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authorKenneth Waters <kwaters@chromium.org>2011-04-25 14:29:54 -0400
committerBen Dooks <ben-linux@fluff.org>2011-05-11 01:45:08 -0400
commit65a1a0ace554d61ea5a90377a54df1505275c1b1 (patch)
treeb66c335b017a0be40ed73a6adf1ea2711f613d6c /drivers
parent9f381a61f58bb6487c93ce2233bb9992f8ea9211 (diff)
i2c: tegra: Enable new slave mode.
For Tegra i2c controller to function properly new slave mode must be enabled. swarren notes: In particular, I found this was needed when working on enabling the Tegra audio driver on the Seaboard board. There are two different PCB layouts for this board; a "clamshell" version, which works just fine without this change, and the original non-clamshell version, which needs this change in order for I2C to operate correctly. Without it, I2C probing fails for some devices, e.g. with: wm8903 0-001a: Device with ID register 0 is not a WM8903 wm8903 0-001a: asoc: failed to probe CODEC wm8903.0-001a: -19 asoc: failed to instantiate card tegra-wm8903: -19 ALSA device list: No soundcards found. Signed-off-by: Rakesh Iyer <riyer@nvidia.com> Cc: stable <stable@kernel.org> Signed-off-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/i2c/busses/i2c-tegra.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-tegra.c b/drivers/i2c/busses/i2c-tegra.c
index b4ab39b741eb..5f1b92c74bd9 100644
--- a/drivers/i2c/busses/i2c-tegra.c
+++ b/drivers/i2c/busses/i2c-tegra.c
@@ -330,6 +330,11 @@ static int tegra_i2c_init(struct tegra_i2c_dev *i2c_dev)
330 i2c_writel(i2c_dev, 0, I2C_INT_MASK); 330 i2c_writel(i2c_dev, 0, I2C_INT_MASK);
331 clk_set_rate(i2c_dev->clk, i2c_dev->bus_clk_rate * 8); 331 clk_set_rate(i2c_dev->clk, i2c_dev->bus_clk_rate * 8);
332 332
333 if (!i2c_dev->is_dvc) {
334 u32 sl_cfg = i2c_readl(i2c_dev, I2C_SL_CNFG);
335 i2c_writel(i2c_dev, sl_cfg | I2C_SL_CNFG_NEWSL, I2C_SL_CNFG);
336 }
337
333 val = 7 << I2C_FIFO_CONTROL_TX_TRIG_SHIFT | 338 val = 7 << I2C_FIFO_CONTROL_TX_TRIG_SHIFT |
334 0 << I2C_FIFO_CONTROL_RX_TRIG_SHIFT; 339 0 << I2C_FIFO_CONTROL_RX_TRIG_SHIFT;
335 i2c_writel(i2c_dev, val, I2C_FIFO_CONTROL); 340 i2c_writel(i2c_dev, val, I2C_FIFO_CONTROL);