As DEV_RST (hardreset) sometimes fail to recover the controller
(especially after PMP DMA CS errata). In such cases, perform PORT_RST
prior to DEV_RST.
Signed-off-by: Tejun Heo <htejun@xxxxxxxxx>
---
drivers/ata/sata_sil24.c | 87 +++++++++++++++++++++++++++++++++++-----------
1 files changed, 66 insertions(+), 21 deletions(-)
diff --git a/drivers/ata/sata_sil24.c b/drivers/ata/sata_sil24.c
index 1832adf..75d2e9a 100644
--- a/drivers/ata/sata_sil24.c
+++ b/drivers/ata/sata_sil24.c
@@ -320,6 +320,7 @@ struct sil24_port_priv {
union sil24_cmd_block *cmd_block; /* 32 cmd blocks */
dma_addr_t cmd_block_dma; /* DMA base addr for them */
struct ata_taskfile tf; /* Cached taskfile registers */
+ int do_port_rst;
};
/* ap->host->private_data */
@@ -546,6 +547,29 @@ static void sil24_tf_read(struct ata_por
*tf = pp->tf;
}
+static void sil24_config_port(void __iomem *port, unsigned long port_flags)
+{
+ /* configure IRQ WoC */
+ if (port_flags & SIL24_FLAG_PCIX_IRQ_WOC)
+ writel(PORT_CS_IRQ_WOC, port + PORT_CTRL_STAT);
+ else
+ writel(PORT_CS_IRQ_WOC, port + PORT_CTRL_CLR);
+
+ /* zero error counters. */
+ writel(0x8000, port + PORT_DECODE_ERR_THRESH);
+ writel(0x8000, port + PORT_CRC_ERR_THRESH);
+ writel(0x8000, port + PORT_HSHK_ERR_THRESH);
+ writel(0x0000, port + PORT_DECODE_ERR_CNT);
+ writel(0x0000, port + PORT_CRC_ERR_CNT);
+ writel(0x0000, port + PORT_HSHK_ERR_CNT);
+
+ /* always use 64bit activation */
+ writel(PORT_CS_32BIT_ACTV, port + PORT_CTRL_CLR);
+
+ /* clear port multiplier enable and resume bits */
+ writel(PORT_CS_PMP_EN | PORT_CS_PMP_RESUME, port + PORT_CTRL_CLR);
+}
+
static void sil24_config_pmp(struct ata_port *ap, int attached)
{
void __iomem *port = (void __iomem *)ap->ioaddr.cmd_addr;
@@ -574,6 +598,7 @@ static void sil24_clear_pmp(struct ata_p
static int sil24_init_port(struct ata_port *ap)
{
void __iomem *port = (void __iomem *)ap->ioaddr.cmd_addr;
+ struct sil24_port_priv *pp = ap->private_data;
u32 tmp;
/* clear PMP error status */
@@ -586,8 +611,12 @@ static int sil24_init_port(struct ata_po
tmp = ata_wait_register(port + PORT_CTRL_STAT,
PORT_CS_RDY, 0, 10, 100);
- if ((tmp & (PORT_CS_INIT | PORT_CS_RDY)) != PORT_CS_RDY)
+ if ((tmp & (PORT_CS_INIT | PORT_CS_RDY)) != PORT_CS_RDY) {
+ pp->do_port_rst = 1;
+ ap->link.eh_context.i.action |= ATA_EH_HARDRESET;
return -EIO;
+ }
+
return 0;
}
@@ -696,10 +725,34 @@ static int sil24_hardreset(struct ata_li
{
struct ata_port *ap = link->ap;
void __iomem *port = (void __iomem *)ap->ioaddr.cmd_addr;
+ struct sil24_port_priv *pp = ap->private_data;
+ int did_port_rst = 0;
const char *reason;
int tout_msec, rc;
u32 tmp;
+ retry:
+ /* Sometimes, DEV_RST is not enough to recover the controller.
+ * This happens a lot after PM DMA CS errata.
+ */
+ if (pp->do_port_rst) {
+ ata_port_printk(ap, KERN_WARNING, "controller in dubious "
+ "state, performing PORT_RST\n");
+
+ writel(PORT_CS_PORT_RST, port + PORT_CTRL_STAT);
+ msleep(10);
+ writel(PORT_CS_PORT_RST, port + PORT_CTRL_CLR);
+ ata_wait_register(port + PORT_CTRL_STAT, PORT_CS_RDY, 0,
+ 10, 5000);
+
+ /* restore port configuration */
+ sil24_config_port(port, ap->flags);
+ sil24_config_pmp(ap, ap->nr_pmp_links);
+
+ pp->do_port_rst = 0;
+ did_port_rst = 1;
+ }
+
/* sil24 does the right thing(tm) without any protection */
sata_set_spd(link);
@@ -736,6 +789,11 @@ static int sil24_hardreset(struct ata_li
return -EAGAIN;
err:
+ if (!did_port_rst) {
+ pp->do_port_rst = 1;
+ goto retry;
+ }
+
ata_link_printk(link, KERN_ERR, "hardreset failed (%s)\n", reason);
return -EIO;
}
@@ -1004,6 +1062,7 @@ static void sil24_error_intr(struct ata_
ehi->err_mask |= AC_ERR_OTHER;
ehi->action |= ATA_EH_HARDRESET;
ata_ehi_push_desc(ehi, ", PMP DMA CS errata");
+ pp->do_port_rst = 1;
freeze = 1;
}
@@ -1151,6 +1210,8 @@ static irqreturn_t sil24_interrupt(int i
static void sil24_error_handler(struct ata_port *ap)
{
+ struct sil24_port_priv *pp = ap->private_data;
+
if (sil24_init_port(ap))
ata_eh_freeze_port(ap);
@@ -1159,6 +1220,8 @@ static void sil24_error_handler(struct a
ata_std_postreset, sata_pmp_std_prereset,
sil24_pmp_softreset, sil24_pmp_hardreset,
sata_pmp_std_postreset);
+
+ pp->do_port_rst = 0;
}
static void sil24_post_internal_cmd(struct ata_queued_cmd *qc)
@@ -1272,26 +1335,8 @@ static void sil24_init_controller(struct
"failed to clear port RST\n");
}
- /* Configure IRQ WoC */
- if (port_flags & SIL24_FLAG_PCIX_IRQ_WOC)
- writel(PORT_CS_IRQ_WOC, port + PORT_CTRL_STAT);
- else
- writel(PORT_CS_IRQ_WOC, port + PORT_CTRL_CLR);
-
- /* Zero error counters. */
- writel(0x8000, port + PORT_DECODE_ERR_THRESH);
- writel(0x8000, port + PORT_CRC_ERR_THRESH);
- writel(0x8000, port + PORT_HSHK_ERR_THRESH);
- writel(0x0000, port + PORT_DECODE_ERR_CNT);
- writel(0x0000, port + PORT_CRC_ERR_CNT);
- writel(0x0000, port + PORT_HSHK_ERR_CNT);
-
- /* Always use 64bit activation */
- writel(PORT_CS_32BIT_ACTV, port + PORT_CTRL_CLR);
-
- /* Clear port multiplier enable and resume bits */
- writel(PORT_CS_PMP_EN | PORT_CS_PMP_RESUME,
- port + PORT_CTRL_CLR);
+ /* configure port */
+ sil24_config_port(port, port_flags);
}
/* Turn on interrupts */
--
1.4.2.3
-
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