Although eMMC spec does not require a delay between tuning cycles,
some hosts need it to avoid tuning failure.
Signed-off-by: Yangbo Lu <yangbo.lu@xxxxxxxxxxxxx>
---
drivers/mmc/host/sdhci.c | 3 ++-
drivers/mmc/host/sdhci.h | 2 ++
2 files changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 9da4644..d61061b5 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -2038,7 +2038,8 @@ static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
/* eMMC spec does not require a delay between tuning cycles */
- if (opcode == MMC_SEND_TUNING_BLOCK)
+ if ((opcode == MMC_SEND_TUNING_BLOCK) ||
+ (host->quirks2 & SDHCI_QUIRK2_DELAY_BETWEEN_TUNING_CYCLES))
mdelay(1);
} while (ctrl & SDHCI_CTRL_EXEC_TUNING);
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index 98f239b..7223f96 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -412,6 +412,8 @@ struct sdhci_host {
#define SDHCI_QUIRK2_ACMD23_BROKEN (1<<14)
/* Broken Clock divider zero in controller */
#define SDHCI_QUIRK2_CLOCK_DIV_ZERO_BROKEN (1<<15)
+/* Need delay between tuning cycles */
+#define SDHCI_QUIRK2_DELAY_BETWEEN_TUNING_CYCLES (1<<16)
int irq; /* Device IRQ */
void __iomem *ioaddr; /* Mapped address */
--
2.1.0.27.g96db324
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