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Commit 5c935165 authored by Doug Anderson's avatar Doug Anderson Committed by Ulf Hansson

mmc: dw_mmc: Add a timeout for sending CMD11

In the Designware databook's description of the "Voltage Switch Normal
Scenario" it instructs us to set a timer and fail the voltage change
if we don't see the voltage change interrupt within 2ms.  Let's
implement that.  Without implementing this I have often been able to
reproduce a hang while trying to send CMD11 on an rk3288-based board
while constantly ejecting and inserting UHS cards.
Signed-off-by: default avatarDoug Anderson <>
Signed-off-by: default avatarJaehoon Chung <>
Signed-off-by: default avatarUlf Hansson <>
parent 488b8d63
......@@ -1021,6 +1021,15 @@ static void __dw_mci_start_request(struct dw_mci *host,
dw_mci_start_command(host, cmd, cmdflags);
if (cmd->opcode == SD_SWITCH_VOLTAGE) {
* Databook says to fail after 2ms w/ no response; give an
* extra jiffy just in case we're about to roll over.
jiffies + msecs_to_jiffies(2) + 1);
if (mrq->stop)
host->stop_cmdr = dw_mci_prepare_command(slot->mmc, mrq->stop);
......@@ -2159,6 +2168,8 @@ static irqreturn_t dw_mci_interrupt(int irq, void *dev_id)
/* Check volt switch first, since it can look like an error */
if ((host->state == STATE_SENDING_CMD11) &&
(pending & SDMMC_INT_VOLT_SWITCH)) {
dw_mci_cmd_interrupt(host, pending);
......@@ -2572,6 +2583,18 @@ ciu_out:
return ret;
static void dw_mci_cmd11_timer(unsigned long arg)
struct dw_mci *host = (struct dw_mci *)arg;
if (host->state != STATE_SENDING_CMD11)
dev_info(host->dev, "Unexpected CMD11 timeout\n");
host->cmd_status = SDMMC_INT_RTO;
set_bit(EVENT_CMD_COMPLETE, &host->pending_events);
#ifdef CONFIG_OF
static struct dw_mci_of_quirks {
char *quirk;
......@@ -2746,6 +2769,9 @@ int dw_mci_probe(struct dw_mci *host)
dw_mci_cmd11_timer, (unsigned long)host);
host->quirks = host->pdata->quirks;
......@@ -202,6 +202,8 @@ struct dw_mci {
int irq;
int sdio_id0;
struct timer_list cmd11_timer;
/* DMA ops for Internal/External DMAC interface */
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