mmc: sdhci: handle busy-end interrupt during command

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>

1 files changed, 15 insertions, 2 deletions

diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index b5e22b8c4885..335cdf3b5224 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -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;
                         }
                 }