diff options
author | Jorg Schummer <ext-jorg.2.schummer@nokia.com> | 2009-03-31 14:51:21 (GMT) |
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committer | Pierre Ossman <pierre@ossman.eu> | 2009-06-13 20:42:56 (GMT) |
commit | 94d89efb2c347a82a08a61dbac8565b1087c3259 (patch) | |
tree | 78e4cfaec79e4ae6346635d859f4d1501dd7e0e7 /drivers/mmc | |
parent | f3ad116588151b3371ae4e092290e4f48e62b8bb (diff) | |
download | linux-fsl-qoriq-94d89efb2c347a82a08a61dbac8565b1087c3259.tar.xz |
mmc: mmc_rescan detects card change in one run
With this patch, mmc_rescan can detect the removal of an mmc card and
the insertion of (possibly another) card in the same run. This means
that a card change can be detected without having to call
mmc_detect_change multiple times.
This change generalises the core such that it can be easily used by
hosts which provide a mechanism to detect only the presence of a card
reader cover, which has to be taken off in order to insert a card. Other
hosts ("card detect" or "MMC_CAP_NEEDS_POLL") each receive an event when
a card is removed and when a card is inserted, so it is sufficient for
them if mmc_rescan handles only one event at a time. "Cover detect"
hosts, however, only receive events about the cover status. This means
that between 2 subsequent events, both a card removal and a card
insertion can occur. In this case, the pre-patch version of mmc_rescan
would only detect the removal of the previous card but not the insertion
of the new card.
Signed-off-by: Jorg Schummer <ext-jorg.2.schummer@nokia.com>
Signed-off-by: Pierre Ossman <pierre@ossman.eu>
Diffstat (limited to 'drivers/mmc')
-rw-r--r-- | drivers/mmc/core/core.c | 99 |
1 files changed, 55 insertions, 44 deletions
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index 2649117..23fb2c3 100644 --- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -855,61 +855,72 @@ void mmc_rescan(struct work_struct *work) mmc_bus_get(host); - if (host->bus_ops == NULL) { - /* - * Only we can add a new handler, so it's safe to - * release the lock here. - */ + /* if there is a card registered, check whether it is still present */ + if ((host->bus_ops != NULL) && host->bus_ops->detect && !host->bus_dead) + host->bus_ops->detect(host); + + mmc_bus_put(host); + + + mmc_bus_get(host); + + /* if there still is a card present, stop here */ + if (host->bus_ops != NULL) { mmc_bus_put(host); + goto out; + } - if (host->ops->get_cd && host->ops->get_cd(host) == 0) - goto out; + /* detect a newly inserted card */ - mmc_claim_host(host); + /* + * Only we can add a new handler, so it's safe to + * release the lock here. + */ + mmc_bus_put(host); - mmc_power_up(host); - mmc_go_idle(host); + if (host->ops->get_cd && host->ops->get_cd(host) == 0) + goto out; - mmc_send_if_cond(host, host->ocr_avail); + mmc_claim_host(host); - /* - * First we search for SDIO... - */ - err = mmc_send_io_op_cond(host, 0, &ocr); - if (!err) { - if (mmc_attach_sdio(host, ocr)) - mmc_power_off(host); - goto out; - } + mmc_power_up(host); + mmc_go_idle(host); - /* - * ...then normal SD... - */ - err = mmc_send_app_op_cond(host, 0, &ocr); - if (!err) { - if (mmc_attach_sd(host, ocr)) - mmc_power_off(host); - goto out; - } + mmc_send_if_cond(host, host->ocr_avail); - /* - * ...and finally MMC. - */ - err = mmc_send_op_cond(host, 0, &ocr); - if (!err) { - if (mmc_attach_mmc(host, ocr)) - mmc_power_off(host); - goto out; - } + /* + * First we search for SDIO... + */ + err = mmc_send_io_op_cond(host, 0, &ocr); + if (!err) { + if (mmc_attach_sdio(host, ocr)) + mmc_power_off(host); + goto out; + } - mmc_release_host(host); - mmc_power_off(host); - } else { - if (host->bus_ops->detect && !host->bus_dead) - host->bus_ops->detect(host); + /* + * ...then normal SD... + */ + err = mmc_send_app_op_cond(host, 0, &ocr); + if (!err) { + if (mmc_attach_sd(host, ocr)) + mmc_power_off(host); + goto out; + } - mmc_bus_put(host); + /* + * ...and finally MMC. + */ + err = mmc_send_op_cond(host, 0, &ocr); + if (!err) { + if (mmc_attach_mmc(host, ocr)) + mmc_power_off(host); + goto out; } + + mmc_release_host(host); + mmc_power_off(host); + out: if (host->caps & MMC_CAP_NEEDS_POLL) mmc_schedule_delayed_work(&host->detect, HZ); |