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Merge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

Browse Source 
Pull i2c updates from Wolfram Sang:
 "Usual driver bugfixes for the I2C subsystem"

* 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  i2c: algo: pca: Reapply i2c bus settings after reset
  i2c: npcm7xx: Fix timeout calculation
  misc: eeprom: at24: register nvmem only after eeprom is ready to use
This commit is contained in:
Linus Torvalds 2020-09-11 13:43:05 -07:00
commit e9287bd248
4 changed files with 51 additions and 18 deletions
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35
drivers/i2c/algos/i2c-algo-pca.c
View File

@ -41,8 +41,22 @@ static void pca_reset(struct i2c_algo_pca_data *adap)
pca_outw(adap, I2C_PCA_INDPTR, I2C_PCA_IPRESET);
pca_outw(adap, I2C_PCA_IND, 0xA5);
pca_outw(adap, I2C_PCA_IND, 0x5A);
/*
* After a reset we need to re-apply any configuration
* (calculated in pca_init) to get the bus in a working state.
*/
pca_outw(adap, I2C_PCA_INDPTR, I2C_PCA_IMODE);
pca_outw(adap, I2C_PCA_IND, adap->bus_settings.mode);
pca_outw(adap, I2C_PCA_INDPTR, I2C_PCA_ISCLL);
pca_outw(adap, I2C_PCA_IND, adap->bus_settings.tlow);
pca_outw(adap, I2C_PCA_INDPTR, I2C_PCA_ISCLH);
pca_outw(adap, I2C_PCA_IND, adap->bus_settings.thi);
pca_set_con(adap, I2C_PCA_CON_ENSIO);
} else {
adap->reset_chip(adap->data);
pca_set_con(adap, I2C_PCA_CON_ENSIO | adap->bus_settings.clock_freq);
}
}
@ -423,13 +437,14 @@ static int pca_init(struct i2c_adapter *adap)
" Use the nominal frequency.\n", adap->name);
}
pca_reset(pca_data);
clock = pca_clock(pca_data);
printk(KERN_INFO "%s: Clock frequency is %dkHz\n",
adap->name, freqs[clock]);
pca_set_con(pca_data, I2C_PCA_CON_ENSIO | clock);
/* Store settings as these will be needed when the PCA chip is reset */
pca_data->bus_settings.clock_freq = clock;
pca_reset(pca_data);
} else {
int clock;
int mode;
@ -496,19 +511,15 @@ static int pca_init(struct i2c_adapter *adap)
thi = tlow * min_thi / min_tlow;
}
/* Store settings as these will be needed when the PCA chip is reset */
pca_data->bus_settings.mode = mode;
pca_data->bus_settings.tlow = tlow;
pca_data->bus_settings.thi = thi;
pca_reset(pca_data);
printk(KERN_INFO
"%s: Clock frequency is %dHz\n", adap->name, clock * 100);
pca_outw(pca_data, I2C_PCA_INDPTR, I2C_PCA_IMODE);
pca_outw(pca_data, I2C_PCA_IND, mode);
pca_outw(pca_data, I2C_PCA_INDPTR, I2C_PCA_ISCLL);
pca_outw(pca_data, I2C_PCA_IND, tlow);
pca_outw(pca_data, I2C_PCA_INDPTR, I2C_PCA_ISCLH);
pca_outw(pca_data, I2C_PCA_IND, thi);
pca_set_con(pca_data, I2C_PCA_CON_ENSIO);
}
udelay(500); /* 500 us for oscillator to stabilise */

8
drivers/i2c/busses/i2c-npcm7xx.c
View File

@ -2093,8 +2093,12 @@ static int npcm_i2c_master_xfer(struct i2c_adapter *adap, struct i2c_msg *msgs,
}
}
/* Adaptive TimeOut: astimated time in usec + 100% margin */
timeout_usec = (2 * 10000 / bus->bus_freq) * (2 + nread + nwrite);
/*
* Adaptive TimeOut: estimated time in usec + 100% margin:
* 2: double the timeout for clock stretching case
* 9: bits per transaction (including the ack/nack)
*/
timeout_usec = (2 * 9 * USEC_PER_SEC / bus->bus_freq) * (2 + nread + nwrite);
timeout = max(msecs_to_jiffies(35), usecs_to_jiffies(timeout_usec));
if (nwrite >= 32 * 1024 || nread >= 32 * 1024) {
dev_err(bus->dev, "i2c%d buffer too big\n", bus->num);

11
drivers/misc/eeprom/at24.c
View File

@ -692,10 +692,6 @@ static int at24_probe(struct i2c_client *client)
nvmem_config.word_size = 1;
nvmem_config.size = byte_len;
at24->nvmem = devm_nvmem_register(dev, &nvmem_config);
if (IS_ERR(at24->nvmem))
return PTR_ERR(at24->nvmem);
i2c_set_clientdata(client, at24);
err = regulator_enable(at24->vcc_reg);
@ -708,6 +704,13 @@ static int at24_probe(struct i2c_client *client)
pm_runtime_set_active(dev);
pm_runtime_enable(dev);
at24->nvmem = devm_nvmem_register(dev, &nvmem_config);
if (IS_ERR(at24->nvmem)) {
pm_runtime_disable(dev);
regulator_disable(at24->vcc_reg);
return PTR_ERR(at24->nvmem);
}
/*
* Perform a one-byte test read to verify that the
* chip is functional.

15
include/linux/i2c-algo-pca.h
View File

@ -53,6 +53,20 @@
#define I2C_PCA_CON_SI 0x08 /* Serial Interrupt */
#define I2C_PCA_CON_CR 0x07 /* Clock Rate (MASK) */
/**
* struct pca_i2c_bus_settings - The configured PCA i2c bus settings
* @mode: Configured i2c bus mode
* @tlow: Configured SCL LOW period
* @thi: Configured SCL HIGH period
* @clock_freq: The configured clock frequency
*/
struct pca_i2c_bus_settings {
int mode;
int tlow;
int thi;
int clock_freq;
};
struct i2c_algo_pca_data {
void *data; /* private low level data */
void (*write_byte) (void *data, int reg, int val);
@ -64,6 +78,7 @@ struct i2c_algo_pca_data {
* For PCA9665, use the frequency you want here. */
unsigned int i2c_clock;
unsigned int chip;
struct pca_i2c_bus_settings bus_settings;
};
int i2c_pca_add_bus(struct i2c_adapter *);