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Message-ID: <ec385fc0-a17e-7ee4-2414-be9de131ecdc@intel.com>
Date: Mon, 14 Aug 2017 13:28:34 +0300
From: Adrian Hunter <adrian.hunter@...el.com>
To: Masahiro Yamada <yamada.masahiro@...ionext.com>,
linux-mmc@...r.kernel.org
Cc: Piotr Sroka <piotrs@...ence.com>, Al Cooper <alcooperx@...il.com>,
linux-kernel@...r.kernel.org,
Brian Norris <computersforpeace@...il.com>,
bcm-kernel-feedback-list@...adcom.com,
Barry Song <baohua@...nel.org>,
Florian Fainelli <f.fainelli@...il.com>,
Gregory Fong <gregory.0xf0@...il.com>,
linux-arm-kernel@...ts.infradead.org,
Ulf Hansson <ulf.hansson@...aro.org>
Subject: Re: [PATCH v2 1/4] mmc: sdhci: enable/disable the clock in
sdhci_pltfm_suspend/resume
On 03/08/17 04:44, Masahiro Yamada wrote:
> This commit provides similar cleanups as commit 83eacdfa2529 ("mmc:
> sdhci: disable the clock in sdhci_pltfm_unregister()") did for
> unregister hooks.
>
> Some drivers duplicate code to handle pltfm_host->clk in their own
> hooks. The clock can be handled in sdhci_pltfm.c so that drivers
> can reuse sdhci_pltfm_pmops.
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@...ionext.com>
I would like to see some Acks from other driver maintainers including ones
that did not previously clk_disable_unprepare(pltfm_host->clk) in suspend
but now do. e.g. sdhci-tegra
> ---
>
> Changes in v2:
> - Fix build error reported by kbuild test robot
>
> drivers/mmc/host/sdhci-brcmstb.c | 37 +------------------------------------
> drivers/mmc/host/sdhci-pltfm.c | 16 +++++++++++++++-
> drivers/mmc/host/sdhci-sirf.c | 39 +--------------------------------------
> 3 files changed, 17 insertions(+), 75 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..be9a79d62e22 100644
> --- a/drivers/mmc/host/sdhci-pltfm.c
> +++ b/drivers/mmc/host/sdhci-pltfm.c
> @@ -212,16 +212,30 @@ 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);
> }
> 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,
>
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