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Revert "power: supply: sbs-battery: simplify read_read_string_data"

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The commit is a nice cleanup, but breaks booting on exynos5 based
chromebooks. It's seems to come down to exynos5's i2c driver not
implementing I2C_FUNC_SMBUS_READ_BLOCK_DATA. It's not yet clear
why that breaks boot / massively slows it down when userspace
starts, so revert the problematic patch.

This reverts commit c4b12a2f3f.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
This commit is contained in:
Sebastian Reichel 2020-06-02 16:49:08 +02:00
parent cf1eb321d1
commit 972eabb97a
1 changed files with 54 additions and 13 deletions
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67
drivers/power/supply/sbs-battery.c
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@ -267,32 +267,66 @@ static int sbs_read_string_data(struct i2c_client *client, u8 address,
char *values)
{
struct sbs_info *chip = i2c_get_clientdata(client);
int retries = chip->i2c_retry_count;
s32 ret = 0;
s32 ret = 0, block_length = 0;
int retries_length, retries_block;
u8 block_buffer[I2C_SMBUS_BLOCK_MAX + 1];
retries_length = chip->i2c_retry_count;
retries_block = chip->i2c_retry_count;
/* Adapter needs to support these two functions */
if (!i2c_check_functionality(client->adapter,
I2C_FUNC_SMBUS_READ_BLOCK_DATA)) {
I2C_FUNC_SMBUS_BYTE_DATA |
I2C_FUNC_SMBUS_I2C_BLOCK)){
return -ENODEV;
}
/* Get the block data */
while (retries > 0) {
ret = i2c_smbus_read_block_data(client, address, values);
/* Get the length of block data */
while (retries_length > 0) {
ret = i2c_smbus_read_byte_data(client, address);
if (ret >= 0)
break;
retries--;
retries_length--;
}
if (ret < 0) {
dev_dbg(&client->dev, "%s: failed to read block 0x%x: %d\n",
__func__, address, ret);
dev_dbg(&client->dev,
"%s: i2c read at address 0x%x failed\n",
__func__, address);
return ret;
}
/* add string termination */
values[ret] = '\0';
/* block_length does not include NULL terminator */
block_length = ret;
if (block_length > I2C_SMBUS_BLOCK_MAX) {
dev_err(&client->dev,
"%s: Returned block_length is longer than 0x%x\n",
__func__, I2C_SMBUS_BLOCK_MAX);
return -EINVAL;
}
return 0;
/* Get the block data */
while (retries_block > 0) {
ret = i2c_smbus_read_i2c_block_data(
client, address,
block_length + 1, block_buffer);
if (ret >= 0)
break;
retries_block--;
}
if (ret < 0) {
dev_dbg(&client->dev,
"%s: i2c read at address 0x%x failed\n",
__func__, address);
return ret;
}
/* block_buffer[0] == block_length */
memcpy(values, block_buffer + 1, block_length);
values[block_length] = '\0';
return ret;
}
static int sbs_write_word_data(struct i2c_client *client, u8 address,
@ -514,7 +548,14 @@ static int sbs_get_battery_property(struct i2c_client *client,
static int sbs_get_battery_string_property(struct i2c_client *client,
int reg_offset, enum power_supply_property psp, char *val)
{
return sbs_read_string_data(client, sbs_data[reg_offset].addr, val);
s32 ret;
ret = sbs_read_string_data(client, sbs_data[reg_offset].addr, val);
if (ret < 0)
return ret;
return 0;
}
static void sbs_unit_adjustment(struct i2c_client *client,