i2c: algo: pca: Fix mode selection for PCA9665
authorThomas Kavanagh <tkavanagh@juniper.net>
Thu, 13 Sep 2012 15:16:55 +0000 (08:16 -0700)
committerWolfram Sang <w.sang@pengutronix.de>
Fri, 14 Sep 2012 13:25:22 +0000 (15:25 +0200)
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>
drivers/i2c/algos/i2c-algo-pca.c

index 73133b1063f012416d2a957f3fc2432ace395439..6f5f98d69af7c26b2fd7b895106e11745ce7d155 100644 (file)
@@ -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;