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mmc: dw_mmc: Add RCRC handling

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This patch adds check for command response CRC failure. The driver
is currently ignoring CRC check failure on command resposes which
have CRC atteched to it, which can be potentially dangerous. Even
more grueling problem happens when the command response is followed
by data transfer though, as in that case, the dwmci_data_transfer()
function will spin until it reaches the 240s timeout.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Heiko Stuebner <heiko@sntech.de>
Cc: Philipp Tomsich <philipp.tomsich@theobroma-systems.com>
This commit is contained in:
Marek Vasut 2018-11-06 23:42:11 +01:00 committed by Tom Rini
parent fb3148a230
commit 26cc40d8c4
2 changed files with 5 additions and 0 deletions
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4
drivers/mmc/dw_mmc.c
View file

@ -317,6 +317,10 @@ static int dwmci_send_cmd(struct mmc *mmc, struct mmc_cmd *cmd,
} else if (mask & DWMCI_INTMSK_RE) {
debug("%s: Response Error.\n", __func__);
return -EIO;
} else if ((cmd->resp_type & MMC_RSP_CRC) &&
(mask & DWMCI_INTMSK_RCRC)) {
debug("%s: Response CRC Error.\n", __func__);
return -EIO;
}

1
include/dwmmc.h
View file

@ -56,6 +56,7 @@
#define DWMCI_INTMSK_DTO (1 << 3)
#define DWMCI_INTMSK_TXDR (1 << 4)
#define DWMCI_INTMSK_RXDR (1 << 5)
#define DWMCI_INTMSK_RCRC (1 << 6)
#define DWMCI_INTMSK_DCRC (1 << 7)
#define DWMCI_INTMSK_RTO (1 << 8)
#define DWMCI_INTMSK_DRTO (1 << 9)