diff options
Diffstat (limited to 'drivers/ide/pci/pdc202xx_new.c')
| -rw-r--r-- | drivers/ide/pci/pdc202xx_new.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/ide/pci/pdc202xx_new.c b/drivers/ide/pci/pdc202xx_new.c index cc0bfdcf1f1..0765dce6948 100644 --- a/drivers/ide/pci/pdc202xx_new.c +++ b/drivers/ide/pci/pdc202xx_new.c @@ -306,11 +306,13 @@ static long __devinit read_counter(u32 dma_base) */ static long __devinit detect_pll_input_clock(unsigned long dma_base) { + struct timeval start_time, end_time; long start_count, end_count; - long pll_input; + long pll_input, usec_elapsed; u8 scr1; start_count = read_counter(dma_base); + do_gettimeofday(&start_time); /* Start the test mode */ outb(0x01, dma_base + 0x01); @@ -322,6 +324,7 @@ static long __devinit detect_pll_input_clock(unsigned long dma_base) mdelay(10); end_count = read_counter(dma_base); + do_gettimeofday(&end_time); /* Stop the test mode */ outb(0x01, dma_base + 0x01); @@ -333,7 +336,10 @@ static long __devinit detect_pll_input_clock(unsigned long dma_base) * Calculate the input clock in Hz * (the clock counter is 30 bit wide and counts down) */ - pll_input = ((start_count - end_count) & 0x3ffffff) * 100; + usec_elapsed = (end_time.tv_sec - start_time.tv_sec) * 1000000 + + (end_time.tv_usec - start_time.tv_usec); + pll_input = ((start_count - end_count) & 0x3ffffff) / 10 * + (10000000 / usec_elapsed); DBG("start[%ld] end[%ld]\n", start_count, end_count); |