cmd640: always auto-tune PIO
* Default to tuning PIO0 and disabling prefetch prior to probing devices for CONFIG_BLK_DEV_CMD640_ENHANCED=y case. * Always auto-tune PIO. * Remove no longer used retrieve_drive_counts(). Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
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@ -380,6 +380,7 @@ static void cmd640_dump_regs(void)
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}
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#endif
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#ifndef CONFIG_BLK_DEV_CMD640_ENHANCED
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/*
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* Check whether prefetch is on for a drive,
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* and initialize the unmask flags for safe operation.
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@ -400,9 +401,7 @@ static void __init check_prefetch(ide_drive_t *drive, unsigned int index)
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drive->no_io_32bit = 0;
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}
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}
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#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
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#else
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/*
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* Sets prefetch mode for a drive.
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*/
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@ -458,34 +457,6 @@ static inline u8 pack_nibbles(u8 upper, u8 lower)
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return ((upper & 0x0f) << 4) | (lower & 0x0f);
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}
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/*
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* This routine retrieves the initial drive timings from the chipset.
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*/
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static void __init retrieve_drive_counts(unsigned int index)
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{
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u8 b;
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/*
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* Get the internal setup timing, and convert to clock count
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*/
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b = get_cmd640_reg(arttim_regs[index]) & ~0x3f;
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switch (b) {
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case 0x00: b = 4; break;
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case 0x80: b = 3; break;
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case 0x40: b = 2; break;
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default: b = 5; break;
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}
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setup_counts[index] = b;
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/*
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* Get the active/recovery counts
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*/
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b = get_cmd640_reg(drwtim_regs[index]);
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active_counts[index] = (b >> 4) ? (b >> 4) : 0x10;
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recovery_counts[index] = (b & 0x0f) ? (b & 0x0f) : 0x10;
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}
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/*
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* This routine writes the prepared setup/active/recovery counts
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* for a drive into the cmd640 chipset registers to active them.
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@ -683,7 +654,6 @@ static const struct ide_port_info cmd640_port_info __initdata = {
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.chipset = ide_cmd640,
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.host_flags = IDE_HFLAG_SERIALIZE |
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IDE_HFLAG_NO_DMA |
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IDE_HFLAG_NO_AUTOTUNE |
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IDE_HFLAG_ABUSE_PREFETCH |
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IDE_HFLAG_ABUSE_FAST_DEVSEL,
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#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
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@ -866,29 +836,16 @@ static int __init cmd640x_init(void)
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}
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#ifdef CONFIG_BLK_DEV_CMD640_ENHANCED
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if (drive->autotune || ((index > 1) && second_port_toggled)) {
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/*
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* Reset timing to the slowest speed and turn off
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* prefetch. This way, the drive identify code has
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* a better chance.
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*/
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setup_counts [index] = 4; /* max possible */
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active_counts [index] = 16; /* max possible */
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recovery_counts [index] = 16; /* max possible */
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program_drive_counts(drive, index);
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set_prefetch_mode(drive, index, 0);
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printk("cmd640: drive%d timings/prefetch cleared\n", index);
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} else {
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/*
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* Record timings/prefetch without changing them.
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* This preserves any prior BIOS setup.
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*/
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retrieve_drive_counts (index);
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check_prefetch(drive, index);
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printk("cmd640: drive%d timings/prefetch(%s) preserved",
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index, drive->no_io_32bit ? "off" : "on");
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display_clocks(index);
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}
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/*
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* Reset timing to the slowest speed and turn off prefetch.
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* This way, the drive identify code has a better chance.
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*/
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setup_counts [index] = 4; /* max possible */
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active_counts [index] = 16; /* max possible */
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recovery_counts [index] = 16; /* max possible */
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program_drive_counts(drive, index);
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set_prefetch_mode(drive, index, 0);
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printk("cmd640: drive%d timings/prefetch cleared\n", index);
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#else
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/*
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* Set the drive unmask flags to match the prefetch setting
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