On Wed, Sep 10, 2014 at 08:21:18AM +0200, Markus Pargmann wrote:
On Tue, Sep 09, 2014 at 11:38:05AM -0700, Nicolin Chen wrote:
On Tue, Sep 09, 2014 at 05:18:07PM +0800, Shengjiu Wang wrote:
@@ -1321,7 +1333,11 @@ static int fsl_ssi_probe(struct platform_device *pdev) return -ENOMEM; }
- ssi_private->regs = devm_regmap_init_mmio(&pdev->dev, iomem,
- if (ssi_private->soc->imx)
ssi_private->regs = devm_regmap_init_mmio_clk(&pdev->dev,"ipg", iomem, &fsl_ssi_regconfig);- else
ssi_private->regs = devm_regmap_init_mmio(&pdev->dev, iomem,As Markus mentioned, the key point here is to be compatible with those non-clock-name platforms.
I think it would be safer to keep the current code while adding an extra clk_disable_unprepare() at the end of probe() as a common routine. And meantime, make sure to have the call for imx only because it seems that the other platforms do not depend on the clock. //a bit guessing here :)
Then we can get a patch like: open() {
- clk_prepare_enable(); ....
}
close() { ....
- clk_disable_unprepare()
}
probe() { clk_get(); clk_prepare_enable(); .... if (xxx)
goto err_xx;
return ret;- clk_disable_unprepare(); return 0;
-err_xx:
- clk_disable_unprepare()
}
remove() { ....
- clk_disable_unprepare()
}
If I remember correctly, there may be AC97 communication with the codec before any substream is created. That's why we enable the SSI unit right at the beginning for AC97 in fsl_ssi_setup_reg_vals(). So we need to check for AC97 before disabling clocks.
Thank you for the input. That's the exact part I couldn't be sure. And I agree that adding a check for AC97 will be safer while this may keeps itself removable if being unnecessary.
Thanks Nicolin