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mmc: sdhci: handle busy-end interrupt during command

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It is fully legal for a controller to start handling busy-end interrupt
before it has signaled that the command has completed. So make sure
we do things in the proper order, Or it results that command interrupt
is ignored so it can cause unexpected operations. This is founded at some
toshiba emmc with the bellow warning.

"mmc0: Got command interrupt 0x00000001 even though
no command operation was in progress."

This issue has been also reported by Youssef TRIKI:
It is not specific to Toshiba devices, and happens with eMMC devices
as well as SD card which support Auto-CMD12 rather than CMD23.

Also, similar patch is submitted by:
Gwendal Grignou <gwendal@chromium.org>

Changes since v1:
 Fixed conflict with the next of git.linaro.org/people/ulf.hansson/mmc.git
 and Tested if issue is fixed again.

Signed-off-by: Hankyung Yu <hankyung.yu@lge.com>
Signed-off-by: Chanho Min <chanho.min@lge.com>
Tested-by: Youssef TRIKI <youssef.triki@st.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Chanho Min 2014-08-30 12:40:40 +09:00 committed by Ulf Hansson
parent 0b10f478d2
commit e99783a452
2 changed files with 16 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
drivers/mmc/host/sdhci.c
View File

@ -1016,6 +1016,7 @@ void sdhci_send_command(struct sdhci_host *host, struct mmc_command *cmd)
mod_timer(&host->timer, timeout);
host->cmd = cmd;
host->busy_handle = 0;
sdhci_prepare_data(host, cmd);
@ -2261,8 +2262,12 @@ static void sdhci_cmd_irq(struct sdhci_host *host, u32 intmask)
if (host->cmd->data)
DBG("Cannot wait for busy signal when also "
"doing a data transfer");
else if (!(host->quirks & SDHCI_QUIRK_NO_BUSY_IRQ))
else if (!(host->quirks & SDHCI_QUIRK_NO_BUSY_IRQ)
&& !host->busy_handle) {
/* Mark that command complete before busy is ended */
host->busy_handle = 1;
return;
}
/* The controller does not support the end-of-busy IRQ,
* fall through and take the SDHCI_INT_RESPONSE */
@ -2330,7 +2335,15 @@ static void sdhci_data_irq(struct sdhci_host *host, u32 intmask)
return;
}
if (intmask & SDHCI_INT_DATA_END) {
sdhci_finish_command(host);
/*
* Some cards handle busy-end interrupt
* before the command completed, so make
* sure we do things in the proper order.
*/
if (host->busy_handle)
sdhci_finish_command(host);
else
host->busy_handle = 1;
return;
}
}

1
include/linux/mmc/sdhci.h
View File

@ -146,6 +146,7 @@ struct sdhci_host {
struct mmc_command *cmd; /* Current command */
struct mmc_data *data; /* Current data request */
unsigned int data_early:1; /* Data finished before cmd */
unsigned int busy_handle:1; /* Handling the order of Busy-end */
struct sg_mapping_iter sg_miter; /* SG state for PIO */
unsigned int blocks; /* remaining PIO blocks */