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List: linux-ide
Subject: [PATCH] sl82c105: DMA support fixes
From: Sergei Shtylyov <sshtylyov () ru ! mvista ! com>
Date: 2007-01-30 20:32:22
Message-ID: 200701302332.22543.sshtylyov () ru ! mvista ! com
[Download RAW message or body]
Fix a number of issues with the DMA support code:
- driver claims support for all SW/MW DMA modes while supporting only MWDMA2;
- ide_dma_check() method tries to enable DMA on the "known good" drives which
don't support MWDMA2;
- ide_dma_on() method upon failure to set drive to MWDMA2 re-tunes already
tuned PIO mode and calls ide_dma_off() method instead of returning error;
- ide_dma_off() method sets drive->current_speed while it doesn't actually
change (only the PIO timings are re-loaded into the chip's registers);
- init_hwif() method forcibly sets/resets both "drive DMA capable" bits while
this is properly handled by ide_dma_{on,off}() methods being called later...
Signed-off-by: Sergei Shtylyov <sshtylyov@ru.mvista.com>
drivers/ide/pci/sl82c105.c | 18 ++++--------------
1 files changed, 4 insertions(+), 14 deletions(-)
Index: linux-2.6/drivers/ide/pci/sl82c105.c
===================================================================
--- linux-2.6.orig/drivers/ide/pci/sl82c105.c
+++ linux-2.6/drivers/ide/pci/sl82c105.c
@@ -164,7 +164,7 @@ static int sl82c105_check_drive (ide_dri
return hwif->ide_dma_on(drive);
}
- if (__ide_dma_good_drive(drive))
+ if (__ide_dma_good_drive(drive) && id->eide_dma_time < 150)
return hwif->ide_dma_on(drive);
} while (0);
@@ -259,10 +259,8 @@ static int sl82c105_ide_dma_on (ide_driv
{
DBG(("sl82c105_ide_dma_on(drive:%s)\n", drive->name));
- if (config_for_dma(drive)) {
- config_for_pio(drive, 4, 0, 0);
- return HWIF(drive)->ide_dma_off_quietly(drive);
- }
+ if (config_for_dma(drive))
+ return 1;
printk(KERN_INFO "%s: DMA enabled\n", drive->name);
return __ide_dma_on(drive);
}
@@ -278,7 +276,6 @@ static int sl82c105_ide_dma_off_quietly
if (drive->pio_speed)
speed = drive->pio_speed - XFER_PIO_0;
config_for_pio(drive, speed, 0, 1);
- drive->current_speed = drive->pio_speed;
return rc;
}
@@ -401,11 +398,9 @@ static unsigned int __devinit init_chips
/*
* Initialise the chip
*/
-
static void __devinit init_hwif_sl82c105(ide_hwif_t *hwif)
{
unsigned int rev;
- u8 dma_state;
DBG(("init_hwif_sl82c105(hwif: ide%d)\n", hwif->index));
@@ -431,7 +426,6 @@ static void __devinit init_hwif_sl82c105
if (!hwif->dma_base)
return;
- dma_state = hwif->INB(hwif->dma_base + 2) & ~0x60;
rev = sl82c105_bridge_revision(hwif->pci_dev);
if (rev <= 5) {
/*
@@ -441,11 +435,8 @@ static void __devinit init_hwif_sl82c105
printk(" %s: Winbond 553 bridge revision %d, BM-DMA disabled\n",
hwif->name, rev);
} else {
- dma_state |= 0x60;
-
hwif->atapi_dma = 1;
- hwif->mwdma_mask = 0x07;
- hwif->swdma_mask = 0x07;
+ hwif->mwdma_mask = 0x04;
hwif->ide_dma_check = &sl82c105_check_drive;
hwif->ide_dma_on = &sl82c105_ide_dma_on;
@@ -462,7 +453,6 @@ static void __devinit init_hwif_sl82c105
if (hwif->mate)
hwif->serialized = hwif->mate->serialized = 1;
}
- hwif->OUTB(dma_state, hwif->dma_base + 2);
}
static ide_pci_device_t sl82c105_chipset __devinitdata = {
-
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