mtd: gpmi: do not get the clock frequency in gpmi_begin()

The current code will gets the clock frequency which is used by
gpmi_nfc_compute_hardware_timing(). It makes the code a little mess.

So move the `get clock frequency` code to the
gpmi_nfc_compute_hardware_timing() itself. This makes the code tidy
and clean.

This patch also uses the macro NSEC_PER_SEC to replace the `1000000000`.

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>

diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-lib.c b/drivers/mtd/nand/gpmi-nand/gpmi-lib.c
index c95dbe8..41e905d 100644 (file)
--- a/drivers/mtd/nand/gpmi-nand/gpmi-lib.c
+++ b/drivers/mtd/nand/gpmi-nand/gpmi-lib.c
@@ -293,6 +293,7 @@ static int gpmi_nfc_compute_hardware_timing(struct gpmi_nand_data *this,
                                        struct gpmi_nfc_hardware_timing *hw)
 {
        struct timing_threshod *nfc = &timing_default_threshold;
+       struct resources *r = &this->resources;
        struct nand_chip *nand = &this->nand;
        struct nand_timing target = this->timing;
        bool improved_timing_is_available;
@@ -332,8 +333,9 @@ static int gpmi_nfc_compute_hardware_timing(struct gpmi_nand_data *this,
                (target.tRHOH_in_ns >= 0) ;
 
        /* Inspect the clock. */
+       nfc->clock_frequency_in_hz = clk_get_rate(r->clock[0]);
        clock_frequency_in_hz = nfc->clock_frequency_in_hz;
-       clock_period_in_ns    = 1000000000 / clock_frequency_in_hz;
+       clock_period_in_ns    = NSEC_PER_SEC / clock_frequency_in_hz;
 
        /*
         * The NFC quantizes setup and hold parameters in terms of clock cycles.
@@ -738,7 +740,6 @@ return_results:
 void gpmi_begin(struct gpmi_nand_data *this)
 {
        struct resources *r = &this->resources;
-       struct timing_threshod *nfc = &timing_default_threshold;
        void __iomem *gpmi_regs = r->gpmi_regs;
        unsigned int   clock_period_in_ns;
        uint32_t       reg;
@@ -753,10 +754,6 @@ void gpmi_begin(struct gpmi_nand_data *this)
                goto err_out;
        }
 
-       /* Get the timing information we need. */
-       nfc->clock_frequency_in_hz = clk_get_rate(r->clock[0]);
-       clock_period_in_ns = 1000000000 / nfc->clock_frequency_in_hz;
-
        gpmi_nfc_compute_hardware_timing(this, &hw);
 
        /* [1] Set HW_GPMI_TIMING0 */
@@ -801,6 +798,7 @@ void gpmi_begin(struct gpmi_nand_data *this)
         *
         * Calculate the amount of time we need to wait, in microseconds.
         */
+       clock_period_in_ns = NSEC_PER_SEC / clk_get_rate(r->clock[0]);
        dll_wait_time_in_us = (clock_period_in_ns * 64) / 1000;
 
        if (!dll_wait_time_in_us)