summaryrefslogtreecommitdiffstats
path: root/drivers/ata/sata_sil24.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/ata/sata_sil24.c')
-rw-r--r--drivers/ata/sata_sil24.c42
1 files changed, 30 insertions, 12 deletions
diff --git a/drivers/ata/sata_sil24.c b/drivers/ata/sata_sil24.c
index 96fd5260446..864c1c1b851 100644
--- a/drivers/ata/sata_sil24.c
+++ b/drivers/ata/sata_sil24.c
@@ -301,7 +301,7 @@ static struct sil24_cerr_info {
[PORT_CERR_PKT_PROT] = { AC_ERR_HSM, ATA_EH_SOFTRESET,
"invalid data directon for ATAPI CDB" },
[PORT_CERR_SGT_BOUNDARY] = { AC_ERR_SYSTEM, ATA_EH_SOFTRESET,
- "SGT no on qword boundary" },
+ "SGT not on qword boundary" },
[PORT_CERR_SGT_TGTABRT] = { AC_ERR_HOST_BUS, ATA_EH_SOFTRESET,
"PCI target abort while fetching SGT" },
[PORT_CERR_SGT_MSTABRT] = { AC_ERR_HOST_BUS, ATA_EH_SOFTRESET,
@@ -832,16 +832,31 @@ static int sil24_qc_defer(struct ata_queued_cmd *qc)
struct ata_link *link = qc->dev->link;
struct ata_port *ap = link->ap;
u8 prot = qc->tf.protocol;
- int is_atapi = (prot == ATA_PROT_ATAPI ||
- prot == ATA_PROT_ATAPI_NODATA ||
- prot == ATA_PROT_ATAPI_DMA);
-
- /* ATAPI commands completing with CHECK_SENSE cause various
- * weird problems if other commands are active. PMP DMA CS
- * errata doesn't cover all and HSM violation occurs even with
- * only one other device active. Always run an ATAPI command
- * by itself.
- */
+
+ /*
+ * There is a bug in the chip:
+ * Port LRAM Causes the PRB/SGT Data to be Corrupted
+ * If the host issues a read request for LRAM and SActive registers
+ * while active commands are available in the port, PRB/SGT data in
+ * the LRAM can become corrupted. This issue applies only when
+ * reading from, but not writing to, the LRAM.
+ *
+ * Therefore, reading LRAM when there is no particular error [and
+ * other commands may be outstanding] is prohibited.
+ *
+ * To avoid this bug there are two situations where a command must run
+ * exclusive of any other commands on the port:
+ *
+ * - ATAPI commands which check the sense data
+ * - Passthrough ATA commands which always have ATA_QCFLAG_RESULT_TF
+ * set.
+ *
+ */
+ int is_excl = (prot == ATA_PROT_ATAPI ||
+ prot == ATA_PROT_ATAPI_NODATA ||
+ prot == ATA_PROT_ATAPI_DMA ||
+ (qc->flags & ATA_QCFLAG_RESULT_TF));
+
if (unlikely(ap->excl_link)) {
if (link == ap->excl_link) {
if (ap->nr_active_links)
@@ -849,7 +864,7 @@ static int sil24_qc_defer(struct ata_queued_cmd *qc)
qc->flags |= ATA_QCFLAG_CLEAR_EXCL;
} else
return ATA_DEFER_PORT;
- } else if (unlikely(is_atapi)) {
+ } else if (unlikely(is_excl)) {
ap->excl_link = link;
if (ap->nr_active_links)
return ATA_DEFER_PORT;
@@ -1079,10 +1094,13 @@ static void sil24_error_intr(struct ata_port *ap)
if (ci && ci->desc) {
err_mask |= ci->err_mask;
action |= ci->action;
+ if (action & ATA_EH_RESET_MASK)
+ freeze = 1;
ata_ehi_push_desc(ehi, "%s", ci->desc);
} else {
err_mask |= AC_ERR_OTHER;
action |= ATA_EH_SOFTRESET;
+ freeze = 1;
ata_ehi_push_desc(ehi, "unknown command error %d",
cerr);
}