diff options
Diffstat (limited to 'drivers/ata/sata_nv.c')
| -rw-r--r-- | drivers/ata/sata_nv.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/ata/sata_nv.c b/drivers/ata/sata_nv.c index f7a963eb1f02..91f24b1a2dc3 100644 --- a/drivers/ata/sata_nv.c +++ b/drivers/ata/sata_nv.c @@ -214,6 +214,7 @@ struct nv_adma_port_priv { struct nv_adma_prd *aprd; dma_addr_t aprd_dma; u8 flags; + int last_issue_ncq; }; #define NV_ADMA_CHECK_INTR(GCTL, PORT) ((GCTL) & ( 1 << (19 + (12 * (PORT))))) @@ -1151,6 +1152,7 @@ static unsigned int nv_adma_qc_issue(struct ata_queued_cmd *qc) { struct nv_adma_port_priv *pp = qc->ap->private_data; void __iomem *mmio = nv_adma_ctl_block(qc->ap); + int curr_ncq = (qc->tf.protocol == ATA_PROT_NCQ); VPRINTK("ENTER\n"); @@ -1166,6 +1168,14 @@ static unsigned int nv_adma_qc_issue(struct ata_queued_cmd *qc) /* write append register, command tag in lower 8 bits and (number of cpbs to append -1) in top 8 bits */ wmb(); + + if(curr_ncq != pp->last_issue_ncq) { + /* Seems to need some delay before switching between NCQ and non-NCQ + commands, else we get command timeouts and such. */ + udelay(20); + pp->last_issue_ncq = curr_ncq; + } + writew(qc->tag, mmio + NV_ADMA_APPEND); DPRINTK("Issued tag %u\n",qc->tag); |