From 41a3da2b8e1639d983192e3650670df4ecc94cf7 Mon Sep 17 00:00:00 2001 From: Heikki Krogerus Date: Mon, 18 Apr 2016 15:14:56 +0300 Subject: [PATCH] mfd: intel-lpss: Save register context on suspend All configurations are lost and the registers will have default values when the hardware is suspended and resumed, so saving the private register space context on suspend, and restoring it on resume. Fixes: 4b45efe85263 (mfd: Add support for Intel Sunrisepoint LPSS devices) Cc: stable@vger.kernel.org # v4.3+ Signed-off-by: Heikki Krogerus Signed-off-by: Lee Jones --- drivers/mfd/intel-lpss.c | 19 ++++++++++++++++++- 1 file changed, 18 insertions(+), 1 deletion(-) diff --git a/drivers/mfd/intel-lpss.c b/drivers/mfd/intel-lpss.c index 1bbbe877ba7e..807a3e3ec29a 100644 --- a/drivers/mfd/intel-lpss.c +++ b/drivers/mfd/intel-lpss.c @@ -34,6 +34,7 @@ #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 @@ -76,6 +77,7 @@ struct intel_lpss { struct mfd_cell *cell; struct device *dev; void __iomem *priv; + u32 priv_ctx[LPSS_PRIV_REG_COUNT]; int devid; u32 caps; u32 active_ltr; @@ -493,6 +495,16 @@ 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); @@ -500,8 +512,13 @@ 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; } -- 2.30.2