blob: 72b03800f4f106dfc9bce7efe960cde65a6e9107 [file] [log] [blame]
From 4b0f8468c79aa3783b5943bad36bf299402e9a18 Mon Sep 17 00:00:00 2001
From: Adrian Hunter <adrian.hunter@intel.com>
Date: Mon, 6 May 2013 12:17:32 +0300
Subject: mmc: sdhci: add ability to stay runtime-resumed if the card is
powered up
If card power is dependent on SD bus power then the host controller
must not be runtime suspended while the card is powered up. Add
the ability to stay runtime-resumed in that case and enable it with a new
quirk SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
(cherry picked from commit f0710a557cb17746b09234f01073a2cdafe4f4a5)
Signed-off-by: Darren Hart <dvhart@linux.intel.com>
---
drivers/mmc/host/sdhci.c | 35 ++++++++++++++++++++++++++++++++++-
include/linux/mmc/sdhci.h | 2 ++
2 files changed, 36 insertions(+), 1 deletion(-)
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -58,6 +58,8 @@ static void sdhci_enable_preset_value(st
#ifdef CONFIG_PM_RUNTIME
static int sdhci_runtime_pm_get(struct sdhci_host *host);
static int sdhci_runtime_pm_put(struct sdhci_host *host);
+static void sdhci_runtime_pm_bus_on(struct sdhci_host *host);
+static void sdhci_runtime_pm_bus_off(struct sdhci_host *host);
#else
static inline int sdhci_runtime_pm_get(struct sdhci_host *host)
{
@@ -67,6 +69,12 @@ static inline int sdhci_runtime_pm_put(s
{
return 0;
}
+static void sdhci_runtime_pm_bus_on(struct sdhci_host *host)
+{
+}
+static void sdhci_runtime_pm_bus_off(struct sdhci_host *host)
+{
+}
#endif
static void sdhci_dumpregs(struct sdhci_host *host)
@@ -192,8 +200,12 @@ static void sdhci_reset(struct sdhci_hos
sdhci_writeb(host, mask, SDHCI_SOFTWARE_RESET);
- if (mask & SDHCI_RESET_ALL)
+ if (mask & SDHCI_RESET_ALL) {
host->clock = 0;
+ /* Reset-all turns off SD Bus Power */
+ if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
+ sdhci_runtime_pm_bus_off(host);
+ }
/* Wait max 100 ms */
timeout = 100;
@@ -1270,6 +1282,8 @@ static int sdhci_set_power(struct sdhci_
if (pwr == 0) {
sdhci_writeb(host, 0, SDHCI_POWER_CONTROL);
+ if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
+ sdhci_runtime_pm_bus_off(host);
return 0;
}
@@ -1291,6 +1305,9 @@ static int sdhci_set_power(struct sdhci_
sdhci_writeb(host, pwr, SDHCI_POWER_CONTROL);
+ if (host->quirks2 & SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON)
+ sdhci_runtime_pm_bus_on(host);
+
/*
* Some controllers need an extra 10ms delay of 10ms before they
* can apply clock after applying power
@@ -2628,6 +2645,22 @@ static int sdhci_runtime_pm_put(struct s
return pm_runtime_put_autosuspend(host->mmc->parent);
}
+static void sdhci_runtime_pm_bus_on(struct sdhci_host *host)
+{
+ if (host->runtime_suspended || host->bus_on)
+ return;
+ host->bus_on = true;
+ pm_runtime_get_noresume(host->mmc->parent);
+}
+
+static void sdhci_runtime_pm_bus_off(struct sdhci_host *host)
+{
+ if (host->runtime_suspended || !host->bus_on)
+ return;
+ host->bus_on = false;
+ pm_runtime_put_noidle(host->mmc->parent);
+}
+
int sdhci_runtime_suspend_host(struct sdhci_host *host)
{
unsigned long flags;
--- a/include/linux/mmc/sdhci.h
+++ b/include/linux/mmc/sdhci.h
@@ -95,6 +95,7 @@ struct sdhci_host {
/* The system physically doesn't support 1.8v, even if the host does */
#define SDHCI_QUIRK2_NO_1_8_V (1<<2)
#define SDHCI_QUIRK2_PRESET_VALUE_BROKEN (1<<3)
+#define SDHCI_QUIRK2_CARD_ON_NEEDS_BUS_ON (1<<4)
int irq; /* Device IRQ */
void __iomem *ioaddr; /* Mapped address */
@@ -139,6 +140,7 @@ struct sdhci_host {
u8 pwr; /* Current voltage */
bool runtime_suspended; /* Host is runtime suspended */
+ bool bus_on; /* Bus power prevents runtime suspend */
struct mmc_request *mrq; /* Current request */
struct mmc_command *cmd; /* Current command */