> -----Original Message----- > From: linux-mmc-owner@xxxxxxxxxxxxxxx [mailto:linux-mmc-owner@xxxxxxxxxxxxxxx] On Behalf Of Rainer Kaluscha > Sent: Sunday, January 06, 2013 12:20 AM > To: linux-mmc@xxxxxxxxxxxxxxx > Subject: SD card reader stopped working in kernel 3.6: CONFIG_REGULATOR troubles (solved) > > My SD card reader which worked fine with kernel 3.5 stopped working with kernel > 3.6 and 3.7. It is a "SD Host controller: Ricoh Co Ltd R5C822 > SD/SDIO/MMC/MS/MSPro Host Adapter (rev 22)", PCI-ID 0e:06.1 > > I finally noticed messages like "mmc0: Hardware doesn't report any support > voltages." so I tried disabling CONFIG_REGULATOR in kernel config which solved > the issue. > > Maybe this is also of interest to others. Feel free to contact me if you need > more details. > > Can you try below patch? or you can try with latest 3.8 kernel which has integrated the patch. >From cec2e216f72c6b5ccdadb60aadbe99821d744503 Mon Sep 17 00:00:00 2001 From: Kevin Liu <kliu5@xxxxxxxxxxx> Date: Tue, 20 Nov 2012 08:24:32 -0500 Subject: [PATCH] mmc: sdhci: Use regulator min/max voltage range according to spec For regulator vmmc/vmmcq, use voltage range as below 3.3v/3.0v: (2.7v, 3.6v) 1.8v: (1.7v, 1.95v) Original code uses the precise value which may fail in regulator driver if it does NOT support the precise voltage. Signed-off-by: Jialing Fu <jlfu@xxxxxxxxxxx> Signed-off-by: Kevin Liu <kliu5@xxxxxxxxxxx> Tested-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> Signed-off-by: Chris Ball <cjb@xxxxxxxxxx> --- drivers/mmc/host/sdhci.c | 18 ++++++++---------- 1 file changed, 8 insertions(+), 10 deletions(-) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 2f62fe4..ec3e984 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -1618,7 +1618,7 @@ static int sdhci_do_3_3v_signal_voltage_switch(struct sdhci_host *host, sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2); if (host->vqmmc) { - ret = regulator_set_voltage(host->vqmmc, 3300000, 3300000); + ret = regulator_set_voltage(host->vqmmc, 2700000, 3600000); if (ret) { pr_warning("%s: Switching to 3.3V signalling voltage " " failed\n", mmc_hostname(host->mmc)); @@ -1662,7 +1662,7 @@ static int sdhci_do_1_8v_signal_voltage_switch(struct sdhci_host *host, */ if (host->vqmmc) ret = regulator_set_voltage(host->vqmmc, - 1800000, 1800000); + 1700000, 1950000); else ret = 0; @@ -2860,8 +2860,8 @@ int sdhci_add_host(struct sdhci_host *host) } } else { regulator_enable(host->vqmmc); - if (!regulator_is_supported_voltage(host->vqmmc, 1800000, - 1800000)) + if (!regulator_is_supported_voltage(host->vqmmc, 1700000, + 1950000)) caps[1] &= ~(SDHCI_SUPPORT_SDR104 | SDHCI_SUPPORT_SDR50 | SDHCI_SUPPORT_DDR50); @@ -2925,16 +2925,14 @@ int sdhci_add_host(struct sdhci_host *host) #ifdef CONFIG_REGULATOR if (host->vmmc) { - ret = regulator_is_supported_voltage(host->vmmc, 3300000, - 3300000); + ret = regulator_is_supported_voltage(host->vmmc, 2700000, + 3600000); if ((ret <= 0) || (!(caps[0] & SDHCI_CAN_VDD_330))) caps[0] &= ~SDHCI_CAN_VDD_330; - ret = regulator_is_supported_voltage(host->vmmc, 3000000, - 3000000); if ((ret <= 0) || (!(caps[0] & SDHCI_CAN_VDD_300))) caps[0] &= ~SDHCI_CAN_VDD_300; - ret = regulator_is_supported_voltage(host->vmmc, 1800000, - 1800000); + ret = regulator_is_supported_voltage(host->vmmc, 1700000, + 1950000); if ((ret <= 0) || (!(caps[0] & SDHCI_CAN_VDD_180))) caps[0] &= ~SDHCI_CAN_VDD_180; } -- 1.7.9.5 Thanks Kevin -- To unsubscribe from this list: send the line "unsubscribe linux-mmc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
