mirror of
https://github.com/torvalds/linux
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70a15e1a3c
At system PM suspend, the tmio core accessed the internal registers of the controller without first moving the device into active state. This caused a lock-up in system PM suspend phase. The reason for the register access were masking of IRQs. Since that is managed via the runtime PM suspend path, let's just re-use that path for system PM suspend. In other words force the device into runtime PM suspend state at system PM suspend and restore it to active state at system PM resume. Reported-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
159 lines
3.5 KiB
C
159 lines
3.5 KiB
C
/*
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* linux/drivers/mmc/host/tmio_mmc.c
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*
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* Copyright (C) 2007 Ian Molton
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* Copyright (C) 2004 Ian Molton
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Driver for the MMC / SD / SDIO cell found in:
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*
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* TC6393XB TC6391XB TC6387XB T7L66XB ASIC3
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*/
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#include <linux/device.h>
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#include <linux/mfd/core.h>
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#include <linux/mfd/tmio.h>
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#include <linux/mmc/host.h>
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#include <linux/module.h>
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#include <linux/pagemap.h>
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#include <linux/scatterlist.h>
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#include "tmio_mmc.h"
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#ifdef CONFIG_PM_SLEEP
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static int tmio_mmc_suspend(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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const struct mfd_cell *cell = mfd_get_cell(pdev);
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int ret;
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ret = pm_runtime_force_suspend(dev);
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/* Tell MFD core it can disable us now.*/
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if (!ret && cell->disable)
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cell->disable(pdev);
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return ret;
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}
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static int tmio_mmc_resume(struct device *dev)
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{
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struct platform_device *pdev = to_platform_device(dev);
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const struct mfd_cell *cell = mfd_get_cell(pdev);
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int ret = 0;
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/* Tell the MFD core we are ready to be enabled */
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if (cell->resume)
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ret = cell->resume(pdev);
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if (!ret)
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ret = pm_runtime_force_resume(dev);
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return ret;
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}
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#endif
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static int tmio_mmc_probe(struct platform_device *pdev)
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{
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const struct mfd_cell *cell = mfd_get_cell(pdev);
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struct tmio_mmc_data *pdata;
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struct tmio_mmc_host *host;
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struct resource *res;
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int ret = -EINVAL, irq;
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if (pdev->num_resources != 2)
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goto out;
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pdata = pdev->dev.platform_data;
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if (!pdata || !pdata->hclk)
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goto out;
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irq = platform_get_irq(pdev, 0);
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if (irq < 0) {
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ret = irq;
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goto out;
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}
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/* Tell the MFD core we are ready to be enabled */
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if (cell->enable) {
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ret = cell->enable(pdev);
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if (ret)
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goto out;
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}
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res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
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if (!res)
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return -EINVAL;
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/* SD control register space size is 0x200, 0x400 for bus_shift=1 */
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pdata->bus_shift = resource_size(res) >> 10;
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pdata->flags |= TMIO_MMC_HAVE_HIGH_REG;
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ret = tmio_mmc_host_probe(&host, pdev, pdata);
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if (ret)
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goto cell_disable;
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ret = request_irq(irq, tmio_mmc_irq, IRQF_TRIGGER_FALLING,
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dev_name(&pdev->dev), host);
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if (ret)
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goto host_remove;
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pr_info("%s at 0x%08lx irq %d\n", mmc_hostname(host->mmc),
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(unsigned long)host->ctl, irq);
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return 0;
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host_remove:
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tmio_mmc_host_remove(host);
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cell_disable:
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if (cell->disable)
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cell->disable(pdev);
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out:
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return ret;
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}
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static int tmio_mmc_remove(struct platform_device *pdev)
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{
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const struct mfd_cell *cell = mfd_get_cell(pdev);
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struct mmc_host *mmc = platform_get_drvdata(pdev);
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if (mmc) {
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struct tmio_mmc_host *host = mmc_priv(mmc);
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free_irq(platform_get_irq(pdev, 0), host);
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tmio_mmc_host_remove(host);
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if (cell->disable)
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cell->disable(pdev);
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}
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return 0;
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}
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/* ------------------- device registration ----------------------- */
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static const struct dev_pm_ops tmio_mmc_dev_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(tmio_mmc_suspend, tmio_mmc_resume)
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SET_PM_RUNTIME_PM_OPS(tmio_mmc_host_runtime_suspend,
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tmio_mmc_host_runtime_resume,
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NULL)
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};
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static struct platform_driver tmio_mmc_driver = {
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.driver = {
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.name = "tmio-mmc",
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.owner = THIS_MODULE,
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.pm = &tmio_mmc_dev_pm_ops,
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},
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.probe = tmio_mmc_probe,
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.remove = tmio_mmc_remove,
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};
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module_platform_driver(tmio_mmc_driver);
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MODULE_DESCRIPTION("Toshiba TMIO SD/MMC driver");
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MODULE_AUTHOR("Ian Molton <spyro@f2s.com>");
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MODULE_LICENSE("GPL v2");
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MODULE_ALIAS("platform:tmio-mmc");
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