imx: mxc_i2c: tweak the i2c transfer method
Tweak the i2c transfer to work for devices that want to read data
without addressing a register.
Signed-off-by: Nandor Han <nandor.han@ge.com>
Signed-off-by: Martyn Welch <martyn.welch@collabora.co.uk>
Acked-by: Heiko Schocher <hs@denx.de>
Cc: Heiko Schocher <hs@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
(cherry picked from commit 2feec4eafd
)
This commit is contained in:
parent
87d4563bbd
commit
4c530ec27c
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@ -317,16 +317,19 @@ static int i2c_init_transfer_(struct mxc_i2c_bus *i2c_bus, u8 chip,
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temp |= I2CR_MTX | I2CR_TX_NO_AK;
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writeb(temp, base + (I2CR << reg_shift));
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/* write slave address */
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ret = tx_byte(i2c_bus, chip << 1);
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if (ret < 0)
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return ret;
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while (alen--) {
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ret = tx_byte(i2c_bus, (addr >> (alen * 8)) & 0xff);
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if (alen >= 0) {
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/* write slave address */
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ret = tx_byte(i2c_bus, chip << 1);
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if (ret < 0)
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return ret;
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while (alen--) {
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ret = tx_byte(i2c_bus, (addr >> (alen * 8)) & 0xff);
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if (ret < 0)
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return ret;
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}
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}
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return 0;
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}
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@ -537,9 +540,11 @@ static int bus_i2c_read(struct mxc_i2c_bus *i2c_bus, u8 chip, u32 addr,
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if (ret < 0)
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return ret;
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temp = readb(base + (I2CR << reg_shift));
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temp |= I2CR_RSTA;
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writeb(temp, base + (I2CR << reg_shift));
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if (alen >= 0) {
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temp = readb(base + (I2CR << reg_shift));
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temp |= I2CR_RSTA;
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writeb(temp, base + (I2CR << reg_shift));
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}
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ret = tx_byte(i2c_bus, (chip << 1) | 1);
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if (ret < 0) {
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