[PATCH] mmc: mediatek: Add system suspend/resume interface

[Ulf Hansson]

On Wed, 18 Nov 2020 at 07:34, Wenbin Mei <wenbin.mei at mediatek.com> wrote:
>
> Before we got these errors on MT8192 platform:
> [   59.153891] Restarting tasks ...
> [   59.154540] done.
> [   59.159175] PM: suspend exit
> [   59.218724] mtk-msdc 11f60000.mmc: phase: [map:fffffffe] [maxlen:31]
> [final:16]
> [  119.776083] mmc0: cqhci: timeout for tag 9
> [  119.780196] mmc0: cqhci: ============ CQHCI REGISTER DUMP ===========
> [  119.786709] mmc0: cqhci: Caps:      0x100020b6 | Version:  0x00000510
> [  119.793225] mmc0: cqhci: Config:    0x00000101 | Control:  0x00000000
> [  119.799706] mmc0: cqhci: Int stat:  0x00000000 | Int enab: 0x00000000
> [  119.806177] mmc0: cqhci: Int sig:   0x00000000 | Int Coal: 0x00000000
> [  119.812670] mmc0: cqhci: TDL base:  0x00000000 | TDL up32: 0x00000000
> [  119.819149] mmc0: cqhci: Doorbell:  0x003ffc00 | TCN:      0x00000200
> [  119.825656] mmc0: cqhci: Dev queue: 0x00000000 | Dev Pend: 0x00000000
> [  119.832155] mmc0: cqhci: Task clr:  0x00000000 | SSC1:     0x00001000
> [  119.838627] mmc0: cqhci: SSC2:      0x00000000 | DCMD rsp: 0x00000000
> [  119.845174] mmc0: cqhci: RED mask:  0xfdf9a080 | TERRI:    0x0000891c
> [  119.851654] mmc0: cqhci: Resp idx:  0x00000000 | Resp arg: 0x00000000
> [  119.865773] mmc0: cqhci: : ===========================================
> [  119.872358] mmc0: running CQE recovery
> From these logs, we found TDL base was back to the default value.
>
> After suspend, the mmc host is powered off by HW, and bring CQE register
> to the default value, so we add system suspend/resume interface, then bring
> CQE to deactivated state before suspend, it will be enabled by CQE first
> request after resume.
>
> Signed-off-by: Wenbin Mei <wenbin.mei at mediatek.com>

I took the liberty of renaming msdc_sys_suspend|resume to
msdc_suspend|resume, as I think the "_sys" is a bit superfluous.

Additionally, I added a fixes+stable tag, then I applied this for fixes, thanks!

Please tell me, if there is anything you would like me to change.

Kind regards
Uffe


> ---
>  drivers/mmc/host/mtk-sd.c | 22 ++++++++++++++++++++--
>  1 file changed, 20 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
> index fc5ee5df91ad..c5f9cd6fc951 100644
> --- a/drivers/mmc/host/mtk-sd.c
> +++ b/drivers/mmc/host/mtk-sd.c
> @@ -2758,11 +2758,29 @@ static int msdc_runtime_resume(struct device *dev)
>         msdc_restore_reg(host);
>         return 0;
>  }
> +
> +static int msdc_sys_suspend(struct device *dev)
> +{
> +       struct mmc_host *mmc = dev_get_drvdata(dev);
> +       int ret;
> +
> +       if (mmc->caps2 & MMC_CAP2_CQE) {
> +               ret = cqhci_suspend(mmc);
> +               if (ret)
> +                       return ret;
> +       }
> +
> +       return pm_runtime_force_suspend(dev);
> +}
> +
> +static int msdc_sys_resume(struct device *dev)
> +{
> +       return pm_runtime_force_resume(dev);
> +}
>  #endif
>
>  static const struct dev_pm_ops msdc_dev_pm_ops = {
> -       SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
> -                               pm_runtime_force_resume)
> +       SET_SYSTEM_SLEEP_PM_OPS(msdc_sys_suspend, msdc_sys_resume)
>         SET_RUNTIME_PM_OPS(msdc_runtime_suspend, msdc_runtime_resume, NULL)
>  };
>
> --
> 2.18.0
>