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spi: microchip-core-qspi: fix setting spi bus clock rate

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commit ef13561d2b163ac0ae6befa53bca58a26dc3320b upstream.

Before ORing the new clock rate with the control register value read
from the hardware, the existing clock rate needs to be masked off as
otherwise the existing value will interfere with the new one.

CC: stable@vger.kernel.org
Fixes: 8596124c4c1b ("spi: microchip-core-qspi: Add support for microchip fpga qspi controllers")
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Reviewed-by: Tudor Ambarus <tudor.ambarus@linaro.org>
Link: https://lore.kernel.org/r/20240508-fox-unpiloted-b97e1535627b@spud
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Conor Dooley 2024-05-08 16:46:51 +01:00 committed by Greg Kroah-Hartman
parent ebed91287c
commit 4ec0121716
1 changed files with 1 additions and 0 deletions
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drivers/spi/spi-microchip-core-qspi.c
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@ -283,6 +283,7 @@ static int mchp_coreqspi_setup_clock(struct mchp_coreqspi *qspi, struct spi_devi
}
control = readl_relaxed(qspi->regs + REG_CONTROL);
control &= ~CONTROL_CLKRATE_MASK;
control |= baud_rate_val << CONTROL_CLKRATE_SHIFT;
writel_relaxed(control, qspi->regs + REG_CONTROL);
control = readl_relaxed(qspi->regs + REG_CONTROL);