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Commit 84bf2c86 authored by Aaro Koskinen's avatar Aaro Koskinen Committed by Ben Dooks
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i2c: OMAP3: Better noise suppression for fast/standard modes 



Use longer noise filter period for fast and standard mode. Based on an
earlier patch by Eero Nurkkala.

Signed-off-by: default avatarAaro Koskinen <aaro.koskinen@nokia.com>
Acked-by: default avatarTony Lindgren <tony@atomide.com>
Signed-off-by: default avatarBen Dooks <ben-linux@fluff.org>
parent baf46b4e

drivers/i2c/busses/i2c-omap.c

+12 −2
Original line number Diff line number Diff line
@@ -333,8 +333,18 @@ static int omap_i2c_init(struct omap_i2c_dev *dev) 


	if (cpu_is_omap2430() || cpu_is_omap34xx()) {



		/* HSI2C controller internal clk rate should be 19.2 Mhz */

		/*

		 * HSI2C controller internal clk rate should be 19.2 Mhz for

		 * HS and for all modes on 2430. On 34xx we can use lower rate

		 * to get longer filter period for better noise suppression.

		 * The filter is iclk (fclk for HS) period.

		 */

		if (dev->speed > 400 || cpu_is_omap_2430())

			internal_clk = 19200;

		else if (dev->speed > 100)

			internal_clk = 9600;

		else

			internal_clk = 4000;

		fclk_rate = clk_get_rate(dev->fclk) / 1000;



		/* Compute prescaler divisor */