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author | Ulf Hansson <ulf.hansson@linaro.org> | 2020-02-04 11:54:45 +0300 |
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committer | Ulf Hansson <ulf.hansson@linaro.org> | 2020-03-24 16:35:40 +0300 |
commit | 0d84c3e6a5b2cd4ddd68b7ef7cf7c2dafd5146ef (patch) | |
tree | e723e0502b0f8407c9ff46338bb72dbd3127d2db /drivers/mmc/core/core.c | |
parent | 2a1c7cda52b7b9db50086a40654dc5c03fca866f (diff) | |
download | linux-0d84c3e6a5b2cd4ddd68b7ef7cf7c2dafd5146ef.tar.xz |
mmc: core: Convert to mmc_poll_for_busy() for erase/trim/discard
Rather than open coding the polling loop in mmc_do_erase(), let's convert
to use mmc_poll_for_busy().
To allow a slightly different error parsing during polling, compared to the
__mmc_switch() case, a new in-parameter to mmc_poll_for_busy() is needed,
but other than that the conversion is straight forward.
Besides addressing the open coding issue, moving to mmc_poll_for_busy() for
erase/trim/discard improves the behaviour according to below.
- Adds support for polling via the optional ->card_busy() host ops.
- Returns zero to indicate success when the final polling attempt finds the
card non-busy, even if the timeout expired.
- Exits the polling loop when state moves to R1_STATE_TRAN, rather than
when leaving R1_STATE_PRG.
- Decreases the starting range for throttling to 32-64us.
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Tested-by: Baolin Wang <baolin.wang7@gmail.com>
Tested-by: Ludovic Barre <ludovic.barre@st.com>
Reviewed-by: Ludovic Barre <ludovic.barre@st.com>
Link: https://lore.kernel.org/r/20200204085449.32585-9-ulf.hansson@linaro.org
Diffstat (limited to 'drivers/mmc/core/core.c')
-rw-r--r-- | drivers/mmc/core/core.c | 36 |
1 files changed, 2 insertions, 34 deletions
diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c index a971c4bcc442..3f7a31456eb4 100644 --- a/drivers/mmc/core/core.c +++ b/drivers/mmc/core/core.c @@ -1658,8 +1658,6 @@ static int mmc_do_erase(struct mmc_card *card, unsigned int from, struct mmc_command cmd = {}; unsigned int qty = 0, busy_timeout = 0; bool use_r1b_resp = false; - unsigned long timeout; - int loop_udelay=64, udelay_max=32768; int err; mmc_retune_hold(card->host); @@ -1763,38 +1761,8 @@ static int mmc_do_erase(struct mmc_card *card, unsigned int from, if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) && use_r1b_resp) goto out; - timeout = jiffies + msecs_to_jiffies(busy_timeout); - do { - memset(&cmd, 0, sizeof(struct mmc_command)); - cmd.opcode = MMC_SEND_STATUS; - cmd.arg = card->rca << 16; - cmd.flags = MMC_RSP_R1 | MMC_CMD_AC; - /* Do not retry else we can't see errors */ - err = mmc_wait_for_cmd(card->host, &cmd, 0); - if (err || R1_STATUS(cmd.resp[0])) { - pr_err("error %d requesting status %#x\n", - err, cmd.resp[0]); - err = -EIO; - goto out; - } - - /* Timeout if the device never becomes ready for data and - * never leaves the program state. - */ - if (time_after(jiffies, timeout)) { - pr_err("%s: Card stuck in programming state! %s\n", - mmc_hostname(card->host), __func__); - err = -EIO; - goto out; - } - if ((cmd.resp[0] & R1_READY_FOR_DATA) && - R1_CURRENT_STATE(cmd.resp[0]) != R1_STATE_PRG) - break; - - usleep_range(loop_udelay, loop_udelay*2); - if (loop_udelay < udelay_max) - loop_udelay *= 2; - } while (1); + /* Let's poll to find out when the erase operation completes. */ + err = mmc_poll_for_busy(card, busy_timeout, MMC_BUSY_ERASE); out: mmc_retune_release(card->host); |