diff options
Diffstat (limited to 'arch/arm/mach-omap2/serial.c')
| -rw-r--r-- | arch/arm/mach-omap2/serial.c | 51 |
1 files changed, 25 insertions, 26 deletions
diff --git a/arch/arm/mach-omap2/serial.c b/arch/arm/mach-omap2/serial.c index 8e0d0062cb15..85516c946ef0 100644 --- a/arch/arm/mach-omap2/serial.c +++ b/arch/arm/mach-omap2/serial.c @@ -63,6 +63,7 @@ struct omap_uart_state { static LIST_HEAD(uart_list); static u8 num_uarts; +static u8 console_uart_id = -1; #define DEFAULT_RXDMA_POLLRATE 1 /* RX DMA polling rate (us) */ #define DEFAULT_RXDMA_BUFSIZE 4096 /* RX DMA buffer size */ @@ -264,12 +265,20 @@ static void omap_serial_fill_default_pads(struct omap_board_data *bdata) static void omap_serial_fill_default_pads(struct omap_board_data *bdata) {} #endif +char *cmdline_find_option(char *str) +{ + extern char *saved_command_line; + + return strstr(saved_command_line, str); +} + static int __init omap_serial_early_init(void) { do { char oh_name[MAX_UART_HWMOD_NAME_LEN]; struct omap_hwmod *oh; struct omap_uart_state *uart; + char uart_name[MAX_UART_HWMOD_NAME_LEN]; snprintf(oh_name, MAX_UART_HWMOD_NAME_LEN, "uart%d", num_uarts + 1); @@ -284,18 +293,22 @@ static int __init omap_serial_early_init(void) uart->oh = oh; uart->num = num_uarts++; list_add_tail(&uart->node, &uart_list); - - /* - * NOTE: omap_hwmod_setup*() has not yet been called, - * so no hwmod functions will work yet. - */ - - /* - * During UART early init, device need to be probed - * to determine SoC specific init before omap_device - * is ready. Therefore, don't allow idle here - */ - uart->oh->flags |= HWMOD_INIT_NO_IDLE | HWMOD_INIT_NO_RESET; + snprintf(uart_name, MAX_UART_HWMOD_NAME_LEN, + "%s%d", OMAP_SERIAL_NAME, uart->num); + + if (cmdline_find_option(uart_name)) { + console_uart_id = uart->num; + /* + * omap-uart can be used for earlyprintk logs + * So if omap-uart is used as console then prevent + * uart reset and idle to get logs from omap-uart + * until uart console driver is available to take + * care for console messages. + * Idling or resetting omap-uart while printing logs + * early boot logs can stall the boot-up. + */ + oh->flags |= HWMOD_INIT_NO_IDLE | HWMOD_INIT_NO_RESET; + } } while (1); return 0; @@ -379,20 +392,6 @@ void __init omap_serial_init_port(struct omap_board_data *bdata, oh->dev_attr = uart; - console_lock(); /* in case the earlycon is on the UART */ - - /* - * Because of early UART probing, UART did not get idled - * on init. Now that omap_device is ready, ensure full idle - * before doing omap_device_enable(). - */ - omap_hwmod_idle(uart->oh); - - omap_device_enable(uart->pdev); - omap_device_idle(uart->pdev); - - console_unlock(); - if ((cpu_is_omap34xx() || cpu_is_omap44xx()) && bdata->pads) device_init_wakeup(&pdev->dev, true); } |