Re: [PATCH v4 3/4] mmc: sdhci: enable/disable the clock in sdhci_pltfm_suspend/resume

[Adrian Hunter]

On 23/08/17 07:15, Masahiro Yamada wrote:
> This commit provides similar cleanups as commit 83eacdfa2529 ("mmc:
> sdhci: disable the clock in sdhci_pltfm_unregister()") did for
> unregister hooks.
> 
> sdhci-brcmstb.c and sdhci-sirf.c implement their own suspend/resume
> hooks to handle pltfm_host->clk.  Move clock handling to sdhci_pltfm.c
> so that the drivers can reuse sdhci_pltfm_pmops.
> 
> The following drivers did not previously touch pltfm_host->clk during
> suspend/resume, but now do:
>   - sdhci-bcm-kona.c
>   - sdhci-dove.c
>   - sdhci-iproc.c
>   - sdhci-pxav2.c
>   - sdhci-tegra.c
>   - sdhci-xenon.c
> 
> Signed-off-by: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>

Would have been nice to see some more Acks on this but from sdhci point of view:

Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>

> ---
> 
> Changes in v4:
>   - Disable clk when resume fails
> 
> Changes in v3: None
> Changes in v2:
>   - Fix build error reported by kbuild test robot
> 
>  drivers/mmc/host/sdhci-brcmstb.c | 37 +------------------------------------
>  drivers/mmc/host/sdhci-pltfm.c   | 22 ++++++++++++++++++++--
>  drivers/mmc/host/sdhci-sirf.c    | 39 +--------------------------------------
>  3 files changed, 22 insertions(+), 76 deletions(-)
> 
> diff --git a/drivers/mmc/host/sdhci-brcmstb.c b/drivers/mmc/host/sdhci-brcmstb.c
> index e2f638338e8f..6d461fcdd663 100644
> --- a/drivers/mmc/host/sdhci-brcmstb.c
> +++ b/drivers/mmc/host/sdhci-brcmstb.c
> @@ -21,41 +21,6 @@
>  
>  #include "sdhci-pltfm.h"
>  
> -#ifdef CONFIG_PM_SLEEP
> -
> -static int sdhci_brcmstb_suspend(struct device *dev)
> -{
> -	struct sdhci_host *host = dev_get_drvdata(dev);
> -	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> -	int res;
> -
> -	if (host->tuning_mode != SDHCI_TUNING_MODE_3)
> -		mmc_retune_needed(host->mmc);
> -
> -	res = sdhci_suspend_host(host);
> -	if (res)
> -		return res;
> -	clk_disable_unprepare(pltfm_host->clk);
> -	return res;
> -}
> -
> -static int sdhci_brcmstb_resume(struct device *dev)
> -{
> -	struct sdhci_host *host = dev_get_drvdata(dev);
> -	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> -	int err;
> -
> -	err = clk_prepare_enable(pltfm_host->clk);
> -	if (err)
> -		return err;
> -	return sdhci_resume_host(host);
> -}
> -
> -#endif /* CONFIG_PM_SLEEP */
> -
> -static SIMPLE_DEV_PM_OPS(sdhci_brcmstb_pmops, sdhci_brcmstb_suspend,
> -			sdhci_brcmstb_resume);
> -
>  static const struct sdhci_ops sdhci_brcmstb_ops = {
>  	.set_clock = sdhci_set_clock,
>  	.set_bus_width = sdhci_set_bus_width,
> @@ -131,7 +96,7 @@ MODULE_DEVICE_TABLE(of, sdhci_brcm_of_match);
>  static struct platform_driver sdhci_brcmstb_driver = {
>  	.driver		= {
>  		.name	= "sdhci-brcmstb",
> -		.pm	= &sdhci_brcmstb_pmops,
