linux-kernel - [PATCH v2] i2c: tegra: Maintain CPU endianness

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Message-Id: <1421950352-26515-1-git-send-email-digetx@gmail.com>
Date:	Thu, 22 Jan 2015 21:12:21 +0300
From:	Dmitry Osipenko <digetx@...il.com>
To:	digetx@...il.com, Wolfram Sang <wsa@...-dreams.de>,
	Stephen Warren <swarren@...dotorg.org>,
	Thierry Reding <thierry.reding@...il.com>,
	Alexandre Courbot <gnurou@...il.com>,
	Laxman Dewangan <ldewangan@...dia.com>
Cc:	Ben Dooks <ben.dooks@...ethink.co.uk>,
	Bob Mottram <bob.mottram@...ethink.co.uk>,
	linux-tegra@...r.kernel.org, linux-i2c@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2] i2c: tegra: Maintain CPU endianness

Support CPU BE mode by adding endianness conversion for memcpy interactions.

Signed-off-by: Dmitry Osipenko <digetx@...il.com>
---
Changelog:
v2: For consistency cpu_to_le32() changed to le32_to_cpu() because
    i2c_writel() takes BE value in BE CPU mode and value is in LE format.

 drivers/i2c/busses/i2c-tegra.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index 28b87e6..b5afb9f 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -286,6 +286,7 @@ static int tegra_i2c_empty_rx_fifo(struct tegra_i2c_dev *i2c_dev)
 	if (rx_fifo_avail > 0 && buf_remaining > 0) {
 		BUG_ON(buf_remaining > 3);
 		val = i2c_readl(i2c_dev, I2C_RX_FIFO);
+		val = cpu_to_le32(val);
 		memcpy(buf, &val, buf_remaining);
 		buf_remaining = 0;
 		rx_fifo_avail--;
@@ -343,7 +344,9 @@ static int tegra_i2c_fill_tx_fifo(struct tegra_i2c_dev *i2c_dev)
 	 */
 	if (tx_fifo_avail > 0 && buf_remaining > 0) {
 		BUG_ON(buf_remaining > 3);
+		val = 0;
 		memcpy(&val, buf, buf_remaining);
+		val = le32_to_cpu(val);
 
 		/* Again update before writing to FIFO to make sure isr sees. */
 		i2c_dev->msg_buf_remaining = 0;
-- 
2.2.1

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