mirror of https://gitee.com/openkylin/linux.git
mmc: tmio: Make sure the PM domain is 'started' while probing
If the tmio device is attached to a genpd (PM domain), that genpd may have ->start|stop() callback assigned to it. To make sure the device is accessible during ->probe(), genpd's ->start() callback must be invoked, which is currently managed by tmio_mmc_host_probe(). However, it's likely that may be too late for some cases, as registers may be read and written way before that point. To fix the behaviour, let's move the call to dev_pm_domain_start() from tmio_mmc_host_probe() into those clients that needs it. From discussions at linux-mmc mailing list, it turned out that it should be sufficient to do this for the SDHI renesas variants, hence the call is move to renesas_sdhi_probe(). Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Link: https://lore.kernel.org/r/20200519152445.6922-1-ulf.hansson@linaro.org Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
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@ -24,6 +24,7 @@
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#include <linux/module.h>
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#include <linux/of_device.h>
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#include <linux/platform_device.h>
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#include <linux/pm_domain.h>
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#include <linux/mmc/host.h>
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#include <linux/mmc/slot-gpio.h>
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#include <linux/mfd/tmio.h>
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@ -905,6 +906,8 @@ int renesas_sdhi_probe(struct platform_device *pdev,
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/* All SDHI have SDIO status bits which must be 1 */
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mmc_data->flags |= TMIO_MMC_SDIO_STATUS_SETBITS;
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dev_pm_domain_start(&pdev->dev);
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ret = renesas_sdhi_clk_enable(host);
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if (ret)
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goto efree;
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@ -39,7 +39,6 @@
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#include <linux/module.h>
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#include <linux/pagemap.h>
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#include <linux/platform_device.h>
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#include <linux/pm_domain.h>
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#include <linux/pm_qos.h>
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#include <linux/pm_runtime.h>
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#include <linux/regulator/consumer.h>
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@ -1192,7 +1191,6 @@ int tmio_mmc_host_probe(struct tmio_mmc_host *_host)
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/* See if we also get DMA */
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tmio_mmc_request_dma(_host, pdata);
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dev_pm_domain_start(&pdev->dev);
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pm_runtime_get_noresume(&pdev->dev);
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pm_runtime_set_active(&pdev->dev);
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pm_runtime_set_autosuspend_delay(&pdev->dev, 50);
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