From: Daniel Drake Date: Mon, 17 Jun 2013 15:30:36 +0000 (-0400) Subject: i2c-pxa: prepare clock before use X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=7a10f4732972b48f75a547a42f9cdfef340124a6;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git i2c-pxa: prepare clock before use On OLPC XO-1.75 (MMP2), a WARN_ON() was occurring during boot since the clock being enabled by i2c-pxa had not been prepared. Use clk_prepare_enable() to ensure that the prepare operation has taken place, and use clk_disable_unprepare() in the matching shutdown paths. Signed-off-by: Daniel Drake Signed-off-by: Wolfram Sang --- diff --git a/drivers/i2c/busses/i2c-pxa.c b/drivers/i2c/busses/i2c-pxa.c index ea6d45d1dcd6..fbafed29fb81 100644 --- a/drivers/i2c/busses/i2c-pxa.c +++ b/drivers/i2c/busses/i2c-pxa.c @@ -1160,7 +1160,7 @@ static int i2c_pxa_probe(struct platform_device *dev) i2c->adap.class = plat->class; } - clk_enable(i2c->clk); + clk_prepare_enable(i2c->clk); if (i2c->use_pio) { i2c->adap.algo = &i2c_pxa_pio_algorithm; @@ -1202,7 +1202,7 @@ eadapt: if (!i2c->use_pio) free_irq(irq, i2c); ereqirq: - clk_disable(i2c->clk); + clk_disable_unprepare(i2c->clk); iounmap(i2c->reg_base); eremap: clk_put(i2c->clk); @@ -1221,7 +1221,7 @@ static int i2c_pxa_remove(struct platform_device *dev) if (!i2c->use_pio) free_irq(i2c->irq, i2c); - clk_disable(i2c->clk); + clk_disable_unprepare(i2c->clk); clk_put(i2c->clk); iounmap(i2c->reg_base);