Merge branches 'acpica', 'aml-custom', 'bugzilla-16548', 'bugzilla-20242', 'd3-cold...

[firefly-linux-kernel-4.4.55.git] / drivers / ata / libahci.c

diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index 26d452339e98f59fc483cbc85e9c53f56b2a0183..d38c40fe4ddbfeace9bb1460505aac4add9d23f1 100644 (file)
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -109,6 +109,8 @@ static ssize_t ahci_read_em_buffer(struct device *dev,
 static ssize_t ahci_store_em_buffer(struct device *dev,
                                    struct device_attribute *attr,
                                    const char *buf, size_t size);
+static ssize_t ahci_show_em_supported(struct device *dev,
+                                     struct device_attribute *attr, char *buf);
 
 static DEVICE_ATTR(ahci_host_caps, S_IRUGO, ahci_show_host_caps, NULL);
 static DEVICE_ATTR(ahci_host_cap2, S_IRUGO, ahci_show_host_cap2, NULL);
@@ -116,6 +118,7 @@ static DEVICE_ATTR(ahci_host_version, S_IRUGO, ahci_show_host_version, NULL);
 static DEVICE_ATTR(ahci_port_cmd, S_IRUGO, ahci_show_port_cmd, NULL);
 static DEVICE_ATTR(em_buffer, S_IWUSR | S_IRUGO,
                   ahci_read_em_buffer, ahci_store_em_buffer);
+static DEVICE_ATTR(em_message_supported, S_IRUGO, ahci_show_em_supported, NULL);
 
 struct device_attribute *ahci_shost_attrs[] = {
        &dev_attr_link_power_management_policy,
@@ -126,6 +129,7 @@ struct device_attribute *ahci_shost_attrs[] = {
        &dev_attr_ahci_host_version,
        &dev_attr_ahci_port_cmd,
        &dev_attr_em_buffer,
+       &dev_attr_em_message_supported,
        NULL
 };
 EXPORT_SYMBOL_GPL(ahci_shost_attrs);
@@ -343,6 +347,24 @@ static ssize_t ahci_store_em_buffer(struct device *dev,
        return size;
 }
 
+static ssize_t ahci_show_em_supported(struct device *dev,
+                                     struct device_attribute *attr, char *buf)
+{
+       struct Scsi_Host *shost = class_to_shost(dev);
+       struct ata_port *ap = ata_shost_to_port(shost);
+       struct ahci_host_priv *hpriv = ap->host->private_data;
+       void __iomem *mmio = hpriv->mmio;
+       u32 em_ctl;
+
+       em_ctl = readl(mmio + HOST_EM_CTL);
+
+       return sprintf(buf, "%s%s%s%s\n",
+                      em_ctl & EM_CTL_LED ? "led " : "",
+                      em_ctl & EM_CTL_SAFTE ? "saf-te " : "",
+                      em_ctl & EM_CTL_SES ? "ses-2 " : "",
+                      em_ctl & EM_CTL_SGPIO ? "sgpio " : "");
+}
+
 /**
  *     ahci_save_initial_config - Save and fixup initial config values
  *     @dev: target AHCI device
@@ -1897,7 +1919,17 @@ static void ahci_pmp_attach(struct ata_port *ap)
        ahci_enable_fbs(ap);
 
        pp->intr_mask |= PORT_IRQ_BAD_PMP;
-       writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
+
+       /*
+        * We must not change the port interrupt mask register if the
+        * port is marked frozen, the value in pp->intr_mask will be
+        * restored later when the port is thawed.
+        *
+        * Note that during initialization, the port is marked as
+        * frozen since the irq handler is not yet registered.
+        */
+       if (!(ap->pflags & ATA_PFLAG_FROZEN))
+               writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
 }
 
 static void ahci_pmp_detach(struct ata_port *ap)
@@ -1913,7 +1945,10 @@ static void ahci_pmp_detach(struct ata_port *ap)
        writel(cmd, port_mmio + PORT_CMD);
 
        pp->intr_mask &= ~PORT_IRQ_BAD_PMP;
-       writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
+
+       /* see comment above in ahci_pmp_attach() */
+       if (!(ap->pflags & ATA_PFLAG_FROZEN))
+               writel(pp->intr_mask, port_mmio + PORT_IRQ_MASK);
 }
 
 int ahci_port_resume(struct ata_port *ap)