[PATCH 1/3] mfd: stmfx: reset chip on resume as supply was disabled

Amelie Delaunay
2020-04-22T09:08:55Z

STMFX supply is disabled during suspend. To avoid a too early access to
the STMFX firmware on resume, reset the chip and wait for its firmware to
be loaded.

Fixes: 06252ade9156 ("mfd: Add ST Multi-Function eXpander (STMFX) core driver")
Signed-off-by: Amelie Delaunay <amelie.delaunay@st.com>
---
drivers/mfd/stmfx.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/drivers/mfd/stmfx.c b/drivers/mfd/stmfx.c
index 857991cb3cbb..fde6541e347c 100644
--- a/drivers/mfd/stmfx.c
+++ b/drivers/mfd/stmfx.c
@@ -501,6 +501,13 @@ static int stmfx_resume(struct device *dev)
}
}

+ /* Reset STMFX - supply has been stopped during suspend */
+ ret = stmfx_chip_reset(stmfx);
+ if (ret) {
+ dev_err(stmfx->dev, "Failed to reset chip: %d\n", ret);
+ return ret;
+ }
+
ret = regmap_raw_write(stmfx->map, STMFX_REG_SYS_CTRL,
&stmfx->bkp_sysctrl, sizeof(stmfx->bkp_sysctrl));
if (ret)
--
2.17.1