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Code Issues Releases Activity

Handle command retries for commands originating at the mmc layer, and

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ensure that all such commands have a non-zero retry count except for those
that are expected to fail (for example, because they are used to probe for
feature support).

While it is possible to pass a retry count down to the hardware driver in
the command request structure, no hardware driver currently implements any
retry logic.  The hardware doesn't know much about the context of a single
request, so it makes more sense to handle retries at a layer that does.

This adds retry loops to the mmc_wait_for_cmd() and mmc_wait_for_app_cmd()
functions.  These functions are the gateway from other code within mmc.c
to the hardware.  App commands are a sequence of two commands and a retry
has to rerun both of them in order, so it needs its own retry loop.

Retry looping is specifically NOT implemented in mmc_wait_for_request()
because it is the gateway for children on the bus, and they have to
implement their own retry logic depending on what makes sense for them.
This commit is contained in:
Ian Lepore 2013-08-16 23:05:34 +00:00
parent 5aa60b6f21
commit a8328210d0
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=254431
1 changed files with 41 additions and 32 deletions
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73
sys/dev/mmc/mmc.c
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@ -393,8 +393,9 @@ mmc_wait_for_req(struct mmc_softc *sc, struct mmc_request *req)
while ((req->flags & MMC_REQ_DONE) == 0)
msleep(req, &sc->sc_mtx, 0, "mmcreq", 0);
MMC_UNLOCK(sc);
if (mmc_debug > 2 || (mmc_debug > 1 && req->cmd->error))
device_printf(sc->dev, "RESULT: %d\n", req->cmd->error);
if (mmc_debug > 2 || (mmc_debug > 0 && req->cmd->error != MMC_ERR_NONE))
device_printf(sc->dev, "CMD%d RESULT: %d\n",
req->cmd->opcode, req->cmd->error);
return (0);
}
@ -410,14 +411,21 @@ static int
mmc_wait_for_cmd(struct mmc_softc *sc, struct mmc_command *cmd, int retries)
{
struct mmc_request mreq;
int err;
memset(&mreq, 0, sizeof(mreq));
memset(cmd->resp, 0, sizeof(cmd->resp));
cmd->retries = retries;
cmd->mrq = &mreq;
mreq.cmd = cmd;
mmc_wait_for_req(sc, &mreq);
return (cmd->error);
do {
memset(&mreq, 0, sizeof(mreq));
memset(cmd->resp, 0, sizeof(cmd->resp));
cmd->retries = 0; /* Retries done here, not in hardware. */
cmd->mrq = &mreq;
mreq.cmd = cmd;
if (mmc_wait_for_req(sc, &mreq) != 0)
err = MMC_ERR_FAILED;
else
err = cmd->error;
} while (err != MMC_ERR_NONE && retries-- > 0);
return (err);
}
static int
@ -425,24 +433,27 @@ mmc_wait_for_app_cmd(struct mmc_softc *sc, uint32_t rca,
struct mmc_command *cmd, int retries)
{
struct mmc_command appcmd;
int err = MMC_ERR_NONE, i;
int err;
for (i = 0; i <= retries; i++) {
do {
appcmd.opcode = MMC_APP_CMD;
appcmd.arg = rca << 16;
appcmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
appcmd.data = NULL;
mmc_wait_for_cmd(sc, &appcmd, 0);
