On Mon, 28 Jan 2019 at 11:20, Martin Kepplinger <martink@xxxxxxxxx> wrote: > > From: Martin Kepplinger <martin.kepplinger@xxxxxxxxxxxxx> > > This adds support for explicitly switching the mmc's power on and off > which is needed for example for WL1837 wifi controllers. ip link set wlan0 down > doesn't turn off the VMMC regulator which leads to hangs when loading firmware. Isn't there a GPIO that needs to be toggled and separate clk for the WiFi chip that needs to be enabled as well? > > Tested on i.MX28. > > Signed-off-by: Martin Kepplinger <martin.kepplinger@xxxxxxxxxxxxx> > --- > > again, this isn't new. it's (rebased and simplified) > https://patchwork.kernel.org/patch/4365751/ > > Thanks Robin for your input! > > revision history > ---------------- > v1: was just a question why this hasn't gone in earlier. > > > drivers/mmc/host/mxs-mmc.c | 31 +++++++++++++++++++++++-------- > 1 file changed, 23 insertions(+), 8 deletions(-) > > diff --git a/drivers/mmc/host/mxs-mmc.c b/drivers/mmc/host/mxs-mmc.c > index add1e70195ea..fdaca0fcec99 100644 > --- a/drivers/mmc/host/mxs-mmc.c > +++ b/drivers/mmc/host/mxs-mmc.c > @@ -66,11 +66,13 @@ struct mxs_mmc_host { > struct mmc_request *mrq; > struct mmc_command *cmd; > struct mmc_data *data; > + struct regulator *vmmc; You don't need this here as this is already part of the generic struct mmc_host (via the struct mmc_supply). > > unsigned char bus_width; > spinlock_t lock; > int sdio_irq_en; > bool broken_cd; > + unsigned char power_mode; Ditto. > }; > > static int mxs_mmc_get_cd(struct mmc_host *mmc) > @@ -517,6 +519,24 @@ static void mxs_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) > else > host->bus_width = 0; > > + if (host->vmmc && ios->power_mode != host->power_mode) { > + switch (ios->power_mode) { > + case MMC_POWER_OFF: > + if (regulator_disable(host->vmmc)) > + dev_err(mmc_dev(host->mmc), > + "Failed to disable vmmc regulator\n"); You should use mmc_regulator_set_ocr() instead. > + break; > + case MMC_POWER_UP: > + if (regulator_enable(host->vmmc)) Ditto. > + dev_err(mmc_dev(host->mmc), > + "Failed to enable vmmc regulator\n"); > + break; > + default: > + break; > + } > + host->power_mode = ios->power_mode; > + } > + > if (ios->clock) > mxs_ssp_set_clk_rate(&host->ssp, ios->clock); > } > @@ -613,16 +633,11 @@ static int mxs_mmc_probe(struct platform_device *pdev) > > host->mmc = mmc; > host->sdio_irq_en = 0; > + host->power_mode = MMC_POWER_OFF; This isn't needed. The state is already controlled by the mmc core. > > reg_vmmc = devm_regulator_get(&pdev->dev, "vmmc"); You should use mmc_regulator_get_supply() instead. > - 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; > - } > - } > + if (!IS_ERR(reg_vmmc)) > + host->vmmc = reg_vmmc; > > ssp->clk = devm_clk_get(&pdev->dev, NULL); > if (IS_ERR(ssp->clk)) { > -- > 2.20.1 > Kind regards Uffe
