Re: [PATCH libata #promise-sata-pata] sata_promise: 2037x PATAPI support

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Mikael Pettersson wrote:
@@ -789,8 +789,14 @@ static void pdc_exec_command_mmio(struct
 static int pdc_check_atapi_dma(struct ata_queued_cmd *qc)
 {
 	u8 *scsicmd = qc->scsicmd->cmnd;
+	struct ata_port *ap = qc->ap;
+	struct pdc_host_priv *hp = ap->host->private_data;
 	int pio = 1; /* atapi dma off by default */
+ /* First generation chips cannot use ATAPI DMA on SATA ports */
+	if (!(hp->flags & PDC_FLAG_GEN_II) && sata_scr_valid(ap))
+		return 1;
+
 	/* Whitelist commands that may use DMA. */
 	switch (scsicmd[0]) {
 	case WRITE_12:


IMO creating a new check_atapi_dma function for first-gen chips would be the preferred way to add this check.

	Jeff


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