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Commit 5d1d150d authored by Doug Anderson's avatar Doug Anderson Committed by Mark Brown
Browse files

spi/rockchip: Avoid accidentally turning off the clock 



If our client is requesting a clock that is above the maximum clock
then the following division will result in 0:
  rs->max_freq / rs->speed

We'll then program 0 into the SPI_BAUDR register.  The Rockchip TRM
says: "If the value is 0, the serial output clock (sclk_out) is
disabled."

It's much better to end up with the fastest possible clock rather than
a clock that is off, so enforce a minimum value.

Signed-off-by: default avatarDoug Anderson <dianders@chromium.org>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 0ac7a490

drivers/spi/spi-rockchip.c

+1 −1
Original line number Diff line number Diff line
@@ -499,7 +499,7 @@ static void rockchip_spi_config(struct rockchip_spi *rs) 
	}



	/* div doesn't support odd number */

	div = rs->max_freq / rs->speed;

	div = max_t(u32, rs->max_freq / rs->speed, 1);

	div = (div + 1) & 0xfffe;



	spi_enable_chip(rs, 0);