This patch defines a quirk for tuning work
around for some sdhci host controller. It sets
both SDHCI_CTRL_EXEC_TUNING and SDHCI_CTRL_TUNED_CLK
for tuning.
It is a preparation and will be used by Fujitsu
SDHCI controller f_sdh30 driver.
Signed-off-by: Vincent Yang <Vincent.Yang@xxxxxxxxxxxxxx>
---
drivers/mmc/host/sdhci.c | 2 ++
include/linux/mmc/sdhci.h | 2 ++
2 files changed, 4 insertions(+)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 66ad318..e245ba2 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1891,6 +1891,8 @@ static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
ctrl |= SDHCI_CTRL_EXEC_TUNING;
+ if (host->quirks2 & SDHCI_QUIRK2_TUNING_WORK_AROUND)
+ ctrl |= SDHCI_CTRL_TUNED_CLK;
sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
/*
diff --git a/include/linux/mmc/sdhci.h b/include/linux/mmc/sdhci.h
index dba793e..5a78cd6 100644
--- a/include/linux/mmc/sdhci.h
+++ b/include/linux/mmc/sdhci.h
@@ -100,6 +100,8 @@ struct sdhci_host {
#define SDHCI_QUIRK2_BROKEN_DDR50 (1<<7)
/* Stop command (CMD12) can set Transfer Complete when not using MMC_RSP_BUSY */
#define SDHCI_QUIRK2_STOP_WITH_TC (1<<8)
+/* forced tuned clock */
+#define SDHCI_QUIRK2_TUNING_WORK_AROUND (1<<9)
int irq; /* Device IRQ */
void __iomem *ioaddr; /* Mapped address */
--
1.9.0
--
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