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mmc: core: Align to common busy polling behaviour for mmc ioctls

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Let's align to the common busy polling behaviour for mmc ioctls, by
updating the below two corresponding parts, that comes into play when using
an R1B response for a command.

*) A command with an R1B response should be prepared by calling
mmc_prepare_busy_cmd(), which make us respects the host's busy timeout
constraints.
**) When an R1B response is being used and the host also supports HW busy
detection, we should skip to poll for busy completion.

Suggested-by: Christian Loehle <cloehle@hyperstone.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Christian Loehle <cloehle@hyperstone.com>
Link: https://lore.kernel.org/r/20230213133707.27857-1-ulf.hansson@linaro.org
This commit is contained in:
Ulf Hansson 2023-02-13 14:37:07 +01:00
parent cb7f090171
commit 51f5b30567
2 changed files with 18 additions and 8 deletions
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25
drivers/mmc/core/block.c
View File

@ -470,6 +470,8 @@ static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
struct mmc_data data = {};
struct mmc_request mrq = {};
struct scatterlist sg;
bool r1b_resp, use_r1b_resp = false;
unsigned int busy_timeout_ms;
int err;
unsigned int target_part;
@ -545,6 +547,13 @@ static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
(cmd.opcode == MMC_SWITCH))
return mmc_sanitize(card, idata->ic.cmd_timeout_ms);
/* If it's an R1B response we need some more preparations. */
busy_timeout_ms = idata->ic.cmd_timeout_ms ? : MMC_BLK_TIMEOUT_MS;
r1b_resp = (cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B;
if (r1b_resp)
use_r1b_resp = mmc_prepare_busy_cmd(card->host, &cmd,
busy_timeout_ms);
mmc_wait_for_req(card->host, &mrq);
memcpy(&idata->ic.response, cmd.resp, sizeof(cmd.resp));
@ -596,14 +605,14 @@ static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
if (idata->ic.postsleep_min_us)
usleep_range(idata->ic.postsleep_min_us, idata->ic.postsleep_max_us);
if (idata->rpmb || (cmd.flags & MMC_RSP_R1B) == MMC_RSP_R1B) {
/*
* Ensure RPMB/R1B command has completed by polling CMD13 "Send Status". Here we
* allow to override the default timeout value if a custom timeout is specified.
*/
err = mmc_poll_for_busy(card, idata->ic.cmd_timeout_ms ? : MMC_BLK_TIMEOUT_MS,
false, MMC_BUSY_IO);
}
/* No need to poll when using HW busy detection. */
if ((card->host->caps & MMC_CAP_WAIT_WHILE_BUSY) && use_r1b_resp)
return 0;
/* Ensure RPMB/R1B command has completed by polling with CMD13. */
if (idata->rpmb || r1b_resp)
err = mmc_poll_for_busy(card, busy_timeout_ms, false,
MMC_BUSY_IO);
return err;
}

1
drivers/mmc/core/mmc_ops.c
View File

@ -575,6 +575,7 @@ bool mmc_prepare_busy_cmd(struct mmc_host *host, struct mmc_command *cmd,
cmd->busy_timeout = timeout_ms;
return true;
}
EXPORT_SYMBOL_GPL(mmc_prepare_busy_cmd);
/**
* __mmc_switch - modify EXT_CSD register