diff options
| author | Ulf Hansson <ulf.hansson@linaro.org> | 2014-01-14 23:17:36 +0100 |
|---|---|---|
| committer | Chris Ball <chris@printf.net> | 2014-02-23 10:40:49 -0500 |
| commit | cb962e04b04fb67dbaf1455d3c60d64297ef4933 (patch) | |
| tree | dbd9e0de9822e0a79c931d77c7db75f643da693e /drivers/mmc/core | |
| parent | 57de31f6351ecad9212a26d2112b546e4c8b4a5b (diff) | |
mmc: core: Respect host's max_busy_timeout when sending sleep cmd
When sending the sleep command for host drivers supporting
MMC_CAP_WAIT_WHILE_BUSY, we need to confirm that max_busy_timeout is
big enough comparing to the sleep timeout specified from card's
EXT_CSD. If this isn't case, we use a R1 response instead of R1B and
fallback to use a delay instead.
Do note that a max_busy_timeout set to zero by the host, is interpreted
as it can cope with whatever timeout the mmc core provides it with.
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <chris@printf.net>
Diffstat (limited to 'drivers/mmc/core')
| -rw-r--r-- | drivers/mmc/core/mmc.c | 19 |
1 files changed, 16 insertions, 3 deletions
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index 6b7ccef51beb..1ab5f3a0af5b 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -1358,6 +1358,7 @@ static int mmc_sleep(struct mmc_host *host) { struct mmc_command cmd = {0}; struct mmc_card *card = host->card; + unsigned int timeout_ms = DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000); int err; err = mmc_deselect_cards(host); @@ -1368,7 +1369,19 @@ static int mmc_sleep(struct mmc_host *host) cmd.arg = card->rca << 16; cmd.arg |= 1 << 15; - cmd.flags = MMC_RSP_R1B | MMC_CMD_AC; + /* + * If the max_busy_timeout of the host is specified, validate it against + * the sleep cmd timeout. A failure means we need to prevent the host + * from doing hw busy detection, which is done by converting to a R1 + * response instead of a R1B. + */ + if (host->max_busy_timeout && (timeout_ms > host->max_busy_timeout)) { + cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; + } else { + cmd.flags = MMC_RSP_R1B | MMC_CMD_AC; + cmd.busy_timeout = timeout_ms; + } + err = mmc_wait_for_cmd(host, &cmd, 0); if (err) return err; @@ -1379,8 +1392,8 @@ static int mmc_sleep(struct mmc_host *host) * SEND_STATUS command to poll the status because that command (and most * others) is invalid while the card sleeps. */ - if (!(host->caps & MMC_CAP_WAIT_WHILE_BUSY)) - mmc_delay(DIV_ROUND_UP(card->ext_csd.sa_timeout, 10000)); + if (!cmd.busy_timeout || !(host->caps & MMC_CAP_WAIT_WHILE_BUSY)) + mmc_delay(timeout_ms); return err; } |