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    Subject[PATCH AUTOSEL 5.4 186/266] mfd: stmfx: Reset chip on resume as supply was disabled
    Date
    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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