From: Bartlomiej Zolnierkiewicz <bzolnier@xxxxxxxxx>
Subject: [PATCH] via82cxxx: fix UDMA settings programming
* preserve 80-wire cable detection bit
* don't clear UDMA settings when programming PIO/MWDMA modes
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@xxxxxxxxx>
---
drivers/ide/via82cxxx.c | 19 +++++++++++++++++--
1 file changed, 17 insertions(+), 2 deletions(-)
Index: b/drivers/ide/via82cxxx.c
===================================================================
--- a/drivers/ide/via82cxxx.c
+++ b/drivers/ide/via82cxxx.c
@@ -146,10 +146,25 @@ static void via_set_speed(ide_hwif_t *hw
case ATA_UDMA4: t = timing->udma ? (0xe8 | (clamp_val(timing->udma, 2, 9) - 2)) : 0x0f; break;
case ATA_UDMA5: t = timing->udma ? (0xe0 | (clamp_val(timing->udma, 2, 9) - 2)) : 0x07; break;
case ATA_UDMA6: t = timing->udma ? (0xe0 | (clamp_val(timing->udma, 2, 9) - 2)) : 0x07; break;
- default: return;
}
- pci_write_config_byte(dev, VIA_UDMA_TIMING + (3 - dn), t);
+ /* Set UDMA unless device is not UDMA capable */
+ if (vdev->via_config->udma_mask) {
+ u8 udma_etc;
+
+ pci_read_config_byte(dev, VIA_UDMA_TIMING + 3 - dn, &udma_etc);
+
+ /* clear transfer mode bit */
+ udma_etc &= ~0x20;
+
+ if (timing->udma) {
+ /* preserve 80-wire cable detection bit */
+ udma_etc &= 0x10;
+ udma_etc |= t;
+ }
+
+ pci_write_config_byte(dev, VIA_UDMA_TIMING + 3 - dn, udma_etc);
+ }
}
/**
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