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mmc: dw_mmc: Give a good reset after we give power

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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>
Tested-by: Javier Martinez Canillas <javier.martinez@collabora.co.uk>
Signed-off-by: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Doug Anderson 2015-02-20 10:57:19 -08:00 committed by Ulf Hansson
parent 655babbde6
commit d1f1dd8600
1 changed files with 18 additions and 9 deletions
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27
drivers/mmc/host/dw_mmc.c
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@ -1120,13 +1120,23 @@ 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 */
@ -1140,10 +1150,9 @@ 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);