diff options
Diffstat (limited to 'drivers/mfd/wm8994-core.c')
| -rw-r--r-- | drivers/mfd/wm8994-core.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/mfd/wm8994-core.c b/drivers/mfd/wm8994-core.c index 1e321d34977..f75cdccd104 100644 --- a/drivers/mfd/wm8994-core.c +++ b/drivers/mfd/wm8994-core.c @@ -196,6 +196,7 @@ static int wm8994_suspend(struct device *dev) { struct wm8994 *wm8994 = dev_get_drvdata(dev); int ret; + int gpio_regs[WM8994_NUM_GPIO_REGS]; /* Don't actually go through with the suspend if the CODEC is * still active (eg, for audio passthrough from CP. */ @@ -277,12 +278,24 @@ static int wm8994_suspend(struct device *dev) WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD, WM8994_LDO1ENA_PD | WM8994_LDO2ENA_PD); + /* Save GPIO registers before reset */ + regmap_bulk_read(wm8994->regmap, WM8994_GPIO_1, gpio_regs, + WM8994_NUM_GPIO_REGS); + /* Explicitly put the device into reset in case regulators * don't get disabled in order to ensure consistent restart. */ wm8994_reg_write(wm8994, WM8994_SOFTWARE_RESET, wm8994_reg_read(wm8994, WM8994_SOFTWARE_RESET)); + /* Restore GPIO registers to prevent problems with mismatched + * pin configurations. + */ + ret = regmap_bulk_write(wm8994->regmap, WM8994_GPIO_1, gpio_regs, + WM8994_NUM_GPIO_REGS); + if (ret != 0) + dev_err(dev, "Failed to restore GPIO registers: %d\n", ret); + regcache_cache_only(wm8994->regmap, true); regcache_mark_dirty(wm8994->regmap); |