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spi: dw: Clear IRQ status on DW SPI controller reset

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It turns out the IRQ status isn't cleared after switching the controller
off and getting it back on, which may cause raising false error interrupts
if controller has been unsuccessfully used by, for instance, a bootloader
before the driver is loaded. Let's explicitly clear the interrupts status
in the dedicated controller reset method.

Signed-off-by: Serge Semin <Sergey.Semin@baikalelectronics.ru>
Link: https://lore.kernel.org/r/20200920112914.26501-6-Sergey.Semin@baikalelectronics.ru
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Serge Semin 2020-09-20 14:28:49 +03:00 committed by Mark Brown
parent 8225c1c9a0
commit a128f6ecd5
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1 changed files with 4 additions and 3 deletions
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7
drivers/spi/spi-dw.h
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@ -230,14 +230,15 @@ static inline void spi_umask_intr(struct dw_spi *dws, u32 mask)
}
/*
* This does disable the SPI controller, interrupts, and re-enable the
* controller back. Transmit and receive FIFO buffers are cleared when the
* device is disabled.
* This disables the SPI controller, interrupts, clears the interrupts status,
* and re-enable the controller back. Transmit and receive FIFO buffers are
* cleared when the device is disabled.
*/
static inline void spi_reset_chip(struct dw_spi *dws)
{
spi_enable_chip(dws, 0);
spi_mask_intr(dws, 0xff);
dw_readl(dws, DW_SPI_ICR);
spi_enable_chip(dws, 1);
}