Messages in this thread Patch in this message | | | From | Sasha Levin <> | Subject | [PATCH AUTOSEL 5.4 186/266] mfd: stmfx: Reset chip on resume as supply was disabled | Date | Wed, 17 Jun 2020 21:15:11 -0400 |
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From: Amelie Delaunay <amelie.delaunay@st.com>
[ Upstream commit e583649d87ec090444aa5347af0927cd6e8581ae ]
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> Signed-off-by: Lee Jones <lee.jones@linaro.org> Signed-off-by: Sasha Levin <sashal@kernel.org> --- 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) -- 2.25.1
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