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authorGreg Kroah-Hartman <gregkh@suse.de>2012-01-26 11:14:42 -0800
committerGreg Kroah-Hartman <gregkh@suse.de>2012-01-26 11:14:42 -0800
commitaf681cad3f79ad8f7bd6cb170b70990aeef74233 (patch)
treee9f6240d7b94347cdb0c1cc321b9122c47caa71c /drivers
parent773598357c0baf03081cf87f2b444f97744faf1e (diff)
downloadlinux-linaro-stable-af681cad3f79ad8f7bd6cb170b70990aeef74233.tar.gz
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 <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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/tty/serial/omap-serial.c51
1 files changed, 1 insertions, 50 deletions
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index e00ac05cfdb4..ca54f038ab45 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