From: Mika Westerberg <mika.westerb...@linux.intel.com>
This allows sysfs nodes to read the cached value directly instead of
powering up possibly runtime suspended controller.
Signed-off-by: Mika Westerberg <mika.westerb...@linux.intel.com>
Signed-off-by: Tejun Heo <t...@kernel.org>
(cherry picked from commit 8ea909cb35bc2c3226610f8631c73e355020a26e)
Signed-off-by: Lim Key Seong <key.seong....@intel.com>
---
drivers/ata/ahci.h | 1 +
drivers/ata/libahci.c | 7 +++----
2 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/drivers/ata/ahci.h b/drivers/ata/ahci.h
index f219507..c716700 100644
--- a/drivers/ata/ahci.h
+++ b/drivers/ata/ahci.h
@@ -324,6 +324,7 @@ struct ahci_host_priv {
void __iomem * mmio; /* bus-independent mem map */
u32 cap; /* cap to use */
u32 cap2; /* cap2 to use */
+ u32 version; /* cached version */
u32 port_map; /* port map to use */
u32 saved_cap; /* saved initial cap */
u32 saved_cap2; /* saved initial cap2 */
diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c
index de4fb84..6412a64 100644
--- a/drivers/ata/libahci.c
+++ b/drivers/ata/libahci.c
@@ -249,9 +249,8 @@ static ssize_t ahci_show_host_version(struct device *dev,
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;
- return sprintf(buf, "%x\n", readl(mmio + HOST_VERSION));
+ return sprintf(buf, "%x\n", hpriv->version);
}
static ssize_t ahci_show_port_cmd(struct device *dev,
@@ -507,6 +506,7 @@ void ahci_save_initial_config(struct device *dev, struct
ahci_host_priv *hpriv)
/* record values to use during operation */
hpriv->cap = cap;
hpriv->cap2 = cap2;
+ hpriv->version = readl(mmio + HOST_VERSION);
hpriv->port_map = port_map;
if (!hpriv->start_engine)
@@ -2322,11 +2322,10 @@ static void ahci_port_stop(struct ata_port *ap)
void ahci_print_info(struct ata_host *host, const char *scc_s)
{
struct ahci_host_priv *hpriv = host->private_data;
- void __iomem *mmio = hpriv->mmio;
u32 vers, cap, cap2, impl, speed;
const char *speed_s;
- vers = readl(mmio + HOST_VERSION);
+ vers = hpriv->version;
cap = hpriv->cap;
cap2 = hpriv->cap2;
impl = hpriv->port_map;
--
1.9.1
--
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