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authorBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2007-02-17 02:40:20 +0100
committerBartlomiej Zolnierkiewicz <bzolnier@gmail.com>2007-02-17 02:40:20 +0100
commit39baf8a798926eb675c9360d5822ca86ed92866e (patch)
treee9caacbf354d74c72f9cdfc086442a43147edd6a /drivers/ide/pci/atiixp.c
parent296d9bcc00c7180d327235d6f1e4b7f4ac0166a1 (diff)
atiixp/jmicron/triflex: fix PIO fallback
* atiixp: if DMA can't be used atiixp_config_drive_for_dma() should return 0, atiixp_dma_check() will tune the correct PIO mode anyway * jmicron: if DMA can't be used config_chipset_for_dma() should return 0, micron_config_drive_for_dma() will tune the correct PIO mode anyway config_jmicron_chipset_for_pio(drive, !speed) doesn't program device transfer mode for speed != 0 (only wastes some CPU cycles on ide_get_best_pio_mode() call) so remove it * triflex: if DMA can't be used triflex_config_drive_for_dma() should return 0, triflex_config_drive_xfer_rate() will tune correct PIO mode anyway Above changes also fix (theoretical) issue when ->speedproc fails to set device transfer mode (i.e. when ide_config_drive_speed() fails to program it) but one of DMA transfer modes is already enabled on the device by the BIOS. In such scenario ide_dma_enable() will incorrectly return true statement and ->ide_dma_check will try to enable DMA on the device. Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Diffstat (limited to 'drivers/ide/pci/atiixp.c')
-rw-r--r--drivers/ide/pci/atiixp.c7
1 files changed, 2 insertions, 5 deletions
diff --git a/drivers/ide/pci/atiixp.c b/drivers/ide/pci/atiixp.c
index 982ac31fa99..922b315da4a 100644
--- a/drivers/ide/pci/atiixp.c
+++ b/drivers/ide/pci/atiixp.c
@@ -235,11 +235,8 @@ static int atiixp_config_drive_for_dma(ide_drive_t *drive)
{
u8 speed = ide_dma_speed(drive, atiixp_ratemask(drive));
- /* If no DMA speed was available then disable DMA and use PIO. */
- if (!speed) {
- u8 tspeed = ide_get_best_pio_mode(drive, 255, 5, NULL);
- speed = atiixp_dma_2_pio(XFER_PIO_0 + tspeed) + XFER_PIO_0;
- }
+ if (!speed)
+ return 0;
(void) atiixp_speedproc(drive, speed);
return ide_dma_enable(drive);