Commit b84daf00 authored by Phil Elwell's avatar Phil Elwell Committed by Greg Kroah-Hartman

mmc: bcm2835: Recover from MMC_SEND_EXT_CSD

[ Upstream commit 07d40576 ]

If the user issues an "mmc extcsd read", the SD controller receives
what it thinks is a SEND_IF_COND command with an unexpected data block.
The resulting operations leave the FSM stuck in READWAIT, a state which
persists until the MMC framework resets the controller, by which point
the root filesystem is likely to have been unmounted.

A less heavyweight solution is to detect the condition and nudge the
FSM by asserting the (self-clearing) FORCE_DATA_MODE bit.

Link: https://github.com/raspberrypi/linux/issues/2728Signed-off-by: default avatarPhil Elwell <phil@raspberrypi.org>
Signed-off-by: default avatarStefan Wahren <stefan.wahren@i2se.com>
Acked-by: default avatarEric Anholt <eric@anholt.net>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
parent e8041b3d
......@@ -772,6 +772,8 @@ static void bcm2835_finish_command(struct bcm2835_host *host)
if (!(sdhsts & SDHSTS_CRC7_ERROR) ||
(host->cmd->opcode != MMC_SEND_OP_COND)) {
u32 edm, fsm;
if (sdhsts & SDHSTS_CMD_TIME_OUT) {
host->cmd->error = -ETIMEDOUT;
} else {
......@@ -780,6 +782,13 @@ static void bcm2835_finish_command(struct bcm2835_host *host)
bcm2835_dumpregs(host);
host->cmd->error = -EILSEQ;
}
edm = readl(host->ioaddr + SDEDM);
fsm = edm & SDEDM_FSM_MASK;
if (fsm == SDEDM_FSM_READWAIT ||
fsm == SDEDM_FSM_WRITESTART1)
/* Kick the FSM out of its wait */
writel(edm | SDEDM_FORCE_DATA_MODE,
host->ioaddr + SDEDM);
bcm2835_finish_request(host);
return;
}
......
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