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pata_scc.c: Workaround for errata A308
Workaround for errata A308: turn down the UDMA mode and retry the DMA command when the data lost condition is detected. Signed-off-by: Kou Ishizaki <kou.ishizaki@toshiba.co.jp> Signed-off-by: Akira Iguchi <akira2.iguchi@toshiba.co.jp> Signed-off-by: Jeff Garzik <jeff@garzik.org>
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1 changed files with 33 additions and 13 deletions
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@ -238,6 +238,12 @@ static void scc_set_dmamode (struct ata_port *ap, struct ata_device *adev)
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else
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offset = 0; /* 100MHz */
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/* errata A308 workaround: limit ATAPI UDMA mode to UDMA4 */
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if (adev->class == ATA_DEV_ATAPI && speed > XFER_UDMA_4) {
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printk(KERN_INFO "%s: limit ATAPI UDMA to UDMA4\n", DRV_NAME);
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speed = XFER_UDMA_4;
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}
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if (speed >= XFER_UDMA_0)
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idx = speed - XFER_UDMA_0;
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else
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@ -724,22 +730,36 @@ static void scc_bmdma_stop (struct ata_queued_cmd *qc)
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static u8 scc_bmdma_status (struct ata_port *ap)
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{
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u8 host_stat;
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void __iomem *mmio = ap->ioaddr.bmdma_addr;
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u8 host_stat = in_be32(mmio + SCC_DMA_STATUS);
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u32 int_status = in_be32(mmio + SCC_DMA_INTST);
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struct ata_queued_cmd *qc = ata_qc_from_tag(ap, ap->active_tag);
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static int retry = 0;
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host_stat = in_be32(mmio + SCC_DMA_STATUS);
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/* return if IOS_SS is cleared */
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if (!(in_be32(mmio + SCC_DMA_CMD) & ATA_DMA_START))
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return host_stat;
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/* Workaround for PTERADD: emulate DMA_INTR when
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* - IDE_STATUS[ERR] = 1
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* - INT_STATUS[INTRQ] = 1
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* - DMA_STATUS[IORACTA] = 1
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*/
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if (!(host_stat & ATA_DMA_INTR)) {
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u32 int_status = in_be32(mmio + SCC_DMA_INTST);
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if (ata_altstatus(ap) & ATA_ERR &&
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int_status & INTSTS_INTRQ &&
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host_stat & ATA_DMA_ACTIVE)
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host_stat |= ATA_DMA_INTR;
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/* errata A252,A308 workaround: Step4 */
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if (ata_altstatus(ap) & ATA_ERR && int_status & INTSTS_INTRQ)
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return (host_stat | ATA_DMA_INTR);
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/* errata A308 workaround Step5 */
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if (int_status & INTSTS_IOIRQS) {
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host_stat |= ATA_DMA_INTR;
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/* We don't check ATAPI DMA because it is limited to UDMA4 */
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if ((qc->tf.protocol == ATA_PROT_DMA &&
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qc->dev->xfer_mode > XFER_UDMA_4)) {
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if (!(int_status & INTSTS_ACTEINT)) {
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printk(KERN_WARNING "ata%u: data lost occurred. (ACTEINT==0, retry:%d)\n",
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ap->print_id, retry);
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host_stat |= ATA_DMA_ERR;
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if (retry++)
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ap->udma_mask >>= 1;
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} else
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retry = 0;
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}
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}
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return host_stat;
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