> -----Original Message-----
> From: linux-mmc-ow...@vger.kernel.org
> [mailto:linux-mmc-ow...@vger.kernel.org] On Behalf Of Rainer Kaluscha
> Sent: Sunday, January 06, 2013 12:20 AM
> To: linux-mmc@vger.kernel.org
> 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 <kl...@marvell.com>
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 <j...@marvell.com>
Signed-off-by: Kevin Liu <kl...@marvell.com>
Tested-by: Marek Szyprowski <m.szyprow...@samsung.com>
Signed-off-by: Chris Ball <c...@laptop.org>
---
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
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