[PATCH 2/8] mmc: mmci: Decrease current consumption in suspend
From: Ulf Hansson <hidden>
Date: 2012-01-17 14:34:21
Also in:
linux-mmc
Subsystem:
arm primecell mmci pl180/1 driver, multimedia card (mmc), secure digital (sd) and sdio subsystem, the rest · Maintainers:
Russell King, Ulf Hansson, Linus Torvalds
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. Tested-by: Linus Walleij <redacted> Signed-off-by: Ulf Hansson <redacted> Signed-off-by: Linus Walleij <redacted> --- 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 0de2f3d..cd7e144 100644
--- a/drivers/mmc/host/mmci.c
+++ b/drivers/mmc/host/mmci.c@@ -1497,6 +1497,60 @@ 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);
@@ -1504,12 +1558,11 @@ 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); } }
@@ -1523,9 +1576,8 @@ 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);
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1.7.5.4