Commit abf4923e authored by Hsin-Yi Wang's avatar Hsin-Yi Wang Committed by Wolfram Sang

i2c: mediatek: disable zero-length transfers for mt8183

Quoting from mt8183 datasheet, the number of transfers to be
transferred in one transaction should be set to bigger than 1,
so we should forbid zero-length transfer and update functionality.
Reported-by: default avatarAlexandru M Stan <amstan@chromium.org>
Signed-off-by: default avatarHsin-Yi Wang <hsinyi@chromium.org>
Reviewed-by: default avatarQii Wang <qii.wang@mediatek.com>
[wsa: shortened commit message a little]
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent b3d604d4
......@@ -234,6 +234,10 @@ static const struct i2c_adapter_quirks mt7622_i2c_quirks = {
.max_num_msgs = 255,
};
static const struct i2c_adapter_quirks mt8183_i2c_quirks = {
.flags = I2C_AQ_NO_ZERO_LEN,
};
static const struct mtk_i2c_compatible mt2712_compat = {
.regs = mt_i2c_regs_v1,
.pmic_i2c = 0,
......@@ -298,6 +302,7 @@ static const struct mtk_i2c_compatible mt8173_compat = {
};
static const struct mtk_i2c_compatible mt8183_compat = {
.quirks = &mt8183_i2c_quirks,
.regs = mt_i2c_regs_v2,
.pmic_i2c = 0,
.dcm = 0,
......@@ -870,6 +875,10 @@ static irqreturn_t mtk_i2c_irq(int irqno, void *dev_id)
static u32 mtk_i2c_functionality(struct i2c_adapter *adap)
{
if (adap->quirks->flags & I2C_AQ_NO_ZERO_LEN)
return I2C_FUNC_I2C |
(I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK);
else
return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
}
......
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