This fixes a clock imbalance that occurs on Renesas systems because the SD clock is handled by both runtime PM and the hardware driver. After a suspend/resume cycle both enable the same clock, resulting in an enable count of 2 even if the clock is only used by one device.
See https://www.spinics.net/lists/linux-mmc/msg44431.html for details. This patch removes the clock handling from the driver's runtime PM callbacks and turns the clock off after probing if the device has a power domain attached. Reported-by: Geert Uytterhoeven <[email protected]> Signed-off-by: Ulrich Hecht <[email protected]> Tested-by: Niklas Söderlund <[email protected]> --- drivers/mmc/host/tmio_mmc_core.c | 14 +++++++++++--- 1 file changed, 11 insertions(+), 3 deletions(-) diff --git a/drivers/mmc/host/tmio_mmc_core.c b/drivers/mmc/host/tmio_mmc_core.c index 31ffcc3..733ff96 100644 --- a/drivers/mmc/host/tmio_mmc_core.c +++ b/drivers/mmc/host/tmio_mmc_core.c @@ -1260,9 +1260,14 @@ int tmio_mmc_host_probe(struct tmio_mmc_host *_host) /* See if we also get DMA */ tmio_mmc_request_dma(_host, pdata); - pm_runtime_set_active(&pdev->dev); +#ifdef CONFIG_PM + /* PM handles the clock; disable it so it won't be enabled twice. */ + if (_host->clk_disable && pdev->dev.pm_domain) + _host->clk_disable(_host); + pm_runtime_get_sync(&pdev->dev); pm_runtime_set_autosuspend_delay(&pdev->dev, 50); pm_runtime_use_autosuspend(&pdev->dev); +#endif ret = mmc_add_host(mmc); if (ret) @@ -1325,7 +1330,8 @@ int tmio_mmc_host_runtime_suspend(struct device *dev) if (host->clk_cache) host->set_clock(host, 0); - tmio_mmc_clk_disable(host); + if (!dev->pm_domain) + tmio_mmc_clk_disable(host); return 0; } @@ -1340,7 +1346,9 @@ int tmio_mmc_host_runtime_resume(struct device *dev) { struct tmio_mmc_host *host = dev_get_drvdata(dev); - tmio_mmc_clk_enable(host); + if (!dev->pm_domain) + tmio_mmc_clk_enable(host); + tmio_mmc_hw_reset(host->mmc); if (host->clk_cache) -- 2.7.4
