Commit ea266ba1 authored by Sergei Shtylyov's avatar Sergei Shtylyov Committed by Bartlomiej Zolnierkiewicz
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sl82c105: DMA support fixes 



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: default avatarSergei Shtylyov <sshtylyov@ru.mvista.com>
Signed-off-by: default avatarBartlomiej Zolnierkiewicz <bzolnier@gmail.com>
parent fed21641

drivers/ide/pci/sl82c105.c

+4 −14
Original line number Diff line number Diff line
@@ -164,7 +164,7 @@ static int sl82c105_check_drive (ide_drive_t *drive) 
				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_drive_t *drive) 
{

	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 (ide_drive_t *drive) 
	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_chipset_sl82c105(struct pci_dev *dev, const c 
/*

 * 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(ide_hwif_t *hwif) 
	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(ide_hwif_t *hwif) 
		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(ide_hwif_t *hwif) 
		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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