The patch titled
omap_hsmmc: protect the card when the cover is open
has been added to the -mm tree. Its filename is
omap_hsmmc-protect-the-card-when-the-cover-is-open.patch
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------------------------------------------------------
Subject: omap_hsmmc: protect the card when the cover is open
From: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Depending on the manufacturer, there is a small possibility that removing
a card while it is being written to, can render the card permanently
unusable. To prevent that, the card is made inaccessible when the cover
is open.
Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Matt Fleming <matt@xxxxxxxxxxxxxxxxx>
Cc: Ian Molton <ian@xxxxxxxxxxxxxx>
Cc: "Roberto A. Foglietta" <roberto.foglietta@xxxxxxxxx>
Cc: Jarkko Lavinen <jarkko.lavinen@xxxxxxxxx>
Cc: Denis Karpov <ext-denis.2.karpov@xxxxxxxxx>
Cc: Pierre Ossman <pierre@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/host/omap_hsmmc.c | 63 ++++++++++++++++++++++++++++++--
1 file changed, 61 insertions(+), 2 deletions(-)
diff -puN drivers/mmc/host/omap_hsmmc.c~omap_hsmmc-protect-the-card-when-the-cover-is-open drivers/mmc/host/omap_hsmmc.c
--- a/drivers/mmc/host/omap_hsmmc.c~omap_hsmmc-protect-the-card-when-the-cover-is-open
+++ a/drivers/mmc/host/omap_hsmmc.c
@@ -165,6 +165,8 @@ struct omap_hsmmc_host {
int context_loss;
int dpm_state;
int vdd;
+ int protect_card;
+ int reqs_blocked;
struct omap_mmc_platform_data *pdata;
};
@@ -349,6 +351,9 @@ static void send_init_stream(struct omap
int reg = 0;
unsigned long timeout;
+ if (host->protect_card)
+ return;
+
disable_irq(host->irq);
OMAP_HSMMC_WRITE(host->base, CON,
OMAP_HSMMC_READ(host->base, CON) | INIT_STREAM);
@@ -778,6 +783,30 @@ err:
return ret;
}
+/* Protect the card while the cover is open */
+static void omap_hsmmc_protect_card(struct omap_hsmmc_host *host)
+{
+ if (!mmc_slot(host).get_cover_state)
+ return;
+
+ host->reqs_blocked = 0;
+ if (mmc_slot(host).get_cover_state(host->dev, host->slot_id)) {
+ if (host->protect_card) {
+ printk(KERN_INFO "%s: cover is closed, "
+ "card is now accessible\n",
+ mmc_hostname(host->mmc));
+ host->protect_card = 0;
+ }
+ } else {
+ if (!host->protect_card) {
+ printk(KERN_INFO "%s: cover is open, "
+ "card is now inaccessible\n",
+ mmc_hostname(host->mmc));
+ host->protect_card = 1;
+ }
+ }
+}
+
/*
* Work Item to notify the core about card insertion/removal
*/
@@ -795,8 +824,10 @@ static void omap_hsmmc_detect(struct wor
if (slot->card_detect)
carddetect = slot->card_detect(slot->card_detect_irq);
- else
+ else {
+ omap_hsmmc_protect_card(host);
carddetect = -ENOSYS;
+ }
if (carddetect) {
mmc_detect_change(host->mmc, (HZ * 200) / 1000);
@@ -1032,8 +1063,32 @@ static void omap_hsmmc_request(struct mm
* interrupts, but not if we are already in interrupt context i.e.
* retries.
*/
- if (!in_interrupt())
+ if (!in_interrupt()) {
disable_irq(host->irq);
+ /*
+ * Protect the card from I/O if there is a possibility
+ * it can be removed.
+ */
+ if (host->protect_card) {
+ if (host->reqs_blocked < 3) {
+ /*
+ * Ensure the controller is left in a consistent
+ * state by resetting the command and data state
+ * machines.
+ */
+ omap_hsmmc_reset_controller_fsm(host, SRD);
+ omap_hsmmc_reset_controller_fsm(host, SRC);
+ host->reqs_blocked += 1;
+ }
+ req->cmd->error = -EBADF;
+ if (req->data)
+ req->data->error = -EBADF;
+ enable_irq(host->irq);
+ mmc_request_done(mmc, req);
+ return;
+ } else if (host->reqs_blocked)
+ host->reqs_blocked = 0;
+ }
WARN_ON(host->mrq != NULL);
host->mrq = req;
err = omap_hsmmc_prepare_data(host, req);
@@ -1722,6 +1777,8 @@ static int __init omap_hsmmc_probe(struc
mmc_host_lazy_disable(host->mmc);
+ omap_hsmmc_protect_card(host);
+
mmc_add_host(mmc);
if (mmc_slot(host).name != NULL) {
@@ -1887,6 +1944,8 @@ static int omap_hsmmc_resume(struct plat
"Unmask interrupt failed\n");
}
+ omap_hsmmc_protect_card(host);
+
/* Notify the core to resume the host */
ret = mmc_resume_host(host->mmc);
if (ret == 0)
_
Patches currently in -mm which might be from adrian.hunter@xxxxxxxxx are
mmc-register-mmci-omap-hs-using-platform_driver_probe.patch
mmc-add-enable-and-disable-methods-to-mmc-host.patch
mmc-allow-host-claim-release-nesting.patch
mmc-add-mmc_cap_nonremovable-host-capability.patch
mmc-add-ability-to-save-power-by-powering-off-cards.patch
mmc-add-mmc-card-sleep-and-awake-support.patch
mmc-power-off-once-at-removal.patch
mmc-add-host-capabilities-for-sd-only-and-mmc-only.patch
mmc-check-status-after-mmc-switch-command.patch
omap_hsmmc-add-debugfs-entry-host-registers.patch
omap_hsmmc-make-use-of-new-enable-disable-interface.patch
arm-omap-mmc-twl4030-add-context-loss-counter-support.patch
omap_hsmmc-keep-track-of-power-mode.patch
omap_hsmmc-context-save-restore-support.patch
omap_hsmmc-set-open-drain-bit-correctly.patch
omap_hsmmc-ensure-workqueues-are-empty-before-suspend.patch
omap_hsmmc-fix-scatter-gather-list-sanity-checking.patch
omap_hsmmc-make-use-of-new-mmc_cap_nonremovable-host-capability.patch
omap_hsmmc-support-for-deeper-power-saving-states.patch
arm-omap-mmc-twl4030-add-regulator-sleep-wake-function.patch
omap_hsmmc-put-mmc-regulator-to-sleep.patch
omap_hsmmc-add-mmc-card-sleep-and-awake-support.patch
omap_hsmmc-fix-null-pointer-dereference.patch
omap_hsmmc-cleanup-macro-usage.patch
omap_hsmmc-clear-interrupt-status-after-init-sequence.patch
omap_hsmmc-cater-for-weird-cmd6-behaviour.patch
omap_hsmmc-prevent-races-with-irq-handler.patch
omap_hsmmc-pass-host-capabilities-for-sd-only-and-mmc-only.patch
omap_hsmmc-code-refactoring.patch
omap_hsmmc-protect-the-card-when-the-cover-is-open.patch
omap_hsmmc-ensure-all-clock-enables-and-disables-are-paired.patch
omap_hsmmc-set-a-large-data-timeout-for-commands-with-busy-signal.patch
arm-omap-rx51-set-mmc-capabilities-and-power-saving-flag.patch
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