Hi Faiz,
On 18/02/20 7:40 pm, Faiz Abbas wrote:
> Add power management ops which save and restore the driver context and
> facilitate a system suspend and resume.
>
> Signed-off-by: Faiz Abbas <faiz_abbas@xxxxxx>
> ---
> drivers/mmc/host/sdhci-omap.c | 59 +++++++++++++++++++++++++++++++++++
> 1 file changed, 59 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci-omap.c b/drivers/mmc/host/sdhci-omap.c
> index 882053151a47..a524c01da8de 100644
> --- a/drivers/mmc/host/sdhci-omap.c
> +++ b/drivers/mmc/host/sdhci-omap.c
> @@ -108,6 +108,11 @@ struct sdhci_omap_host {
> struct pinctrl *pinctrl;
> struct pinctrl_state **pinctrl_state;
> bool is_tuning;
> + /* Omap specific context save */
> + u32 con;
> + u32 hctl;
> + u32 sysctl;
> + u32 capa;
Except CON register which is specific to OMAP, others are SDHCI
registers. Shouldn't the save and restore of these registers be in
sdhci.c? Doesn't set_ios() already take care of configuring HCTL, SYSCTL
etc..?
Thanks
Kishon
> };
>
> static void sdhci_omap_start_clock(struct sdhci_omap_host *omap_host);
> @@ -1233,11 +1238,65 @@ static int sdhci_omap_remove(struct platform_device *pdev)
> return 0;
> }
>
> +static void sdhci_omap_context_save(struct sdhci_omap_host *omap_host)
> +{
> + omap_host->con = sdhci_omap_readl(omap_host, SDHCI_OMAP_CON);
> + omap_host->hctl = sdhci_omap_readl(omap_host, SDHCI_OMAP_HCTL);
> + omap_host->sysctl = sdhci_omap_readl(omap_host, SDHCI_OMAP_SYSCTL);
> + omap_host->capa = sdhci_omap_readl(omap_host, SDHCI_OMAP_CAPA);
> +}
> +
> +static void sdhci_omap_context_restore(struct sdhci_omap_host *omap_host)
> +{
> + sdhci_omap_writel(omap_host, SDHCI_OMAP_CON, omap_host->con);
> + sdhci_omap_writel(omap_host, SDHCI_OMAP_HCTL, omap_host->hctl);
> + sdhci_omap_writel(omap_host, SDHCI_OMAP_SYSCTL, omap_host->sysctl);
> + sdhci_omap_writel(omap_host, SDHCI_OMAP_CAPA, omap_host->capa);
> +}
> +
> +static int __maybe_unused sdhci_omap_suspend(struct device *dev)
> +{
> + struct sdhci_host *host = dev_get_drvdata(dev);
> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> + struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
> +
> + sdhci_suspend_host(host);
> +
> + sdhci_omap_context_save(omap_host);
> +
> + pinctrl_pm_select_idle_state(dev);
> +
> + pm_runtime_put_sync(dev);
> +
> + return 0;
> +}
> +
> +static int __maybe_unused sdhci_omap_resume(struct device *dev)
> +{
> + struct sdhci_host *host = dev_get_drvdata(dev);
> + struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> + struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
> +
> + pm_runtime_get_sync(dev);
> +
> + pinctrl_pm_select_default_state(dev);
> +
> + sdhci_omap_context_restore(omap_host);
> +
> + sdhci_resume_host(host);
> +
> + return 0;
> +}
> +
> +static SIMPLE_DEV_PM_OPS(sdhci_omap_dev_pm_ops, sdhci_omap_suspend,
> + sdhci_omap_resume);
> +
> static struct platform_driver sdhci_omap_driver = {
> .probe = sdhci_omap_probe,
> .remove = sdhci_omap_remove,
> .driver = {
> .name = "sdhci-omap",
> + .pm = &sdhci_omap_dev_pm_ops,
> .of_match_table = omap_sdhci_match,
> },
> };
>