> +		.pm	= &sdhci_pltfm_pmops,
>  		.of_match_table = of_match_ptr(sdhci_brcm_of_match),
>  	},
>  	.probe		= sdhci_brcmstb_probe,
> diff --git a/drivers/mmc/host/sdhci-pltfm.c b/drivers/mmc/host/sdhci-pltfm.c
> index e090d8c42ddb..4c0135e184e9 100644
> --- a/drivers/mmc/host/sdhci-pltfm.c
> +++ b/drivers/mmc/host/sdhci-pltfm.c
> @@ -212,18 +212,36 @@ EXPORT_SYMBOL_GPL(sdhci_pltfm_unregister);
>  static int sdhci_pltfm_suspend(struct device *dev)
>  {
>  	struct sdhci_host *host = dev_get_drvdata(dev);
> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +	int ret;
>  
>  	if (host->tuning_mode != SDHCI_TUNING_MODE_3)
>  		mmc_retune_needed(host->mmc);
>  
> -	return sdhci_suspend_host(host);
> +	ret = sdhci_suspend_host(host);
> +	if (ret)
> +		return ret;
> +
> +	clk_disable_unprepare(pltfm_host->clk);
> +
> +	return 0;
>  }
>  
>  static int sdhci_pltfm_resume(struct device *dev)
>  {
>  	struct sdhci_host *host = dev_get_drvdata(dev);
> +	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> +	int ret;
> +
> +	ret = clk_prepare_enable(pltfm_host->clk);
> +	if (ret)
> +		return ret;
>  
> -	return sdhci_resume_host(host);
> +	ret = sdhci_resume_host(host);
> +	if (ret)
> +		clk_disable_unprepare(pltfm_host->clk);
> +
> +	return ret;
>  }
>  #endif
>  
> diff --git a/drivers/mmc/host/sdhci-sirf.c b/drivers/mmc/host/sdhci-sirf.c
> index c251c6c0a112..0c7aa89df4e2 100644
> --- a/drivers/mmc/host/sdhci-sirf.c
> +++ b/drivers/mmc/host/sdhci-sirf.c
> @@ -230,43 +230,6 @@ static int sdhci_sirf_probe(struct platform_device *pdev)
>  	return ret;
>  }
>  
> -#ifdef CONFIG_PM_SLEEP
> -static int sdhci_sirf_suspend(struct device *dev)
> -{
> -	struct sdhci_host *host = dev_get_drvdata(dev);
> -	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> -	int ret;
> -
> -	if (host->tuning_mode != SDHCI_TUNING_MODE_3)
> -		mmc_retune_needed(host->mmc);
> -
> -	ret = sdhci_suspend_host(host);
> -	if (ret)
> -		return ret;
> -
> -	clk_disable(pltfm_host->clk);
> -
> -	return 0;
> -}
> -
> -static int sdhci_sirf_resume(struct device *dev)
> -{
> -	struct sdhci_host *host = dev_get_drvdata(dev);
> -	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
> -	int ret;
> -
> -	ret = clk_enable(pltfm_host->clk);
> -	if (ret) {
> -		dev_dbg(dev, "Resume: Error enabling clock\n");
> -		return ret;
> -	}
> -
> -	return sdhci_resume_host(host);
> -}
> -#endif
> -
> -static SIMPLE_DEV_PM_OPS(sdhci_sirf_pm_ops, sdhci_sirf_suspend, sdhci_sirf_resume);
> -
>  static const struct of_device_id sdhci_sirf_of_match[] = {
>  	{ .compatible = "sirf,prima2-sdhc" },
>  	{ }
> @@ -277,7 +240,7 @@ static struct platform_driver sdhci_sirf_driver = {
>  	.driver		= {
>  		.name	= "sdhci-sirf",
>  		.of_match_table = sdhci_sirf_of_match,
> -		.pm	= &sdhci_sirf_pm_ops,
> +		.pm	= &sdhci_pltfm_pmops,
>  	},
>  	.probe		= sdhci_sirf_probe,
>  	.remove		= sdhci_pltfm_unregister,
>