diff options
| -rw-r--r-- | driver/gl3590.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/driver/gl3590.c b/driver/gl3590.c index 2a73f44aad..cb8d914d8c 100644 --- a/driver/gl3590.c +++ b/driver/gl3590.c @@ -4,6 +4,7 @@ */ #include "console.h" +#include "hooks.h" #include "i2c.h" #include "system.h" #include "util.h" @@ -11,6 +12,7 @@ #include "gl3590.h" +#define CPRINTS(format, args...) cprints(CC_SYSTEM, format, ## args) #define CPRINTF(format, args...) cprintf(CC_I2C, format, ## args) /* GL3590 is unique in terms of i2c_read, since it doesn't support repeated @@ -118,6 +120,19 @@ void gl3590_init(int hub) uhub_p->initialized = 1; } +/* + * GL3590 chip may drive I2C_SDA and I2C_SCL lines for 200ms (max) after it is + * released from reset (through gpio de-assertion in main()). In order to avoid + * broken I2C transactions, we need to add an extra delay before any activity on + * the I2C bus in the system. + */ +static void gl3590_delay_on_init(void) +{ + CPRINTS("Applying 200ms delay for GL3590 to release I2C lines"); + udelay(200 * MSEC); +} +DECLARE_HOOK(HOOK_INIT, gl3590_delay_on_init, HOOK_PRIO_INIT_I2C - 1); + void gl3590_irq_handler(int hub) { uint8_t buf = 0; |