Commit 5a73882f authored by York Sun's avatar York Sun Committed by Wolfram Sang
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i2c: mux: reg Change ioread endianness for readback 



Reading the register (if allowed) after writing is to ensure writing
is completed on a posted bus. The endianness of reading doesn't matter.

Signed-off-by: default avatarYork Sun <yorksun@freescale.com>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent a05a34e7

drivers/i2c/muxes/i2c-mux-reg.c

+14 −14
Original line number Diff line number Diff line
@@ -31,28 +31,28 @@ static int i2c_mux_reg_set(const struct regmux *mux, unsigned int chan_id) 
	if (!mux->data.reg)

		return -EINVAL;



	/*

	 * Write to the register, followed by a read to ensure the write is

	 * completed on a "posted" bus, for example PCI or write buffers.

	 * The endianness of reading doesn't matter and the return data

	 * is not used.

	 */

	switch (mux->data.reg_size) {

	case 4:

		if (mux->data.little_endian) {

		if (mux->data.little_endian)

			iowrite32(chan_id, mux->data.reg);

			if (!mux->data.write_only)

				ioread32(mux->data.reg);

		} else {

		else

			iowrite32be(chan_id, mux->data.reg);

		if (!mux->data.write_only)

			ioread32(mux->data.reg);

		}

		break;

	case 2:

		if (mux->data.little_endian) {

		if (mux->data.little_endian)

			iowrite16(chan_id, mux->data.reg);

			if (!mux->data.write_only)

				ioread16(mux->data.reg);

		} else {

		else

			iowrite16be(chan_id, mux->data.reg);

		if (!mux->data.write_only)

				ioread16be(mux->data.reg);

		}

			ioread16(mux->data.reg);

		break;

	case 1:

		iowrite8(chan_id, mux->data.reg);