Currently we are using uart prepare and resume calls to gate uart clocks retaining the same method.
More details on reason to retain this design is provided here: http://www.spinics.net/lists/linux-serial/msg04128.html Since prepare and resume hooks are moved to driver itself we can just use a single prepare and resume call. As in driver we traverse on number of uart instance and handle it accordingly. In 34xx uart can wakeup using module level PM_WKEN or IO PAD wakeup use resume_call from prcm irq handler to wakeup uart, based on chk_wakeup_status from io_pad or PM_WKST. Signed-off-by: Govindraj.R <govindraj.r...@ti.com> --- arch/arm/mach-omap2/pm24xx.c | 8 +---- arch/arm/mach-omap2/pm34xx.c | 17 +++++------- arch/arm/plat-omap/include/plat/serial.h | 4 +- drivers/tty/serial/omap-serial.c | 40 ++++++++++++++++++++++++++++++ 4 files changed, 51 insertions(+), 18 deletions(-) diff --git a/arch/arm/mach-omap2/pm24xx.c b/arch/arm/mach-omap2/pm24xx.c index 39f26af..91eacef 100644 --- a/arch/arm/mach-omap2/pm24xx.c +++ b/arch/arm/mach-omap2/pm24xx.c @@ -138,18 +138,14 @@ static void omap2_enter_full_retention(void) if (!console_trylock()) goto no_sleep; - omap_uart_prepare_idle(0); - omap_uart_prepare_idle(1); - omap_uart_prepare_idle(2); + omap_uart_prepare_idle(); /* Jump to SRAM suspend code */ omap2_sram_suspend(sdrc_read_reg(SDRC_DLLA_CTRL), OMAP_SDRC_REGADDR(SDRC_DLLA_CTRL), OMAP_SDRC_REGADDR(SDRC_POWER)); - omap_uart_resume_idle(2); - omap_uart_resume_idle(1); - omap_uart_resume_idle(0); + omap_uart_resume_idle(); if (!is_suspending()) console_unlock(); diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c index 9f3bf2c..26ddd56 100644 --- a/arch/arm/mach-omap2/pm34xx.c +++ b/arch/arm/mach-omap2/pm34xx.c @@ -210,6 +210,7 @@ static int prcm_clear_mod_irqs(s16 module, u8 regs) wkst = omap2_prm_read_mod_reg(module, wkst_off); wkst &= omap2_prm_read_mod_reg(module, grpsel_off); + c += omap_uart_resume_idle(); if (wkst) { iclk = omap2_cm_read_mod_reg(module, iclk_off); fclk = omap2_cm_read_mod_reg(module, fclk_off); @@ -380,17 +381,19 @@ void omap_sram_idle(void) } /* Block console output in case it is on one of the OMAP UARTs */ - if (!is_suspending()) + if (!is_suspending()) { if (per_next_state < PWRDM_POWER_ON || - core_next_state < PWRDM_POWER_ON) + core_next_state < PWRDM_POWER_ON) { if (!console_trylock()) goto console_still_active; + else + omap_uart_prepare_idle(); + } + } /* PER */ if (per_next_state < PWRDM_POWER_ON) { per_going_off = (per_next_state == PWRDM_POWER_OFF) ? 1 : 0; - omap_uart_prepare_idle(2); - omap_uart_prepare_idle(3); omap2_gpio_prepare_for_idle(per_going_off); if (per_next_state == PWRDM_POWER_OFF) omap3_per_save_context(); @@ -398,8 +401,6 @@ void omap_sram_idle(void) /* CORE */ if (core_next_state < PWRDM_POWER_ON) { - omap_uart_prepare_idle(0); - omap_uart_prepare_idle(1); if (core_next_state == PWRDM_POWER_OFF) { omap3_core_save_context(); omap3_cm_save_context(); @@ -446,8 +447,6 @@ void omap_sram_idle(void) omap3_sram_restore_context(); omap2_sms_restore_context(); } - omap_uart_resume_idle(0); - omap_uart_resume_idle(1); if (core_next_state == PWRDM_POWER_OFF) omap2_prm_clear_mod_reg_bits(OMAP3430_AUTO_OFF_MASK, OMAP3430_GR_MOD, @@ -461,8 +460,6 @@ void omap_sram_idle(void) omap2_gpio_resume_after_idle(); if (per_prev_state == PWRDM_POWER_OFF) omap3_per_restore_context(); - omap_uart_resume_idle(2); - omap_uart_resume_idle(3); } if (!is_suspending()) diff --git a/arch/arm/plat-omap/include/plat/serial.h b/arch/arm/plat-omap/include/plat/serial.h index bfd73b7..5b8c8f2 100644 --- a/arch/arm/plat-omap/include/plat/serial.h +++ b/arch/arm/plat-omap/include/plat/serial.h @@ -109,8 +109,8 @@ struct omap_board_data; extern void omap_serial_init(void); extern void omap_serial_init_port(struct omap_board_data *bdata); -extern void omap_uart_prepare_idle(int num); -extern void omap_uart_resume_idle(int num); +extern void omap_uart_prepare_idle(void); +extern int omap_uart_resume_idle(void); #endif #endif diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c index 96fc860..05c2f52 100644 --- a/drivers/tty/serial/omap-serial.c +++ b/drivers/tty/serial/omap-serial.c @@ -54,6 +54,46 @@ static void serial_omap_rx_timeout(unsigned long uart_no); static int serial_omap_start_rxdma(struct uart_omap_port *up); static void omap_uart_mdr1_errataset(struct uart_omap_port *up, u8 mdr1); +int omap_uart_resume_idle() +{ + struct uart_omap_port *up; + int i, ret = 0; + + for (i = 0; i < OMAP_MAX_HSUART_PORTS; i++) { + up = ui[i]; + if (!up) + continue; + + if (!up->clocked && up->chk_wakeup(up->pdev)) { + pm_runtime_get_sync(&up->pdev->dev); + up->clocked = 1; + ret++; + } + } + + return ret; +} + +void omap_uart_prepare_idle() +{ + struct uart_omap_port *up; + int i; + + for (i = 0; i < OMAP_MAX_HSUART_PORTS; i++) { + up = ui[i]; + if (!up) + continue; + + if (up->clocked && + jiffies_to_msecs(jiffies - up->port_activity) + > 3000) { + pm_runtime_mark_last_busy(&up->pdev->dev); + pm_runtime_put_autosuspend(&up->pdev->dev); + up->clocked = 0; + } + } +} + static inline unsigned int serial_in(struct uart_omap_port *up, int offset) { offset <<= up->port.regshift; -- 1.7.4.1 -- 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
