| Message ID | 1424458639-23330-2-git-send-email-dianders@chromium.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
Dear, Doug. Looks good to me. Thanks! Acked-by: Jaehoon Chung <jh80.chung@samsung.com> Best Regards, Jaehoon Chung On 02/21/2015 03:57 AM, Doug Anderson wrote: > We should give dw_mmc a good reset after we apply power. On some > boards vqmmc may actually be connected to the IP block in the SoC so > it's good to reset after power comes in. > > Without this we sometimes see failures enumerating cards on rk3288. > > Signed-off-by: Doug Anderson <dianders@chromium.org> > --- > drivers/mmc/host/dw_mmc.c | 27 ++++++++++++++++++--------- > 1 file changed, 18 insertions(+), 9 deletions(-) > > diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c > index 43fcae1..6a712ae 100644 > --- a/drivers/mmc/host/dw_mmc.c > +++ b/drivers/mmc/host/dw_mmc.c > @@ -1119,13 +1119,23 @@ static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) > mci_writel(slot->host, PWREN, regs); > break; > case MMC_POWER_ON: > - if (!IS_ERR(mmc->supply.vqmmc) && !slot->host->vqmmc_enabled) { > - ret = regulator_enable(mmc->supply.vqmmc); > - if (ret < 0) > - dev_err(slot->host->dev, > - "failed to enable vqmmc regulator\n"); > - else > + if (!slot->host->vqmmc_enabled) { > + if (!IS_ERR(mmc->supply.vqmmc)) { > + ret = regulator_enable(mmc->supply.vqmmc); > + if (ret < 0) > + dev_err(slot->host->dev, > + "failed to enable vqmmc\n"); > + else > + slot->host->vqmmc_enabled = true; > + > + } else { > + /* Keep track so we don't reset again */ > slot->host->vqmmc_enabled = true; > + } > + > + /* Reset our state machine after powering on */ > + dw_mci_ctrl_reset(slot->host, > + SDMMC_CTRL_ALL_RESET_FLAGS); > } > > /* Adjust clock / bus width after power is up */ > @@ -1139,10 +1149,9 @@ static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) > if (!IS_ERR(mmc->supply.vmmc)) > mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0); > > - if (!IS_ERR(mmc->supply.vqmmc) && slot->host->vqmmc_enabled) { > + if (!IS_ERR(mmc->supply.vqmmc) && slot->host->vqmmc_enabled) > regulator_disable(mmc->supply.vqmmc); > - slot->host->vqmmc_enabled = false; > - } > + slot->host->vqmmc_enabled = false; > > regs = mci_readl(slot->host, PWREN); > regs &= ~(1 << slot->id); > -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Hello Doug, On 02/20/2015 07:57 PM, Doug Anderson wrote: > We should give dw_mmc a good reset after we apply power. On some > boards vqmmc may actually be connected to the IP block in the SoC so > it's good to reset after power comes in. > > Without this we sometimes see failures enumerating cards on rk3288. > > Signed-off-by: Doug Anderson <dianders@chromium.org> On an Exynos5250 Snow, Exynos5420 Peach Pit and Exynos5800 Peach Pi: Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk> Best regards, Javier -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index 43fcae1..6a712ae 100644 --- a/drivers/mmc/host/dw_mmc.c +++ b/drivers/mmc/host/dw_mmc.c @@ -1119,13 +1119,23 @@ static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) mci_writel(slot->host, PWREN, regs); break; case MMC_POWER_ON: - if (!IS_ERR(mmc->supply.vqmmc) && !slot->host->vqmmc_enabled) { - ret = regulator_enable(mmc->supply.vqmmc); - if (ret < 0) - dev_err(slot->host->dev, - "failed to enable vqmmc regulator\n"); - else + if (!slot->host->vqmmc_enabled) { + if (!IS_ERR(mmc->supply.vqmmc)) { + ret = regulator_enable(mmc->supply.vqmmc); + if (ret < 0) + dev_err(slot->host->dev, + "failed to enable vqmmc\n"); + else + slot->host->vqmmc_enabled = true; + + } else { + /* Keep track so we don't reset again */ slot->host->vqmmc_enabled = true; + } + + /* Reset our state machine after powering on */ + dw_mci_ctrl_reset(slot->host, + SDMMC_CTRL_ALL_RESET_FLAGS); } /* Adjust clock / bus width after power is up */ @@ -1139,10 +1149,9 @@ static void dw_mci_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) if (!IS_ERR(mmc->supply.vmmc)) mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0); - if (!IS_ERR(mmc->supply.vqmmc) && slot->host->vqmmc_enabled) { + if (!IS_ERR(mmc->supply.vqmmc) && slot->host->vqmmc_enabled) regulator_disable(mmc->supply.vqmmc); - slot->host->vqmmc_enabled = false; - } + slot->host->vqmmc_enabled = false; regs = mci_readl(slot->host, PWREN); regs &= ~(1 << slot->id);
We should give dw_mmc a good reset after we apply power. On some boards vqmmc may actually be connected to the IP block in the SoC so it's good to reset after power comes in. Without this we sometimes see failures enumerating cards on rk3288. Signed-off-by: Doug Anderson <dianders@chromium.org> --- drivers/mmc/host/dw_mmc.c | 27 ++++++++++++++++++--------- 1 file changed, 18 insertions(+), 9 deletions(-)