From: Martin Kepplinger <[email protected]> This adds support for explicitly switching the mmc's power on and off which is needed for example for WL1837 WL1271 wifi controllers on imx28.
While the wifi's vmmc-supply regulator can be configured in devicetree, "ip link set wlan0 down" doesn't turn off the VMMC regulator which leads to hangs when loading firmware, for example. Signed-off-by: Martin Kepplinger <[email protected]> --- revision history ---------------- v4: re-added forgotten regulator_enable() during probe v3: improve API usage as suggested by Ulf v2: tested patch with changes suggested by Robin v1: question, why https://patchwork.kernel.org/patch/4365751/ didn't get in drivers/mmc/host/mxs-mmc.c | 34 +++++++++++++++++++++++++--------- 1 file changed, 25 insertions(+), 9 deletions(-) diff --git a/drivers/mmc/host/mxs-mmc.c b/drivers/mmc/host/mxs-mmc.c index add1e70195ea..23d275269d61 100644 --- a/drivers/mmc/host/mxs-mmc.c +++ b/drivers/mmc/host/mxs-mmc.c @@ -517,6 +517,22 @@ static void mxs_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) else host->bus_width = 0; + switch (ios->power_mode) { + case MMC_POWER_OFF: + if (!IS_ERR(host->mmc->supply.vmmc)) + mmc_regulator_set_ocr(host->mmc, + host->mmc->supply.vmmc, 0); + break; + case MMC_POWER_UP: + if (!IS_ERR(host->mmc->supply.vmmc)) + mmc_regulator_set_ocr(host->mmc, + host->mmc->supply.vmmc, + ios->vdd); + break; + default: + break; + } + if (ios->clock) mxs_ssp_set_clk_rate(&host->ssp, ios->clock); } @@ -588,7 +604,6 @@ static int mxs_mmc_probe(struct platform_device *pdev) struct mmc_host *mmc; struct resource *iores; int ret = 0, irq_err; - struct regulator *reg_vmmc; struct mxs_ssp *ssp; irq_err = platform_get_irq(pdev, 0); @@ -614,14 +629,15 @@ static int mxs_mmc_probe(struct platform_device *pdev) host->mmc = mmc; host->sdio_irq_en = 0; - reg_vmmc = devm_regulator_get(&pdev->dev, "vmmc"); - if (!IS_ERR(reg_vmmc)) { - ret = regulator_enable(reg_vmmc); - if (ret) { - dev_err(&pdev->dev, - "Failed to enable vmmc regulator: %d\n", ret); - goto out_mmc_free; - } + ret = mmc_regulator_get_supply(mmc); + if (ret == -EPROBE_DEFER) + goto out_mmc_free; + + ret = regulator_enable(mmc->supply.vmmc); + if (ret) { + dev_err(&pdev->dev, + "Failed to enable vmmc regulator: %d\n", ret); + goto out_mmc_free; } ssp->clk = devm_clk_get(&pdev->dev, NULL); -- 2.20.1
