[libata] sata_mv: Add a new mv_sff_check_status() function to sata_mv.
This is necessary for use with the upcoming "mv_qc_issue_fis()" patch,
but is being added separately here for easier code review.
When using command issue via the "mv_qc_issue_fis()" mechanism,
the initial ATA_BUSY bit does not show in the ATA status (shadow) register.
This can confuse libata! So here we add a hook to fake ATA_BUSY
for that situation, until the first time a BUSY, DRQ, or ERR bit is seen.
Signed-off-by: Mark Lord <mlord@pobox.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
index b74af94..542e244 100644
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -370,6 +370,7 @@
MV_PP_FLAG_NCQ_EN = (1 << 1), /* is EDMA set up for NCQ? */
MV_PP_FLAG_FBS_EN = (1 << 2), /* is EDMA set up for FBS? */
MV_PP_FLAG_DELAYED_EH = (1 << 3), /* delayed dev err handling */
+ MV_PP_FLAG_FAKE_ATA_BUSY = (1 << 4), /* ignore initial ATA_DRDY */
};
#define IS_GEN_I(hpriv) ((hpriv)->hp_flags & MV_HP_GEN_I)
@@ -570,6 +571,7 @@
static void mv_bmdma_start(struct ata_queued_cmd *qc);
static void mv_bmdma_stop(struct ata_queued_cmd *qc);
static u8 mv_bmdma_status(struct ata_port *ap);
+static u8 mv_sff_check_status(struct ata_port *ap);
/* .sg_tablesize is (MV_MAX_SG_CT / 2) in the structures below
* because we have to allow room for worst case splitting of
@@ -619,6 +621,7 @@
.softreset = mv_softreset,
.error_handler = mv_pmp_error_handler,
+ .sff_check_status = mv_sff_check_status,
.sff_irq_clear = mv_sff_irq_clear,
.check_atapi_dma = mv_check_atapi_dma,
.bmdma_setup = mv_bmdma_setup,
@@ -1284,7 +1287,8 @@
/* set up non-NCQ EDMA configuration */
cfg = EDMA_CFG_Q_DEPTH; /* always 0x1f for *all* chips */
- pp->pp_flags &= ~(MV_PP_FLAG_FBS_EN | MV_PP_FLAG_NCQ_EN);
+ pp->pp_flags &=
+ ~(MV_PP_FLAG_FBS_EN | MV_PP_FLAG_NCQ_EN | MV_PP_FLAG_FAKE_ATA_BUSY);
if (IS_GEN_I(hpriv))
cfg |= (1 << 8); /* enab config burst size mask */
@@ -1791,6 +1795,33 @@
}
/**
+ * mv_sff_check_status - fetch device status, if valid
+ * @ap: ATA port to fetch status from
+ *
+ * When using command issue via mv_qc_issue_fis(),
+ * the initial ATA_BUSY state does not show up in the
+ * ATA status (shadow) register. This can confuse libata!
+ *
+ * So we have a hook here to fake ATA_BUSY for that situation,
+ * until the first time a BUSY, DRQ, or ERR bit is seen.
+ *
+ * The rest of the time, it simply returns the ATA status register.
+ */
+static u8 mv_sff_check_status(struct ata_port *ap)
+{
+ u8 stat = ioread8(ap->ioaddr.status_addr);
+ struct mv_port_priv *pp = ap->private_data;
+
+ if (pp->pp_flags & MV_PP_FLAG_FAKE_ATA_BUSY) {
+ if (stat & (ATA_BUSY | ATA_DRQ | ATA_ERR))
+ pp->pp_flags &= ~MV_PP_FLAG_FAKE_ATA_BUSY;
+ else
+ stat = ATA_BUSY;
+ }
+ return stat;
+}
+
+/**
* mv_qc_issue - Initiate a command to the host
* @qc: queued command to start
*
@@ -1811,6 +1842,8 @@
u32 in_index;
unsigned int port_irqs;
+ pp->pp_flags &= ~MV_PP_FLAG_FAKE_ATA_BUSY; /* paranoia */
+
switch (qc->tf.protocol) {
case ATA_PROT_DMA:
case ATA_PROT_NCQ:
@@ -3038,6 +3071,8 @@
mv_reset_channel(hpriv, mmio, ap->port_no);
pp->pp_flags &= ~MV_PP_FLAG_EDMA_EN;
+ pp->pp_flags &=
+ ~(MV_PP_FLAG_FBS_EN | MV_PP_FLAG_NCQ_EN | MV_PP_FLAG_FAKE_ATA_BUSY);
/* Workaround for errata FEr SATA#10 (part 2) */
do {