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ARM: OMAP2+: UART: Get context loss count to context restore 

Avoid unconditional context restore every time we gate uart
clocks. Check whether context loss happened based on which
we can context restore uart regs from uart_port structure.

Signed-off-by: Govindraj.R <govindraj.raja@ti.com>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de> (for drivers/tty changes)
Signed-off-by: Kevin Hilman <khilman@ti.com>
This commit is contained in:
Govindraj.R 2011-10-11 19:11:27 +05:30 committed by Kevin Hilman
parent 32212897ee
commit ec3bebc6ec
3 changed files with 23 additions and 2 deletions
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2
arch/arm/mach-omap2/serial.c
View File

@ -33,6 +33,7 @@
#include <plat/dma.h>
#include <plat/omap_hwmod.h>
#include <plat/omap_device.h>
#include <plat/omap-pm.h>
#include "prm2xxx_3xxx.h"
#include "pm.h"
@ -478,6 +479,7 @@ void __init omap_serial_init_port(struct omap_board_data *bdata)
omap_up.dma_enabled = uart->dma_enabled;
omap_up.uartclk = OMAP24XX_BASE_BAUD * 16;
omap_up.flags = UPF_BOOT_AUTOCONF;
omap_up.get_context_loss_count = omap_pm_get_dev_context_loss_count;
pdata = &omap_up;
pdata_size = sizeof(struct omap_uart_port_info);

3
arch/arm/plat-omap/include/plat/omap-serial.h
View File

@ -62,6 +62,8 @@ struct omap_uart_port_info {
bool dma_enabled; /* To specify DMA Mode */
unsigned int uartclk; /* UART clock rate */
upf_t flags; /* UPF_* flags */
int (*get_context_loss_count)(struct device *);
};
struct uart_omap_dma {
@ -114,6 +116,7 @@ struct uart_omap_port {
unsigned char msr_saved_flags;
char name[20];
unsigned long port_activity;
u32 context_loss_cnt;
};
#endif /* __OMAP_SERIAL_H__ */

20
drivers/tty/serial/omap-serial.c
View File

@ -1440,15 +1440,31 @@ static void serial_omap_restore_context(struct uart_omap_port *up)
#ifdef CONFIG_PM_RUNTIME
static int serial_omap_runtime_suspend(struct device *dev)
{
struct uart_omap_port *up = dev_get_drvdata(dev);
struct omap_uart_port_info *pdata = dev->platform_data;
if (!up)
return -EINVAL;
if (pdata->get_context_loss_count)
up->context_loss_cnt = pdata->get_context_loss_count(dev);
return 0;
}
static int serial_omap_runtime_resume(struct device *dev)
{
struct uart_omap_port *up = dev_get_drvdata(dev);
struct omap_uart_port_info *pdata = dev->platform_data;
if (up)
serial_omap_restore_context(up);
if (up) {
if (pdata->get_context_loss_count) {
u32 loss_cnt = pdata->get_context_loss_count(dev);
if (up->context_loss_cnt != loss_cnt)
serial_omap_restore_context(up);
}
}
return 0;
}