From 2fd673ecf0378ddeeeb87b3605e50212e0c0ddc6 Mon Sep 17 00:00:00 2001
From: Tejun Heo <tj@kernel.org>
Date: Fri, 29 Aug 2008 16:13:12 +0200
Subject: sata_nv: disable hardreset for generic
of them being unifying probing, hotplug and EH reset paths uniform.
Previously, broken hardreset could go unnoticed as it wasn't used
during probing but when something goes wrong or after hotplug the
problem will surface and bite hard.
OSDL bug 11195 reports that sata_nv generic flavor falls into this
category. Hardreset itself succeeds but PHY stays offline after
hardreset. I tried longer debounce timing but the result was the
same.
http://bugzilla.kernel.org/show_bug.cgi?id=11195
So, it seems we'll have to drop hardreset from the generic flavor.
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Peer Chen <pchen@nvidia.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
---
drivers/ata/sata_nv.c | 19 +------------------
1 file changed, 1 insertion(+), 18 deletions(-)
(limited to 'drivers/ata/sata_nv.c')
diff --git a/drivers/ata/sata_nv.c b/drivers/ata/sata_nv.c
index 858f70610ed..1e1f3f3757a 100644
--- a/drivers/ata/sata_nv.c
+++ b/drivers/ata/sata_nv.c
@@ -309,8 +309,6 @@ static void nv_nf2_freeze(struct ata_port *ap);
static void nv_nf2_thaw(struct ata_port *ap);
static void nv_ck804_freeze(struct ata_port *ap);
static void nv_ck804_thaw(struct ata_port *ap);
-static int nv_hardreset(struct ata_link *link, unsigned int *class,
- unsigned long deadline);
static int nv_adma_slave_config(struct scsi_device *sdev);
static int nv_adma_check_atapi_dma(struct ata_queued_cmd *qc);
static void nv_adma_qc_prep(struct ata_queued_cmd *qc);
@@ -407,7 +405,7 @@ static struct scsi_host_template nv_swncq_sht = {
static struct ata_port_operations nv_generic_ops = {
.inherits = &ata_bmdma_port_ops,
- .hardreset = nv_hardreset,
+ .hardreset = ATA_OP_NULL,
.scr_read = nv_scr_read,
.scr_write = nv_scr_write,
};
@@ -1588,21 +1586,6 @@ static void nv_mcp55_thaw(struct ata_port *ap)
ata_sff_thaw(ap);
}
-static int nv_hardreset(struct ata_link *link, unsigned int *class,
- unsigned long deadline)
-{
- int rc;
-
- /* SATA hardreset fails to retrieve proper device signature on
- * some controllers. Request follow up SRST. For more info,
- * see http://bugzilla.kernel.org/show_bug.cgi?id=3352
- */
- rc = sata_sff_hardreset(link, class, deadline);
- if (rc)
- return rc;
- return -EAGAIN;
-}
-
static void nv_adma_error_handler(struct ata_port *ap)
{
struct nv_adma_port_priv *pp = ap->private_data;
--
cgit
From 4c1eb90a0908c0c60db2169dce08fb672e7582f1 Mon Sep 17 00:00:00 2001
From: Tejun Heo <tj@kernel.org>
Date: Sun, 28 Sep 2008 07:39:01 +0900
Subject: sata_nv: reinstate nv_hardreset() for non generic controllers
Commit 2fd673ecf0378ddeeeb87b3605e50212e0c0ddc6 which tried to remove
hardreset for generic accidentally removed it for all flavors as all
others were inheriting from nv_generic_ops. This patch reinstates
nv_hardreset() and puts it into nv_common_ops which all flavors
inherit from. nv_generic_ops now inherits from nv_common_ops and
overrides .hardreset to ATA_OP_NULL.
While at it, explain why nv_hardreset and ATA_OP_NULL override are
necessary.
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
---
drivers/ata/sata_nv.c | 46 ++++++++++++++++++++++++++++++++++++++++------
1 file changed, 40 insertions(+), 6 deletions(-)
(limited to 'drivers/ata/sata_nv.c')
diff --git a/drivers/ata/sata_nv.c b/drivers/ata/sata_nv.c
index 1e1f3f3757a..14601dc05e4 100644
--- a/drivers/ata/sata_nv.c
+++ b/drivers/ata/sata_nv.c
@@ -309,6 +309,8 @@ static void nv_nf2_freeze(struct ata_port *ap);
static void nv_nf2_thaw(struct ata_port *ap);
static void nv_ck804_freeze(struct ata_port *ap);
static void nv_ck804_thaw(struct ata_port *ap);
+static int nv_hardreset(struct ata_link *link, unsigned int *class,
+ unsigned long deadline);
static int nv_adma_slave_config(struct scsi_device *sdev);
static int nv_adma_check_atapi_dma(struct ata_queued_cmd *qc);
static void nv_adma_qc_prep(struct ata_queued_cmd *qc);
@@ -403,28 +405,45 @@ static struct scsi_host_template nv_swncq_sht = {
.slave_configure = nv_swncq_slave_config,
};
-static struct ata_port_operations nv_generic_ops = {
+/* OSDL bz3352 reports that some nv controllers can't determine device
+ * signature reliably and nv_hardreset is implemented to work around
+ * the problem. This was reported on nf3 and it's unclear whether any
+ * other controllers are affected. However, the workaround has been
+ * applied to all variants and there isn't much to gain by trying to
+ * find out exactly which ones are affected at this point especially
+ * because NV has moved over to ahci for newer controllers.
