diff options
Diffstat (limited to 'drivers/ata')
| -rw-r--r-- | drivers/ata/pata_pdc2027x.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/drivers/ata/pata_pdc2027x.c b/drivers/ata/pata_pdc2027x.c index 0d2cc49fde4b..69a5aa4949f5 100644 --- a/drivers/ata/pata_pdc2027x.c +++ b/drivers/ata/pata_pdc2027x.c @@ -689,10 +689,12 @@ static long pdc_detect_pll_input_clock(struct ata_host *host) void __iomem *mmio_base = host->iomap[PDC_MMIO_BAR]; u32 scr; long start_count, end_count; - long pll_clock; + struct timeval start_time, end_time; + long pll_clock, usec_elapsed; /* Read current counter value */ start_count = pdc_read_counter(host); + do_gettimeofday(&start_time); /* Start the test mode */ scr = readl(mmio_base + PDC_SYS_CTL); @@ -705,6 +707,7 @@ static long pdc_detect_pll_input_clock(struct ata_host *host) /* Read the counter values again */ end_count = pdc_read_counter(host); + do_gettimeofday(&end_time); /* Stop the test mode */ scr = readl(mmio_base + PDC_SYS_CTL); @@ -713,7 +716,11 @@ static long pdc_detect_pll_input_clock(struct ata_host *host) readl(mmio_base + PDC_SYS_CTL); /* flush */ /* calculate the input clock in Hz */ - pll_clock = (start_count - end_count) * 10; + usec_elapsed = (end_time.tv_sec - start_time.tv_sec) * 1000000 + + (end_time.tv_usec - start_time.tv_usec); + + pll_clock = (start_count - end_count) / 100 * + (100000000 / usec_elapsed); PDPRINTK("start[%ld] end[%ld] \n", start_count, end_count); PDPRINTK("PLL input clock[%ld]Hz\n", pll_clock); |