From af681cad3f79ad8f7bd6cb170b70990aeef74233 Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Thu, 26 Jan 2012 11:14:42 -0800 Subject: [PATCH] Revert "tty: serial: OMAP: transmit FIFO threshold interrupts don't wake the chip" This reverts commit 43cf7c0bebf50d0b68aa42ae6d24cf08e3f24823 as Paul wants to redo it. Cc: Paul Walmsley Cc: Tomi Valkeinen Cc: Govindraj Raja Cc: Kevin Hilman Signed-off-by: Greg Kroah-Hartman --- arch/arm/plat-omap/include/plat/omap-serial.h | 1 - drivers/tty/serial/omap-serial.c | 51 +-------------------------- 2 files changed, 1 insertion(+), 51 deletions(-) diff --git a/arch/arm/plat-omap/include/plat/omap-serial.h b/arch/arm/plat-omap/include/plat/omap-serial.h index 12a64eb..9ff4444 100644 --- a/arch/arm/plat-omap/include/plat/omap-serial.h +++ b/arch/arm/plat-omap/include/plat/omap-serial.h @@ -131,7 +131,6 @@ struct uart_omap_port { u32 context_loss_cnt; u32 errata; u8 wakeups_enabled; - u8 max_tx_count; struct pm_qos_request pm_qos_request; u32 latency; diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c index e00ac05..ca54f03 100644 --- a/drivers/tty/serial/omap-serial.c +++ b/drivers/tty/serial/omap-serial.c @@ -88,49 +88,6 @@ static inline void serial_omap_clear_fifos(struct uart_omap_port *up) serial_out(up, UART_FCR, 0); } -/** - * serial_omap_block_cpu_low_power_state - prevent MPU pwrdm from leaving ON - * @up: struct uart_omap_port * - * - * Prevent the MPU powerdomain from entering a power state lower than - * ON. (It should be sufficient to prevent it from entering INACTIVE, - * but there is presently no easy way to do this.) This works around - * a suspected silicon bug in the OMAP UART IP blocks. The UARTs should - * wake the PRCM when the transmit FIFO threshold interrupt is raised, but - * they do not. See also serial_omap_allow_cpu_low_power_state(). No - * return value. - */ -static void serial_omap_block_cpu_low_power_state(struct uart_omap_port *up) -{ -#ifdef CONFIG_CPU_IDLE - up->latency = 1; - schedule_work(&up->qos_work); -#else - up->max_tx_count = 1; -#endif -} - -/** - * serial_omap_allow_cpu_low_power_state - remove power state restriction on MPU - * @up: struct uart_omap_port * - * - * Cancel the effects of serial_omap_block_cpu_low_power_state(). - * This should allow the MPU powerdomain to enter a power state lower - * than ON, assuming the rest of the kernel is not restricting it. - * This works around a suspected silicon bug in the OMAP UART IP - * blocks. The UARTs should wake the PRCM when the transmit FIFO - * threshold interrupt is raised, but they do not. No return value. - */ -static void serial_omap_allow_cpu_low_power_state(struct uart_omap_port *up) -{ -#ifdef CONFIG_CPU_IDLE - up->latency = up->calc_latency; - schedule_work(&up->qos_work); -#else - up->max_tx_count = up->port.fifosize / 4; -#endif -} - /* * serial_omap_get_divisor - calculate divisor value * @port: uart port info @@ -206,9 +163,6 @@ static void serial_omap_stop_tx(struct uart_port *port) serial_out(up, UART_IER, up->ier); } - if (!up->use_dma) - serial_omap_allow_cpu_low_power_state(up); - pm_runtime_mark_last_busy(&up->pdev->dev); pm_runtime_put_autosuspend(&up->pdev->dev); } @@ -310,7 +264,7 @@ static void transmit_chars(struct uart_omap_port *up) serial_omap_stop_tx(&up->port); return; } - count = up->max_tx_count; + count = up->port.fifosize / 4; do { serial_out(up, UART_TX, xmit->buf[xmit->tail]); xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1); @@ -343,7 +297,6 @@ static void serial_omap_start_tx(struct uart_port *port) if (!up->use_dma) { pm_runtime_get_sync(&up->pdev->dev); - serial_omap_block_cpu_low_power_state(up); serial_omap_enable_ier_thri(up); pm_runtime_mark_last_busy(&up->pdev->dev); pm_runtime_put_autosuspend(&up->pdev->dev); @@ -1468,8 +1421,6 @@ static int serial_omap_probe(struct platform_device *pdev) up->port.fifosize = 64; up->port.ops = &serial_omap_pops; - up->max_tx_count = up->port.fifosize / 4; - if (pdev->dev.of_node) up->port.line = of_alias_get_id(pdev->dev.of_node, "serial"); else -- 2.7.4