> mmc_execute_hpi should send the HPI command only
> once, only if the card is in PRG state.
>
> According to eMMC spec, the command's completion time is
> not dependent on OUT_OF_INTERRUPT_TIME. Only the transition
> out of PRG STATE is guarded by OUT_OF_INTERRUPT_TIME - which is
> defined to begin at the end of sending the command itself.
>
> Specify the default timeout for the actual sending of HPI
> command, and then use OUT_OF_INTERRUPT_TIME to wait for
> the transition out of PRG state.
>
> Reported-by: Alex Lemberg <Alex.Lemberg@xxxxxxxxxxx>
> Signed-off-by: Venkatraman S <svenkatr@xxxxxx>
> CC: Namjae Jeon <linkinjeon@xxxxxxxxx>
> CC: Jae hoon Chung <jh80.chung@xxxxxxxxx>
> CC: Chris Ball <cjb@xxxxxxxxxx>
> ---
> Changes since v1:
> Skip looping over send_status indefinitely
> Correct the interpretation of OUT_OF_INTERRUPT_TIME
>
> drivers/mmc/core/core.c | 45
> ++++++++++++++++++++++++--------------------
> drivers/mmc/core/mmc_ops.c | 2 +-
> 2 files changed, 26 insertions(+), 21 deletions(-)
>
> diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
> index e541efb..027c579 100644
> --- a/drivers/mmc/core/core.c
> +++ b/drivers/mmc/core/core.c
> @@ -403,6 +403,7 @@ int mmc_interrupt_hpi(struct mmc_card *card)
> {
> int err;
> u32 status;
> + unsigned long starttime;
>
> BUG_ON(!card);
>
> @@ -421,27 +422,31 @@ int mmc_interrupt_hpi(struct mmc_card *card)
> /*
> * If the card status is in PRG-state, we can send the HPI command.
> */
> - if (R1_CURRENT_STATE(status) == R1_STATE_PRG) {
> - do {
> - /*
> - * We don't know when the HPI command will finish
> - * processing, so we need to resend HPI until out
> - * of prg-state, and keep checking the card status
> - * with SEND_STATUS. If a timeout error occurs when
> - * sending the HPI command, we are already out of
> - * prg-state.
> - */
> - err = mmc_send_hpi_cmd(card, &status);
> - if (err)
> - pr_debug("%s: abort HPI (%d error)\n",
> - mmc_hostname(card->host), err);
> + if (R1_CURRENT_STATE(status) != R1_STATE_PRG) {
> + pr_debug("%s: Can't send HPI: Card state=%d\n",
> + mmc_hostname(card->host), R1_CURRENT_STATE(status));
> + err = -EINVAL;
> + goto out;
> + }
You can't return error here, because the card status may be:
0 = Idle 1 = Ready 2 = Ident 3 = Stby 4 = Tran 5 = Data 6 = Rcv 7 = Prg 8
= Dis 9 = Btst 10
Not every value is error here: the card state may be Idle/Ready and then
you do not need to return error.
> +
> + starttime = jiffies;
> + err = mmc_send_hpi_cmd(card, &status);
> + if (err) {
> + pr_debug("%s:HPI could not be sent.err=%d)\n",
> + mmc_hostname(card->host), err);
> + goto out;
> + }
> +
> + do {
> + err = mmc_send_status(card, &status);
> +
> + if (!err && R1_CURRENT_STATE(status) == R1_STATE_TRAN)
> + goto out;
> + if (jiffies_to_msecs(jiffies - starttime) >
> + card->ext_csd.out_of_int_time)
> + err = -ETIMEDOUT;
> + } while (!err);
>
> - err = mmc_send_status(card, &status);
> - if (err)
> - break;
> - } while (R1_CURRENT_STATE(status) == R1_STATE_PRG);
> - } else
> - pr_debug("%s: Left prg-state\n", mmc_hostname(card->host));
>
> out:
> mmc_release_host(card->host);
> diff --git a/drivers/mmc/core/mmc_ops.c b/drivers/mmc/core/mmc_ops.c
> index 69370f4..f2235d6 100644
> --- a/drivers/mmc/core/mmc_ops.c
> +++ b/drivers/mmc/core/mmc_ops.c
> @@ -569,7 +569,7 @@ int mmc_send_hpi_cmd(struct mmc_card *card, u32
> *status)
>
> cmd.opcode = opcode;
> cmd.arg = card->rca << 16 | 1;
> - cmd.cmd_timeout_ms = card->ext_csd.out_of_int_time;
> + cmd.cmd_timeout_ms = 0;
>
> err = mmc_wait_for_cmd(card->host, &cmd, 0);
> if (err) {
> --
> 1.7.10.rc2
>
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>
Thanks,
Kostya
Consultant for Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum
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