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serial: mrst_max3110: Make the IRQ option runtime 

And while we are at it allow it to fail to find one. Without this the IRQ
option will cause the 3110 driver to fail on 0.7 SFI firmware.

Acked-by: Feng Tang <feng.tang@intel.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Cox 2010-09-13 15:39:56 +08:00 committed by Greg Kroah-Hartman
parent ee9b4500eb
commit 91efa75ce1
2 changed files with 29 additions and 35 deletions
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7
drivers/serial/Kconfig
View File

@ -717,13 +717,6 @@ config SERIAL_MRST_MAX3110
the Intel Moorestown platform. On other systems use the max3100
driver.
config MRST_MAX3110_IRQ
boolean "Enable GPIO IRQ for Max3110 over Moorestown"
default n
depends on SERIAL_MRST_MAX3110 && GPIO_LANGWELL
help
This has to be enabled after Moorestown GPIO driver is loaded
config SERIAL_MFD_HSU
tristate "Medfield High Speed UART support"
depends on PCI

31
drivers/serial/mrst_max3110.c
View File

@ -447,7 +447,6 @@ static int max3110_main_thread(void *_max)
return ret;
}
#ifdef CONFIG_MRST_MAX3110_IRQ
static irqreturn_t serial_m3110_irq(int irq, void *dev_id)
{
struct uart_max3110 *max = dev_id;
@ -459,7 +458,7 @@ static irqreturn_t serial_m3110_irq(int irq, void *dev_id)
return IRQ_HANDLED;
}
#else
/* if don't use RX IRQ, then need a thread to polling read */
static int max3110_read_thread(void *_max)
{
@ -482,7 +481,6 @@ static int max3110_read_thread(void *_max)
return 0;
}
#endif
static int serial_m3110_startup(struct uart_port *port)
{
@ -505,34 +503,38 @@ static int serial_m3110_startup(struct uart_port *port)
/* as we use thread to handle tx/rx, need set low latency */
port->state->port.tty->low_latency = 1;
#ifdef CONFIG_MRST_MAX3110_IRQ
if (max->irq) {
max->read_thread = NULL;
ret = request_irq(max->irq, serial_m3110_irq,
IRQ_TYPE_EDGE_FALLING, "max3110", max);
if (ret)
return ret;
if (ret) {
max->irq = 0;
pr_err(PR_FMT "unable to allocate IRQ, polling\n");
} else {
/* Enable RX IRQ only */
config |= WC_RXA_IRQ_ENABLE;
#else
}
}
if (max->irq == 0) {
/* If IRQ is disabled, start a read thread for input data */
max->read_thread =
kthread_run(max3110_read_thread, max, "max3110_read");
if (IS_ERR(max->read_thread)) {
ret = PTR_ERR(max->read_thread);
max->read_thread = NULL;
pr_err(PR_FMT "Can't create read thread!");
pr_err(PR_FMT "Can't create read thread!\n");
return ret;
}
#endif
}
ret = max3110_out(max, config);
if (ret) {
#ifdef CONFIG_MRST_MAX3110_IRQ
if (max->irq)
free_irq(max->irq, max);
#else
if (max->read_thread)
kthread_stop(max->read_thread);
max->read_thread = NULL;
#endif
return ret;
}
@ -551,9 +553,8 @@ static void serial_m3110_shutdown(struct uart_port *port)
max->read_thread = NULL;
}
#ifdef CONFIG_MRST_MAX3110_IRQ
if (max->irq)
free_irq(max->irq, max);
#endif
/* Disable interrupts from this port */
config = WC_TAG | WC_SW_SHDI;