+ */
+static struct ata_port_operations nv_common_ops = {
.inherits = &ata_bmdma_port_ops,
- .hardreset = ATA_OP_NULL,
+ .hardreset = nv_hardreset,
.scr_read = nv_scr_read,
.scr_write = nv_scr_write,
};
+/* OSDL bz11195 reports that link doesn't come online after hardreset
+ * on generic nv's and there have been several other similar reports
+ * on linux-ide. Disable hardreset for generic nv's.
+ */
+static struct ata_port_operations nv_generic_ops = {
+ .inherits = &nv_common_ops,
+ .hardreset = ATA_OP_NULL,
+};
+
static struct ata_port_operations nv_nf2_ops = {
- .inherits = &nv_generic_ops,
+ .inherits = &nv_common_ops,
.freeze = nv_nf2_freeze,
.thaw = nv_nf2_thaw,
};
static struct ata_port_operations nv_ck804_ops = {
- .inherits = &nv_generic_ops,
+ .inherits = &nv_common_ops,
.freeze = nv_ck804_freeze,
.thaw = nv_ck804_thaw,
.host_stop = nv_ck804_host_stop,
};
static struct ata_port_operations nv_adma_ops = {
- .inherits = &nv_generic_ops,
+ .inherits = &nv_common_ops,
.check_atapi_dma = nv_adma_check_atapi_dma,
.sff_tf_read = nv_adma_tf_read,
@@ -448,7 +467,7 @@ static struct ata_port_operations nv_adma_ops = {
};
static struct ata_port_operations nv_swncq_ops = {
- .inherits = &nv_generic_ops,
+ .inherits = &nv_common_ops,
.qc_defer = ata_std_qc_defer,
.qc_prep = nv_swncq_qc_prep,
@@ -1586,6 +1605,21 @@ static void nv_mcp55_thaw(struct ata_port *ap)
ata_sff_thaw(ap);
}
+static int nv_hardreset(struct ata_link *link, unsigned int *class,
+ unsigned long deadline)
+{
+ int rc;
+
+ /* SATA hardreset fails to retrieve proper device signature on
+ * some controllers. Request follow up SRST. For more info,
+ * see http://bugzilla.kernel.org/show_bug.cgi?id=3352
+ */
+ rc = sata_sff_hardreset(link, class, deadline);
+ if (rc)
+ return rc;
+ return -EAGAIN;
+}
+
static void nv_adma_error_handler(struct ata_port *ap)
{
struct nv_adma_port_priv *pp = ap->private_data;
--
cgit
From 82ef04fb4c82542b3eda81cca461f0594ce9cd0b Mon Sep 17 00:00:00 2001
From: Tejun Heo <tj@kernel.org>
Date: Thu, 31 Jul 2008 17:02:40 +0900
Subject: libata: make SCR access ops per-link
Logically, SCR access ops should take @link; however, there was no
compelling reason to convert all SCR access ops when adding @link
abstraction as there's one-to-one mapping between a port and a non-PMP
link. However, that assumption won't hold anymore with the scheduled
addition of slave link.
Make SCR access ops per-link.
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
---
drivers/ata/sata_nv.c | 16 ++++++++--------
1 file changed, 8 insertions(+), 8 deletions(-)
(limited to 'drivers/ata/sata_nv.c')
diff --git a/drivers/ata/sata_nv.c b/drivers/ata/sata_nv.c
index 1e1f3f3757a..88fd4aeacde 100644
--- a/drivers/ata/sata_nv.c
+++ b/drivers/ata/sata_nv.c
@@ -302,8 +302,8 @@ static void nv_ck804_host_stop(struct ata_host *host);
static irqreturn_t nv_generic_interrupt(int irq, void *dev_instance);
static irqreturn_t nv_nf2_interrupt(int irq, void *dev_instance);
static irqreturn_t nv_ck804_interrupt(int irq, void *dev_instance);
-static int nv_scr_read(struct ata_port *ap, unsigned int sc_reg, u32 *val);
-static int nv_scr_write(struct ata_port *ap, unsigned int sc_reg, u32 val);
+static int nv_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val);
+static int nv_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val);
static void nv_nf2_freeze(struct ata_port *ap);
static void nv_nf2_thaw(struct ata_port *ap);
@@ -1492,21 +1492,21 @@ static irqreturn_t nv_ck804_interrupt(int irq, void *dev_instance)
return ret;
}
-static int nv_scr_read(struct ata_port *ap, unsigned int sc_reg, u32 *val)
+static int nv_scr_read(struct ata_link *link, unsigned int sc_reg, u32 *val)
{
if (sc_reg > SCR_CONTROL)
return -EINVAL;
- *val = ioread32(ap->ioaddr.scr_addr + (sc_reg * 4));
+ *val = ioread32(link->ap->ioaddr.scr_addr + (sc_reg * 4));
return 0;
}
-static int nv_scr_write(struct ata_port *ap, unsigned int sc_reg, u32 val)
+static int nv_scr_write(struct ata_link *link, unsigned int sc_reg, u32 val)
{
if (sc_reg > SCR_CONTROL)
return -EINVAL;
- iowrite32(val, ap->ioaddr.scr_addr + (sc_reg * 4));
+ iowrite32(val, link->ap->ioaddr.scr_addr + (sc_reg * 4));
return 0;
}
@@ -2184,9 +2184,9 @@ static void nv_swncq_host_interrupt(struct ata_port *ap, u16 fis)
if (!pp->qc_active)
return;
- if (ap->ops->scr_read(ap, SCR_ERROR, &serror))
+ if (ap->ops->scr_read(&ap->link, SCR_ERROR, &serror))
return;
- ap->ops->scr_write(ap, SCR_ERROR, serror);
+ ap->ops->scr_write(&ap->link, SCR_ERROR, serror);
if (ata_stat & ATA_ERR) {
ata_ehi_clear_desc(ehi);
--
cgit