diff options
Diffstat (limited to 'drivers/i2c/busses/i2c-img-scb.c')
| -rw-r--r-- | drivers/i2c/busses/i2c-img-scb.c | 30 |
1 files changed, 17 insertions, 13 deletions
diff --git a/drivers/i2c/busses/i2c-img-scb.c b/drivers/i2c/busses/i2c-img-scb.c index b4f59e1a5cac..e4daebcdf824 100644 --- a/drivers/i2c/busses/i2c-img-scb.c +++ b/drivers/i2c/busses/i2c-img-scb.c @@ -1178,25 +1178,29 @@ static int img_i2c_init(struct img_i2c *i2c) ((bitrate_khz * clk_period) / 2)) int_bitrate++; - /* Setup TCKH value */ - tckh = DIV_ROUND_UP(timing.tckh, clk_period); + /* + * Setup clock duty cycle, start with 50% and adjust TCKH and TCKL + * values from there if they don't meet minimum timing requirements + */ + tckh = int_bitrate / 2; + tckl = int_bitrate - tckh; - if (tckh > 0) - data = tckh - 1; - else - data = 0; + /* Adjust TCKH and TCKL values */ + data = DIV_ROUND_UP(timing.tckl, clk_period); - img_i2c_writel(i2c, SCB_TIME_TCKH_REG, data); + if (tckl < data) { + tckl = data; + tckh = int_bitrate - tckl; + } - /* Setup TCKL value */ - tckl = int_bitrate - tckh; + if (tckh > 0) + --tckh; if (tckl > 0) - data = tckl - 1; - else - data = 0; + --tckl; - img_i2c_writel(i2c, SCB_TIME_TCKL_REG, data); + img_i2c_writel(i2c, SCB_TIME_TCKH_REG, tckh); + img_i2c_writel(i2c, SCB_TIME_TCKL_REG, tckl); /* Setup TSDH value */ tsdh = DIV_ROUND_UP(timing.tsdh, clk_period); |