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i2c: algo: pca: Fix mode selection for PCA9665

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The code currently always selects turbo mode for PCA9665, no matter which
clock frequency is configured. This is because it compares the clock frequency
against constants reflecting (boundary / 100). Compare against real boundary
frequencies to fix the problem.

Signed-off-by: Thomas Kavanagh <tkavanagh@juniper.net>
Signed-off-by: Guenter Roeck <groeck@juniper.net>
Signed-off-by: Wolfram Sang <w.sang@pengutronix.de>
This commit is contained in:
Thomas Kavanagh 2012-09-13 08:16:55 -07:00 committed by Wolfram Sang
parent 4a5b2b269e
commit 5f71a3ef37
1 changed files with 3 additions and 3 deletions
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6
drivers/i2c/algos/i2c-algo-pca.c
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@ -476,17 +476,17 @@ static int pca_init(struct i2c_adapter *adap)
/* To avoid integer overflow, use clock/100 for calculations */
clock = pca_clock(pca_data) / 100;
if (pca_data->i2c_clock > 10000) {
if (pca_data->i2c_clock > 1000000) {
mode = I2C_PCA_MODE_TURBO;
min_tlow = 14;
min_thi = 5;
raise_fall_time = 22; /* Raise 11e-8s, Fall 11e-8s */
} else if (pca_data->i2c_clock > 4000) {
} else if (pca_data->i2c_clock > 400000) {
mode = I2C_PCA_MODE_FASTP;
min_tlow = 17;
min_thi = 9;
raise_fall_time = 22; /* Raise 11e-8s, Fall 11e-8s */
} else if (pca_data->i2c_clock > 1000) {
} else if (pca_data->i2c_clock > 100000) {
mode = I2C_PCA_MODE_FAST;
min_tlow = 44;
min_thi = 20;