Fix DSM/TRIM commands in sata_mv. These need to be issued using old-school "BM DMA", rather than via the EDMA host queue. And since the chips don't have proper BM DMA status, we need to be more careful with setting the ATA_DMA_INTR bit, since DSM/TRIM often has a long delay between "DMA complete" and "command complete". Signed-off-by: Mark Lord <mlord@xxxxxxxxx> --- (my apologies for broken mailers -- patch also attached in case inline is b0rked). --- linux/drivers/ata/sata_mv.c.orig 2010-08-02 13:30:51.000000000 -0400 +++ linux/drivers/ata/sata_mv.c 2010-08-19 20:57:26.785033240 -0400 @@ -1886,19 +1886,25 @@ * LOCKING: * Inherited from caller. */ -static void mv_bmdma_stop(struct ata_queued_cmd *qc) +static void mv_bmdma_stop_ap(struct ata_port *ap) { - struct ata_port *ap = qc->ap; void __iomem *port_mmio = mv_ap_base(ap); u32 cmd; /* clear start/stop bit */ cmd = readl(port_mmio + BMDMA_CMD); - cmd &= ~ATA_DMA_START; - writelfl(cmd, port_mmio + BMDMA_CMD); + if (cmd & ATA_DMA_START) { + cmd &= ~ATA_DMA_START; + writelfl(cmd, port_mmio + BMDMA_CMD); + + /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */ + ata_sff_dma_pause(ap); + } +} - /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */ - ata_sff_dma_pause(ap); +static void mv_bmdma_stop(struct ata_queued_cmd *qc) +{ + mv_bmdma_stop_ap(qc->ap); } /** @@ -1922,8 +1928,21 @@ reg = readl(port_mmio + BMDMA_STATUS); if (reg & ATA_DMA_ACTIVE) status = ATA_DMA_ACTIVE; - else + else if (reg & ATA_DMA_ERR) status = (reg & ATA_DMA_ERR) | ATA_DMA_INTR; + else { + /* + * Just because DMA_ACTIVE is 0 (DMA completed), + * this does _not_ mean the device is "done". + * So we should not yet be signalling ATA_DMA_INTR + * in some cases. Eg. DSM/TRIM, and perhaps others. + */ + mv_bmdma_stop_ap(ap); + if (ioread8(ap->ioaddr.altstatus_addr) & ATA_BUSY) + status = 0; + else + status = ATA_DMA_INTR; + } return status; } @@ -2082,6 +2101,8 @@ if ((tf->protocol != ATA_PROT_DMA) && (tf->protocol != ATA_PROT_NCQ)) return; + if (tf->command == ATA_CMD_DSM) + return; /* use bmdma for this */ /* Fill in Gen IIE command request block */ if (!(tf->flags & ATA_TFLAG_WRITE)) @@ -2277,6 +2298,8 @@ switch (qc->tf.protocol) { case ATA_PROT_DMA: + if (qc->tf.command == ATA_CMD_DSM) + break; /* use bmdma for this */ case ATA_PROT_NCQ: mv_start_edma(ap, port_mmio, pp, qc->tf.protocol); pp->req_idx = (pp->req_idx + 1) & MV_MAX_Q_DEPTH_MASK;
Fix DSM/TRIM commands in sata_mv. These need to be issued using old-school "BM DMA", rather than via the EDMA host queue. And since the chips don't have proper BM DMA status, we need to be more careful with setting the ATA_DMA_INTR bit, since DSM/TRIM often has a long delay between "DMA complete" and "command complete". Signed-off-by: Mark Lord <mlord@xxxxxxxxx> --- linux/drivers/ata/sata_mv.c.orig 2010-08-02 13:30:51.000000000 -0400 +++ linux/drivers/ata/sata_mv.c 2010-08-19 20:57:26.785033240 -0400 @@ -1886,19 +1886,25 @@ * LOCKING: * Inherited from caller. */ -static void mv_bmdma_stop(struct ata_queued_cmd *qc) +static void mv_bmdma_stop_ap(struct ata_port *ap) { - struct ata_port *ap = qc->ap; void __iomem *port_mmio = mv_ap_base(ap); u32 cmd; /* clear start/stop bit */ cmd = readl(port_mmio + BMDMA_CMD); - cmd &= ~ATA_DMA_START; - writelfl(cmd, port_mmio + BMDMA_CMD); + if (cmd & ATA_DMA_START) { + cmd &= ~ATA_DMA_START; + writelfl(cmd, port_mmio + BMDMA_CMD); + + /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */ + ata_sff_dma_pause(ap); + } +} - /* one-PIO-cycle guaranteed wait, per spec, for HDMA1:0 transition */ - ata_sff_dma_pause(ap); +static void mv_bmdma_stop(struct ata_queued_cmd *qc) +{ + mv_bmdma_stop_ap(qc->ap); } /** @@ -1922,8 +1928,21 @@ reg = readl(port_mmio + BMDMA_STATUS); if (reg & ATA_DMA_ACTIVE) status = ATA_DMA_ACTIVE; - else + else if (reg & ATA_DMA_ERR) status = (reg & ATA_DMA_ERR) | ATA_DMA_INTR; + else { + /* + * Just because DMA_ACTIVE is 0 (DMA completed), + * this does _not_ mean the device is "done". + * So we should not yet be signalling ATA_DMA_INTR + * in some cases. Eg. DSM/TRIM, and perhaps others. + */ + mv_bmdma_stop_ap(ap); + if (ioread8(ap->ioaddr.altstatus_addr) & ATA_BUSY) + status = 0; + else + status = ATA_DMA_INTR; + } return status; } @@ -2082,6 +2101,8 @@ if ((tf->protocol != ATA_PROT_DMA) && (tf->protocol != ATA_PROT_NCQ)) return; + if (tf->command == ATA_CMD_DSM) + return; /* use bmdma for this */ /* Fill in Gen IIE command request block */ if (!(tf->flags & ATA_TFLAG_WRITE)) @@ -2277,6 +2298,8 @@ switch (qc->tf.protocol) { case ATA_PROT_DMA: + if (qc->tf.command == ATA_CMD_DSM) + break; /* use bmdma for this */ case ATA_PROT_NCQ: mv_start_edma(ap, port_mmio, pp, qc->tf.protocol); pp->req_idx = (pp->req_idx + 1) & MV_MAX_Q_DEPTH_MASK;