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i2c-omap: fix I2C timeouts due to recursive omap_i2c_{un,}idle()

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omap_i2c_unidle() and omap_i2c_idle() are called recursively during
omap_i2c_probe().  This is evidently unexpected and will wipe
out the I2C interrupt enable register the second time that
omap_i2c_idle() is called consecutively.  Any I2C transactions
following a probe of a bus with at least one device on it will then
time out.

Fix by moving omap_i2c_idle() further up in omap_i2c_probe().  Ensure
the I2C controller is marked as idle before the probe starts.  Also
attempt to catch future reappearances of this bug early in development
by warning in omap_i2c_{un,}idle() when they are called recursively.

Problem reported by David Brownell <david-b@pacbell.net>.

Tested on 3430SDP and 2430SDP.

Signed-off-by: Paul Walmsley <paul@pwsan.com>
Cc: David Brownell <david-b@pacbell.net>
Cc: Richard Woodruff <r-woodruff2@ti.com>
Acked-by; Steve Sakoman <steve@sakoman.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
This commit is contained in:
Paul Walmsley 2008-11-21 13:39:47 -08:00 committed by Tony Lindgren
parent c1a473bde4
commit 3831f15441
1 changed files with 7 additions and 2 deletions
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9
drivers/i2c/busses/i2c-omap.c
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@ -191,6 +191,8 @@ static void omap_i2c_put_clocks(struct omap_i2c_dev *dev)
static void omap_i2c_unidle(struct omap_i2c_dev *dev)
{
WARN_ON(!dev->idle);
if (dev->iclk != NULL)
clk_enable(dev->iclk);
clk_enable(dev->fclk);
@ -203,6 +205,8 @@ static void omap_i2c_idle(struct omap_i2c_dev *dev)
{
u16 iv;
WARN_ON(dev->idle);
dev->iestate = omap_i2c_read_reg(dev, OMAP_I2C_IE_REG);
omap_i2c_write_reg(dev, OMAP_I2C_IE_REG, 0);
if (dev->rev1) {
@ -740,6 +744,7 @@ omap_i2c_probe(struct platform_device *pdev)
speed = 100; /* Defualt speed */
dev->speed = speed;
dev->idle = 1;
dev->dev = &pdev->dev;
dev->irq = irq->start;
dev->base = ioremap(mem->start, mem->end - mem->start + 1);
@ -788,6 +793,8 @@ omap_i2c_probe(struct platform_device *pdev)
dev_info(dev->dev, "bus %d rev%d.%d at %d kHz\n",
pdev->id, r >> 4, r & 0xf, dev->speed);
omap_i2c_idle(dev);
adap = &dev->adapter;
i2c_set_adapdata(adap, dev);
adap->owner = THIS_MODULE;
@ -804,8 +811,6 @@ omap_i2c_probe(struct platform_device *pdev)
goto err_free_irq;
}
omap_i2c_idle(dev);
return 0;
err_free_irq: