On Sat, Aug 29, 2015 at 11:17:40AM +0200, Nicholas Mc Guire wrote:
> On Fri, 28 Aug 2015, Han Xu wrote:
>
> > From: Huang Shijie <b32955@xxxxxxxxxxxxx>
> >
> > i.MX6SX supports deep sleep mode(DSM) that may turn off GPMI/BCH power
> > during suspend, add gpmi nand suspend/resume function to release DMA
> > channel in suspend function and re-init GPMI/BCH controller during
> > resume function.
> >
>
> Just a question regarding gpmi_pm_resume() errror reporting
> Is there a reason that the retrun value of gpmi_extra_init() is not checked ?
> gpmi_extra_init() can retrun -ENOMEM or -EINVAL via return enable_edo_mode(),
> while the -EINVAL would produce a dev_err message, -ENOMEM does not so maybe
> this also wants to include a if(ret) {...} ? - something like the below
>
> > Although it is not necessary to restore GPMI/BCH registers value for
> > i.MX6QDL, the code doesn't distinguish different platforms to keep the
> > code simple.
> >
> > Signed-off-by: Huang Shijie <b32955@xxxxxxxxxxxxx>
> > Signed-off-by: Han Xu <han.xu@xxxxxxxxxxxxx>
> > ---
> > drivers/mtd/nand/gpmi-nand/gpmi-nand.c | 45 +++++++++++++++++++++++++++++++++-
> > 1 file changed, 44 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
> > index 1b8f350..dfd0ba1 100644
> > --- a/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
> > +++ b/drivers/mtd/nand/gpmi-nand/gpmi-nand.c
> > @@ -1,7 +1,7 @@
> > /*
> > * Freescale GPMI NAND Flash Driver
> > *
> > - * Copyright (C) 2010-2011 Freescale Semiconductor, Inc.
> > + * Copyright (C) 2010-2015 Freescale Semiconductor, Inc.
> > * Copyright (C) 2008 Embedded Alley Solutions, Inc.
> > *
> > * This program is free software; you can redistribute it and/or modify
> > @@ -2036,9 +2036,52 @@ static int gpmi_nand_remove(struct platform_device *pdev)
> > return 0;
> > }
> >
> > +static int gpmi_pm_suspend(struct device *dev)
> > +{
> > + struct gpmi_nand_data *this = dev_get_drvdata(dev);
> > +
> > + release_dma_channels(this);
> > + return 0;
> > +}
> > +
> > +static int gpmi_pm_resume(struct device *dev)
> > +{
> > + struct gpmi_nand_data *this = dev_get_drvdata(dev);
> > + int ret;
> > +
> > + ret = acquire_dma_channels(this);
> > + if (ret < 0)
> > + return ret;
> > +
> > + /* re-init the GPMI registers */
> > + this->flags &= ~GPMI_TIMING_INIT_OK;
> > + ret = gpmi_init(this);
> > + if (ret) {
> > + dev_err(this->dev, "Error setting GPMI : %d\n", ret);
> > + return ret;
> > + }
> > +
> > + /* re-init the BCH registers */
> > + ret = bch_set_geometry(this);
> > + if (ret) {
> > + dev_err(this->dev, "Error setting BCH : %d\n", ret);
> > + return ret;
> > + }
> > +
> > + /* re-init others */
> > + gpmi_extra_init(this);
>
> report failure of enable_edo_mode() ?
>
> if (ret) {
> dev_err(this->dev, "Error enabling EDO mode : %d\n", ret);
> return ret;
> }
I think it's better that we do not report the failure of the enable_edo_mode() here.
If we do so, the gpmi may cannot work when the enable_edo_mode() fails.
But if we do not report it, the gpmi still can work.
thanks
Huang Shijie
--
To unsubscribe from this list: send the line "unsubscribe dmaengine" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
