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| author |   Alexander Sverdlin <alexander.sverdlin@nokia.com> | 2018-07-13 17:20:17 +0200 |
|---|---|---|
| committer |   Wolfram Sang <wsa@the-dreams.de> | 2018-07-23 20:04:35 +0200 |
| commit | cc8de9a68599b261244ea453b38678229f06ada7 (patch) | |
| tree | 6a044d0fa318471d034ee0fc011fa1b745290c53 | |
| parent | Linux 4.18-rc6 (diff) | |
| download | linux-dev-cc8de9a68599b261244ea453b38678229f06ada7.tar.xz linux-dev-cc8de9a68599b261244ea453b38678229f06ada7.zip | |
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: Alexander Sverdlin <alexander.sverdlin@nokia.com>
Acked-by: Sekhar Nori <nsekhar@ti.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| -rw-r--r-- | drivers/i2c/busses/i2c-davinci.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/i2c/busses/i2c-davinci.c b/drivers/i2c/busses/i2c-davinci.c index 75d6ab177055..7379043711df 100644 --- a/drivers/i2c/busses/i2c-davinci.c +++ b/drivers/i2c/busses/i2c-davinci.c @@ -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 * 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; clkl -= d; } else { - clkh = 0; + clkh = 1; clkl = clk - (d << 1); } |