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| author | Michael Walle <michael@walle.cc> | 2016-11-15 11:13:16 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-12-02 09:10:32 +0100 |
| commit | bdab996a7a9e1c94900bfae78c702de23a8edbc7 (patch) | |
| tree | 4020f418ad1702abbd4a3b91d24124f2b90fdede | |
| parent | 0a80bef18a9f6db0a5dc5683ed42b4c69cd587d4 (diff) | |
| download | linux-bdab996a7a9e1c94900bfae78c702de23a8edbc7.tar.gz linux-bdab996a7a9e1c94900bfae78c702de23a8edbc7.tar.bz2 linux-bdab996a7a9e1c94900bfae78c702de23a8edbc7.zip | |
mmc: sdhci-of-esdhc: fixup PRESENT_STATE read
commit b0921d5c9ed6ffa8a4d6afc5ee5f136b87445f14 upstream.
Since commit 87a18a6a5652 ("mmc: mmc: Use ->card_busy() to detect busy
cards in __mmc_switch()") the ESDHC driver is broken:
mmc0: Card stuck in programming state! __mmc_switch
mmc0: error -110 whilst initialising MMC card
Since this commit __mmc_switch() uses ->card_busy(), which is
sdhci_card_busy() for the esdhc driver. sdhci_card_busy() uses the
PRESENT_STATE register, specifically the DAT0 signal level bit. But the
ESDHC uses a non-conformant PRESENT_STATE register, thus a read fixup is
required to make the driver work again.
Signed-off-by: Michael Walle <michael@walle.cc>
Fixes: 87a18a6a5652 ("mmc: mmc: Use ->card_busy() to detect busy cards in __mmc_switch()")
Acked-by: Yangbo Lu <yangbo.lu@nxp.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/mmc/host/sdhci-of-esdhc.c | 14 | ||||
| -rw-r--r-- | drivers/mmc/host/sdhci.h | 1 |
2 files changed, 15 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci-of-esdhc.c b/drivers/mmc/host/sdhci-of-esdhc.c index 239be2fde242..2267601f0ac1 100644 --- a/drivers/mmc/host/sdhci-of-esdhc.c +++ b/drivers/mmc/host/sdhci-of-esdhc.c @@ -66,6 +66,20 @@ static u32 esdhc_readl_fixup(struct sdhci_host *host, return ret; } } + /* + * The DAT[3:0] line signal levels and the CMD line signal level are + * not compatible with standard SDHC register. The line signal levels + * DAT[7:0] are at bits 31:24 and the command line signal level is at + * bit 23. All other bits are the same as in the standard SDHC + * register. + */ + if (spec_reg == SDHCI_PRESENT_STATE) { + ret = value & 0x000fffff; + ret |= (value >> 4) & SDHCI_DATA_LVL_MASK; + ret |= (value << 1) & SDHCI_CMD_LVL; + return ret; + } + ret = value; return ret; } diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h index 0411c9f36461..1b3bd1c7f4f6 100644 --- a/drivers/mmc/host/sdhci.h +++ b/drivers/mmc/host/sdhci.h @@ -73,6 +73,7 @@ #define SDHCI_DATA_LVL_MASK 0x00F00000 #define SDHCI_DATA_LVL_SHIFT 20 #define SDHCI_DATA_0_LVL_MASK 0x00100000 +#define SDHCI_CMD_LVL 0x01000000 #define SDHCI_HOST_CONTROL 0x28 #define SDHCI_CTRL_LED 0x01 |