pata_pdc2027x: PLL detection fixes

[linux-2.6-omap-h63xx.git] / drivers / ata / pata_pdc2027x.c

diff --git a/drivers/ata/pata_pdc2027x.c b/drivers/ata/pata_pdc2027x.c
index 69a5aa4949f5b358bf6382eaceea694fb92a91c1..e3245b36269a2cd64257a228c131b68c683ba1cd 100644 (file)
--- a/drivers/ata/pata_pdc2027x.c
+++ b/drivers/ata/pata_pdc2027x.c
@@ -563,13 +563,13 @@ static long pdc_read_counter(struct ata_host *host)
        u32 bccrl, bccrh, bccrlv, bccrhv;
 
 retry:
-       bccrl = readl(mmio_base + PDC_BYTE_COUNT) & 0xffff;
-       bccrh = readl(mmio_base + PDC_BYTE_COUNT + 0x100) & 0xffff;
+       bccrl = readl(mmio_base + PDC_BYTE_COUNT) & 0x7fff;
+       bccrh = readl(mmio_base + PDC_BYTE_COUNT + 0x100) & 0x7fff;
        rmb();
 
        /* Read the counter values again for verification */
-       bccrlv = readl(mmio_base + PDC_BYTE_COUNT) & 0xffff;
-       bccrhv = readl(mmio_base + PDC_BYTE_COUNT + 0x100) & 0xffff;
+       bccrlv = readl(mmio_base + PDC_BYTE_COUNT) & 0x7fff;
+       bccrhv = readl(mmio_base + PDC_BYTE_COUNT + 0x100) & 0x7fff;
        rmb();
 
        counter = (bccrh << 15) | bccrl;
@@ -692,16 +692,16 @@ static long pdc_detect_pll_input_clock(struct ata_host *host)
        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);
        PDPRINTK("scr[%X]\n", scr);
        writel(scr | (0x01 << 14), mmio_base + PDC_SYS_CTL);
        readl(mmio_base + PDC_SYS_CTL); /* flush */
 
+       /* Read current counter value */
+       start_count = pdc_read_counter(host);
+       do_gettimeofday(&start_time);
+
        /* Let the counter run for 100 ms. */
        mdelay(100);
 
@@ -719,7 +719,7 @@ static long pdc_detect_pll_input_clock(struct ata_host *host)
        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 *
+       pll_clock = ((start_count - end_count) & 0x3fffffff) / 100 *
                (100000000 / usec_elapsed);
 
        PDPRINTK("start[%ld] end[%ld] \n", start_count, end_count);