON isn't set!\n"); + + if (SPIE_RXCNT(events) || SPIE_TXCNT(events) != FSL_ESPI_FIFO_SIZE) + dev_err(mspi->dev, "Transfer done but rx/tx fifo's aren't empty!\n"); + + complete(&mspi->done); } static irqreturn_t fsl_espi_irq(s32 irq, void *context_data) |