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ahci: Cache host controller version 

This allows sysfs nodes to read the cached value directly instead of
powering up possibly runtime suspended controller.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Mika Westerberg 2016-02-18 10:54:14 +02:00 committed by Tejun Heo
parent 5c6fab9d55
commit 8ea909cb35
2 changed files with 4 additions and 4 deletions
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1
drivers/ata/ahci.h
View File

@ -335,6 +335,7 @@ 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 */

7
drivers/ata/libahci.c
View File

@ -251,9 +251,8 @@ 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,
@ -509,6 +508,7 @@ 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)
@ -2357,11 +2357,10 @@ 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;