opti621: use PCI clock value provided by controller

Use PCI clock value provided by controller instead of depending on
a default (or user supplied) value.

Based on a bugreport from Juergen Kosel & inspired by pata_opti.c code.

Tested-by: Juergen Kosel <juergen.kosel@gmx.de>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

1 files changed, 22 insertions, 20 deletions

diff --git a/drivers/ide/pci/opti621.c b/drivers/ide/pci/opti621.c
index 65f180738947..7547fa2d83ac 100644
--- a/drivers/ide/pci/opti621.c
+++ b/drivers/ide/pci/opti621.c
@@ -193,11 +193,10 @@ typedef struct pio_clocks_s {
         int     recovery_time;  /* Recovery time (clocks) */
 } pio_clocks_t;
 
-static void compute_clocks(int pio, pio_clocks_t *clks)
+static void compute_clocks(int pio, pio_clocks_t *clks, int bus_speed)
 {
         if (pio != PIO_NOT_EXIST) {
                 int adr_setup, data_pls;
-                int bus_speed = ide_pci_clk ? ide_pci_clk : system_bus_clock();
 
                 adr_setup = ide_pio_timings[pio].setup_time;
                 data_pls = ide_pio_timings[pio].active_time;
@@ -234,7 +233,7 @@ static void opti621_set_pio_mode(ide_drive_t *drive, const u8 pio)
         u8 pio1 = 0, pio2 = 0;
         pio_clocks_t first, second;
         int ax, drdy;
-        u8 cycle1, cycle2, misc;
+        u8 cycle1, cycle2, misc, clk;
         ide_hwif_t *hwif = HWIF(drive);
 
         /* sets drive->drive_data for both drives */
@@ -242,8 +241,26 @@ static void opti621_set_pio_mode(ide_drive_t *drive, const u8 pio)
         pio1 = hwif->drives[0].drive_data;
         pio2 = hwif->drives[1].drive_data;
 
-        compute_clocks(pio1, &first);
-        compute_clocks(pio2, &second);
+        spin_lock_irqsave(&opti621_lock, flags);
+
+        reg_base = hwif->io_ports.data_addr;
+
+        /* allow Register-B */
+        outb(0xc0, reg_base + CNTRL_REG);
+        /* hmm, setupvic.exe does this ;-) */
+        outb(0xff, reg_base + 5);
+        /* if reads 0xff, adapter not exist? */
+        (void)inb(reg_base + CNTRL_REG);
+        /* if reads 0xc0, no interface exist? */
+        read_reg(CNTRL_REG);
+
+        /* check CLK speed */
+        clk = read_reg(STRAP_REG) & 1;
+
+        printk(KERN_INFO "%s: CLK = %d MHz\n", hwif->name, clk ? 25 : 33);
+
+        compute_clocks(pio1, &first,  clk ? 25 : 33);
+        compute_clocks(pio2, &second, clk ? 25 : 33);
 
         /* ax = max(a1,a2) */
         ax = (first.address_time < second.address_time) ? second.address_time : first.address_time;
@@ -266,21 +283,6 @@ static void opti621_set_pio_mode(ide_drive_t *drive, const u8 pio)
                 second.recovery_time, drdy);
 #endif
 
-        spin_lock_irqsave(&opti621_lock, flags);
-
-        reg_base = hwif->io_ports.data_addr;
-
-        /* allow Register-B */
-        outb(0xc0, reg_base + CNTRL_REG);
-        /* hmm, setupvic.exe does this ;-) */
-        outb(0xff, reg_base + 5);
-        /* if reads 0xff, adapter not exist? */
-        (void)inb(reg_base + CNTRL_REG);
-        /* if reads 0xc0, no interface exist? */
-        read_reg(CNTRL_REG);
-        /* read version, probably 0 */
-        read_reg(STRAP_REG);
-
         /* program primary drive */
         /* select Index-0 for Register-A */
         write_reg(0, MISC_REG);