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| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2015-03-02 14:58:55 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2015-03-06 20:29:03 +0000 |
| commit | 45746e82cf89f432f9c986a52137d8a64b78aba9 (patch) | |
| tree | d9df29e0bf19318698df1e045caa9c0317a9d3f1 /drivers/spi/spi-dw.c | |
| parent | 1a18f9f753209977450c94dcd354dd4fa5370966 (diff) | |
| download | linux-0-day-45746e82cf89f432f9c986a52137d8a64b78aba9.tar.gz linux-0-day-45746e82cf89f432f9c986a52137d8a64b78aba9.tar.xz | |
spi: dw: make sure SPI controller is enabled
The error handling is partially broken since the controller is disabled on
error and is not re-enabled until condition occurs, i.e. mode (poll, PIO/DMA),
chip (cs_change), or speed (clk_div) is changed. In the result of these changes
we will have a predictable state of the SPi controller independently on how
successfull was a previous transfer.
The patch disables interrupts and re-enables the SPI controller wherever it
needs to be done. Thus most of the time the SPI controller is kept enabled. The
runtime PM, when it will be implemented, must take care of the controller
disabling and re-enabling.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-dw.c')
| -rw-r--r-- | drivers/spi/spi-dw.c | 7 |
1 files changed, 2 insertions, 5 deletions
diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c index 281121f001388..321965607fc04 100644 --- a/drivers/spi/spi-dw.c +++ b/drivers/spi/spi-dw.c @@ -272,8 +272,7 @@ static void giveback(struct dw_spi *dws) static void int_error_stop(struct dw_spi *dws, const char *msg) { - /* Stop the hw */ - spi_enable_chip(dws, 0); + spi_reset_chip(dws); dev_err(&dws->master->dev, "%s\n", msg); dws->cur_msg->state = ERROR_STATE; @@ -606,9 +605,7 @@ static void dw_spi_cleanup(struct spi_device *spi) /* Restart the controller, disable all interrupts, clean rx fifo */ static void spi_hw_init(struct device *dev, struct dw_spi *dws) { - spi_enable_chip(dws, 0); - spi_mask_intr(dws, 0xff); - spi_enable_chip(dws, 1); + spi_reset_chip(dws); /* * Try to detect the FIFO depth if not set by interface driver, |