i2c: davinci: Avoid zero value of CLKH
[ Upstream commit cc8de9a68599b261244ea453b38678229f06ada7 ] 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: Alexander Sverdlin <alexander.sverdlin@nokia.com> Acked-by: Sekhar Nori <nsekhar@ti.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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1 changed files with 6 additions and 2 deletions
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@ -234,12 +234,16 @@ static void i2c_davinci_calc_clk_dividers(struct davinci_i2c_dev *dev)
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/*
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* It's not always possible to have 1 to 2 ratio when d=7, so fall back
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* to minimal possible clkh in this case.
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*
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* Note:
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* CLKH is not allowed to be 0, in this case I2C clock is not generated
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* at all
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*/
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if (clk >= clkl + d) {
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if (clk > clkl + d) {
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clkh = clk - clkl - d;
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clkl -= d;
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} else {
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clkh = 0;
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clkh = 1;
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clkl = clk - (d << 1);
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}
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