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authorAdrian Hunter <adrian.hunter@intel.com>2014-12-05 19:25:31 +0200
committerUlf Hansson <ulf.hansson@linaro.org>2015-01-12 10:14:56 +0100
commitb5540ce1512eede3bed68ab1e9949df9ad556091 (patch)
treeb72f27bae81f9273b04769a7168db2b88e86ef8e
parent38e40bf5db9d5b8cbaeca9a78ee17f38473dd78d (diff)
mmc: sdhci: Disable re-tuning for HS400
Re-tuning for HS400 mode must be done in HS200 mode. Currently there is no support for that. That needs to be reflected in the code. Specifically, if tuning is executed in HS400 mode then return an error, and do not start the tuning timer if HS200 tuning is being done prior to switching to HS400. Note that periodic re-tuning is not expected to be needed for HS400 but re-tuning is still needed after the host controller has lost power. In the case of suspend/resume that is not necessary because the card is fully re-initialised. That just leaves runtime suspend/resume with no support for HS400 re-tuning. Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
-rw-r--r--drivers/mmc/host/sdhci.c29
-rw-r--r--include/linux/mmc/sdhci.h1
2 files changed, 30 insertions, 0 deletions
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 5c28c19622e6..398e9e496736 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1878,6 +1878,18 @@ static int sdhci_card_busy(struct mmc_host *mmc)
return !(present_state & SDHCI_DATA_LVL_MASK);
}
+static int sdhci_prepare_hs400_tuning(struct mmc_host *mmc, struct mmc_ios *ios)
+{
+ struct sdhci_host *host = mmc_priv(mmc);
+ unsigned long flags;
+
+ spin_lock_irqsave(&host->lock, flags);
+ host->flags |= SDHCI_HS400_TUNING;
+ spin_unlock_irqrestore(&host->lock, flags);
+
+ return 0;
+}
+
static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
{
struct sdhci_host *host = mmc_priv(mmc);
@@ -1886,10 +1898,14 @@ static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
int err = 0;
unsigned long flags;
unsigned int tuning_count = 0;
+ bool hs400_tuning;
sdhci_runtime_pm_get(host);
spin_lock_irqsave(&host->lock, flags);
+ hs400_tuning = host->flags & SDHCI_HS400_TUNING;
+ host->flags &= ~SDHCI_HS400_TUNING;
+
if (host->tuning_mode == SDHCI_TUNING_MODE_1)
tuning_count = host->tuning_count;
@@ -1901,8 +1917,20 @@ static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
* tuning function has to be executed.
*/
switch (host->timing) {
+ /* HS400 tuning is done in HS200 mode */
case MMC_TIMING_MMC_HS400:
+ err = -EINVAL;
+ goto out_unlock;
+
case MMC_TIMING_MMC_HS200:
+ /*
+ * Periodic re-tuning for HS400 is not expected to be needed, so
+ * disable it here.
+ */
+ if (hs400_tuning)
+ tuning_count = 0;
+ break;
+
case MMC_TIMING_UHS_SDR104:
break;
@@ -2130,6 +2158,7 @@ static const struct mmc_host_ops sdhci_ops = {
.hw_reset = sdhci_hw_reset,
.enable_sdio_irq = sdhci_enable_sdio_irq,
.start_signal_voltage_switch = sdhci_start_signal_voltage_switch,
+ .prepare_hs400_tuning = sdhci_prepare_hs400_tuning,
.execute_tuning = sdhci_execute_tuning,
.card_event = sdhci_card_event,
.card_busy = sdhci_card_busy,
diff --git a/include/linux/mmc/sdhci.h b/include/linux/mmc/sdhci.h
index 375af80bde7d..f767a0de611f 100644
--- a/include/linux/mmc/sdhci.h
+++ b/include/linux/mmc/sdhci.h
@@ -137,6 +137,7 @@ struct sdhci_host {
#define SDHCI_SDR104_NEEDS_TUNING (1<<10) /* SDR104/HS200 needs tuning */
#define SDHCI_USING_RETUNING_TIMER (1<<11) /* Host is using a retuning timer for the card */
#define SDHCI_USE_64_BIT_DMA (1<<12) /* Use 64-bit DMA */
+#define SDHCI_HS400_TUNING (1<<13) /* Tuning for HS400 */
unsigned int version; /* SDHCI spec. version */