diff options
Diffstat (limited to 'drivers/mfd/intel-lpss.c')
| -rw-r--r-- | drivers/mfd/intel-lpss.c | 19 |
1 files changed, 18 insertions, 1 deletions
diff --git a/drivers/mfd/intel-lpss.c b/drivers/mfd/intel-lpss.c index 68aa31ae553a..88e80ec772f6 100644 --- a/drivers/mfd/intel-lpss.c +++ b/drivers/mfd/intel-lpss.c @@ -33,6 +33,7 @@ #define LPSS_DEV_SIZE 0x200 #define LPSS_PRIV_OFFSET 0x200 #define LPSS_PRIV_SIZE 0x100 +#define LPSS_PRIV_REG_COUNT (LPSS_PRIV_SIZE / 4) #define LPSS_IDMA64_OFFSET 0x800 #define LPSS_IDMA64_SIZE 0x800 @@ -75,6 +76,7 @@ struct intel_lpss { const struct mfd_cell *cell; struct device *dev; void __iomem *priv; + u32 priv_ctx[LPSS_PRIV_REG_COUNT]; int devid; u32 caps; u32 active_ltr; @@ -485,6 +487,16 @@ EXPORT_SYMBOL_GPL(intel_lpss_prepare); int intel_lpss_suspend(struct device *dev) { + struct intel_lpss *lpss = dev_get_drvdata(dev); + unsigned int i; + + /* Save device context */ + for (i = 0; i < LPSS_PRIV_REG_COUNT; i++) + lpss->priv_ctx[i] = readl(lpss->priv + i * 4); + + /* Put the device into reset state */ + writel(0, lpss->priv + LPSS_PRIV_RESETS); + return 0; } EXPORT_SYMBOL_GPL(intel_lpss_suspend); @@ -492,8 +504,13 @@ EXPORT_SYMBOL_GPL(intel_lpss_suspend); int intel_lpss_resume(struct device *dev) { struct intel_lpss *lpss = dev_get_drvdata(dev); + unsigned int i; - intel_lpss_init_dev(lpss); + intel_lpss_deassert_reset(lpss); + + /* Restore device context */ + for (i = 0; i < LPSS_PRIV_REG_COUNT; i++) + writel(lpss->priv_ctx[i], lpss->priv + i * 4); return 0; } |