On Fri, 24 Oct 2014, Dmitry Eremin-Solenikov wrote:
> Some boards with TC6393XB chip require full state restore during system
> resume thanks to chip's VCC being cut off during suspend (Sharp SL-6000
> tosa is one of them). Failing to do so would result in ohci Oops on
> resume due to internal memory contentes being changed. Fail ohci suspend
> on tc6393xb is full state restore is required.
>
> Recommended workaround is to unbind tmio-ohci driver before suspend and
> rebind it after resume.
>
> Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@xxxxxxxxx>
> Cc: stable@xxxxxxxxxxxxxxx
> ---
> drivers/mfd/tc6393xb.c | 13 ++++++++++++-
> 1 file changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mfd/tc6393xb.c b/drivers/mfd/tc6393xb.c
> index 11c19e5..48579e5 100644
> --- a/drivers/mfd/tc6393xb.c
> +++ b/drivers/mfd/tc6393xb.c
> @@ -263,6 +263,17 @@ static int tc6393xb_ohci_disable(struct platform_device *dev)
> return 0;
> }
>
> +static int tc6393xb_ohci_suspend(struct platform_device *dev)
> +{
> + struct tc6393xb_platform_data *tcpd = dev_get_platdata(dev->dev.parent);
> +
> + /* We can't properly store/restore OHCI state, so fail here */
> + if (tcpd->resume_restore)
> + return -EBUSY;
Wouldn't it be easier to just put these three lines into
tc6393xb_ohci_disable() instead off adding 7 superfluous lines and
making the Ops names inconsistent?
> + return tc6393xb_ohci_disable(dev);
> +}
> +
> static int tc6393xb_fb_enable(struct platform_device *dev)
> {
> struct tc6393xb *tc6393xb = dev_get_drvdata(dev->dev.parent);
> @@ -403,7 +414,7 @@ static struct mfd_cell tc6393xb_cells[] = {
> .num_resources = ARRAY_SIZE(tc6393xb_ohci_resources),
> .resources = tc6393xb_ohci_resources,
> .enable = tc6393xb_ohci_enable,
> - .suspend = tc6393xb_ohci_disable,
> + .suspend = tc6393xb_ohci_suspend,
> .resume = tc6393xb_ohci_enable,
> .disable = tc6393xb_ohci_disable,
> },
--
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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