hello John,
the following patch fixes the write protect issue on the AsiaRF FXS
board (AWV002-001 REV .1)
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so the "broken-wp" patch is not required to mount the drive rw once
the pin is grounded.
Not sure if you want to include the broken-wp patch or not in the CC
distribution. It might be useful to others...
Here is hoping you didn't waste too much time on this.
--luis
On 8/24/14, 2:46 AM, Luis Soltero
wrote:
hello john,
thanks for looking into this... just so that you know I forced is_readonly = 0
in sdhci.c as in ...
static int sdhci_check_ro(struct sdhci_host *host)
{
unsigned long flags;
int is_readonly;
spin_lock_irqsave(&host->lock, flags);
if (host->flags & SDHCI_DEVICE_DEAD)
is_readonly = 0;
else if (host->quirks2 & SDHCI_QUIRK2_BROKEN_WRITE_PROTECT)
is_readonly = 0;
else if (host->ops->get_ro)
is_readonly = host->ops->get_ro(host);
else
is_readonly = !(sdhci_readl(host, SDHCI_PRESENT_STATE)
& SDHCI_WRITE_PROTECT);
is_readonly = 0;
spin_unlock_irqrestore(&host->lock, flags);
return 0;
and yet...
root@Optimizer:~# e2fsck /dev/mmcblk0p2
e2fsck 1.42.4 (12-June-2012)
e2fsck: Read-only file system while trying to open /dev/mmcblk0p2
Disk write-protected; use the -n option to do a read-only
check of the device.
so unsure at this time why the driver thinks that this is a read only file system.
look forward to your findings.
--luis
On 8/24/14, 2:07 AM, John Crispin wrote:
Hi Luis,
i have a awm0003 on my desk and will have a look during the week.
John
On 23/08/2014 23:26, Luis Soltero wrote:
Hello All,
Been trying to get an AsiaRF based MT7620a board running using CC
r42230 and having issue getting the MMC SD card reader to mount
rw.
I have been in communication with the manufacturer to discover the
GPIO (if any) used for the WP line for the SDHCI card reader on the
board. They have not gotten back to me. In the mean time I have
attempted to use some of the mmc driver properties such as
wp-inverted to no avail. In desperation I implemented a patch
based on http://permalink.gmane.org/gmane.linux.kernel.mmc/25615
which tells the driver to ignore the write protect line and assume
r/w always... yet the card still mounts read only. note that when
mounting the same SD card using a USB based reader the file system
mounts rw as expected.
here is the mount table showing the ro mount
root@OpenWRT:~# mount rootfs on / type rootfs (rw) snip...
/dev/mmcblk0p2 on /wxa type ext4 (ro,relatime,data=""
here is the DTS definition for the board
sdhci@10130000 { status = "okay"; broken-wp; };
following is the patch (some of you might find it useful). Any
thoughts would greatly be appreciated.
$ cat
target/linux/ramips/patches-3.10/0402-mmc-add-broken-wp.patch ---
a/Documentation/devicetree/bindings/mmc/mmc.txt 2014-08-23
12:39:54.816004290 -0700 +++
b/Documentation/devicetree/bindings/mmc/mmc.txt 2014-08-23
12:40:56.574123135 -0700 @@ -21,6 +21,8 @@ below for the case, when
a GPIO is used for the CD line - wp-inverted: when present,
polarity on the WP line is inverted. See the note below for the
case, when a GPIO is used for the WP line +- broken-wp: when
present, no indication of write protection is available, + and
write protection is assumed always off. - max-frequency: maximum
operating clock frequency - no-1-8-v: when present, denotes that
1.8v card voltage is not supported on this system, even if the
controller claims it is. --- a/drivers/mmc/host/sdhci-pltfm.c
2014-08-23 12:44:02.648454500 -0700 +++
b/drivers/mmc/host/sdhci-pltfm.c 2014-08-23 12:45:52.009124011
-0700 @@ -80,7 +80,9 @@ bus_width == 1)) host->quirks |=
SDHCI_QUIRK_FORCE_1_BIT_DATA;
- if (sdhci_of_wp_inverted(np)) + if
(of_get_property(np, "sdhci,broken-wp", NULL) ||
of_get_property(np, "broken-wp", NULL)) + host->quirks2
|= SDHCI_QUIRK2_BROKEN_WRITE_PROTECT; + else if
(sdhci_of_wp_inverted(np)) host->quirks |=
SDHCI_QUIRK_INVERTED_WRITE_PROTECT;
if (of_get_property(np, "broken-cd", NULL)) ---
a/drivers/mmc/host/sdhci.c 2014-08-23 12:46:10.028575138 -0700
+++ b/drivers/mmc/host/sdhci.c 2014-08-23 12:48:23.588506665
-0700 @@ -1621,6 +1621,8 @@
if (host->flags & SDHCI_DEVICE_DEAD) is_readonly = 0; + else if
(host->quirks2 & SDHCI_QUIRK2_BROKEN_WRITE_PROTECT) +
is_readonly = 0; else if (host->ops->get_ro) is_readonly =
host->ops->get_ro(host); else --- a/include/linux/mmc/sdhci.h
2014-08-23 12:56:38.005445877 -0700 +++ b/include/linux/mmc/sdhci.h
2014-08-23 12:58:58.113178602 -0700 @@ -95,6 +95,8 @@ /* The system
physically doesn't support 1.8v, even if the host does */ #define
SDHCI_QUIRK2_NO_1_8_V (1<<2) #define
SDHCI_QUIRK2_PRESET_VALUE_BROKEN (1<<3) +/* There is no
indication for write protection at all, assume RW */ +#define
SDHCI_QUIRK2_BROKEN_WRITE_PROTECT (1<<4)
int irq; /* Device IRQ */ void __iomem *ioaddr; /* Mapped
address */
--
Luis Soltero, Ph.D., MCS
Director of Software Development, CTO
Global Marine Networks, LLC
StarPilot, LLC
Tel: +1.865.379.8723
Fax: +1.865.681.5017
E-Mail: lsolt...@globalmarinenet.net
Web: http://www.globalmarinenet.net
Web: http://www.redportglobal.com
Web: http://www.starpilotllc.com
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