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

drivers/mtd/nand/gpmi-nand/gpmi-lib.c

+8 −0
Original line number Diff line number Diff line
@@ -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

drivers/mtd/nand/gpmi-nand/gpmi-nand.h

+1 −0
Original line number Diff line number Diff line
@@ -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 */