Hi, I'm having trouble getting the UART wakeup from sleep via activity on the RX pin working.
-------------------------------------------------------- Assumptions (using UART3) 1. Using Arago Linux 2.6.32 2. OMAP3730 is in sleep mode via echo 1 > /mnt/dbg/pm_debug/sleep_while_idle 3. The UARTi.SCR_REG[4] RX_CTS_WU_EN bit is set to 1. 4. The UARTi.IER_REG[4] SLEEP_MODE bit to 1 5. The UARTi.SYSC_REG[2] ENAWAKEUP bit is set to 1 6. The UARTi.WER_REG EVENT_4_RX_ACTIVITY bit is set to 1 7. The UARTi.SSR_REG RX_CTS_DSR_WAKE_UP_STS bit is set to 1 Expectations When a character arrives on the RX pin of UART3 when in sleep mode, the OMAP3730 exits sleep mode immediately via a RX_CTS_DSR_WAKE_UP interrupt. Problem The interrupt does happen but only after the UART clocks have been enabled. The OMAP3730 seems to exit sleep mode only when the UART clocks are re-enabled via omap_uart_enable_clocks() in arch/arm/mach-omap2/serial.c -------------------------------------------------------- Any help greatly appreciated. Rick -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
