To decrease current consumption in suspend state the
VCORE regulator, the MCLK and PCLK for the ARM PL18x
are now disabled.
When resuming the resourses are re-enabled and
register values for MMCICLOCK, MMCIPOWER and MMCIMASK0
are restored.
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxxxxxx>
---
drivers/mmc/host/mmci.c | 64 ++++++++++++++++++++++++++++++++++++++++++----
1 files changed, 58 insertions(+), 6 deletions(-)
diff --git a/drivers/mmc/host/mmci.c b/drivers/mmc/host/mmci.c
index 8971157..d29b7dc 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c
@@ -1483,6 +1483,60 @@ static int __devexit mmci_remove(struct amba_device *dev)
}
#ifdef CONFIG_SUSPEND
+static int mmci_save(struct amba_device *dev)
+{
+ struct mmc_host *mmc = amba_get_drvdata(dev);
+ unsigned long flags;
+
+ if (mmc) {
+ struct mmci_host *host = mmc_priv(mmc);
+
+ spin_lock_irqsave(&host->lock, flags);
+
+ /*
+ * Make sure we do not get any interrupts when we disabled the
+ * clock and the regulator and as well make sure to clear the
+ * registers for clock and power.
+ */
+ writel(0, host->base + MMCIMASK0);
+ writel(0, host->base + MMCIPOWER);
+ writel(0, host->base + MMCICLOCK);
+
+ spin_unlock_irqrestore(&host->lock, flags);
+
+ clk_unprepare(host->clk);
+ clk_disable(host->clk);
+ amba_vcore_disable(dev);
+ }
+
+ return 0;
+}
+
+static int mmci_restore(struct amba_device *dev)
+{
+ struct mmc_host *mmc = amba_get_drvdata(dev);
+ unsigned long flags;
+
+ if (mmc) {
+ struct mmci_host *host = mmc_priv(mmc);
+
+ amba_vcore_enable(dev);
+ clk_prepare(host->clk);
+ clk_enable(host->clk);
+
+ spin_lock_irqsave(&host->lock, flags);
+
+ /* Restore registers and re-enable interrupts. */
+ writel(host->clk_reg, host->base + MMCICLOCK);
+ writel(host->pwr_reg, host->base + MMCIPOWER);
+ writel(MCI_IRQENABLE, host->base + MMCIMASK0);
+
+ spin_unlock_irqrestore(&host->lock, flags);
+ }
+
+ return 0;
+}
+
static int mmci_suspend(struct device *dev)
{
struct amba_device *adev = to_amba_device(dev);
@@ -1490,12 +1544,11 @@ static int mmci_suspend(struct device *dev)
int ret = 0;
if (mmc) {
- struct mmci_host *host = mmc_priv(mmc);
-
ret = mmc_suspend_host(mmc);
if (ret == 0) {
pm_runtime_get_sync(dev);
- writel(0, host->base + MMCIMASK0);
+ mmci_save(adev);
+ amba_pclk_disable(adev);
}
}
@@ -1509,9 +1562,8 @@ static int mmci_resume(struct device *dev)
int ret = 0;
if (mmc) {
- struct mmci_host *host = mmc_priv(mmc);
-
- writel(MCI_IRQENABLE, host->base + MMCIMASK0);
+ amba_pclk_enable(adev);
+ mmci_restore(adev);
pm_runtime_put(dev);
ret = mmc_resume_host(mmc);
--
1.7.5.4
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