mtd: gpmi: initialize the timing registers only one time

The current code initializes the timing registers at very time
we call the gpmi_begin(). This really wastes the cpu cycles.

Add a new flag to let the gpmi driver initializes the timing registers
only one time.

Signed-off-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Huang Shijie 2012-09-13 14:58:00 +08:00 коммит произвёл David Woodhouse
Родитель 995fbbf563
Коммит 9c95f11b9e
2 изменённых файлов: 9 добавлений и 0 удалений

Просмотреть файл

@ -914,6 +914,9 @@ static int enable_edo_mode(struct gpmi_nand_data *this, int mode)
rate = (mode == 5) ? 100000000 : 80000000;
clk_set_rate(r->clock[0], rate);
/* Let the gpmi_begin() re-compute the timing again. */
this->flags &= ~GPMI_TIMING_INIT_OK;
this->flags |= GPMI_ASYNC_EDO_ENABLED;
this->timing_mode = mode;
dev_info(this->dev, "enable the asynchronous EDO mode %d\n", mode);
@ -964,6 +967,11 @@ void gpmi_begin(struct gpmi_nand_data *this)
goto err_out;
}
/* Only initialize the timing once */
if (this->flags & GPMI_TIMING_INIT_OK)
return;
this->flags |= GPMI_TIMING_INIT_OK;
if (this->flags & GPMI_ASYNC_EDO_ENABLED)
gpmi_compute_edo_timing(this, &hw);
else

Просмотреть файл

@ -124,6 +124,7 @@ struct nand_timing {
struct gpmi_nand_data {
/* flags */
#define GPMI_ASYNC_EDO_ENABLED (1 << 0)
#define GPMI_TIMING_INIT_OK (1 << 1)
int flags;
/* System Interface */