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Revert "tty: serial: OMAP: transmit FIFO threshold interrupts don't wake the chip"

Browse source 
This reverts commit 43cf7c0beb as Paul
wants to redo it.

Cc: Paul Walmsley <paul@pwsan.com>
Cc: Tomi Valkeinen <tomi.valkeinen@ti.com>
Cc: Govindraj Raja <govindraj.r@ti.com>
Cc: Kevin Hilman <khilman@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Greg Kroah-Hartman 2012-01-26 11:14:42 -08:00
parent 773598357c
commit af681cad3f
2 changed files with 1 additions and 51 deletions
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1
arch/arm/plat-omap/include/plat/omap-serial.h
View file

@ -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;

51
drivers/tty/serial/omap-serial.c
View file

@ -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