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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: Alexandru M Stan <amstan@chromium.org> Signed-off-by: Hsin-Yi Wang <hsinyi@chromium.org> Reviewed-by: Qii Wang <qii.wang@mediatek.com> [wsa: shortened commit message a little] Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
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1 changed files with 10 additions and 1 deletions
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@ -234,6 +234,10 @@ static const struct i2c_adapter_quirks mt7622_i2c_quirks = {
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.max_num_msgs = 255,
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};
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static const struct i2c_adapter_quirks mt8183_i2c_quirks = {
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.flags = I2C_AQ_NO_ZERO_LEN,
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};
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static const struct mtk_i2c_compatible mt2712_compat = {
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.regs = mt_i2c_regs_v1,
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.pmic_i2c = 0,
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@ -298,6 +302,7 @@ static const struct mtk_i2c_compatible mt8173_compat = {
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};
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static const struct mtk_i2c_compatible mt8183_compat = {
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.quirks = &mt8183_i2c_quirks,
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.regs = mt_i2c_regs_v2,
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.pmic_i2c = 0,
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.dcm = 0,
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@ -870,7 +875,11 @@ static irqreturn_t mtk_i2c_irq(int irqno, void *dev_id)
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static u32 mtk_i2c_functionality(struct i2c_adapter *adap)
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{
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return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
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if (adap->quirks->flags & I2C_AQ_NO_ZERO_LEN)
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return I2C_FUNC_I2C |
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(I2C_FUNC_SMBUS_EMUL & ~I2C_FUNC_SMBUS_QUICK);
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else
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return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
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}
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static const struct i2c_algorithm mtk_i2c_algorithm = {
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