Commit 9c95f11b authored by Huang Shijie's avatar Huang Shijie Committed by David Woodhouse

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: default avatarHuang Shijie <b32955@freescale.com>
Signed-off-by: default avatarArtem Bityutskiy <artem.bityutskiy@linux.intel.com>
Signed-off-by: default avatarDavid Woodhouse <David.Woodhouse@intel.com>
parent 995fbbf5
...@@ -914,6 +914,9 @@ static int enable_edo_mode(struct gpmi_nand_data *this, int mode) ...@@ -914,6 +914,9 @@ static int enable_edo_mode(struct gpmi_nand_data *this, int mode)
rate = (mode == 5) ? 100000000 : 80000000; rate = (mode == 5) ? 100000000 : 80000000;
clk_set_rate(r->clock[0], rate); 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->flags |= GPMI_ASYNC_EDO_ENABLED;
this->timing_mode = mode; this->timing_mode = mode;
dev_info(this->dev, "enable the asynchronous EDO mode %d\n", 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) ...@@ -964,6 +967,11 @@ void gpmi_begin(struct gpmi_nand_data *this)
goto err_out; 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) if (this->flags & GPMI_ASYNC_EDO_ENABLED)
gpmi_compute_edo_timing(this, &hw); gpmi_compute_edo_timing(this, &hw);
else else
......
...@@ -124,6 +124,7 @@ struct nand_timing { ...@@ -124,6 +124,7 @@ struct nand_timing {
struct gpmi_nand_data { struct gpmi_nand_data {
/* flags */ /* flags */
#define GPMI_ASYNC_EDO_ENABLED (1 << 0) #define GPMI_ASYNC_EDO_ENABLED (1 << 0)
#define GPMI_TIMING_INIT_OK (1 << 1)
int flags; int flags;
/* System Interface */ /* System Interface */
......
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