err = appcmd.error;
if (err != MMC_ERR_NONE)
continue;
if (!(appcmd.resp[0] & R1_APP_CMD))
return MMC_ERR_FAILED;
mmc_wait_for_cmd(sc, cmd, 0);
err = cmd->error;
if (err == MMC_ERR_NONE)
break;
}
if (mmc_wait_for_cmd(sc, &appcmd, 0) != 0)
err = MMC_ERR_FAILED;
else
err = appcmd.error;
if (err == MMC_ERR_NONE) {
if (!(appcmd.resp[0] & R1_APP_CMD))
return MMC_ERR_FAILED; /* Retries won't help. */
if (mmc_wait_for_cmd(sc, cmd, 0) != 0)
err = MMC_ERR_FAILED;
else
err = cmd->error;
}
} while (err != MMC_ERR_NONE && retries-- > 0);
return (err);
}
@ -461,8 +472,6 @@ mmc_wait_for_command(struct mmc_softc *sc, uint32_t opcode,
err = mmc_wait_for_cmd(sc, &cmd, retries);
if (err)
return (err);
if (cmd.error)
return (cmd.error);
if (resp) {
if (flags & MMC_RSP_136)
memcpy(resp, cmd.resp, 4 * sizeof(uint32_t));
@ -488,7 +497,7 @@ mmc_idle_cards(struct mmc_softc *sc)
cmd.arg = 0;
cmd.flags = MMC_RSP_NONE | MMC_CMD_BC;
cmd.data = NULL;
mmc_wait_for_cmd(sc, &cmd, 0);
mmc_wait_for_cmd(sc, &cmd, CMD_RETRIES);
mmc_ms_delay(1);
mmcbr_set_chip_select(dev, cs_dontcare);
@ -625,7 +634,7 @@ mmc_switch(struct mmc_softc *sc, uint8_t set, uint8_t index, uint8_t value)
set;
cmd.flags = MMC_RSP_R1B | MMC_CMD_AC;
cmd.data = NULL;
err = mmc_wait_for_cmd(sc, &cmd, 0);
err = mmc_wait_for_cmd(sc, &cmd, CMD_RETRIES);
return (err);
}
@ -1054,7 +1063,7 @@ mmc_all_send_cid(struct mmc_softc *sc, uint32_t *rawcid)
cmd.arg = 0;
cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
cmd.data = NULL;
err = mmc_wait_for_cmd(sc, &cmd, 0);
err = mmc_wait_for_cmd(sc, &cmd, CMD_RETRIES);
memcpy(rawcid, cmd.resp, 4 * sizeof(uint32_t));
return (err);
}
@ -1069,7 +1078,7 @@ mmc_send_csd(struct mmc_softc *sc, uint16_t rca, uint32_t *rawcsd)
cmd.arg = rca << 16;
cmd.flags = MMC_RSP_R2 | MMC_CMD_BCR;
cmd.data = NULL;
err = mmc_wait_for_cmd(sc, &cmd, 0);
err = mmc_wait_for_cmd(sc, &cmd, CMD_RETRIES);
memcpy(rawcsd, cmd.resp, 4 * sizeof(uint32_t));
return (err);
}
@ -1160,7 +1169,7 @@ mmc_set_relative_addr(struct mmc_softc *sc, uint16_t resp)
cmd.arg = resp << 16;
cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
cmd.data = NULL;
err = mmc_wait_for_cmd(sc, &cmd, 0);
err = mmc_wait_for_cmd(sc, &cmd, CMD_RETRIES);
return (err);
}
@ -1174,7 +1183,7 @@ mmc_send_relative_addr(struct mmc_softc *sc, uint32_t *resp)
cmd.arg = 0;
cmd.flags = MMC_RSP_R6 | MMC_CMD_BCR;
cmd.data = NULL;
err = mmc_wait_for_cmd(sc, &cmd, 0);
err = mmc_wait_for_cmd(sc, &cmd, CMD_RETRIES);
*resp = cmd.resp[0];
return (err);
}
@ -1189,7 +1198,7 @@ mmc_send_status(struct mmc_softc *sc, uint16_t rca, uint32_t *status)
cmd.arg = rca << 16;
cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
cmd.data = NULL;
err = mmc_wait_for_cmd(sc, &cmd, 0);
err = mmc_wait_for_cmd(sc, &cmd, CMD_RETRIES);
*status = cmd.resp[0];
return (err);
}
@ -1204,7 +1213,7 @@ mmc_set_blocklen(struct mmc_softc *sc, uint32_t len)
cmd.arg = len;
cmd.flags = MMC_RSP_R1 | MMC_CMD_AC;
cmd.data = NULL;
err = mmc_wait_for_cmd(sc, &cmd, 0);
err = mmc_wait_for_cmd(sc, &cmd, CMD_RETRIES);
return (err);
}