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authorAdrian Hunter <adrian.hunter@intel.com>2016-12-02 15:14:20 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-01-09 08:07:43 +0100
commit842ec27cd3f2d9d1f4a8c5900f2e41be864e9d49 (patch)
tree7ef70965396436b49b6cab00662116cdd6dd461f /drivers/mmc/host/sdhci.c
parentdae7cb41483423e2a64b128d73718b8ae5e96d2c (diff)
mmc: sdhci: Fix recovery from tuning timeout
commit 61e53bd0047d58caee0c7170613045bf96de4458 upstream. Clearing the tuning bits should reset the tuning circuit. However there is more to do. Reset the command and data lines for good measure, and then for eMMC ensure the card is not still trying to process a tuning command by sending a stop command. Note the JEDEC eMMC specification says the stop command (CMD12) can be used to stop a tuning command (CMD21) whereas the SD specification is silent on the subject with respect to the SD tuning command (CMD19). Considering that CMD12 is not a valid SDIO command, the stop command is sent only when the tuning command is CMD21 i.e. for eMMC. That addresses cases seen so far which have been on eMMC. Note that this replaces the commit fe5fb2e3b58f ("mmc: sdhci: Reset cmd and data circuits after tuning failure") which is being reverted for v4.9+. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Tested-by: Dan O'Donovan <dan@emutex.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/mmc/host/sdhci.c')
-rw-r--r--drivers/mmc/host/sdhci.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 64a428984afe..7277dfd7338f 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2040,7 +2040,27 @@ static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
ctrl &= ~SDHCI_CTRL_EXEC_TUNING;
sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
+ sdhci_do_reset(host, SDHCI_RESET_CMD);
+ sdhci_do_reset(host, SDHCI_RESET_DATA);
+
err = -EIO;
+
+ if (cmd.opcode != MMC_SEND_TUNING_BLOCK_HS200)
+ goto out;
+
+ sdhci_writel(host, host->ier, SDHCI_INT_ENABLE);
+ sdhci_writel(host, host->ier, SDHCI_SIGNAL_ENABLE);
+
+ spin_unlock_irqrestore(&host->lock, flags);
+
+ memset(&cmd, 0, sizeof(cmd));
+ cmd.opcode = MMC_STOP_TRANSMISSION;
+ cmd.flags = MMC_RSP_SPI_R1B | MMC_RSP_R1B | MMC_CMD_AC;
+ cmd.busy_timeout = 50;
+ mmc_wait_for_cmd(mmc, &cmd, 0);
+
+ spin_lock_irqsave(&host->lock, flags);
+
goto out;
}