Messages in this thread Patch in this message | | | From | Tim Kryger <> | Subject | [PATCH] mmc: sdhci: Set SDHCI_POWER_ON with external vmmc | Date | Tue, 13 Jan 2015 22:24:12 -0800 |
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Host controllers lacking the required internal vmmc regulator may still follow the spec with regard to the LSB of SDHCI_POWER_CONTROL. Set the SDHCI_POWER_ON bit when vmmc is enabled to encourage the controller to to drive CMD, DAT, SDCLK.
This fixes a regression observed on some Qualcomm and Nvidia boards caused by 5222161 mmc: sdhci: Improve external VDD regulator support.
Signed-off-by: Tim Kryger <tim.kryger@gmail.com> Tested-by: Bjorn Andersson <bjorn.andersson@sonymobile.com> --- drivers/mmc/host/sdhci.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index ada1a3e..59a328a 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -1239,6 +1239,12 @@ static void sdhci_set_power(struct sdhci_host *host, unsigned char mode, spin_unlock_irq(&host->lock); mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd); spin_lock_irq(&host->lock); + + if (mode != MMC_POWER_OFF) + sdhci_writeb(host, SDHCI_POWER_ON, SDHCI_POWER_CONTROL); + else + sdhci_writeb(host, 0, SDHCI_POWER_CONTROL); + return; } -- 1.9.1
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