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mmc: sdhci: don't clear SDHCI_INT_STATUS register during CMD_INHIBIT

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Fixes emmc initialization regression on the db410c platform.

Clearing this register while SDHCI_PRESENT_STATE reports
SDHCI_CMD_INHIBIT leads to undefined behaviour on the db410c.

When commit 7dde50 was merged (mmc: sdhci: Wait for SDHCI_INT_DATA_END
when transferring), SDHCI transfers transitioned to wait for bit
SDHCI_INT_DATA_END before flagging transfers done.

Without this patch, the db410 platform fails to initialize its eMMC
due to all of its transfers timing out (SDHCI_INT_DATA_END is never
raised after all the blocks have been transferred).

Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-ortiz@linaro.org>
This commit is contained in:
Jorge Ramirez-Ortiz 2017-11-02 15:10:21 +01:00 committed by Jaehoon Chung
parent 339d578900
commit 713e6815d9
1 changed files with 2 additions and 1 deletions
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3
drivers/mmc/sdhci.c
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@ -157,7 +157,6 @@ static int sdhci_send_command(struct mmc *mmc, struct mmc_cmd *cmd,
/* Timeout unit - ms */ /* Timeout unit - ms */
static unsigned int cmd_timeout = SDHCI_CMD_DEFAULT_TIMEOUT; static unsigned int cmd_timeout = SDHCI_CMD_DEFAULT_TIMEOUT;
sdhci_writel(host, SDHCI_INT_ALL_MASK, SDHCI_INT_STATUS);
mask = SDHCI_CMD_INHIBIT | SDHCI_DATA_INHIBIT; mask = SDHCI_CMD_INHIBIT | SDHCI_DATA_INHIBIT;
/* We shouldn't wait for data inihibit for stop commands, even /* We shouldn't wait for data inihibit for stop commands, even
@ -181,6 +180,8 @@ static int sdhci_send_command(struct mmc *mmc, struct mmc_cmd *cmd,
udelay(1000); udelay(1000);
} }
sdhci_writel(host, SDHCI_INT_ALL_MASK, SDHCI_INT_STATUS);
mask = SDHCI_INT_RESPONSE; mask = SDHCI_INT_RESPONSE;
if (!(cmd->resp_type & MMC_RSP_PRESENT)) if (!(cmd->resp_type & MMC_RSP_PRESENT))
flags = SDHCI_CMD_RESP_NONE; flags = SDHCI_CMD_RESP_NONE;