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it83xx: i2c: increase clock low timeout to maximum

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This timeout is described in SMBus specification (25ms).
Some I2C devices may required longer clock stretch
(The I2C specification does not specify any timeout conditions
for clock stretching).
So we increase this timeout to maximum.

NOTE:
Because this codebase already handle timeout of an I2C transfer,
so maybe we can disable this mechanism.
But we don't have any register to execute this,
so we maximize the timeout.

BRANCH=none
BUG=none
TEST=console commands: i2cscan, battery, charger, and accelinfo.

Change-Id: I5025f640c027105152247212fc688388f645c5ba
Signed-off-by: Dino Li <Dino.Li@ite.com.tw>
Reviewed-on: https://chromium-review.googlesource.com/485203
Reviewed-by: Randall Spangler <rspangler@chromium.org>
This commit is contained in:
Dino Li
2017-04-24 17:30:27 +08:00
committed by chrome-bot
parent 5b4decd26a
commit b377e7bac0
1 changed files with 1 additions and 1 deletions
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2
chip/it83xx/i2c.c
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@@ -22,7 +22,7 @@
* The count number of the counter for 25 ms register.
* The 25 ms register is calculated by (count number *1.024 kHz).
*/
#define I2C_CLK_LOW_TIMEOUT 25 /* ~= 25ms */
#define I2C_CLK_LOW_TIMEOUT 255 /* ~=249 ms */
/* Default maximum time we allow for an I2C transfer */
#define I2C_TIMEOUT_DEFAULT_US (100 * MSEC)