@@ -1072,6 +1072,8 @@ static int max77693_muic_probe(struct platform_device *pdev)
struct max77693_reg_data *init_data;
int num_init_data;
int delay_jiffies;
+ int cable_type;
+ bool attached;
int ret;
int i;
unsigned int id;
@@ -1212,8 +1214,18 @@ static int max77693_muic_probe(struct platform_device *pdev)
delay_jiffies = msecs_to_jiffies(DELAY_MS_DEFAULT);
}
- /* Set initial path for UART */
- max77693_muic_set_path(info, info->path_uart, true);
+ /* Set initial path for UART when JIG is connected to get serial logs */
+ ret = regmap_bulk_read(info->max77693->regmap_muic,
+ MAX77693_MUIC_REG_STATUS1, info->status, 2);
+ if (ret) {
+ dev_err(info->dev, "failed to read MUIC register\n");
+ return ret;
+ }
+ cable_type = max77693_muic_get_cable_type(info,
+ MAX77693_CABLE_GROUP_ADC, &attached);
+ if (attached && (cable_type == MAX77693_MUIC_ADC_FACTORY_MODE_UART_ON ||
+ cable_type == MAX77693_MUIC_ADC_FACTORY_MODE_UART_OFF))
+ max77693_muic_set_path(info, info->path_uart, true);
/* Check revision number of MUIC device*/
ret = regmap_read(info->max77693->regmap_muic,
Driver unconditionally forces UART path during probe, probably to ensure that one can get kernel serial log as soon as possible. This approach causes some issues, especially when board is booted with non-UART cable connected to micro-USB port. For example, when USB cable is connected, UART TX/RX lines are unconditionally short-circuited to USB D+/D- lines. This is in turn recognized by a series of serial BREAK signals and some random characters when USB host tries to perform enumeration procedure. To solve the above issue and keep UART console operational as early as possible, set UART path only when USB ID reports UART capable cable. Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com> --- drivers/extcon/extcon-max77693.c | 16 ++++++++++++++-- 1 file changed, 14 insertions(+), 2 deletions(-) -- 2.17.1