mmc: core: API to temporarily disable retuning for SDIO CRC errors

Normally when the MMC core sees an "-EILSEQ" error returned by a host
controller then it will trigger a retuning of the card.  This is
generally a good idea.

However, if a command is expected to sometimes cause transfer errors
then these transfer errors shouldn't cause a re-tuning.  This
re-tuning will be a needless waste of time.  One example case where a
transfer is expected to cause errors is when transitioning between
idle (sometimes referred to as "sleep" in Broadcom code) and active
state on certain Broadcom WiFi SDIO cards.  Specifically if the card
was already transitioning between states when the command was sent it
could cause an error on the SDIO bus.

Let's add an API that the SDIO function drivers can call that will
temporarily disable the auto-tuning functionality.  Then we can add a
call to this in the Broadcom WiFi driver and any other driver that
might have similar needs.

NOTE: this makes the assumption that the card is already tuned well
enough that it's OK to disable the auto-retuning during one of these
error-prone situations.  Presumably the driver code performing the
error-prone transfer knows how to recover / retry from errors.  ...and
after we can get back to a state where transfers are no longer
error-prone then we can enable the auto-retuning again.  If we truly
find ourselves in a case where the card needs to be retuned sometimes
to handle one of these error-prone transfers then we can always try a
few transfers first without auto-retuning and then re-try with
auto-retuning if the first few fail.

Without this change on rk3288-veyron-minnie I periodically see this in
the logs of a machine just sitting there idle:
  dwmmc_rockchip ff0d0000.dwmmc: Successfully tuned phase to XYZ

Cc: stable@vger.kernel.org #v4.18+
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Kalle Valo <kvalo@codeaurora.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 6db36dc870b585d6ca19ed2e1710c34b73a59986..9020cb2490f71bd0cb3552d97514f7045a18497d 100644 (file)
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -144,8 +144,9 @@ void mmc_request_done(struct mmc_host *host, struct mmc_request *mrq)
        int err = cmd->error;
 
        /* Flag re-tuning needed on CRC errors */
-       if ((cmd->opcode != MMC_SEND_TUNING_BLOCK &&
-           cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200) &&
+       if (cmd->opcode != MMC_SEND_TUNING_BLOCK &&
+           cmd->opcode != MMC_SEND_TUNING_BLOCK_HS200 &&
+           !host->retune_crc_disable &&
            (err == -EILSEQ || (mrq->sbc && mrq->sbc->error == -EILSEQ) ||
            (mrq->data && mrq->data->error == -EILSEQ) ||
            (mrq->stop && mrq->stop->error == -EILSEQ)))

diff --git a/drivers/mmc/core/sdio_io.c b/drivers/mmc/core/sdio_io.c
index f79f0b0caab8b2516afb112880069035fe267fe1..0acb1a29c968e40c0e73f6186597e4a03e15eb4f 100644 (file)
--- a/drivers/mmc/core/sdio_io.c
+++ b/drivers/mmc/core/sdio_io.c
@@ -734,3 +734,40 @@ int sdio_set_host_pm_flags(struct sdio_func *func, mmc_pm_flag_t flags)
        return 0;
 }
 EXPORT_SYMBOL_GPL(sdio_set_host_pm_flags);
+
+/**
+ *     sdio_retune_crc_disable - temporarily disable retuning on CRC errors
+ *     @func: SDIO function attached to host
+ *
+ *     If the SDIO card is known to be in a state where it might produce
+ *     CRC errors on the bus in response to commands (like if we know it is
+ *     transitioning between power states), an SDIO function driver can
+ *     call this function to temporarily disable the SD/MMC core behavior of
+ *     triggering an automatic retuning.
+ *
+ *     This function should be called while the host is claimed and the host
+ *     should remain claimed until sdio_retune_crc_enable() is called.
+ *     Specifically, the expected sequence of calls is:
+ *     - sdio_claim_host()
+ *     - sdio_retune_crc_disable()
+ *     - some number of calls like sdio_writeb() and sdio_readb()
+ *     - sdio_retune_crc_enable()
+ *     - sdio_release_host()
+ */
+void sdio_retune_crc_disable(struct sdio_func *func)
+{
+       func->card->host->retune_crc_disable = true;
+}
+EXPORT_SYMBOL_GPL(sdio_retune_crc_disable);
+
+/**
+ *     sdio_retune_crc_enable - re-enable retuning on CRC errors
+ *     @func: SDIO function attached to host
+ *
+ *     This is the compement to sdio_retune_crc_disable().
+ */
+void sdio_retune_crc_enable(struct sdio_func *func)
+{
+       func->card->host->retune_crc_disable = false;
+}
+EXPORT_SYMBOL_GPL(sdio_retune_crc_enable);

diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h
index 43d0f0c496f661880e19a19fff8a651148442d60..ecb7972e2423baa3891cc19ea14ca0a183e8d559 100644 (file)
--- a/include/linux/mmc/host.h
+++ b/include/linux/mmc/host.h
@@ -398,6 +398,7 @@ struct mmc_host {
        unsigned int            retune_now:1;   /* do re-tuning at next req */
        unsigned int            retune_paused:1; /* re-tuning is temporarily disabled */
        unsigned int            use_blk_mq:1;   /* use blk-mq */
+       unsigned int            retune_crc_disable:1; /* don't trigger retune upon crc */
 
        int                     rescan_disable; /* disable card detection */
        int                     rescan_entered; /* used with nonremovable devices */

diff --git a/include/linux/mmc/sdio_func.h b/include/linux/mmc/sdio_func.h
index e9dfdd501cd1541dde317b60e3bf7d4fa9eb127d..4820e6d09dacefe6a7ef5d6bdd38df03d15894dc 100644 (file)
--- a/include/linux/mmc/sdio_func.h
+++ b/include/linux/mmc/sdio_func.h
@@ -167,4 +167,7 @@ extern void sdio_f0_writeb(struct sdio_func *func, unsigned char b,
 extern mmc_pm_flag_t sdio_get_host_pm_caps(struct sdio_func *func);
 extern int sdio_set_host_pm_flags(struct sdio_func *func, mmc_pm_flag_t flags);
 
+extern void sdio_retune_crc_disable(struct sdio_func *func);
+extern void sdio_retune_crc_enable(struct sdio_func *func);
+
 #endif /* LINUX_MMC_SDIO_FUNC_H */