This patch adds the function to clear pending interrupt before COMRESET.
It follows the AHCI1.3.1 - section6.2.2.2 specification.
Signed-off-by: Szuying Chen <Chloe_Chen@xxxxxxxxxxxxxx>
---modify function name and substitution related behavior.
drivers/ata/libahci.c | 38 ++++++++++++++++++++++++++------------
1 file changed, 26 insertions(+), 12 deletions(-)
diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index 06aec35f88f2..f8ecd9956ea1 100644
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -1256,6 +1256,27 @@ static ssize_t ahci_activity_show(struct ata_device *dev, char *buf)
return sprintf(buf, "%d\n", emp->blink_policy);
}
+static void ahci_port_clear_pending_irq(struct ata_port *ap)
+{
+ struct ahci_host_priv *hpriv = ap->host->private_data;
+ void __iomem *port_mmio = ahci_port_base(ap);
+ u32 tmp;
+
+ /* clear SError */
+ tmp = readl(port_mmio + PORT_SCR_ERR);
+ dev_dbg(ap->host->dev, "PORT_SCR_ERR 0x%x\n", tmp);
+ writel(tmp, port_mmio + PORT_SCR_ERR);
+
+ /* clear port IRQ */
+ tmp = readl(port_mmio + PORT_IRQ_STAT);
+ dev_dbg(ap->host->dev, "PORT_IRQ_STAT 0x%x\n", tmp);
+ if (tmp)
+ writel(tmp, port_mmio + PORT_IRQ_STAT);
+
+ writel(1 << ap->port_no, hpriv->mmio + HOST_IRQ_STAT);
+
+}
+
static void ahci_port_init(struct device *dev, struct ata_port *ap,
int port_no, void __iomem *mmio,
void __iomem *port_mmio)
@@ -1270,18 +1291,8 @@ static void ahci_port_init(struct device *dev, struct ata_port *ap,
if (rc)
dev_warn(dev, "%s (%d)\n", emsg, rc);
- /* clear SError */
- tmp = readl(port_mmio + PORT_SCR_ERR);
- dev_dbg(dev, "PORT_SCR_ERR 0x%x\n", tmp);
- writel(tmp, port_mmio + PORT_SCR_ERR);
-
- /* clear port IRQ */
- tmp = readl(port_mmio + PORT_IRQ_STAT);
- dev_dbg(dev, "PORT_IRQ_STAT 0x%x\n", tmp);
- if (tmp)
- writel(tmp, port_mmio + PORT_IRQ_STAT);
-
- writel(1 << port_no, mmio + HOST_IRQ_STAT);
+ /* clear pending irq */
+ ahci_port_clear_pending_irq(ap);
/* mark esata ports */
tmp = readl(port_mmio + PORT_CMD);
@@ -1602,6 +1613,9 @@ int ahci_do_hardreset(struct ata_link *link, unsigned int *class,
tf.status = ATA_BUSY;
ata_tf_to_fis(&tf, 0, 0, d2h_fis);
+ /* clear pending irq */
+ ahci_port_clear_pending_irq(ap);
+
rc = sata_link_hardreset(link, timing, deadline, online,
ahci_check_ready);
--
2.39.2
