From 8ea909cb35bc2c3226610f8631c73e355020a26e Mon Sep 17 00:00:00 2001 From: Mika Westerberg Date: Thu, 18 Feb 2016 10:54:14 +0200 Subject: [PATCH] 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 Signed-off-by: Tejun Heo --- 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 167ba7e3b92e..70b06bcfb7e3 100644 --- a/drivers/ata/ahci.h +++ b/drivers/ata/ahci.h @@ -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 */ diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c index 513b3fa74d78..8cdf0afd551d 100644 --- a/drivers/ata/libahci.c +++ b/drivers/ata/libahci.c @@ -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;