From: Stefan Agner Date: Thu, 5 Jul 2018 12:18:19 +0000 (+0200) Subject: mmc: sdhci: do not try to use 3.3V signaling if not supported X-Git-Url: http://git.rot13.org/?a=commitdiff_plain;h=1b5190c2e74c47ebe4bcecf7a072358ad9f1feaa;p=linux mmc: sdhci: do not try to use 3.3V signaling if not supported For eMMC devices it is valid to only support 1.8V signaling. When vqmmc is set to a fixed 1.8V regulator the stack tries to set 3.3V initially and prints the following warning: mmc1: Switching to 3.3V signalling voltage failed Clear the MMC_SIGNAL_VOLTAGE_330 flag in case 3.3V is signaling is not available. This prevents the stack from even trying to use 3.3V signaling and avoids the above warning. Signed-off-by: Stefan Agner Signed-off-by: Ulf Hansson --- diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 1c828e0e9905..a7b5602ef6f7 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -3734,14 +3734,21 @@ int sdhci_setup_host(struct sdhci_host *host) mmc_gpio_get_cd(host->mmc) < 0) mmc->caps |= MMC_CAP_NEEDS_POLL; - /* If vqmmc regulator and no 1.8V signalling, then there's no UHS */ if (!IS_ERR(mmc->supply.vqmmc)) { ret = regulator_enable(mmc->supply.vqmmc); + + /* If vqmmc provides no 1.8V signalling, then there's no UHS */ if (!regulator_is_supported_voltage(mmc->supply.vqmmc, 1700000, 1950000)) host->caps1 &= ~(SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 | SDHCI_SUPPORT_DDR50); + + /* In eMMC case vqmmc might be a fixed 1.8V regulator */ + if (!regulator_is_supported_voltage(mmc->supply.vqmmc, 2700000, + 3600000)) + host->flags &= ~SDHCI_SIGNALING_330; + if (ret) { pr_warn("%s: Failed to enable vqmmc regulator: %d\n", mmc_hostname(mmc), ret);