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mfd: intel-lpss: Save register context on suspend

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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: 4b45efe852 (mfd: Add support for Intel Sunrisepoint LPSS devices)
Cc: stable@vger.kernel.org # v4.3+
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Heikki Krogerus 2016-04-18 15:14:56 +03:00 committed by Lee Jones
parent 0e10d549f6
commit 41a3da2b8e
1 changed files with 18 additions and 1 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

19
drivers/mfd/intel-lpss.c
View file

@ -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;
}