Re: [PATCH 1/5] ide: add short cables support

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Hello.

Bartlomiej Zolnierkiewicz wrote:

This patch allows users to override both host and device side cable detection
with "ideX=ata66" kernel parameter.  Thanks to this it should be now possible
to use UDMA > 2 modes on systems (laptops mainly) which use short 40-pin cable
instead of 80-pin one.

Next patches add automatic detection of some systems using short cables.

Changes:

* Rename hwif->udma_four to hwif->cbl and make it u8.

   Not sure if already short word "cable" was worth further shortening. :-)

Index: b/drivers/ide/pci/alim15x3.c
===================================================================
--- a/drivers/ide/pci/alim15x3.c
+++ b/drivers/ide/pci/alim15x3.c
@@ -594,7 +594,7 @@ out:
  *	FIXME: frobs bits that are not defined on newer ALi devicea
  */
-static unsigned int __devinit ata66_ali15x3 (ide_hwif_t *hwif)
+static u8 __devinit ata66_ali15x3(ide_hwif_t *hwif)
 {
 	struct pci_dev *dev	= hwif->pci_dev;
 	unsigned int ata66	= 0;
@@ -657,7 +657,7 @@ static unsigned int __devinit ata66_ali1
local_irq_restore(flags); - return(ata66);
+	return ata66 ? ATA_CBL_PATA80 : ATA_CBL_PATA40;

   Ahem... I'd think it was about the right time to fix the abomination which
those ata66 and cable_80_pin[2] are, something like this:

static unsigned int __devinit ata66_ali15x3 (ide_hwif_t *hwif)
{
        struct pci_dev *dev     = hwif->pci_dev;
        unsigned int cbl        = ATA_CBL_PATA40;
        unsigned long flags;
        u8 tmpbyte, mask	= hwif->channel ? 0x02 : 0x01;

        local_irq_save(flags); /* Not sure if it's necessary... */

        if (m5229_revision >= 0xC2) {
                /*
                 * Ultra66 cable detection (from Host View)
                 * m5229, 0x4a, bit0: primary, bit1: secondary
		 * 0: 80 pin, 1: 40 pin
                 */
                pci_read_config_byte(dev, 0x4a, &tmpbyte);
                /*
                 * Allow ata66 if cable of current channel has 80 pins
                 */
                cbl = (tmpbyte & mask) ? ATA_CBL_PATA40 : ATA_CBL_PATA80;
        } else {

[Following code frankly speaking has no business being in this function]

        local_irq_restore(flags); /* Not sure if it's necessary... */

	return cbl;
 }
/**
Index: b/drivers/ide/pci/serverworks.c
===================================================================
--- a/drivers/ide/pci/serverworks.c
+++ b/drivers/ide/pci/serverworks.c
@@ -329,9 +329,9 @@ static unsigned int __devinit init_chips
 	return dev->irq;
 }
-static unsigned int __devinit ata66_svwks_svwks (ide_hwif_t *hwif)
+static u8 __devinit ata66_svwks_svwks(ide_hwif_t *hwif)
 {
-	return 1;
+	return ATA_CBL_PATA80;
 }

   Hm, worth folding into ata66_svwks()...

 /* On Dell PowerEdge servers with a CSB5/CSB6, the top two bits
@@ -341,7 +341,7 @@ static unsigned int __devinit ata66_svwk
  * Bit 14 clear = primary IDE channel does not have 80-pin cable.
  * Bit 14 set   = primary IDE channel has 80-pin cable.
  */
-static unsigned int __devinit ata66_svwks_dell (ide_hwif_t *hwif)
+static u8 __devinit ata66_svwks_dell(ide_hwif_t *hwif)
 {
 	struct pci_dev *dev = hwif->pci_dev;
 	if (dev->subsystem_vendor == PCI_VENDOR_ID_DELL &&

   Isn't this check duplicating the check in ata66_svwks()?

@@ -359,18 +359,18 @@ static unsigned int __devinit ata66_svwk
  *
  * WARNING: this only works on Alpine hardware!
  */
-static unsigned int __devinit ata66_svwks_cobalt (ide_hwif_t *hwif)
+static u8 __devinit ata66_svwks_cobalt(ide_hwif_t *hwif)
 {
 	struct pci_dev *dev = hwif->pci_dev;
 	if (dev->subsystem_vendor == PCI_VENDOR_ID_SUN &&

   Same question here...

Index: b/drivers/ide/pci/sis5513.c
===================================================================
--- a/drivers/ide/pci/sis5513.c
+++ b/drivers/ide/pci/sis5513.c
@@ -796,7 +796,7 @@ static unsigned int __devinit init_chips
 	return 0;
 }
-static unsigned int __devinit ata66_sis5513 (ide_hwif_t *hwif)
+static u8 __devinit ata66_sis5513(ide_hwif_t *hwif)
 {
 	u8 ata66 = 0;
@@ -811,7 +811,8 @@ static unsigned int __devinit ata66_sis5
 		pci_read_config_byte(hwif->pci_dev, 0x48, &reg48h);
 		ata66 = (reg48h & mask) ? 0 : 1;
 	}
-        return ata66;
+
+	return ata66 ? ATA_CBL_PATA80 : ATA_CBL_PATA40;
 }

That doesn't look good as well. I think we should part with 'ata66' variable here completely...

MBR, Sergei
-
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