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Commit cc8de9a6 authored by Alexander Sverdlin's avatar Alexander Sverdlin Committed by Wolfram Sang
Browse files

i2c: davinci: Avoid zero value of CLKH 



If CLKH is set to 0 I2C clock is not generated at all, so avoid this value
and stretch the clock in this case.

Signed-off-by: default avatarAlexander Sverdlin <alexander.sverdlin@nokia.com>
Acked-by: default avatarSekhar Nori <nsekhar@ti.com>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent d72e90f3

drivers/i2c/busses/i2c-davinci.c

+6 −2
Original line number Original line Diff line number Diff line
@@ -237,12 +237,16 @@ static void i2c_davinci_calc_clk_dividers(struct davinci_i2c_dev *dev) 
	/*

	/*

	 * It's not always possible to have 1 to 2 ratio when d=7, so fall back

	 * It's not always possible to have 1 to 2 ratio when d=7, so fall back

	 * to minimal possible clkh in this case.

	 * to minimal possible clkh in this case.

	 *

	 * Note:

	 * CLKH is not allowed to be 0, in this case I2C clock is not generated

	 * at all

	 */

	 */

	if (clk >= clkl + d) {

	if (clk > clkl + d) {

		clkh = clk - clkl - d;

		clkh = clk - clkl - d;

		clkl -= d;

		clkl -= d;

	} else {

	} else {

		clkh = 0;

		clkh = 1;

		clkl = clk - (d << 1);

		clkl = clk - (d << 1);

	}

	}