alim15x3: backport short cables support from pata_ali.c

Backport short cables support from pata_ali.c and while at it cleanup
existing cable detection code.

This patch should allow UDMA > 2 modes on HP Pavilion N5430 and Fujitsu P2000.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Acked-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>

1 files changed, 48 insertions, 23 deletions

diff --git a/drivers/ide/pci/alim15x3.c b/drivers/ide/pci/alim15x3.c
index d52c54bb6a78..8a6b27b3bcc3 100644
--- a/drivers/ide/pci/alim15x3.c
+++ b/drivers/ide/pci/alim15x3.c
@@ -1,5 +1,5 @@
 /*
- * linux/drivers/ide/pci/alim15x3.c             Version 0.21    2007/02/03
+ * linux/drivers/ide/pci/alim15x3.c             Version 0.25    Jun 9 2007
  *
  *  Copyright (C) 1998-2000 Michel Aubry, Maintainer
  *  Copyright (C) 1998-2000 Andrzej Krzysztofowicz, Maintainer
@@ -10,6 +10,7 @@
  *  Copyright (C) 2002 Alan Cox <alan@redhat.com>
  *  ALi (now ULi M5228) support by Clear Zhang <Clear.Zhang@ali.com.tw>
  *  Copyright (C) 2007 MontaVista Software, Inc. <source@mvista.com>
+ *  Copyright (C) 2007 Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
  *
  *  (U)DMA capable version of ali 1533/1543(C), 1535(D)
  *
@@ -36,6 +37,7 @@
 #include <linux/hdreg.h>
 #include <linux/ide.h>
 #include <linux/init.h>
+#include <linux/dmi.h>
 
 #include <asm/io.h>
 
@@ -583,6 +585,35 @@ out:
         return 0;
 }
 
+/*
+ *      Cable special cases
+ */
+
+static struct dmi_system_id cable_dmi_table[] = {
+        {
+                .ident = "HP Pavilion N5430",
+                .matches = {
+                        DMI_MATCH(DMI_BOARD_VENDOR, "Hewlett-Packard"),
+                        DMI_MATCH(DMI_BOARD_NAME, "OmniBook N32N-736"),
+                },
+        },
+        { }
+};
+
+static int ali_cable_override(struct pci_dev *pdev)
+{
+        /* Fujitsu P2000 */
+        if (pdev->subsystem_vendor == 0x10CF &&
+            pdev->subsystem_device == 0x10AF)
+                return 1;
+
+        /* Systems by DMI */
+        if (dmi_check_system(cable_dmi_table))
+                return 1;
+
+        return 0;
+}
+
 /**
  *      ata66_ali15x3   -       check for UDMA 66 support
  *      @hwif: IDE interface
@@ -597,34 +628,28 @@ out:
 static u8 __devinit ata66_ali15x3(ide_hwif_t *hwif)
 {
         struct pci_dev *dev     = hwif->pci_dev;
-        unsigned int ata66      = 0;
-        u8 cable_80_pin[2]      = { 0, 0 };
-
         unsigned long flags;
-        u8 tmpbyte;
+        u8 cbl = ATA_CBL_PATA40, tmpbyte;
 
         local_irq_save(flags);
 
         if (m5229_revision >= 0xC2) {
                 /*
-                 * Ultra66 cable detection (from Host View)
-                 * m5229, 0x4a, bit0: primary, bit1: secondary 80 pin
-                 */
-                pci_read_config_byte(dev, 0x4a, &tmpbyte);
-                /*
-                 * 0x4a, bit0 is 0 => primary channel
-                 * has 80-pin (from host view)
+                 * m5229 80-pin cable detection (from Host View)
+                 *
+                 * 0x4a bit0 is 0 => primary channel has 80-pin
+                 * 0x4a bit1 is 0 => secondary channel has 80-pin
+                 *
+                 * Certain laptops use short but suitable cables
+                 * and don't implement the detect logic.
                  */
-                if (!(tmpbyte & 0x01)) cable_80_pin[0] = 1;
-                /*
-                 * 0x4a, bit1 is 0 => secondary channel
-                 * has 80-pin (from host view)
-                 */
-                if (!(tmpbyte & 0x02)) cable_80_pin[1] = 1;
-                /*
-                 * Allow ata66 if cable of current channel has 80 pins
-                 */
-                ata66 = (hwif->channel)?cable_80_pin[1]:cable_80_pin[0];
+                if (ali_cable_override(dev))
+                        cbl = ATA_CBL_PATA40_SHORT;
+                else {
+                        pci_read_config_byte(dev, 0x4a, &tmpbyte);
+                        if ((tmpbyte & (1 << hwif->channel)) == 0)
+                                cbl = ATA_CBL_PATA80;
+                }
         } else {
                 /*
                  * check m1533, 0x5e, bit 1~4 == 1001 => & 00011110 = 00010010
@@ -657,7 +682,7 @@ static u8 __devinit ata66_ali15x3(ide_hwif_t *hwif)
 
         local_irq_restore(flags);
 
-        return ata66 ? ATA_CBL_PATA80 : ATA_CBL_PATA40;
+        return cbl;
 }
 
 /**