Re: [PATCH v2 1/2] mtd: rawnand: gpmi: Fix suspend/resume problem

[Han Xu <xhnjupt@xxxxxxxxx>]

On Fri, Jan 17, 2020 at 2:05 PM Esben Haabendal <esben@xxxxxxxxxx> wrote:
>
> On system resume, the gpmi clock must be enabled before accessing gpmi
> block.  Without this, resume causes something like
>
> [  661.348790] gpmi_reset_block(5cbb0f7e): module reset timeout
> [  661.348889] gpmi-nand 1806000.gpmi-nand: Error setting GPMI : -110
> [  661.348928] PM: dpm_run_callback(): platform_pm_resume+0x0/0x44 returns -110
> [  661.348961] PM: Device 1806000.gpmi-nand failed to resume: error -110
>
> Fixes: ef347c0cfd61 ("mtd: rawnand: gpmi: Implement exec_op")
> Cc: stable@xxxxxxxxxxxxxxx
> Signed-off-by: Esben Haabendal <esben@xxxxxxxxxx>
> ---
>  drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c | 7 ++++++-
>  1 file changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c b/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c
> index 334fe3130285..879df8402446 100644
> --- a/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c
> +++ b/drivers/mtd/nand/raw/gpmi-nand/gpmi-nand.c
> @@ -148,6 +148,10 @@ static int gpmi_init(struct gpmi_nand_data *this)
>         struct resources *r = &this->resources;
>         int ret;
>
> +       ret = pm_runtime_get_sync(this->dev);
> +       if (ret < 0)
> +               return ret;
> +
>         ret = gpmi_reset_block(r->gpmi_regs, false);
>         if (ret)
>                 goto err_out;
> @@ -179,8 +183,9 @@ static int gpmi_init(struct gpmi_nand_data *this)
>          */
>         writel(BM_GPMI_CTRL1_DECOUPLE_CS, r->gpmi_regs + HW_GPMI_CTRL1_SET);
>
> -       return 0;
>  err_out:
> +       pm_runtime_mark_last_busy(this->dev);
> +       pm_runtime_put_autosuspend(this->dev);
>         return ret;
>  }
>

Acked-by: Han Xu <han.xu@xxxxxxx>

> --
> 2.25.0
>
>
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-- 
Sincerely,

Han XU

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