From: Sergei Shtylyov Date: Tue, 31 Mar 2009 18:15:27 +0000 (+0200) Subject: ide-iops: only clear DMA words on setting DMA mode X-Git-Tag: firefly_0821_release~14993^2~14 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=c419993;p=firefly-linux-kernel-4.4.55.git ide-iops: only clear DMA words on setting DMA mode The bytes indicating current DMA mode in the identify data words 62, 63, and 88 should only change on setting a DMA mode, so stop clearing them on setting PIO mode in ide_config_drive_speed(). While at it, correct SW/MW DMA mode masks... Signed-off-by: Sergei Shtylyov Signed-off-by: Bartlomiej Zolnierkiewicz --- diff --git a/drivers/ide/ide-iops.c b/drivers/ide/ide-iops.c index 5403e4a44be4..0e62698146b6 100644 --- a/drivers/ide/ide-iops.c +++ b/drivers/ide/ide-iops.c @@ -386,9 +386,11 @@ int ide_config_drive_speed(ide_drive_t *drive, u8 speed) return error; } - id[ATA_ID_UDMA_MODES] &= ~0xFF00; - id[ATA_ID_MWDMA_MODES] &= ~0x0F00; - id[ATA_ID_SWDMA_MODES] &= ~0x0F00; + if (speed >= XFER_SW_DMA_0) { + id[ATA_ID_UDMA_MODES] &= ~0xFF00; + id[ATA_ID_MWDMA_MODES] &= ~0x0700; + id[ATA_ID_SWDMA_MODES] &= ~0x0700; + } skip: #ifdef CONFIG_BLK_DEV_IDEDMA